TY  - CONF
AU  - Mihajlović, Dragana R.
AU  - Rakin, Marko P.
AU  - Međo, Bojan I.
AU  - Đokić, Veljko R.
PY  - 2024
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7382
PB  - Vancouver : Peers Alley Media
C3  - 6th edition of Advanced Materials Science World Congress, Adv. Materials Science 2024, March 21-22, 2024
T1  - Microstructure, mechanical and corrosion properties of anodized ultrafine-grained titanium based materials for medical application
EP  - 40
SP  - 39
UR  - https://hdl.handle.net/21.15107/rcub_technorep_7382
ER  - 

@conference{
author = "Mihajlović, Dragana R. and Rakin, Marko P. and Međo, Bojan I. and Đokić, Veljko R.",
year = "2024",
publisher = "Vancouver : Peers Alley Media",
journal = "6th edition of Advanced Materials Science World Congress, Adv. Materials Science 2024, March 21-22, 2024",
title = "Microstructure, mechanical and corrosion properties of anodized ultrafine-grained titanium based materials for medical application",
pages = "40-39",
url = "https://hdl.handle.net/21.15107/rcub_technorep_7382"
}

Mihajlović, D. R., Rakin, M. P., Međo, B. I.,& Đokić, V. R.. (2024). Microstructure, mechanical and corrosion properties of anodized ultrafine-grained titanium based materials for medical application. in 6th edition of Advanced Materials Science World Congress, Adv. Materials Science 2024, March 21-22, 2024
Vancouver : Peers Alley Media., 39-40.
https://hdl.handle.net/21.15107/rcub_technorep_7382

Mihajlović DR, Rakin MP, Međo BI, Đokić VR. Microstructure, mechanical and corrosion properties of anodized ultrafine-grained titanium based materials for medical application. in 6th edition of Advanced Materials Science World Congress, Adv. Materials Science 2024, March 21-22, 2024. 2024;:39-40.
https://hdl.handle.net/21.15107/rcub_technorep_7382 .

Mihajlović, Dragana R., Rakin, Marko P., Međo, Bojan I., Đokić, Veljko R., "Microstructure, mechanical and corrosion properties of anodized ultrafine-grained titanium based materials for medical application" in 6th edition of Advanced Materials Science World Congress, Adv. Materials Science 2024, March 21-22, 2024 (2024):39-40,
https://hdl.handle.net/21.15107/rcub_technorep_7382 .

TY  - CHAP
AU  - Mihajlović, Dragana
AU  - Rakin, Marko
AU  - Hohenwarter, Anton
AU  - Veljović, Đorđe
AU  - Kojić, Vesna
AU  - Đokić, Veljko
PY  - 2024
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7147
AB  - Primary implant stability after implantation is in relation with its good mechanical contact with the touching tissue. Adequate integration of the implant with the bone tissue is necessary to provide safety and efficiency of the implant over its life. Generally, two surface properties are the most important facts for tissue response to the implant: the surface topography and chemical composition. Compared to a smooth implant surface, a controlled rough surface provides more surface area for integration with the surrounding tissues and allows successful implant ingrowth into the tissues. It was found that the nanostructured modification of the titanium surface on the level of nano-sized pores influences the adhesion, spreading and growing of osteoblastic cells. There are many methods for nanostructure modification of biomedical alloy surfaces, but one of the common techniques is electrochemical anodization (anodic oxidation). Electrochemical anodization is a method that leads to the creation of a nanotubular oxide film on the material surface. The advantage of anodic oxidation is the possibility of controlling the nanostructured morphology of the surface and dimensions of nanotubes, such as diameter, length, wall thickness and shape of nanotubes through variation of the solution, pH value, potential or duration of anodic oxidation. 
Surface modification of Ti-13Nb-13Zr alloy in a coarse-grained (as received) and ultrafine-grained state induced by high pressure torsion was conducted using an electrochemical anodization process in a 1 M H3PO4 + NaF electrolyte, for 30, 60, 90 and 120 minutes. Scanning electron microscopy (SEM) was used to analyze the morphology, while atomic force microscopy (AFM) was used to characterize the topography of the modified surface. The results showed that a homogenous nanotubular oxide film consisting of nanotubes could be obtained using the electrochemical anodization treatment, while the roughness of the nanostructured surface increased compared to the bare surface. The aim of the studies given in this chapter is to examine the morphology of the nanostructured surface and estimate in vitro biocompatibility of the above-mentioned titanium alloy after the creation of the nanotubular oxide film. In vitro examinations were performed on mouse fibroblast (L929) and human fibroblast (MRC-5) cell lines. The results showed that the nanotubular oxide film obtained on the coarse-grained Ti-13Nb-13Zr alloy (CG TNZ) and the ultrafine-grained Ti-13Nb-13Zr alloy (UFG TNZ) increased the fractions of surviving cells compared to their counterpart alloy, while the cells had better spreading and adhesion on the nanostructured and bare surfaces of the UFG titanium alloy.
PB  - Hoboken : John Wiley & Sons
PB  - Beverly : Scrivener Publishing LLC
T2  - Mechanical Engineering in Biomedical Application: Bio-3D Printing, Biofluid Mechanics, Implant Design, Biomaterials, Computational Biomechanics, Tissue Mechanics
T1  - The Effect of the Nanostructured Surface Modification on the Morphology and Biocompatibility of Ultrafine-Grained Titanium Alloy for Medical Application
EP  - 150
SP  - 121
DO  - 10.1002/9781394175109.ch5
UR  - https://hdl.handle.net/21.15107/rcub_technorep_7147
ER  - 

@inbook{
author = "Mihajlović, Dragana and Rakin, Marko and Hohenwarter, Anton and Veljović, Đorđe and Kojić, Vesna and Đokić, Veljko",
year = "2024",
abstract = "Primary implant stability after implantation is in relation with its good mechanical contact with the touching tissue. Adequate integration of the implant with the bone tissue is necessary to provide safety and efficiency of the implant over its life. Generally, two surface properties are the most important facts for tissue response to the implant: the surface topography and chemical composition. Compared to a smooth implant surface, a controlled rough surface provides more surface area for integration with the surrounding tissues and allows successful implant ingrowth into the tissues. It was found that the nanostructured modification of the titanium surface on the level of nano-sized pores influences the adhesion, spreading and growing of osteoblastic cells. There are many methods for nanostructure modification of biomedical alloy surfaces, but one of the common techniques is electrochemical anodization (anodic oxidation). Electrochemical anodization is a method that leads to the creation of a nanotubular oxide film on the material surface. The advantage of anodic oxidation is the possibility of controlling the nanostructured morphology of the surface and dimensions of nanotubes, such as diameter, length, wall thickness and shape of nanotubes through variation of the solution, pH value, potential or duration of anodic oxidation. 
Surface modification of Ti-13Nb-13Zr alloy in a coarse-grained (as received) and ultrafine-grained state induced by high pressure torsion was conducted using an electrochemical anodization process in a 1 M H3PO4 + NaF electrolyte, for 30, 60, 90 and 120 minutes. Scanning electron microscopy (SEM) was used to analyze the morphology, while atomic force microscopy (AFM) was used to characterize the topography of the modified surface. The results showed that a homogenous nanotubular oxide film consisting of nanotubes could be obtained using the electrochemical anodization treatment, while the roughness of the nanostructured surface increased compared to the bare surface. The aim of the studies given in this chapter is to examine the morphology of the nanostructured surface and estimate in vitro biocompatibility of the above-mentioned titanium alloy after the creation of the nanotubular oxide film. In vitro examinations were performed on mouse fibroblast (L929) and human fibroblast (MRC-5) cell lines. The results showed that the nanotubular oxide film obtained on the coarse-grained Ti-13Nb-13Zr alloy (CG TNZ) and the ultrafine-grained Ti-13Nb-13Zr alloy (UFG TNZ) increased the fractions of surviving cells compared to their counterpart alloy, while the cells had better spreading and adhesion on the nanostructured and bare surfaces of the UFG titanium alloy.",
publisher = "Hoboken : John Wiley & Sons, Beverly : Scrivener Publishing LLC",
journal = "Mechanical Engineering in Biomedical Application: Bio-3D Printing, Biofluid Mechanics, Implant Design, Biomaterials, Computational Biomechanics, Tissue Mechanics",
booktitle = "The Effect of the Nanostructured Surface Modification on the Morphology and Biocompatibility of Ultrafine-Grained Titanium Alloy for Medical Application",
pages = "150-121",
doi = "10.1002/9781394175109.ch5",
url = "https://hdl.handle.net/21.15107/rcub_technorep_7147"
}

Mihajlović, D., Rakin, M., Hohenwarter, A., Veljović, Đ., Kojić, V.,& Đokić, V.. (2024). The Effect of the Nanostructured Surface Modification on the Morphology and Biocompatibility of Ultrafine-Grained Titanium Alloy for Medical Application. in Mechanical Engineering in Biomedical Application: Bio-3D Printing, Biofluid Mechanics, Implant Design, Biomaterials, Computational Biomechanics, Tissue Mechanics
Hoboken : John Wiley & Sons., 121-150.
https://doi.org/10.1002/9781394175109.ch5
https://hdl.handle.net/21.15107/rcub_technorep_7147

Mihajlović D, Rakin M, Hohenwarter A, Veljović Đ, Kojić V, Đokić V. The Effect of the Nanostructured Surface Modification on the Morphology and Biocompatibility of Ultrafine-Grained Titanium Alloy for Medical Application. in Mechanical Engineering in Biomedical Application: Bio-3D Printing, Biofluid Mechanics, Implant Design, Biomaterials, Computational Biomechanics, Tissue Mechanics. 2024;:121-150.
doi:10.1002/9781394175109.ch5
https://hdl.handle.net/21.15107/rcub_technorep_7147 .

Mihajlović, Dragana, Rakin, Marko, Hohenwarter, Anton, Veljović, Đorđe, Kojić, Vesna, Đokić, Veljko, "The Effect of the Nanostructured Surface Modification on the Morphology and Biocompatibility of Ultrafine-Grained Titanium Alloy for Medical Application" in Mechanical Engineering in Biomedical Application: Bio-3D Printing, Biofluid Mechanics, Implant Design, Biomaterials, Computational Biomechanics, Tissue Mechanics (2024):121-150,
https://doi.org/10.1002/9781394175109.ch5 .,
https://hdl.handle.net/21.15107/rcub_technorep_7147 .

TY  - CONF
AU  - Rakin, Marko
AU  - Mihajlović, Dragana
AU  - Međo, Bojan
AU  - Đokić, Veljko
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6294
AB  - The Ti-13Nb-13Zr alloy made by conventional methods (coarse-grained, CG) was examined, as well as the alloy and commercially pure titanium (cpTi) after the high pressure torsion (HPT) process (ultrafine-grained, UFG) performed at room temperature. All materials were subjected to nanostructured surface modification. Nanostructured surface modification was done in 1M H3PO4 + 0.5 wt. % NaF electrolyte during 60 and 90 minutes, for the desired potential of 25V with a scan rate of 100 mVs-1. As the result of the nanostructured surface modification nanotubular titanium based oxide layer was obtained.
Scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to characterize the homogeneity of nanotubular titanium based oxide layer and dimensions of the formed nanotubes. In order to define the chemical structure of oxide layer, energy dispersive spectroscopy (EDS) was used. The obtained results indicate that the duration of the nanostructured surface modification significantly affects on the homogeneity of the nanotubular titanium based oxide layer morphology, as well as on the dimensions of the nanotubes (diameter and wall thickness of the nanotubes). Also, the effect of the HPT process on the homogeneity and thickness of the nanotubular oxide layer (length of the nanotubes) are shown and discussed.
The mechanical behavior of nanotubular titanium based oxide layer was examined by nanoindentation test. The control of nanoindentation test was done by total displacement. The displacements were 2000 nm for non-modified surface and 10% of the thickness of nanotubular titanium based oxide layer for modified surface. The test was performed on a nanoindenter using as an indenter the Berkovich-type diamond tip. As results, loading-displacement curves and the mean value of ten measurements of the surface modulus of elasticity and nanohardness were obtained. Also, in order to characterize deformation of the oxide layer after nanoindentation SEM was done. Having in mind that nanotubular oxide thin layer can affect tensile properties of metallic materials, tensile testing was performed.
PB  - InovSciTech No. 302, Uttarahalli, Bangalore-560061, India
C3  - 6th Global Webinar on Materials Science & Engineering (GWMSE-2023), The International Research Conference
T1  - Structural and mechanical behavior of titanium based oxide thin layer for biomedical application
EP  - 15
SP  - 14
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6294
ER  - 

@conference{
author = "Rakin, Marko and Mihajlović, Dragana and Međo, Bojan and Đokić, Veljko",
year = "2023",
abstract = "The Ti-13Nb-13Zr alloy made by conventional methods (coarse-grained, CG) was examined, as well as the alloy and commercially pure titanium (cpTi) after the high pressure torsion (HPT) process (ultrafine-grained, UFG) performed at room temperature. All materials were subjected to nanostructured surface modification. Nanostructured surface modification was done in 1M H3PO4 + 0.5 wt. % NaF electrolyte during 60 and 90 minutes, for the desired potential of 25V with a scan rate of 100 mVs-1. As the result of the nanostructured surface modification nanotubular titanium based oxide layer was obtained.
Scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to characterize the homogeneity of nanotubular titanium based oxide layer and dimensions of the formed nanotubes. In order to define the chemical structure of oxide layer, energy dispersive spectroscopy (EDS) was used. The obtained results indicate that the duration of the nanostructured surface modification significantly affects on the homogeneity of the nanotubular titanium based oxide layer morphology, as well as on the dimensions of the nanotubes (diameter and wall thickness of the nanotubes). Also, the effect of the HPT process on the homogeneity and thickness of the nanotubular oxide layer (length of the nanotubes) are shown and discussed.
The mechanical behavior of nanotubular titanium based oxide layer was examined by nanoindentation test. The control of nanoindentation test was done by total displacement. The displacements were 2000 nm for non-modified surface and 10% of the thickness of nanotubular titanium based oxide layer for modified surface. The test was performed on a nanoindenter using as an indenter the Berkovich-type diamond tip. As results, loading-displacement curves and the mean value of ten measurements of the surface modulus of elasticity and nanohardness were obtained. Also, in order to characterize deformation of the oxide layer after nanoindentation SEM was done. Having in mind that nanotubular oxide thin layer can affect tensile properties of metallic materials, tensile testing was performed.",
publisher = "InovSciTech No. 302, Uttarahalli, Bangalore-560061, India",
journal = "6th Global Webinar on Materials Science & Engineering (GWMSE-2023), The International Research Conference",
title = "Structural and mechanical behavior of titanium based oxide thin layer for biomedical application",
pages = "15-14",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6294"
}

Rakin, M., Mihajlović, D., Međo, B.,& Đokić, V.. (2023). Structural and mechanical behavior of titanium based oxide thin layer for biomedical application. in 6th Global Webinar on Materials Science & Engineering (GWMSE-2023), The International Research Conference
InovSciTech No. 302, Uttarahalli, Bangalore-560061, India., 14-15.
https://hdl.handle.net/21.15107/rcub_technorep_6294

Rakin M, Mihajlović D, Međo B, Đokić V. Structural and mechanical behavior of titanium based oxide thin layer for biomedical application. in 6th Global Webinar on Materials Science & Engineering (GWMSE-2023), The International Research Conference. 2023;:14-15.
https://hdl.handle.net/21.15107/rcub_technorep_6294 .

Rakin, Marko, Mihajlović, Dragana, Međo, Bojan, Đokić, Veljko, "Structural and mechanical behavior of titanium based oxide thin layer for biomedical application" in 6th Global Webinar on Materials Science & Engineering (GWMSE-2023), The International Research Conference (2023):14-15,
https://hdl.handle.net/21.15107/rcub_technorep_6294 .

TY  - CONF
AU  - Mihajlović, Dragana
AU  - Rakin, Marko
AU  - Veljović, Đorđe
AU  - Međo, Bojan
AU  - Đokić, Veljko
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7011
AB  - The coarse-grained (CG) and ultrafine-grained (UFG) Ti-13Nb-13Zr alloy (TNZ) were used as tested materials in this
study. UFG alloy was obtained using a high-pressure torsion process (HPT) at room temperature, with 5 rotations, and
with 4.1 GPa pressure. After that, the surface was modified using electrochemical anodization in the 1M H3PO4 + NaF
electrolyte, for 60 and 90 minutes.
Scanning electron microscopy (SEM) was used to characterize the morphology of the modified surface after
electrochemical anodization. In order to determine whether the electrochemical anodization leads to obtaining the
surface modulus of elasticity values close to the values characteristic of the human bones, a nanoindentation test was
done. The nanoindentation test was performed on the device called nanoindenter G200, Agilent Technologies, where
a diamond tip of the Berkovich type shaped as a three-sided pyramid was used as an indenter. Control of
the nanoindentation test was done by nanoindentation depth, where for non-anodized materials a depth of 2000 nm was
used, while for anodized materials a minimum value of 10% of the thickness of the formed nanostructured oxide layer
was used. Biocompatibility of the tested titanium alloy was estimated by the tetrazolium salt colorimetric test
(MTT test) using mouse fibroblasts (L-929) and human lung fibroblasts (MRC-5). The cell adhesion on the alloy
surface was analyzed using SEM.
Electrochemical anodization has led to the formation of the nanostructured oxide layer on the titanium alloy surface.
The obtained results show the existence of the influence of anodizing time on the nanostructured oxide layer
morphology. Characterization of the titanium alloy surface using nanoindentation showed a decrease in the values
of modulus of elasticity for an alloy with a nanostructured oxide layer, which is close to the values of bone tissue in
the human body. The results of the MTT test showed that the titanium alloys before and after electrochemical
anodization were not cytotoxic. After electrochemical anodization, a uniform nanostructured surface, with nanotubes,
was formed which led to better cell viability and adhesion of L-929 and MRC-5 cells in contact with the test alloys than
of cells in contact with the control material.
PB  - Belgrade : Association of Metallurgical Engineers of Serbia (AMES)
C3  - Book of Abstracts / 5th Metallurgical & Materials Engineering Congress of SouthEast Europe MME SEE Congress 2023, Trebinje, Bosnia and Herzegovina 7-10th June 2023
T1  - Advancement of biocompatibility and mechanical surface characteristics of the Ti-13Nb-13Zr alloy using electrochemical anodization
SP  - 56
UR  - https://hdl.handle.net/21.15107/rcub_technorep_7011
ER  - 

@conference{
author = "Mihajlović, Dragana and Rakin, Marko and Veljović, Đorđe and Međo, Bojan and Đokić, Veljko",
year = "2023",
abstract = "The coarse-grained (CG) and ultrafine-grained (UFG) Ti-13Nb-13Zr alloy (TNZ) were used as tested materials in this
study. UFG alloy was obtained using a high-pressure torsion process (HPT) at room temperature, with 5 rotations, and
with 4.1 GPa pressure. After that, the surface was modified using electrochemical anodization in the 1M H3PO4 + NaF
electrolyte, for 60 and 90 minutes.
Scanning electron microscopy (SEM) was used to characterize the morphology of the modified surface after
electrochemical anodization. In order to determine whether the electrochemical anodization leads to obtaining the
surface modulus of elasticity values close to the values characteristic of the human bones, a nanoindentation test was
done. The nanoindentation test was performed on the device called nanoindenter G200, Agilent Technologies, where
a diamond tip of the Berkovich type shaped as a three-sided pyramid was used as an indenter. Control of
the nanoindentation test was done by nanoindentation depth, where for non-anodized materials a depth of 2000 nm was
used, while for anodized materials a minimum value of 10% of the thickness of the formed nanostructured oxide layer
was used. Biocompatibility of the tested titanium alloy was estimated by the tetrazolium salt colorimetric test
(MTT test) using mouse fibroblasts (L-929) and human lung fibroblasts (MRC-5). The cell adhesion on the alloy
surface was analyzed using SEM.
Electrochemical anodization has led to the formation of the nanostructured oxide layer on the titanium alloy surface.
The obtained results show the existence of the influence of anodizing time on the nanostructured oxide layer
morphology. Characterization of the titanium alloy surface using nanoindentation showed a decrease in the values
of modulus of elasticity for an alloy with a nanostructured oxide layer, which is close to the values of bone tissue in
the human body. The results of the MTT test showed that the titanium alloys before and after electrochemical
anodization were not cytotoxic. After electrochemical anodization, a uniform nanostructured surface, with nanotubes,
was formed which led to better cell viability and adhesion of L-929 and MRC-5 cells in contact with the test alloys than
of cells in contact with the control material.",
publisher = "Belgrade : Association of Metallurgical Engineers of Serbia (AMES)",
journal = "Book of Abstracts / 5th Metallurgical & Materials Engineering Congress of SouthEast Europe MME SEE Congress 2023, Trebinje, Bosnia and Herzegovina 7-10th June 2023",
title = "Advancement of biocompatibility and mechanical surface characteristics of the Ti-13Nb-13Zr alloy using electrochemical anodization",
pages = "56",
url = "https://hdl.handle.net/21.15107/rcub_technorep_7011"
}

Mihajlović, D., Rakin, M., Veljović, Đ., Međo, B.,& Đokić, V.. (2023). Advancement of biocompatibility and mechanical surface characteristics of the Ti-13Nb-13Zr alloy using electrochemical anodization. in Book of Abstracts / 5th Metallurgical & Materials Engineering Congress of SouthEast Europe MME SEE Congress 2023, Trebinje, Bosnia and Herzegovina 7-10th June 2023
Belgrade : Association of Metallurgical Engineers of Serbia (AMES)., 56.
https://hdl.handle.net/21.15107/rcub_technorep_7011

Mihajlović D, Rakin M, Veljović Đ, Međo B, Đokić V. Advancement of biocompatibility and mechanical surface characteristics of the Ti-13Nb-13Zr alloy using electrochemical anodization. in Book of Abstracts / 5th Metallurgical & Materials Engineering Congress of SouthEast Europe MME SEE Congress 2023, Trebinje, Bosnia and Herzegovina 7-10th June 2023. 2023;:56.
https://hdl.handle.net/21.15107/rcub_technorep_7011 .

Mihajlović, Dragana, Rakin, Marko, Veljović, Đorđe, Međo, Bojan, Đokić, Veljko, "Advancement of biocompatibility and mechanical surface characteristics of the Ti-13Nb-13Zr alloy using electrochemical anodization" in Book of Abstracts / 5th Metallurgical & Materials Engineering Congress of SouthEast Europe MME SEE Congress 2023, Trebinje, Bosnia and Herzegovina 7-10th June 2023 (2023):56,
https://hdl.handle.net/21.15107/rcub_technorep_7011 .

TY  - JOUR
AU  - Mihajlović, Dragana
AU  - Rakin, Marko
AU  - Bajat, Jelena
AU  - Đokić, Veljko
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6975
AB  - Nanostructured surface modification was performed on the ultrafine-grained commercially
pure titanium (UFG cpTi) using electrochemical anodization. The characterization of the
morphology of the nanostructured surface obtained during different times of electrochemical
anodization was done using scanning electron microscopy (SEM). The corrosion resistance
of the materials was examined using the potentiodynamic method and electrochemical
impedance spectroscopy (EIS), during which the electrochemical characteristics of oxide
layers and the evaluation of the corrosion resistance of the mentioned materials were
determined. These materials were exposed to a solution simulating conditions in the human
body (artificial saliva solution) with a pH of 5.5 at a temperature of 37 ºC. The obtained results
indicate the extensive influence of time, as a parameter of electrochemical anodization on the
surface morphology. The electrochemical anodization of 60 minutes can lead to the creation
of the nanotubular oxide layer on the UFG cpTi surface, while the electrochemical anodization
of 30 and 90 minutes did not lead to the creation of the nanotubular oxide layer, but it is up
to the surface modification of UFG cpTi. Electrochemical tests showed a slight increase in the
corrosion resistance in a solution of artificial saliva after electrochemical anodization. Also,
the electrochemical impedance spectra for anodized and non-anodized UFG cpTi show the
characteristics of corrosion resistance, but the anodized UFG cpTi has better resistance to the
oxide layer. It can be concluded that anodized UFG cpTi has better corrosion stability, but
both non-anodized and anodized UFG cpTi show exceptional corrosion stability in simulated
conditions of the human body, which makes them equally suitable for use in medicine.
PB  - Association of Metallurgical Engineers of Serbia
T2  - Metallurgical and Materials Data. Advanced Functional Materials
T1  - Corrosion Stability of the Anodized Ultrafine-Grained Titanium in the Human Body Solution
EP  - 11
IS  - 1
SP  - 7
VL  - 1
DO  - 10.56801/MMD3
ER  - 

@article{
author = "Mihajlović, Dragana and Rakin, Marko and Bajat, Jelena and Đokić, Veljko",
year = "2023",
abstract = "Nanostructured surface modification was performed on the ultrafine-grained commercially
pure titanium (UFG cpTi) using electrochemical anodization. The characterization of the
morphology of the nanostructured surface obtained during different times of electrochemical
anodization was done using scanning electron microscopy (SEM). The corrosion resistance
of the materials was examined using the potentiodynamic method and electrochemical
impedance spectroscopy (EIS), during which the electrochemical characteristics of oxide
layers and the evaluation of the corrosion resistance of the mentioned materials were
determined. These materials were exposed to a solution simulating conditions in the human
body (artificial saliva solution) with a pH of 5.5 at a temperature of 37 ºC. The obtained results
indicate the extensive influence of time, as a parameter of electrochemical anodization on the
surface morphology. The electrochemical anodization of 60 minutes can lead to the creation
of the nanotubular oxide layer on the UFG cpTi surface, while the electrochemical anodization
of 30 and 90 minutes did not lead to the creation of the nanotubular oxide layer, but it is up
to the surface modification of UFG cpTi. Electrochemical tests showed a slight increase in the
corrosion resistance in a solution of artificial saliva after electrochemical anodization. Also,
the electrochemical impedance spectra for anodized and non-anodized UFG cpTi show the
characteristics of corrosion resistance, but the anodized UFG cpTi has better resistance to the
oxide layer. It can be concluded that anodized UFG cpTi has better corrosion stability, but
both non-anodized and anodized UFG cpTi show exceptional corrosion stability in simulated
conditions of the human body, which makes them equally suitable for use in medicine.",
publisher = "Association of Metallurgical Engineers of Serbia",
journal = "Metallurgical and Materials Data. Advanced Functional Materials",
title = "Corrosion Stability of the Anodized Ultrafine-Grained Titanium in the Human Body Solution",
pages = "11-7",
number = "1",
volume = "1",
doi = "10.56801/MMD3"
}

Mihajlović, D., Rakin, M., Bajat, J.,& Đokić, V.. (2023). Corrosion Stability of the Anodized Ultrafine-Grained Titanium in the Human Body Solution. in Metallurgical and Materials Data. Advanced Functional Materials
Association of Metallurgical Engineers of Serbia., 1(1), 7-11.
https://doi.org/10.56801/MMD3

Mihajlović D, Rakin M, Bajat J, Đokić V. Corrosion Stability of the Anodized Ultrafine-Grained Titanium in the Human Body Solution. in Metallurgical and Materials Data. Advanced Functional Materials. 2023;1(1):7-11.
doi:10.56801/MMD3 .

Mihajlović, Dragana, Rakin, Marko, Bajat, Jelena, Đokić, Veljko, "Corrosion Stability of the Anodized Ultrafine-Grained Titanium in the Human Body Solution" in Metallurgical and Materials Data. Advanced Functional Materials, 1, no. 1 (2023):7-11,
https://doi.org/10.56801/MMD3 . .

TY  - CONF
AU  - Mihajlović, Dragana R.
AU  - Rakin, Marko P.
AU  - Bajat, Jelena B.
AU  - Međo, Bojan I.
AU  - Đokić, Veljko R.
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6974
AB  - Titanium-based nanotubelayer was formed through the electrochemical anodization technique on
coarse-grained and ultrafine-grained Ti-13Nb-13Zr (wt.%) alloy, in 1M H3PO4 + NaF electrolyte
for 90 minutes. The nanotube layer morphology was analyzed using the scanning electron
microscopy (SEM) and the X-ray diffraction (XRD). The electrochemical impedance spectroscopy (EIS) technique was used to determine the corrosion resistance of the alloy before and after
electrochemical anodization. These materials were exposed to a solution simulating conditions in
the human body (Ringer'
s solution) with pH of 5.5 at a temperature of 37 ºC. In order to investigate
the titanium-based nanotube layer adhesion on alloy surface a scratch test was done. The scratch
test was performedon nanoindenter G200, Agilent Technologies, using an indenter Berkovichtype diamond tip with applying an increasing load up to 40 mN. It was established that electrochemical anodization led to the formation of the nanotube oxide layer on the surface of titaniumbased materials. Influence of the ultrafine-grained material structure on the homogeneity of the
nanotube layer obtained by electrochemical anodization has been noticed. Both coarse-grained
and ultrafine-grained alloy showed excellent corrosion resistance in Ringer’s solution. Moreover,
electrochemical anodization led to a decrease or an increase of the corrosion resistance of these
materials, depending on the nanotube layer morphology. The scratch test showed that plastic
deformation was present in the nanotube layer. The scratch resistance for the nanotube layer
failure was on the higher load, pointing to the good adhesion for the titanium-based nanotube layer
formed using electrochemical anodization.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and The Book of Abstracts / Twenty-fourth Annual Conference YUCOMAT 2023, Herceg Novi, Montenegro, September 4 - 8, 2023
T1  - Corrosion and scratch resistance of the nanotube layer formed on the titanium-based materials
SP  - 171
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6974
ER  - 

@conference{
author = "Mihajlović, Dragana R. and Rakin, Marko P. and Bajat, Jelena B. and Međo, Bojan I. and Đokić, Veljko R.",
year = "2023",
abstract = "Titanium-based nanotubelayer was formed through the electrochemical anodization technique on
coarse-grained and ultrafine-grained Ti-13Nb-13Zr (wt.%) alloy, in 1M H3PO4 + NaF electrolyte
for 90 minutes. The nanotube layer morphology was analyzed using the scanning electron
microscopy (SEM) and the X-ray diffraction (XRD). The electrochemical impedance spectroscopy (EIS) technique was used to determine the corrosion resistance of the alloy before and after
electrochemical anodization. These materials were exposed to a solution simulating conditions in
the human body (Ringer'
s solution) with pH of 5.5 at a temperature of 37 ºC. In order to investigate
the titanium-based nanotube layer adhesion on alloy surface a scratch test was done. The scratch
test was performedon nanoindenter G200, Agilent Technologies, using an indenter Berkovichtype diamond tip with applying an increasing load up to 40 mN. It was established that electrochemical anodization led to the formation of the nanotube oxide layer on the surface of titaniumbased materials. Influence of the ultrafine-grained material structure on the homogeneity of the
nanotube layer obtained by electrochemical anodization has been noticed. Both coarse-grained
and ultrafine-grained alloy showed excellent corrosion resistance in Ringer’s solution. Moreover,
electrochemical anodization led to a decrease or an increase of the corrosion resistance of these
materials, depending on the nanotube layer morphology. The scratch test showed that plastic
deformation was present in the nanotube layer. The scratch resistance for the nanotube layer
failure was on the higher load, pointing to the good adhesion for the titanium-based nanotube layer
formed using electrochemical anodization.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and The Book of Abstracts / Twenty-fourth Annual Conference YUCOMAT 2023, Herceg Novi, Montenegro, September 4 - 8, 2023",
title = "Corrosion and scratch resistance of the nanotube layer formed on the titanium-based materials",
pages = "171",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6974"
}

Mihajlović, D. R., Rakin, M. P., Bajat, J. B., Međo, B. I.,& Đokić, V. R.. (2023). Corrosion and scratch resistance of the nanotube layer formed on the titanium-based materials. in Programme and The Book of Abstracts / Twenty-fourth Annual Conference YUCOMAT 2023, Herceg Novi, Montenegro, September 4 - 8, 2023
Belgrade : Materials Research Society of Serbia., 171.
https://hdl.handle.net/21.15107/rcub_technorep_6974

Mihajlović DR, Rakin MP, Bajat JB, Međo BI, Đokić VR. Corrosion and scratch resistance of the nanotube layer formed on the titanium-based materials. in Programme and The Book of Abstracts / Twenty-fourth Annual Conference YUCOMAT 2023, Herceg Novi, Montenegro, September 4 - 8, 2023. 2023;:171.
https://hdl.handle.net/21.15107/rcub_technorep_6974 .

Mihajlović, Dragana R., Rakin, Marko P., Bajat, Jelena B., Međo, Bojan I., Đokić, Veljko R., "Corrosion and scratch resistance of the nanotube layer formed on the titanium-based materials" in Programme and The Book of Abstracts / Twenty-fourth Annual Conference YUCOMAT 2023, Herceg Novi, Montenegro, September 4 - 8, 2023 (2023):171,
https://hdl.handle.net/21.15107/rcub_technorep_6974 .

TY  - CONF
AU  - Mihajlović, Dragana
AU  - Međo, Bojan
AU  - Đokić, Veljko
AU  - Bajat, Jelena
AU  - Rakin, Marko
AU  - Putić, Slaviša
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7172
AB  - Intenzivno plastično deformisanje (IPD, eng. Severe Plastic Deformation, SPD)  jesu različiti savremeni postupci čiji je osnovni cilj dobijanje sitnozrne strukture (eng. ultrafine-grained, UFG) metalnih materijala. Sitnozrni metalni materijali najčešće pokazuju poboljšana mehanička svojstva u odnosu na metalne materijale dobijene konvencionalnim postupcima izrade, dok je koroziona otpornost ovih materijala još uvek nedovoljno ispitana. Jedna od metoda intenzivnog plastičnog deformisanja je i metoda uvijanja pod visokim pritiskom (UVP, eng. High Pressure Torsion, HPT). U cilju ispitivanja uticaja nanostrukturne modifikacije površine na svojstva sitnozrnog komercijalnog čistog titana (korozionu postojanost, površinski modul elastičnosti i tvrdoću) u radu je urađena elektrohemijska anodizacija. Karakterizacija površinske modifikovane strukture kod sitnozrnog komercijalnog čistog titana urađena je primenom skenirajuće elektronske mikroskopije (eng. Scanning Electron Microscopy, SEM). Homogenost materijala nakon UVP postupka procenjen je merenjem mikrotvrdoće duž prečnika uzoraka primenom metode po Vikersu (eng. Vickers). Otpornost prema koroziji sitnozrnog komercijalnog čistog titana pre i posle elektrohemijske andizacije ispitana je primenom potenciodinamičke metode, pri čemu je pokazano povećanje korozione otpornosti u simuliranom rastvoru ljudskog organizma. Karakterizacija površine sitnozrnog komercijalnog čistog titana primenom nanoindentacije pokazala je smanjenje vrednosti površinskog modula elastičnosti i tvrdoće kod materijala sa nanostrukturnim oksidnim slojem, koje su bliže vrednostima koštanog tkiva u ljudskom organizmu.
AB  - Severe Plastic Deformation (SPD) are modern procedures whose main goal is to obtain an
ultrafine-grained structure of metallic materials. Ultrafine-grained metallic materials show
improved mechanical properties compared to metallic materials obtained by conventional
manufacturing methods, while the corrosion resistance of these materials is still insufficiently
tested. One of the methods of Severe Plastic Deformation is the method of High Pressure
Torsion (HPT). In order to examine the influence of nanostructural surface modification on
the properties of ultrafine-grained commercially pure titanium (corrosion resistance, surface
modulus of elasticity and hardness), electrochemical anodization was performed. The
characterization of the surface modified structure of ultrafine-grained commercially pure
titanium was performed using Scanning Electron Microscopy (SEM). The homogeneity of
the material after the HPT procedure was assessed by measuring the microhardness along the
diameter of the samples using the Vickers method. Corrosion resistance of ultrafine-grained
commercially pure titanium before and after electrochemical andization was tested using the
potentiodynamic method, where an increase corrosion resistance in a simulated solution of
the human organism was demonstrated. The characterization of the surface of the comercially
pure titanium using nanoindentation showed a decrease in the values of the surface modulus
of elasticity and hardness for titanium with a nanostructured oxide layer, which are closer to
the values of bone tissue in the human body.
PB  - Požarevac : Savez društava inženjera i tehničara grada Požarevca
PB  - Požarevac : Društvo hemičara, tehnologa i metalurga
C3  - Zbornik radova / Savetovanje "Novi materijali i mogućnosti njihove primene", Požarevac, 2023 godine
T1  - Uticaj nanostrukturne modifikacije površine na svojstva komercijalno čistog titana za primenu u medicini
T1  - The influence of nanostructure surface modification on the properties of commercially pure titanium for application in medicine
EP  - 60
SP  - 51
UR  - https://hdl.handle.net/21.15107/rcub_technorep_7172
ER  - 

@conference{
author = "Mihajlović, Dragana and Međo, Bojan and Đokić, Veljko and Bajat, Jelena and Rakin, Marko and Putić, Slaviša",
year = "2023",
abstract = "Intenzivno plastično deformisanje (IPD, eng. Severe Plastic Deformation, SPD)  jesu različiti savremeni postupci čiji je osnovni cilj dobijanje sitnozrne strukture (eng. ultrafine-grained, UFG) metalnih materijala. Sitnozrni metalni materijali najčešće pokazuju poboljšana mehanička svojstva u odnosu na metalne materijale dobijene konvencionalnim postupcima izrade, dok je koroziona otpornost ovih materijala još uvek nedovoljno ispitana. Jedna od metoda intenzivnog plastičnog deformisanja je i metoda uvijanja pod visokim pritiskom (UVP, eng. High Pressure Torsion, HPT). U cilju ispitivanja uticaja nanostrukturne modifikacije površine na svojstva sitnozrnog komercijalnog čistog titana (korozionu postojanost, površinski modul elastičnosti i tvrdoću) u radu je urađena elektrohemijska anodizacija. Karakterizacija površinske modifikovane strukture kod sitnozrnog komercijalnog čistog titana urađena je primenom skenirajuće elektronske mikroskopije (eng. Scanning Electron Microscopy, SEM). Homogenost materijala nakon UVP postupka procenjen je merenjem mikrotvrdoće duž prečnika uzoraka primenom metode po Vikersu (eng. Vickers). Otpornost prema koroziji sitnozrnog komercijalnog čistog titana pre i posle elektrohemijske andizacije ispitana je primenom potenciodinamičke metode, pri čemu je pokazano povećanje korozione otpornosti u simuliranom rastvoru ljudskog organizma. Karakterizacija površine sitnozrnog komercijalnog čistog titana primenom nanoindentacije pokazala je smanjenje vrednosti površinskog modula elastičnosti i tvrdoće kod materijala sa nanostrukturnim oksidnim slojem, koje su bliže vrednostima koštanog tkiva u ljudskom organizmu., Severe Plastic Deformation (SPD) are modern procedures whose main goal is to obtain an
ultrafine-grained structure of metallic materials. Ultrafine-grained metallic materials show
improved mechanical properties compared to metallic materials obtained by conventional
manufacturing methods, while the corrosion resistance of these materials is still insufficiently
tested. One of the methods of Severe Plastic Deformation is the method of High Pressure
Torsion (HPT). In order to examine the influence of nanostructural surface modification on
the properties of ultrafine-grained commercially pure titanium (corrosion resistance, surface
modulus of elasticity and hardness), electrochemical anodization was performed. The
characterization of the surface modified structure of ultrafine-grained commercially pure
titanium was performed using Scanning Electron Microscopy (SEM). The homogeneity of
the material after the HPT procedure was assessed by measuring the microhardness along the
diameter of the samples using the Vickers method. Corrosion resistance of ultrafine-grained
commercially pure titanium before and after electrochemical andization was tested using the
potentiodynamic method, where an increase corrosion resistance in a simulated solution of
the human organism was demonstrated. The characterization of the surface of the comercially
pure titanium using nanoindentation showed a decrease in the values of the surface modulus
of elasticity and hardness for titanium with a nanostructured oxide layer, which are closer to
the values of bone tissue in the human body.",
publisher = "Požarevac : Savez društava inženjera i tehničara grada Požarevca, Požarevac : Društvo hemičara, tehnologa i metalurga",
journal = "Zbornik radova / Savetovanje "Novi materijali i mogućnosti njihove primene", Požarevac, 2023 godine",
title = "Uticaj nanostrukturne modifikacije površine na svojstva komercijalno čistog titana za primenu u medicini, The influence of nanostructure surface modification on the properties of commercially pure titanium for application in medicine",
pages = "60-51",
url = "https://hdl.handle.net/21.15107/rcub_technorep_7172"
}

Mihajlović, D., Međo, B., Đokić, V., Bajat, J., Rakin, M.,& Putić, S.. (2023). Uticaj nanostrukturne modifikacije površine na svojstva komercijalno čistog titana za primenu u medicini. in Zbornik radova / Savetovanje "Novi materijali i mogućnosti njihove primene", Požarevac, 2023 godine
Požarevac : Savez društava inženjera i tehničara grada Požarevca., 51-60.
https://hdl.handle.net/21.15107/rcub_technorep_7172

Mihajlović D, Međo B, Đokić V, Bajat J, Rakin M, Putić S. Uticaj nanostrukturne modifikacije površine na svojstva komercijalno čistog titana za primenu u medicini. in Zbornik radova / Savetovanje "Novi materijali i mogućnosti njihove primene", Požarevac, 2023 godine. 2023;:51-60.
https://hdl.handle.net/21.15107/rcub_technorep_7172 .

Mihajlović, Dragana, Međo, Bojan, Đokić, Veljko, Bajat, Jelena, Rakin, Marko, Putić, Slaviša, "Uticaj nanostrukturne modifikacije površine na svojstva komercijalno čistog titana za primenu u medicini" in Zbornik radova / Savetovanje "Novi materijali i mogućnosti njihove primene", Požarevac, 2023 godine (2023):51-60,
https://hdl.handle.net/21.15107/rcub_technorep_7172 .

TY  - CONF
AU  - Barjaktarević, Dragana R.
AU  - Rakin, Marko P.
AU  - Međo, Bojan I.
AU  - Radosavljević, Zoran M.
AU  - Đokić, Veljko R.
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6018
AB  - Titanium alloys are metal materials widely used in medicine owing to their suitable characteristics such as low density, good corrosion resistance and biocompatibillity. High biocompatibility of the titanium alloy results from the creation of a spontaneous oxide layer with good adhesion and homogeneous morphology. In order to improve characteristics of the metallic materials for application in medicine, electrochemical methods that enable surface nanostructured modification are extensively used, and one of these methods is electrochemical anodization which makes it possible to obtain a nanostructured oxide layer composed of nanotubes on the surface of the metal material. The tested material was ultrafine-grained Ti-13Nb-13Zr (UFG TNZ) alloy obtained by the severe plastic deformation (SPD) processing using the high pressure torsion (HPT) process. Nanostructured oxide layer on the titanium alloy was formed by electrochemical anodization during the time period from 30 to 120 minutes. Characterization of the surface morphology obtained during different times of electrochemical anodization was done using scanning electron microscopy (SEM), while the topography and surface roughness of the titanium alloy before and after electrochemical anodization was determined using atomic force microscopy (AFM). Scratch test was used to determine the cross profile of the surface topography and critical load during scratching. Electrochemical anodization led to the formation of a nanostructured oxide layer on the surface of the titanium alloy. The obtained results indicated strong influence of the electrochemical anodization time on the oxide layer morphology - with its increase the diameter of the nanotubes increases too, while the wall thickness of nanotubes decreases. Also, electrochemical anodization led to an increase in the surface roughness.
PB  - Novi Sad : Faculty of Technology
C3  - Proceedings of the 2nd International Conference on Advanced Production and Processing ICAPP 2022, Novi Sad
T1  - THE SURFACE CHARACTERIZATION OF THE ANODIZED ULTRAFINE-GRAINED Ti-13Nb-13Zr ALLOY
EP  - 114
SP  - 105
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6018
ER  - 

@conference{
author = "Barjaktarević, Dragana R. and Rakin, Marko P. and Međo, Bojan I. and Radosavljević, Zoran M. and Đokić, Veljko R.",
year = "2023",
abstract = "Titanium alloys are metal materials widely used in medicine owing to their suitable characteristics such as low density, good corrosion resistance and biocompatibillity. High biocompatibility of the titanium alloy results from the creation of a spontaneous oxide layer with good adhesion and homogeneous morphology. In order to improve characteristics of the metallic materials for application in medicine, electrochemical methods that enable surface nanostructured modification are extensively used, and one of these methods is electrochemical anodization which makes it possible to obtain a nanostructured oxide layer composed of nanotubes on the surface of the metal material. The tested material was ultrafine-grained Ti-13Nb-13Zr (UFG TNZ) alloy obtained by the severe plastic deformation (SPD) processing using the high pressure torsion (HPT) process. Nanostructured oxide layer on the titanium alloy was formed by electrochemical anodization during the time period from 30 to 120 minutes. Characterization of the surface morphology obtained during different times of electrochemical anodization was done using scanning electron microscopy (SEM), while the topography and surface roughness of the titanium alloy before and after electrochemical anodization was determined using atomic force microscopy (AFM). Scratch test was used to determine the cross profile of the surface topography and critical load during scratching. Electrochemical anodization led to the formation of a nanostructured oxide layer on the surface of the titanium alloy. The obtained results indicated strong influence of the electrochemical anodization time on the oxide layer morphology - with its increase the diameter of the nanotubes increases too, while the wall thickness of nanotubes decreases. Also, electrochemical anodization led to an increase in the surface roughness.",
publisher = "Novi Sad : Faculty of Technology",
journal = "Proceedings of the 2nd International Conference on Advanced Production and Processing ICAPP 2022, Novi Sad",
title = "THE SURFACE CHARACTERIZATION OF THE ANODIZED ULTRAFINE-GRAINED Ti-13Nb-13Zr ALLOY",
pages = "114-105",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6018"
}

Barjaktarević, D. R., Rakin, M. P., Međo, B. I., Radosavljević, Z. M.,& Đokić, V. R.. (2023). THE SURFACE CHARACTERIZATION OF THE ANODIZED ULTRAFINE-GRAINED Ti-13Nb-13Zr ALLOY. in Proceedings of the 2nd International Conference on Advanced Production and Processing ICAPP 2022, Novi Sad
Novi Sad : Faculty of Technology., 105-114.
https://hdl.handle.net/21.15107/rcub_technorep_6018

Barjaktarević DR, Rakin MP, Međo BI, Radosavljević ZM, Đokić VR. THE SURFACE CHARACTERIZATION OF THE ANODIZED ULTRAFINE-GRAINED Ti-13Nb-13Zr ALLOY. in Proceedings of the 2nd International Conference on Advanced Production and Processing ICAPP 2022, Novi Sad. 2023;:105-114.
https://hdl.handle.net/21.15107/rcub_technorep_6018 .

Barjaktarević, Dragana R., Rakin, Marko P., Međo, Bojan I., Radosavljević, Zoran M., Đokić, Veljko R., "THE SURFACE CHARACTERIZATION OF THE ANODIZED ULTRAFINE-GRAINED Ti-13Nb-13Zr ALLOY" in Proceedings of the 2nd International Conference on Advanced Production and Processing ICAPP 2022, Novi Sad (2023):105-114,
https://hdl.handle.net/21.15107/rcub_technorep_6018 .

TY  - CONF
AU  - Rakin, Marko
AU  - Barjaktarević, Dragana
AU  - Međo, Bojan
AU  - Đokić, Veljko
AU  - Gubeljak, Nenad
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6012
AB  - The intent of the study was to modify virgin biomedical Ti-13Nb-13Zr alloy in aim to realize whether applied modifications could improve mechanical properties. Two groups of modifications were applied to the prepared samples: structural modification achieved by severe plastic deformation (SPD) and modification of alloy surface obtained by electrochemical method. Structural modification was performed by using high pressure torsion (HPT) as one of the SPD methods. Pressure of 4.1 GPa was applied and up to 5 rotations were made at room temperature. After HPT treatment an ultrafine-grained (UFG) structure was obtained. The homogeneity of the UFG alloy was checked by using Vickers microhardness tester. Electrochemical anodization was done in the 1M H3PO4 + NaF electrolyte during 90 minutes, resulting in formation of an oxide layer on the alloy surface. Surface roughness was determined using an atomic force microscope. Tensile properties of the alloy before and after electrochemical anodization and HPT processing were determined. The scanning electron microscopy was used to characterize both morphology of anodized surfaces and the fracture surfaces after the tensile tests. 
The HPT treated alloy has higher values of tensile strength and modulus of elasticity and lower value of plasticity than the virgin alloy. Surface modification of virgin alloy leads to a decrease of these values compared to non-treated samples and practically has no influence on tensile properties on the UFG alloy. Mechanical properties of the surface – modulus of elasticity and nanohardness were determined using a nanoindentation test. The surfaces of anodized alloys (both virgin and HPT treated) have lower modulus of elasticity than surfaces of non-anodized ones.
C3  - 4th Virtual Congress on Materials Science & Engineering
T1  - Mechanical characterization of surface modified Ti-based alloy before and after severe plastic deformation
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6012
ER  - 

@conference{
author = "Rakin, Marko and Barjaktarević, Dragana and Međo, Bojan and Đokić, Veljko and Gubeljak, Nenad",
year = "2022",
abstract = "The intent of the study was to modify virgin biomedical Ti-13Nb-13Zr alloy in aim to realize whether applied modifications could improve mechanical properties. Two groups of modifications were applied to the prepared samples: structural modification achieved by severe plastic deformation (SPD) and modification of alloy surface obtained by electrochemical method. Structural modification was performed by using high pressure torsion (HPT) as one of the SPD methods. Pressure of 4.1 GPa was applied and up to 5 rotations were made at room temperature. After HPT treatment an ultrafine-grained (UFG) structure was obtained. The homogeneity of the UFG alloy was checked by using Vickers microhardness tester. Electrochemical anodization was done in the 1M H3PO4 + NaF electrolyte during 90 minutes, resulting in formation of an oxide layer on the alloy surface. Surface roughness was determined using an atomic force microscope. Tensile properties of the alloy before and after electrochemical anodization and HPT processing were determined. The scanning electron microscopy was used to characterize both morphology of anodized surfaces and the fracture surfaces after the tensile tests. 
The HPT treated alloy has higher values of tensile strength and modulus of elasticity and lower value of plasticity than the virgin alloy. Surface modification of virgin alloy leads to a decrease of these values compared to non-treated samples and practically has no influence on tensile properties on the UFG alloy. Mechanical properties of the surface – modulus of elasticity and nanohardness were determined using a nanoindentation test. The surfaces of anodized alloys (both virgin and HPT treated) have lower modulus of elasticity than surfaces of non-anodized ones.",
journal = "4th Virtual Congress on Materials Science & Engineering",
title = "Mechanical characterization of surface modified Ti-based alloy before and after severe plastic deformation",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6012"
}

Rakin, M., Barjaktarević, D., Međo, B., Đokić, V.,& Gubeljak, N.. (2022). Mechanical characterization of surface modified Ti-based alloy before and after severe plastic deformation. in 4th Virtual Congress on Materials Science & Engineering.
https://hdl.handle.net/21.15107/rcub_technorep_6012

Rakin M, Barjaktarević D, Međo B, Đokić V, Gubeljak N. Mechanical characterization of surface modified Ti-based alloy before and after severe plastic deformation. in 4th Virtual Congress on Materials Science & Engineering. 2022;.
https://hdl.handle.net/21.15107/rcub_technorep_6012 .

Rakin, Marko, Barjaktarević, Dragana, Međo, Bojan, Đokić, Veljko, Gubeljak, Nenad, "Mechanical characterization of surface modified Ti-based alloy before and after severe plastic deformation" in 4th Virtual Congress on Materials Science & Engineering (2022),
https://hdl.handle.net/21.15107/rcub_technorep_6012 .

TY  - CONF
AU  - Barjaktarević, Dragana
AU  - Rakin, Marko
AU  - Veljović, Đorđe
AU  - Međo, Bojan
AU  - Đokić, Veljko
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5258
AB  - Nanostructured surface of Ti-13Nb-13Zr alloy (coarse-grained (CG), and ultrafine-grained (UFG), obtained by high pressure torsion - HPT) was formed using electrochemical anodization in the 1M H3PO4 + NaF electrolyte, during 30, 60, 90 and 120 minutes. The scanning electron microscopy (SEM) was used to characterise the morphology of the surface, while chemical characterization of the obtained nanostructured surface was performed using energy dispersive spectroscopy (EDS). The surface modulus of elasticity and hardness before and after the surface nanostructure modification, was examined using the nanoindentation test, while the analysis of deformation and damage of the nanostructured surface after nanoindentation was performed using SEM. Cytotoxicity of the tested alloys and cell culture viability were assessed using the tetrazolium salt colorimetric test (MTT test) using mouse fibroblasts (L-929) and human lung fibroblasts (MRC-5) in liquid medium. Morphology and adhesion of cells on the surface were analysed using SEM. The obtained results indicate the strong influence of time, as a parameter of anodization, on the surface morphology. Influence of the HPT processing on the homogeneity of the nanostructured surface obtained by electrochemical anodization has also been shown. The alloys before and after the surface nanostructure modification are adequate in their biocompatibility for use in the implantology. Characterization of the titanium-based materials surface using nanoindentation showed a decrease in the values of modulus of elasticity and hardness for materials with nanostructured surface, which are close to the values of bone tissue in the human body.
PB  - Materials Research Society of Srebia
C3  - Twenty-third Annual Conference YUCOMAT 2022 &
Twelfth World Round Table Conference on Sintering XII WRTCS
T1  - Nanostructured surface modification and characterization of titanium based materials for medical application
SP  - 154
UR  - https://hdl.handle.net/21.15107/rcub_technorep_5258
ER  - 

@conference{
author = "Barjaktarević, Dragana and Rakin, Marko and Veljović, Đorđe and Međo, Bojan and Đokić, Veljko",
year = "2022",
abstract = "Nanostructured surface of Ti-13Nb-13Zr alloy (coarse-grained (CG), and ultrafine-grained (UFG), obtained by high pressure torsion - HPT) was formed using electrochemical anodization in the 1M H3PO4 + NaF electrolyte, during 30, 60, 90 and 120 minutes. The scanning electron microscopy (SEM) was used to characterise the morphology of the surface, while chemical characterization of the obtained nanostructured surface was performed using energy dispersive spectroscopy (EDS). The surface modulus of elasticity and hardness before and after the surface nanostructure modification, was examined using the nanoindentation test, while the analysis of deformation and damage of the nanostructured surface after nanoindentation was performed using SEM. Cytotoxicity of the tested alloys and cell culture viability were assessed using the tetrazolium salt colorimetric test (MTT test) using mouse fibroblasts (L-929) and human lung fibroblasts (MRC-5) in liquid medium. Morphology and adhesion of cells on the surface were analysed using SEM. The obtained results indicate the strong influence of time, as a parameter of anodization, on the surface morphology. Influence of the HPT processing on the homogeneity of the nanostructured surface obtained by electrochemical anodization has also been shown. The alloys before and after the surface nanostructure modification are adequate in their biocompatibility for use in the implantology. Characterization of the titanium-based materials surface using nanoindentation showed a decrease in the values of modulus of elasticity and hardness for materials with nanostructured surface, which are close to the values of bone tissue in the human body.",
publisher = "Materials Research Society of Srebia",
journal = "Twenty-third Annual Conference YUCOMAT 2022 &
Twelfth World Round Table Conference on Sintering XII WRTCS",
title = "Nanostructured surface modification and characterization of titanium based materials for medical application",
pages = "154",
url = "https://hdl.handle.net/21.15107/rcub_technorep_5258"
}

Barjaktarević, D., Rakin, M., Veljović, Đ., Međo, B.,& Đokić, V.. (2022). Nanostructured surface modification and characterization of titanium based materials for medical application. in Twenty-third Annual Conference YUCOMAT 2022 &
Twelfth World Round Table Conference on Sintering XII WRTCS
Materials Research Society of Srebia., 154.
https://hdl.handle.net/21.15107/rcub_technorep_5258

Barjaktarević D, Rakin M, Veljović Đ, Međo B, Đokić V. Nanostructured surface modification and characterization of titanium based materials for medical application. in Twenty-third Annual Conference YUCOMAT 2022 &
Twelfth World Round Table Conference on Sintering XII WRTCS. 2022;:154.
https://hdl.handle.net/21.15107/rcub_technorep_5258 .

Barjaktarević, Dragana, Rakin, Marko, Veljović, Đorđe, Međo, Bojan, Đokić, Veljko, "Nanostructured surface modification and characterization of titanium based materials for medical application" in Twenty-third Annual Conference YUCOMAT 2022 &
Twelfth World Round Table Conference on Sintering XII WRTCS (2022):154,
https://hdl.handle.net/21.15107/rcub_technorep_5258 .

TY  - CONF
AU  - Rakin, Marko
AU  - Barjaktarević, Dragana
AU  - Đokić, Veljko
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6178
C3  - Virtual Event: Global Summit on Future of Materials Science and Research
T1  - Nanostructured surface modification of coarse-grained and ultrafine-grained Ti-13Nb-13Zr alloy for biomedical application.
EP  - 30
SP  - 29
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6178
ER  - 

@conference{
author = "Rakin, Marko and Barjaktarević, Dragana and Đokić, Veljko",
year = "2021",
journal = "Virtual Event: Global Summit on Future of Materials Science and Research",
title = "Nanostructured surface modification of coarse-grained and ultrafine-grained Ti-13Nb-13Zr alloy for biomedical application.",
pages = "30-29",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6178"
}

Rakin, M., Barjaktarević, D.,& Đokić, V.. (2021). Nanostructured surface modification of coarse-grained and ultrafine-grained Ti-13Nb-13Zr alloy for biomedical application.. in Virtual Event: Global Summit on Future of Materials Science and Research, 29-30.
https://hdl.handle.net/21.15107/rcub_technorep_6178

Rakin M, Barjaktarević D, Đokić V. Nanostructured surface modification of coarse-grained and ultrafine-grained Ti-13Nb-13Zr alloy for biomedical application.. in Virtual Event: Global Summit on Future of Materials Science and Research. 2021;:29-30.
https://hdl.handle.net/21.15107/rcub_technorep_6178 .

Rakin, Marko, Barjaktarević, Dragana, Đokić, Veljko, "Nanostructured surface modification of coarse-grained and ultrafine-grained Ti-13Nb-13Zr alloy for biomedical application." in Virtual Event: Global Summit on Future of Materials Science and Research (2021):29-30,
https://hdl.handle.net/21.15107/rcub_technorep_6178 .

TY  - THES
AU  - Barjaktarević, Dragana
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5260
AB  - Ponašanje metalnih biomaterijala odreĊeno je u velikoj meri karakteristikama njihove površine,
koje predstavljaju jedan od kljuĉnih faktora u interakcijama implanta sa okolnim tkivom. Za
optimizaciju i poboljšanje biokompatibilnih i mehaniĉkih svojstava implanata ĉesto je neophodna
modifikacija površine. Ovakve metode, poznate kao površinski tretmani ili modifikacije, mogu se
podeliti u ĉetiri grupe: mehaniĉke, fiziĉke, hemijske i biološke površinske modifikacije. U hemijske
površinske modifikacije ubrajaju se hemijske metode, elektrohemijske metode, sol-gel metode i
hemijska depozicija iz parne faze. U poslednjoj deceniji, elektrohemijske metode koje omogućavaju
površinsku nanostrukturnu modifikaciju sve više nalaze svoju primenu u izradi implanata, a jedna
od ovih metoda je i elektrohemijska anodizacija (anodna oksidacija), koja na površini metalnog
materijala omogućava dobijanje nanostrukturnog oksidnog sloja sastavljenog od nanotuba. Prednost
elektrohemijske anodizacije u odnosu na druge metode površinske nanostrukturne modifikacije
jeste mogućnost kontrole morfologije nanostrukturnih oksidnih slojeva i veliĉine nanotuba
paţljivim odabirom elektrolita, pH vrednosti, napona ili vremena elektrohemijske anodizacije.
Detaljni pregled literature pokazuje da nanostrukturna površina kod metalnih materijala na bazi
titana moţe biti formirana primenom elektrohemijske anodizacije, ali ostaje otvoreno pitanje kakva
je morfologija na sitnozrnim metalnim materijalima dobijenim postupkom uvijanja pod visokim
pritiskom (UVP, eng. High pressure torsion, HPT), kao i da li i u kojoj meri površinska
nanostrukturna modifikacija materijala na bazi titana utiĉe na površinski modul elastiĉnosti,
tvrdoću, korozionu otpornost, biokompatibilnost i zatezna svojstva materijala. Iz tog razloga, u ovoj
doktorskoj disertaciji je ispitan stepen korozione otpornosti i biokompatibilnosti materijala u sredini
koja simulira uslove prisutne u ljudskom organizmu kako bi se došlo do zakljuĉka da li materijali
nakon UVP postupka i nakon površinske nanostrukturne modifikacije, dovode do poboljšanih
karakteristika u odnosu na materijale dobijene konvencionalnim postupcima izrade. Ispitan je
površinski modul elastiĉnosti i tvrdoća kako bi se došlo do zakljuĉka da li površinska
nanostrukturna modifikacija dovodi do pribliţavanja njihovih vrednosti vrednostima modula
elastiĉnosti i tvrdoće kostiju u ljudskom organizmu, a analiziran je i uticaj površinske
nanostrukturne modifikacije na zatezna svojstva biomaterijala...
PB  - Univerzitet u Beogradu, Tehnološko-metalurški fakultet
T2  - https://nardus.mpn.gov.rs/handle/123456789/20618
T1  - Površinska nanostrukturna modifikacija i karakterizacija materijala na bazi titana za primenu u medicini
UR  - https://hdl.handle.net/21.15107/rcub_technorep_5260
ER  - 

@phdthesis{
author = "Barjaktarević, Dragana",
year = "2021",
abstract = "Ponašanje metalnih biomaterijala odreĊeno je u velikoj meri karakteristikama njihove površine,
koje predstavljaju jedan od kljuĉnih faktora u interakcijama implanta sa okolnim tkivom. Za
optimizaciju i poboljšanje biokompatibilnih i mehaniĉkih svojstava implanata ĉesto je neophodna
modifikacija površine. Ovakve metode, poznate kao površinski tretmani ili modifikacije, mogu se
podeliti u ĉetiri grupe: mehaniĉke, fiziĉke, hemijske i biološke površinske modifikacije. U hemijske
površinske modifikacije ubrajaju se hemijske metode, elektrohemijske metode, sol-gel metode i
hemijska depozicija iz parne faze. U poslednjoj deceniji, elektrohemijske metode koje omogućavaju
površinsku nanostrukturnu modifikaciju sve više nalaze svoju primenu u izradi implanata, a jedna
od ovih metoda je i elektrohemijska anodizacija (anodna oksidacija), koja na površini metalnog
materijala omogućava dobijanje nanostrukturnog oksidnog sloja sastavljenog od nanotuba. Prednost
elektrohemijske anodizacije u odnosu na druge metode površinske nanostrukturne modifikacije
jeste mogućnost kontrole morfologije nanostrukturnih oksidnih slojeva i veliĉine nanotuba
paţljivim odabirom elektrolita, pH vrednosti, napona ili vremena elektrohemijske anodizacije.
Detaljni pregled literature pokazuje da nanostrukturna površina kod metalnih materijala na bazi
titana moţe biti formirana primenom elektrohemijske anodizacije, ali ostaje otvoreno pitanje kakva
je morfologija na sitnozrnim metalnim materijalima dobijenim postupkom uvijanja pod visokim
pritiskom (UVP, eng. High pressure torsion, HPT), kao i da li i u kojoj meri površinska
nanostrukturna modifikacija materijala na bazi titana utiĉe na površinski modul elastiĉnosti,
tvrdoću, korozionu otpornost, biokompatibilnost i zatezna svojstva materijala. Iz tog razloga, u ovoj
doktorskoj disertaciji je ispitan stepen korozione otpornosti i biokompatibilnosti materijala u sredini
koja simulira uslove prisutne u ljudskom organizmu kako bi se došlo do zakljuĉka da li materijali
nakon UVP postupka i nakon površinske nanostrukturne modifikacije, dovode do poboljšanih
karakteristika u odnosu na materijale dobijene konvencionalnim postupcima izrade. Ispitan je
površinski modul elastiĉnosti i tvrdoća kako bi se došlo do zakljuĉka da li površinska
nanostrukturna modifikacija dovodi do pribliţavanja njihovih vrednosti vrednostima modula
elastiĉnosti i tvrdoće kostiju u ljudskom organizmu, a analiziran je i uticaj površinske
nanostrukturne modifikacije na zatezna svojstva biomaterijala...",
publisher = "Univerzitet u Beogradu, Tehnološko-metalurški fakultet",
journal = "https://nardus.mpn.gov.rs/handle/123456789/20618",
title = "Površinska nanostrukturna modifikacija i karakterizacija materijala na bazi titana za primenu u medicini",
url = "https://hdl.handle.net/21.15107/rcub_technorep_5260"
}

Barjaktarević, D.. (2021). Površinska nanostrukturna modifikacija i karakterizacija materijala na bazi titana za primenu u medicini. in https://nardus.mpn.gov.rs/handle/123456789/20618
Univerzitet u Beogradu, Tehnološko-metalurški fakultet..
https://hdl.handle.net/21.15107/rcub_technorep_5260

Barjaktarević D. Površinska nanostrukturna modifikacija i karakterizacija materijala na bazi titana za primenu u medicini. in https://nardus.mpn.gov.rs/handle/123456789/20618. 2021;.
https://hdl.handle.net/21.15107/rcub_technorep_5260 .

Barjaktarević, Dragana, "Površinska nanostrukturna modifikacija i karakterizacija materijala na bazi titana za primenu u medicini" in https://nardus.mpn.gov.rs/handle/123456789/20618 (2021),
https://hdl.handle.net/21.15107/rcub_technorep_5260 .

TY  - CHAP
AU  - Barjaktarević, Dragana
AU  - Međo, Bojan
AU  - Đokić, Veljko
AU  - Rakin, Marko
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5252
AB  - Lower value of modulus of elasticity, closer to that of a bone, is one of the crucial surface properties in accepting the implant material from the surrounding tissue, and reduces the possibility of slow disappearance of bone in contact with the implant. In the present study, ultrafine-grained (UFG) Ti-13Nb-13Zr alloy was obtained using high pressure torsion process (HPT) under a pressure of 4.1 GPa with a rotational speed of 0.2 rpm up to 5 rotations at room temperature. Nanostructured surface on coarse-grained (CG) and UFG Ti-13Nb-13Zr alloy was formed using electrochemical anodization in the 1M H3PO4 + NaF electrolyte, during 60 and 90 minutes. Scanning electron microscopy (SEM) was used to characterise the morphology of the surface, while nanomechanical properties of the surface, modulus of elasticity and nanohardness were determined using the nanoindentation test. Also, in order to characterise deformation of the nanotubes after nanoindentation test, SEM was done. It was shown that the nanotubular oxide layer was formed as result of the electrochemical anodization process during both anodizing times. The surface of anodized alloys has lower modulus of elasticity than surface of non-anodized ones. Anodized UFG alloy had the lowest modulus of elasticity of the surface when compared to other tested samples, which makes it more acceptable for biomedical usage.
PB  - Springer
T2  - Proceedings of the International Conference
of Experimental and Numerical Investigations
and New Technologies
T1  - Morphology and nanomechanical properties of the ultrafine-grained Ti-13Nb-13Zr alloy surface obtained using electrochemical anodization
EP  - 141
SP  - 123
VL  - 323
DO  - 10.1007/978-3-030-86009-7_7
ER  - 

@inbook{
author = "Barjaktarević, Dragana and Međo, Bojan and Đokić, Veljko and Rakin, Marko",
year = "2021",
abstract = "Lower value of modulus of elasticity, closer to that of a bone, is one of the crucial surface properties in accepting the implant material from the surrounding tissue, and reduces the possibility of slow disappearance of bone in contact with the implant. In the present study, ultrafine-grained (UFG) Ti-13Nb-13Zr alloy was obtained using high pressure torsion process (HPT) under a pressure of 4.1 GPa with a rotational speed of 0.2 rpm up to 5 rotations at room temperature. Nanostructured surface on coarse-grained (CG) and UFG Ti-13Nb-13Zr alloy was formed using electrochemical anodization in the 1M H3PO4 + NaF electrolyte, during 60 and 90 minutes. Scanning electron microscopy (SEM) was used to characterise the morphology of the surface, while nanomechanical properties of the surface, modulus of elasticity and nanohardness were determined using the nanoindentation test. Also, in order to characterise deformation of the nanotubes after nanoindentation test, SEM was done. It was shown that the nanotubular oxide layer was formed as result of the electrochemical anodization process during both anodizing times. The surface of anodized alloys has lower modulus of elasticity than surface of non-anodized ones. Anodized UFG alloy had the lowest modulus of elasticity of the surface when compared to other tested samples, which makes it more acceptable for biomedical usage.",
publisher = "Springer",
journal = "Proceedings of the International Conference
of Experimental and Numerical Investigations
and New Technologies",
booktitle = "Morphology and nanomechanical properties of the ultrafine-grained Ti-13Nb-13Zr alloy surface obtained using electrochemical anodization",
pages = "141-123",
volume = "323",
doi = "10.1007/978-3-030-86009-7_7"
}

Barjaktarević, D., Međo, B., Đokić, V.,& Rakin, M.. (2021). Morphology and nanomechanical properties of the ultrafine-grained Ti-13Nb-13Zr alloy surface obtained using electrochemical anodization. in Proceedings of the International Conference
of Experimental and Numerical Investigations
and New Technologies
Springer., 323, 123-141.
https://doi.org/10.1007/978-3-030-86009-7_7

Barjaktarević D, Međo B, Đokić V, Rakin M. Morphology and nanomechanical properties of the ultrafine-grained Ti-13Nb-13Zr alloy surface obtained using electrochemical anodization. in Proceedings of the International Conference
of Experimental and Numerical Investigations
and New Technologies. 2021;323:123-141.
doi:10.1007/978-3-030-86009-7_7 .

Barjaktarević, Dragana, Međo, Bojan, Đokić, Veljko, Rakin, Marko, "Morphology and nanomechanical properties of the ultrafine-grained Ti-13Nb-13Zr alloy surface obtained using electrochemical anodization" in Proceedings of the International Conference
of Experimental and Numerical Investigations
and New Technologies, 323 (2021):123-141,
https://doi.org/10.1007/978-3-030-86009-7_7 . .

TY  - CONF
AU  - Barjaktarević, Dragana
AU  - Đokić, Veljko
AU  - Stevanović, Sanja
AU  - Rakin, Marko
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5253
AB  - Surface roughness is one of the influencing factors on the friction and wear mechanism of metallic materials. However, surface roughness of metallic biomaterials plays a major role in assessing the biocompatibility and adhesion of human cells of the surrounding bone tissue on the biomaterials surface. Namely, it is already known that as the surface roughness increases, contact surface with human cells increases, and thus their adhesion to the surface. In order to achieve adequate roughness and biocompatibility, it is often necessary to additionally subject the surface of the biomaterial to modification. 
In the present study, nanostructured oxide coating on the Ti-13Nb-13Zr alloy was formed by electrochemical anodization in the 1M H3PO4 + NaF electrolyte, during 60, 90, 120 minutes. The scanning electron microscopy (SEM) was used to analyse the nanostructured oxide coating morphology and showed that highly ordered nanotubular oxide layers were formed by electrochemical anodization. The atomic force microscopy (AFM) was used to characterise the surface topography before and after electrochemical anodization. Results showed that the surface had higher roughness after electrochemical anodization compared to initial surface of the alloy. It was also shown that increase of anodizing time induces increase of the surface roughness.
PB  - Univerzitet u Beogradu, Mašinski fakultet
C3  - Proceedings of Balkantrib '20, 10th Intenational Conference on Tribology
T1  - Influence of the electrochemical anodization on the surface roughness of Ti-13Nb-13Zr medical alloy
EP  - 62
SP  - 59
UR  - https://hdl.handle.net/21.15107/rcub_technorep_5253
ER  - 

@conference{
author = "Barjaktarević, Dragana and Đokić, Veljko and Stevanović, Sanja and Rakin, Marko",
year = "2021",
abstract = "Surface roughness is one of the influencing factors on the friction and wear mechanism of metallic materials. However, surface roughness of metallic biomaterials plays a major role in assessing the biocompatibility and adhesion of human cells of the surrounding bone tissue on the biomaterials surface. Namely, it is already known that as the surface roughness increases, contact surface with human cells increases, and thus their adhesion to the surface. In order to achieve adequate roughness and biocompatibility, it is often necessary to additionally subject the surface of the biomaterial to modification. 
In the present study, nanostructured oxide coating on the Ti-13Nb-13Zr alloy was formed by electrochemical anodization in the 1M H3PO4 + NaF electrolyte, during 60, 90, 120 minutes. The scanning electron microscopy (SEM) was used to analyse the nanostructured oxide coating morphology and showed that highly ordered nanotubular oxide layers were formed by electrochemical anodization. The atomic force microscopy (AFM) was used to characterise the surface topography before and after electrochemical anodization. Results showed that the surface had higher roughness after electrochemical anodization compared to initial surface of the alloy. It was also shown that increase of anodizing time induces increase of the surface roughness.",
publisher = "Univerzitet u Beogradu, Mašinski fakultet",
journal = "Proceedings of Balkantrib '20, 10th Intenational Conference on Tribology",
title = "Influence of the electrochemical anodization on the surface roughness of Ti-13Nb-13Zr medical alloy",
pages = "62-59",
url = "https://hdl.handle.net/21.15107/rcub_technorep_5253"
}

Barjaktarević, D., Đokić, V., Stevanović, S.,& Rakin, M.. (2021). Influence of the electrochemical anodization on the surface roughness of Ti-13Nb-13Zr medical alloy. in Proceedings of Balkantrib '20, 10th Intenational Conference on Tribology
Univerzitet u Beogradu, Mašinski fakultet., 59-62.
https://hdl.handle.net/21.15107/rcub_technorep_5253

Barjaktarević D, Đokić V, Stevanović S, Rakin M. Influence of the electrochemical anodization on the surface roughness of Ti-13Nb-13Zr medical alloy. in Proceedings of Balkantrib '20, 10th Intenational Conference on Tribology. 2021;:59-62.
https://hdl.handle.net/21.15107/rcub_technorep_5253 .

Barjaktarević, Dragana, Đokić, Veljko, Stevanović, Sanja, Rakin, Marko, "Influence of the electrochemical anodization on the surface roughness of Ti-13Nb-13Zr medical alloy" in Proceedings of Balkantrib '20, 10th Intenational Conference on Tribology (2021):59-62,
https://hdl.handle.net/21.15107/rcub_technorep_5253 .

TY  - CONF
AU  - Barjaktarević, Dragana
AU  - Đokić, Veljko
AU  - Veljović, Đorđe
AU  - Rakin, Marko
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5257
PB  - Materials Research Society of Srebia
C3  - Materials Research Society of Srebia
T1  - Morphology and mechanical properties of the nanotubular oxide coating formed on the ultrafine-grained Ti-13Nb-13Zr alloy
SP  - 79
UR  - https://hdl.handle.net/21.15107/rcub_technorep_5257
ER  - 

@conference{
author = "Barjaktarević, Dragana and Đokić, Veljko and Veljović, Đorđe and Rakin, Marko",
year = "2021",
publisher = "Materials Research Society of Srebia",
journal = "Materials Research Society of Srebia",
title = "Morphology and mechanical properties of the nanotubular oxide coating formed on the ultrafine-grained Ti-13Nb-13Zr alloy",
pages = "79",
url = "https://hdl.handle.net/21.15107/rcub_technorep_5257"
}

Barjaktarević, D., Đokić, V., Veljović, Đ.,& Rakin, M.. (2021). Morphology and mechanical properties of the nanotubular oxide coating formed on the ultrafine-grained Ti-13Nb-13Zr alloy. in Materials Research Society of Srebia
Materials Research Society of Srebia., 79.
https://hdl.handle.net/21.15107/rcub_technorep_5257

Barjaktarević D, Đokić V, Veljović Đ, Rakin M. Morphology and mechanical properties of the nanotubular oxide coating formed on the ultrafine-grained Ti-13Nb-13Zr alloy. in Materials Research Society of Srebia. 2021;:79.
https://hdl.handle.net/21.15107/rcub_technorep_5257 .

Barjaktarević, Dragana, Đokić, Veljko, Veljović, Đorđe, Rakin, Marko, "Morphology and mechanical properties of the nanotubular oxide coating formed on the ultrafine-grained Ti-13Nb-13Zr alloy" in Materials Research Society of Srebia (2021):79,
https://hdl.handle.net/21.15107/rcub_technorep_5257 .

TY  - CONF
AU  - Barjaktarević, Dragana
AU  - Međo, Bojan
AU  - Đokić, Veljko
AU  - Rakin, Marko
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5259
AB  - Anodized surface on coarse-grained (CG) and ultrafine-grained (UFG) Ti-13Nb-13Zr alloy was obtained using electrochemical surface modification in the 1M H3PO4 + NaF electrolyte. Scanning electron microscopy (SEM) was used to characterise the microstructure of anodized surface, while mechanical surface properties were determined from the nanoindentation test. Numerical analysis of deformation of oxide film exposed to nanoindentation is performed on simplified 2D finite element models, with the main aim to determine the influence of the dimensions of the nanotubes on resistance to external loading. Software package Simulia Abaqus is used. It was shown that the homogeneous oxide film was formed at longer time period, while inhomogeneous oxide film was formed at shorter time period, for both materials. The oxide film was composed of nanotubes, whose deformation after the nanoindentation test is characterized by SEM. The surface of anodized alloys has lower mechanical surface properties (modulus of elasticity and nanohardness) than surface of non-anodized ones, which make them more acceptable for biomedical usage. Numerical calculations revealed the influence of morphology of the anodized surface layer on its load carrying capacity
PB  - Innovation Center of Faculty of Mechanical Engineering, Belgrade
C3  - International Conference of Exsperimental and Numerical Investigations and New Technologies
T1  - Microstructure and mechanical properties of anodized surface of ultrafine-grained Ti-13Nb-13Zr alloy for biomedical application
SP  - 36
UR  - https://hdl.handle.net/21.15107/rcub_technorep_5259
ER  - 

@conference{
author = "Barjaktarević, Dragana and Međo, Bojan and Đokić, Veljko and Rakin, Marko",
year = "2021",
abstract = "Anodized surface on coarse-grained (CG) and ultrafine-grained (UFG) Ti-13Nb-13Zr alloy was obtained using electrochemical surface modification in the 1M H3PO4 + NaF electrolyte. Scanning electron microscopy (SEM) was used to characterise the microstructure of anodized surface, while mechanical surface properties were determined from the nanoindentation test. Numerical analysis of deformation of oxide film exposed to nanoindentation is performed on simplified 2D finite element models, with the main aim to determine the influence of the dimensions of the nanotubes on resistance to external loading. Software package Simulia Abaqus is used. It was shown that the homogeneous oxide film was formed at longer time period, while inhomogeneous oxide film was formed at shorter time period, for both materials. The oxide film was composed of nanotubes, whose deformation after the nanoindentation test is characterized by SEM. The surface of anodized alloys has lower mechanical surface properties (modulus of elasticity and nanohardness) than surface of non-anodized ones, which make them more acceptable for biomedical usage. Numerical calculations revealed the influence of morphology of the anodized surface layer on its load carrying capacity",
publisher = "Innovation Center of Faculty of Mechanical Engineering, Belgrade",
journal = "International Conference of Exsperimental and Numerical Investigations and New Technologies",
title = "Microstructure and mechanical properties of anodized surface of ultrafine-grained Ti-13Nb-13Zr alloy for biomedical application",
pages = "36",
url = "https://hdl.handle.net/21.15107/rcub_technorep_5259"
}

Barjaktarević, D., Međo, B., Đokić, V.,& Rakin, M.. (2021). Microstructure and mechanical properties of anodized surface of ultrafine-grained Ti-13Nb-13Zr alloy for biomedical application. in International Conference of Exsperimental and Numerical Investigations and New Technologies
Innovation Center of Faculty of Mechanical Engineering, Belgrade., 36.
https://hdl.handle.net/21.15107/rcub_technorep_5259

Barjaktarević D, Međo B, Đokić V, Rakin M. Microstructure and mechanical properties of anodized surface of ultrafine-grained Ti-13Nb-13Zr alloy for biomedical application. in International Conference of Exsperimental and Numerical Investigations and New Technologies. 2021;:36.
https://hdl.handle.net/21.15107/rcub_technorep_5259 .

Barjaktarević, Dragana, Međo, Bojan, Đokić, Veljko, Rakin, Marko, "Microstructure and mechanical properties of anodized surface of ultrafine-grained Ti-13Nb-13Zr alloy for biomedical application" in International Conference of Exsperimental and Numerical Investigations and New Technologies (2021):36,
https://hdl.handle.net/21.15107/rcub_technorep_5259 .

TY  - JOUR
AU  - Barjaktarević, Dragana
AU  - Međo, Bojan
AU  - Stefane, Primoz
AU  - Gubeljak, Nenad
AU  - Cvijović-Alagić, Ivana
AU  - Đokić, Veljko
AU  - Rakin, Marko
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/11
AB  - Severe plastic deformation (SPD) is a popular group of techniques applied to achieve the nanostructuring of the metallic biomaterials and improvement of their mechanical characteristics. One of the most commonly used SPD methods is the high-pressure torsion (HPT) technique which enables the obtainment of the microstructure with small grains and high strength. In the present study, the influence of the plastic deformation and surface modification treatment on the tensile and corrosion properties of the Ti-13Nb-13Zr (wt%) alloy is investigated. In that purpose, the coarse-grained (CG) Ti-13Nb-13Zr (TNZ) alloy was subjected to the HPT processing by applying a pressure of 4.1 GPa with a rotational speed of 0.2 rpm and 5 revolutions at room temperature to obtain the ultrafine-grained (UFG) microstructure. The alloy microstructure before and after HPT processing was analysed using the scanning electron microscopy (SEM) and the X-ray diffraction (XRD). The homogeneity of the UFG TNZ alloy was determined by microhardness testing and microscopic observations. The nanotubular oxide layer on the surface of the TNZ alloy, both in CG and UFG condition, was formed by electrochemical anodization in 1 M H3PO4 + NaF electrolyte for 90 min. SEM analysis was used to characterise the morphology of the anodized surfaces, while energy dispersive spectroscopy was applied to determine the chemical composition of the nanostructured layers formed at the alloy surfaces. Mechanical properties of the TNZ alloy, before and after HPT processing and electrochemical anodization, were determined by tensile testing. After tensile testing, the fractographic analysis was conducted to identify the fracture mechanisms. The potentiodynamic polarization technique was used to determine the corrosion resistance of the alloy before and after plastic deformation and surface modification treatment. The obtained results showed that the alloy is reasonably homogeneous after the HPT processing. The XRD analyses reviled the presence of alpha ' and beta phases in the CG TNZ alloy microstructure, while the additional omega phase was detected in the microstructure of the UFG TNZ alloy. The HPT obtained alloy exhibits higher hardness and improved tensile properties than the alloy in the as-received CG condition, while the electrochemical anodization leads to a decrease of its mechanical properties. Both CG and UFG alloys show excellent corrosion stability in Ringer's solution. Moreover, electrochemical anodization leads to a decrease or an increase of the corrosion resistance of these materials, depending on the morphology of the formed nanotubular surface layers. The results indicate that the anodized CG TNZ alloy is characterized by a lower modulus of elasticity and better corrosion resistance properties than the anodized UFG TNZ alloy.
PB  - Korean Inst Metals Materials, Seoul
T2  - Metals and Materials International
T1  - Tensile and Corrosion Properties of Anodized Ultrafine-Grained Ti-13Nb-13Zr Biomedical Alloy Obtained by High-Pressure Torsion
EP  - 3341
IS  - 9
SP  - 3325
VL  - 27
DO  - 10.1007/s12540-020-00837-z
ER  - 

@article{
author = "Barjaktarević, Dragana and Međo, Bojan and Stefane, Primoz and Gubeljak, Nenad and Cvijović-Alagić, Ivana and Đokić, Veljko and Rakin, Marko",
year = "2021",
abstract = "Severe plastic deformation (SPD) is a popular group of techniques applied to achieve the nanostructuring of the metallic biomaterials and improvement of their mechanical characteristics. One of the most commonly used SPD methods is the high-pressure torsion (HPT) technique which enables the obtainment of the microstructure with small grains and high strength. In the present study, the influence of the plastic deformation and surface modification treatment on the tensile and corrosion properties of the Ti-13Nb-13Zr (wt%) alloy is investigated. In that purpose, the coarse-grained (CG) Ti-13Nb-13Zr (TNZ) alloy was subjected to the HPT processing by applying a pressure of 4.1 GPa with a rotational speed of 0.2 rpm and 5 revolutions at room temperature to obtain the ultrafine-grained (UFG) microstructure. The alloy microstructure before and after HPT processing was analysed using the scanning electron microscopy (SEM) and the X-ray diffraction (XRD). The homogeneity of the UFG TNZ alloy was determined by microhardness testing and microscopic observations. The nanotubular oxide layer on the surface of the TNZ alloy, both in CG and UFG condition, was formed by electrochemical anodization in 1 M H3PO4 + NaF electrolyte for 90 min. SEM analysis was used to characterise the morphology of the anodized surfaces, while energy dispersive spectroscopy was applied to determine the chemical composition of the nanostructured layers formed at the alloy surfaces. Mechanical properties of the TNZ alloy, before and after HPT processing and electrochemical anodization, were determined by tensile testing. After tensile testing, the fractographic analysis was conducted to identify the fracture mechanisms. The potentiodynamic polarization technique was used to determine the corrosion resistance of the alloy before and after plastic deformation and surface modification treatment. The obtained results showed that the alloy is reasonably homogeneous after the HPT processing. The XRD analyses reviled the presence of alpha ' and beta phases in the CG TNZ alloy microstructure, while the additional omega phase was detected in the microstructure of the UFG TNZ alloy. The HPT obtained alloy exhibits higher hardness and improved tensile properties than the alloy in the as-received CG condition, while the electrochemical anodization leads to a decrease of its mechanical properties. Both CG and UFG alloys show excellent corrosion stability in Ringer's solution. Moreover, electrochemical anodization leads to a decrease or an increase of the corrosion resistance of these materials, depending on the morphology of the formed nanotubular surface layers. The results indicate that the anodized CG TNZ alloy is characterized by a lower modulus of elasticity and better corrosion resistance properties than the anodized UFG TNZ alloy.",
publisher = "Korean Inst Metals Materials, Seoul",
journal = "Metals and Materials International",
title = "Tensile and Corrosion Properties of Anodized Ultrafine-Grained Ti-13Nb-13Zr Biomedical Alloy Obtained by High-Pressure Torsion",
pages = "3341-3325",
number = "9",
volume = "27",
doi = "10.1007/s12540-020-00837-z"
}

Barjaktarević, D., Međo, B., Stefane, P., Gubeljak, N., Cvijović-Alagić, I., Đokić, V.,& Rakin, M.. (2021). Tensile and Corrosion Properties of Anodized Ultrafine-Grained Ti-13Nb-13Zr Biomedical Alloy Obtained by High-Pressure Torsion. in Metals and Materials International
Korean Inst Metals Materials, Seoul., 27(9), 3325-3341.
https://doi.org/10.1007/s12540-020-00837-z

Barjaktarević D, Međo B, Stefane P, Gubeljak N, Cvijović-Alagić I, Đokić V, Rakin M. Tensile and Corrosion Properties of Anodized Ultrafine-Grained Ti-13Nb-13Zr Biomedical Alloy Obtained by High-Pressure Torsion. in Metals and Materials International. 2021;27(9):3325-3341.
doi:10.1007/s12540-020-00837-z .

Barjaktarević, Dragana, Međo, Bojan, Stefane, Primoz, Gubeljak, Nenad, Cvijović-Alagić, Ivana, Đokić, Veljko, Rakin, Marko, "Tensile and Corrosion Properties of Anodized Ultrafine-Grained Ti-13Nb-13Zr Biomedical Alloy Obtained by High-Pressure Torsion" in Metals and Materials International, 27, no. 9 (2021):3325-3341,
https://doi.org/10.1007/s12540-020-00837-z . .

TY  - CONF
AU  - Barjaktarević, Dragana
AU  - Međo, Bojan
AU  - Gubeljak, Nenad
AU  - Cvijović-Alagić, Ivana
AU  - Stefane, Primoz
AU  - Đokić, Veljko
AU  - Rakin, Marko
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4751
AB  - Due to their excellent mechanical properties and corrosion resistance, titanium-based materials are widely represented in aeronautics, chemical industry and medicine, where they are considered the best replacement for damaged hard tissues. In order to obtain optimal properties for medical applications, commercially pure titanium (cpTi) is often alloyed. The beta-type titanium alloys containing Nb, Zr, Ta, Mo, Sn have attracted considerable attention, due to their unique combinations of high strength, low modulus of elasticity, superior corrosion resistance and biocompatibility. Also, titanium-based materials can be processed by surface modifications, including the anodization, which belongs to the group of chemical nanostructured surface modifications. Analysis of microstructure of two-phase Ti-13Nb-13Zr (TNZ) alloy was done by Scanning Electron Microscopy (SEM). Characterisation of surface, obtained by anodization in the H3PO4 + NaF solution, during 90 minutes process, was performed by SEM. Micro Tensile Specimens (MTS) were cut from TNZ and anodized TNZ disks and were subjected to the tensile test using servo-hydraulic testing machine Instron 1255. Stereometric measurement of strain at the surface of the MTS during tension was done using the Aramis system. Results showed that anodization process led to a creation of heterogeneous layer of nanotubes. Anodized TNZ alloy had lower elastic modulus and tensile strength comparing to the initial alloy. In order to better understand tensile behaviour, numerical analysis of non-anodized alloy was done. The 3D numerical model of MTS, which simulated the tensile test, was made in Abaqus software package. Good correlation between experimental and numerical results was obtained.
C3  - Procedia Structural Integrity
T1  - Experimental and numerical analysis of tensile properties of Ti-13Nb-13Zr alloy and determination of influence of anodization process
EP  - 2194
SP  - 2187
VL  - 28
DO  - 10.1016/j.prostr.2020.11.047
ER  - 

@conference{
author = "Barjaktarević, Dragana and Međo, Bojan and Gubeljak, Nenad and Cvijović-Alagić, Ivana and Stefane, Primoz and Đokić, Veljko and Rakin, Marko",
year = "2020",
abstract = "Due to their excellent mechanical properties and corrosion resistance, titanium-based materials are widely represented in aeronautics, chemical industry and medicine, where they are considered the best replacement for damaged hard tissues. In order to obtain optimal properties for medical applications, commercially pure titanium (cpTi) is often alloyed. The beta-type titanium alloys containing Nb, Zr, Ta, Mo, Sn have attracted considerable attention, due to their unique combinations of high strength, low modulus of elasticity, superior corrosion resistance and biocompatibility. Also, titanium-based materials can be processed by surface modifications, including the anodization, which belongs to the group of chemical nanostructured surface modifications. Analysis of microstructure of two-phase Ti-13Nb-13Zr (TNZ) alloy was done by Scanning Electron Microscopy (SEM). Characterisation of surface, obtained by anodization in the H3PO4 + NaF solution, during 90 minutes process, was performed by SEM. Micro Tensile Specimens (MTS) were cut from TNZ and anodized TNZ disks and were subjected to the tensile test using servo-hydraulic testing machine Instron 1255. Stereometric measurement of strain at the surface of the MTS during tension was done using the Aramis system. Results showed that anodization process led to a creation of heterogeneous layer of nanotubes. Anodized TNZ alloy had lower elastic modulus and tensile strength comparing to the initial alloy. In order to better understand tensile behaviour, numerical analysis of non-anodized alloy was done. The 3D numerical model of MTS, which simulated the tensile test, was made in Abaqus software package. Good correlation between experimental and numerical results was obtained.",
journal = "Procedia Structural Integrity",
title = "Experimental and numerical analysis of tensile properties of Ti-13Nb-13Zr alloy and determination of influence of anodization process",
pages = "2194-2187",
volume = "28",
doi = "10.1016/j.prostr.2020.11.047"
}

Barjaktarević, D., Međo, B., Gubeljak, N., Cvijović-Alagić, I., Stefane, P., Đokić, V.,& Rakin, M.. (2020). Experimental and numerical analysis of tensile properties of Ti-13Nb-13Zr alloy and determination of influence of anodization process. in Procedia Structural Integrity, 28, 2187-2194.
https://doi.org/10.1016/j.prostr.2020.11.047

Barjaktarević D, Međo B, Gubeljak N, Cvijović-Alagić I, Stefane P, Đokić V, Rakin M. Experimental and numerical analysis of tensile properties of Ti-13Nb-13Zr alloy and determination of influence of anodization process. in Procedia Structural Integrity. 2020;28:2187-2194.
doi:10.1016/j.prostr.2020.11.047 .

Barjaktarević, Dragana, Međo, Bojan, Gubeljak, Nenad, Cvijović-Alagić, Ivana, Stefane, Primoz, Đokić, Veljko, Rakin, Marko, "Experimental and numerical analysis of tensile properties of Ti-13Nb-13Zr alloy and determination of influence of anodization process" in Procedia Structural Integrity, 28 (2020):2187-2194,
https://doi.org/10.1016/j.prostr.2020.11.047 . .

TY  - JOUR
AU  - Barjaktarević, Dragana
AU  - Đokić, Veljko
AU  - Bajat, Jelena
AU  - Dimić, Ivana
AU  - Cvijović-Alagić, Ivana
AU  - Rakin, Marko
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4056
AB  - On the surface of the ultrafine-grained Ti-13Nb-13Zr alloy and the coarse-grained Ti-13Nb-13Zr alloy nanotubular oxide layers were formed by electrochemical anodization in the 1 M H3PO4 + NaF electrolyte in order to evaluate the electrochemical behaviour in the artificial saliva. SEM images showed that homogeneous nanotubular oxide layers could be formed by anodic oxidation of titanium alloys in an electrolyte with fluoride ions. These two titanium alloys, like other materials developed to replace the bone tissue in the human body, have to be highly corrosion resistant, which is one of the most common requirement in terms of the biocompatibility, damage and fracture prevention. The alloys were analysed by means of the electrochemical impedance spectroscopy and potentiodynamic polarization. The analyzed alloys had good corrosion stability, while nanotubular oxide layer improved their corrosion resistance.
PB  - Elsevier, Amsterdam
T2  - Theoretical and Applied Fracture Mechanics
T1  - The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti-13Nb-13Zr alloy in artificial saliva
VL  - 103
DO  - 10.1016/j.tafmec.2019.102307
ER  - 

@article{
author = "Barjaktarević, Dragana and Đokić, Veljko and Bajat, Jelena and Dimić, Ivana and Cvijović-Alagić, Ivana and Rakin, Marko",
year = "2019",
abstract = "On the surface of the ultrafine-grained Ti-13Nb-13Zr alloy and the coarse-grained Ti-13Nb-13Zr alloy nanotubular oxide layers were formed by electrochemical anodization in the 1 M H3PO4 + NaF electrolyte in order to evaluate the electrochemical behaviour in the artificial saliva. SEM images showed that homogeneous nanotubular oxide layers could be formed by anodic oxidation of titanium alloys in an electrolyte with fluoride ions. These two titanium alloys, like other materials developed to replace the bone tissue in the human body, have to be highly corrosion resistant, which is one of the most common requirement in terms of the biocompatibility, damage and fracture prevention. The alloys were analysed by means of the electrochemical impedance spectroscopy and potentiodynamic polarization. The analyzed alloys had good corrosion stability, while nanotubular oxide layer improved their corrosion resistance.",
publisher = "Elsevier, Amsterdam",
journal = "Theoretical and Applied Fracture Mechanics",
title = "The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti-13Nb-13Zr alloy in artificial saliva",
volume = "103",
doi = "10.1016/j.tafmec.2019.102307"
}

Barjaktarević, D., Đokić, V., Bajat, J., Dimić, I., Cvijović-Alagić, I.,& Rakin, M.. (2019). The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti-13Nb-13Zr alloy in artificial saliva. in Theoretical and Applied Fracture Mechanics
Elsevier, Amsterdam., 103.
https://doi.org/10.1016/j.tafmec.2019.102307

Barjaktarević D, Đokić V, Bajat J, Dimić I, Cvijović-Alagić I, Rakin M. The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti-13Nb-13Zr alloy in artificial saliva. in Theoretical and Applied Fracture Mechanics. 2019;103.
doi:10.1016/j.tafmec.2019.102307 .

Barjaktarević, Dragana, Đokić, Veljko, Bajat, Jelena, Dimić, Ivana, Cvijović-Alagić, Ivana, Rakin, Marko, "The influence of the surface nanostructured modification on the corrosion resistance of the ultrafine-grained Ti-13Nb-13Zr alloy in artificial saliva" in Theoretical and Applied Fracture Mechanics, 103 (2019),
https://doi.org/10.1016/j.tafmec.2019.102307 . .

TY  - CONF
AU  - Rakin, Marko
AU  - Damjanov, Katarina
AU  - Mitrović, Goran
AU  - Barjaktarević, Dragana
AU  - Rakin, Marica
AU  - Komatina, Mirko
AU  - Bugarski, Branko
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6017
AB  - Agricultural waste is a suitable
renewable source for the production of biogas,
which can be converted into different forms of
energy. Chemical pre-treatment can make
anaerobic digestion faster and increase biogas
yields. In this study, a mechanical and alkaline
combination of pre-treatment is used. The aim of
study is to compare the biogas yield with and
without pre-treatment, as well as to develop a
device which can be used as a system for chemical
pre-treatment. Results show that a combination
of the granulation of raw materials and alkaline
treatment is an effective pre-treatment for
increasing biogas yield.
PB  - Research and Development Center “ALFATEC”, Niš, Serbia; Complex System Research Centre, Niš, Serbia
C3  - 4th Virtual International Conference on Science,Technology and Management in Energy
T1  - Application of pre-treatment for enhancing biogas production from plant-based agricultural waste
EP  - 78
SP  - 73
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6017
ER  - 

@conference{
author = "Rakin, Marko and Damjanov, Katarina and Mitrović, Goran and Barjaktarević, Dragana and Rakin, Marica and Komatina, Mirko and Bugarski, Branko",
year = "2018",
abstract = "Agricultural waste is a suitable
renewable source for the production of biogas,
which can be converted into different forms of
energy. Chemical pre-treatment can make
anaerobic digestion faster and increase biogas
yields. In this study, a mechanical and alkaline
combination of pre-treatment is used. The aim of
study is to compare the biogas yield with and
without pre-treatment, as well as to develop a
device which can be used as a system for chemical
pre-treatment. Results show that a combination
of the granulation of raw materials and alkaline
treatment is an effective pre-treatment for
increasing biogas yield.",
publisher = "Research and Development Center “ALFATEC”, Niš, Serbia; Complex System Research Centre, Niš, Serbia",
journal = "4th Virtual International Conference on Science,Technology and Management in Energy",
title = "Application of pre-treatment for enhancing biogas production from plant-based agricultural waste",
pages = "78-73",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6017"
}

Rakin, M., Damjanov, K., Mitrović, G., Barjaktarević, D., Rakin, M., Komatina, M.,& Bugarski, B.. (2018). Application of pre-treatment for enhancing biogas production from plant-based agricultural waste. in 4th Virtual International Conference on Science,Technology and Management in Energy
Research and Development Center “ALFATEC”, Niš, Serbia; Complex System Research Centre, Niš, Serbia., 73-78.
https://hdl.handle.net/21.15107/rcub_technorep_6017

Rakin M, Damjanov K, Mitrović G, Barjaktarević D, Rakin M, Komatina M, Bugarski B. Application of pre-treatment for enhancing biogas production from plant-based agricultural waste. in 4th Virtual International Conference on Science,Technology and Management in Energy. 2018;:73-78.
https://hdl.handle.net/21.15107/rcub_technorep_6017 .

Rakin, Marko, Damjanov, Katarina, Mitrović, Goran, Barjaktarević, Dragana, Rakin, Marica, Komatina, Mirko, Bugarski, Branko, "Application of pre-treatment for enhancing biogas production from plant-based agricultural waste" in 4th Virtual International Conference on Science,Technology and Management in Energy (2018):73-78,
https://hdl.handle.net/21.15107/rcub_technorep_6017 .

TY  - CONF
AU  - Barjaktarević, Dragana
AU  - Rakin, Marko
AU  - Međo, Bojan
AU  - Đokić, Veljko
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5250
AB  - The commercially pure titanium (cpTi) and especially titanium (Ti) alloys are materials increasingly
used in orthopaedic and dental implants. In order to enhance the implant material properties, Ti-based materials may be modified by severe plastic deformation (SPD) methods. One of the most attractive SPD methods is high-pressure torsion (HPT), as a method for obtaining submicron-sized grains, with the aim to improve, among others, mechanical properties of metallic materials. In the present study, ultrafine-grained titanium (UFG cpTi) and ultrafine-grained Ti-13Nb-13Zr (UFG TNZ) alloy samples were obtained by high pressure torsion (HPT) under a pressure of 4.1 GPa with a rotational speed of 0.2 rpm up to 5 rotations at room temperature. The homogeneity of the material was determined by using Vickers microhardness tester and analysing the obtained microhardness profile along the samples diameters. The results show that materials are reasonably homogeneous after HPT processing. The aim of this study is to determine the mechanical behaviour of the commercially pure titanium and titanium alloy before and after HPT processing using the nanoindentation technique. Obtained results show that ultrafine-grained materials have lower modulus of elasticity than coarsegrained (CG) materials, which means that the values are closer to those of bones, making the discontinuity of mechanical properties at the bone-implant interface less pronounced. On the other hand, UFG materials have higher values of nanohardness than CG materials.
PB  - Univerzitet u Novom Sadu, Fakultet tehničkih nauka
C3  - Proceedings of TEAM 2018 9 th International Scientific and Expert Conference
T1  - Nanoindentation study of ultrafine-grained titanium-based materials
EP  - 122
SP  - 117
UR  - https://hdl.handle.net/21.15107/rcub_technorep_5250
ER  - 

@conference{
author = "Barjaktarević, Dragana and Rakin, Marko and Međo, Bojan and Đokić, Veljko",
year = "2018",
abstract = "The commercially pure titanium (cpTi) and especially titanium (Ti) alloys are materials increasingly
used in orthopaedic and dental implants. In order to enhance the implant material properties, Ti-based materials may be modified by severe plastic deformation (SPD) methods. One of the most attractive SPD methods is high-pressure torsion (HPT), as a method for obtaining submicron-sized grains, with the aim to improve, among others, mechanical properties of metallic materials. In the present study, ultrafine-grained titanium (UFG cpTi) and ultrafine-grained Ti-13Nb-13Zr (UFG TNZ) alloy samples were obtained by high pressure torsion (HPT) under a pressure of 4.1 GPa with a rotational speed of 0.2 rpm up to 5 rotations at room temperature. The homogeneity of the material was determined by using Vickers microhardness tester and analysing the obtained microhardness profile along the samples diameters. The results show that materials are reasonably homogeneous after HPT processing. The aim of this study is to determine the mechanical behaviour of the commercially pure titanium and titanium alloy before and after HPT processing using the nanoindentation technique. Obtained results show that ultrafine-grained materials have lower modulus of elasticity than coarsegrained (CG) materials, which means that the values are closer to those of bones, making the discontinuity of mechanical properties at the bone-implant interface less pronounced. On the other hand, UFG materials have higher values of nanohardness than CG materials.",
publisher = "Univerzitet u Novom Sadu, Fakultet tehničkih nauka",
journal = "Proceedings of TEAM 2018 9 th International Scientific and Expert Conference",
title = "Nanoindentation study of ultrafine-grained titanium-based materials",
pages = "122-117",
url = "https://hdl.handle.net/21.15107/rcub_technorep_5250"
}

Barjaktarević, D., Rakin, M., Međo, B.,& Đokić, V.. (2018). Nanoindentation study of ultrafine-grained titanium-based materials. in Proceedings of TEAM 2018 9 th International Scientific and Expert Conference
Univerzitet u Novom Sadu, Fakultet tehničkih nauka., 117-122.
https://hdl.handle.net/21.15107/rcub_technorep_5250

Barjaktarević D, Rakin M, Međo B, Đokić V. Nanoindentation study of ultrafine-grained titanium-based materials. in Proceedings of TEAM 2018 9 th International Scientific and Expert Conference. 2018;:117-122.
https://hdl.handle.net/21.15107/rcub_technorep_5250 .

Barjaktarević, Dragana, Rakin, Marko, Međo, Bojan, Đokić, Veljko, "Nanoindentation study of ultrafine-grained titanium-based materials" in Proceedings of TEAM 2018 9 th International Scientific and Expert Conference (2018):117-122,
https://hdl.handle.net/21.15107/rcub_technorep_5250 .

TY  - CONF
AU  - Barjaktarević, Dragana
AU  - Veljović, Đorđe
AU  - Dimić, Ivana
AU  - Đokić, Veljko
AU  - Rakin, Marko
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5255
AB  - Primary stability of biomaterials is associated with the mechanical contact of an implant
with the surrounding bone, which is governed by surface properties. The implant often needs
some kind of modification to optimize and improve biological properties of the surface. In the
present study, nanotubular oxide layer on Ti-13Nb-13Zr alloy (coarse-grained, CG, and ultrafine-grained, UFG, obtained by high pressure torsion) alloy was formed by means of electrochemical anodization in the 1M H3PO4 + NaF electrolyte, during 60 and 90 minutes. The atomic force
microscopy (AFM) was studied to characterize the surface topography and it was shown that
highly ordered nanotubular layers were obtained by anodization. Also, results show that increasing anodizing time increases roughness of the surface. The aim of this paper is to determine the
vitro biocompatibility of the titanium alloy after electrochemical anodization. In vitro nanotubular oxide layer examinations were performed on the human fibroblast cell lines (MRC-5). The cytotoxicity of the examined materials was measured as a percent of cell growth inhibition using in
vitro colorimetric methyl-thiazol-tetrazolium (MTT) test. Scanning Electron Microscope (SEM)
observation of MRC-5 cell was performed using a SEM MIRA3 TESCAN which operated at an
accelerating voltage of 4.5 keV. Results show that nanotubular oxide layer formed on the UFG
Ti-13Nb-13Zr alloy during 90 minutes indicates better cells contact and spreading along nanotubular surface.
PB  - Serbian Academy of Sciences and Arts,  Serbia, Belgrade
C3  - Serbian Ceramic Society
T1  - The biocompatibility of nanotubular oxide layer formed on the ultrafine-grained Ti-13Nb-13Zr alloy
SP  - 85
UR  - https://hdl.handle.net/21.15107/rcub_technorep_5255
ER  - 

@conference{
author = "Barjaktarević, Dragana and Veljović, Đorđe and Dimić, Ivana and Đokić, Veljko and Rakin, Marko",
year = "2018",
abstract = "Primary stability of biomaterials is associated with the mechanical contact of an implant
with the surrounding bone, which is governed by surface properties. The implant often needs
some kind of modification to optimize and improve biological properties of the surface. In the
present study, nanotubular oxide layer on Ti-13Nb-13Zr alloy (coarse-grained, CG, and ultrafine-grained, UFG, obtained by high pressure torsion) alloy was formed by means of electrochemical anodization in the 1M H3PO4 + NaF electrolyte, during 60 and 90 minutes. The atomic force
microscopy (AFM) was studied to characterize the surface topography and it was shown that
highly ordered nanotubular layers were obtained by anodization. Also, results show that increasing anodizing time increases roughness of the surface. The aim of this paper is to determine the
vitro biocompatibility of the titanium alloy after electrochemical anodization. In vitro nanotubular oxide layer examinations were performed on the human fibroblast cell lines (MRC-5). The cytotoxicity of the examined materials was measured as a percent of cell growth inhibition using in
vitro colorimetric methyl-thiazol-tetrazolium (MTT) test. Scanning Electron Microscope (SEM)
observation of MRC-5 cell was performed using a SEM MIRA3 TESCAN which operated at an
accelerating voltage of 4.5 keV. Results show that nanotubular oxide layer formed on the UFG
Ti-13Nb-13Zr alloy during 90 minutes indicates better cells contact and spreading along nanotubular surface.",
publisher = "Serbian Academy of Sciences and Arts,  Serbia, Belgrade",
journal = "Serbian Ceramic Society",
title = "The biocompatibility of nanotubular oxide layer formed on the ultrafine-grained Ti-13Nb-13Zr alloy",
pages = "85",
url = "https://hdl.handle.net/21.15107/rcub_technorep_5255"
}

Barjaktarević, D., Veljović, Đ., Dimić, I., Đokić, V.,& Rakin, M.. (2018). The biocompatibility of nanotubular oxide layer formed on the ultrafine-grained Ti-13Nb-13Zr alloy. in Serbian Ceramic Society
Serbian Academy of Sciences and Arts,  Serbia, Belgrade., 85.
https://hdl.handle.net/21.15107/rcub_technorep_5255

Barjaktarević D, Veljović Đ, Dimić I, Đokić V, Rakin M. The biocompatibility of nanotubular oxide layer formed on the ultrafine-grained Ti-13Nb-13Zr alloy. in Serbian Ceramic Society. 2018;:85.
https://hdl.handle.net/21.15107/rcub_technorep_5255 .

Barjaktarević, Dragana, Veljović, Đorđe, Dimić, Ivana, Đokić, Veljko, Rakin, Marko, "The biocompatibility of nanotubular oxide layer formed on the ultrafine-grained Ti-13Nb-13Zr alloy" in Serbian Ceramic Society (2018):85,
https://hdl.handle.net/21.15107/rcub_technorep_5255 .

TY  - CONF
AU  - Đokić, Veljko
AU  - Barjaktarević, Dragana
AU  - Veljović, Đorđe
AU  - Dimić, Ivana
AU  - Kojić, Vesna
AU  - Rakin, Marko
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5256
AB  - To improve their biological properties, biomaterials typically need some surface modification. These surface modifications can be classified into four categories: physical, chemical, mechanical and biochemical. One of the most commonly used methods is the electrochemical anodization, which is a simple process used to form nanotubular oxide layer on the metal surface by oxidation. In the present study, nanotubular oxide layer was formed on coarse-grained (CG) Ti-13Nb-13Zr alloy and ultrafine-grained (UFG) Ti-13Nb-13Zr alloy, obtained by high pressure torsion, using electrochemical anodization in the 1M H3PO4 + NaF electrolyte, during 60 minutes and 90 minutes. The scanning electron microscope (SEM) was used to characterize the surface and it showed that homogenous nanotubular layers were obtained by anodization during 90 minutes, while anodization during 60 minutes produced inhomogeneous nanotubular oxide layer. Also, the results show that the nanotubular oxide layer on the UFG Ti-13Nb-13Zr was more homogeneous then the one on CG material. The aim of this study is to determine the in vitro biocompatibility of the titanium alloy before and after electrochemical anodization during 90 minutes. In vitro nanotubular oxide layer examinations were performed on the human (MRC-5) and animal (L929) fibroblast cells lines. The cytotoxicity of the examined materials was measured as a percent of cell growth inhibition using in vitro colorimetric methyl-thiazol-tetrazolium (MTT) test. Results show that nanotubular oxide layer formed on the UFG Ti-13Nb-13Zr alloy during 90 minutes allow better cells contact and spreading along nanotubular surface.
PB  - Programme and The Book of Abstracts, TWENTIETH ANNUAL CONFERENCE YUCOMAT 2018
C3  - Materials Research Society of Srebia
T1  - Improvement of Biocompatibility by Formation of Nanotubular Oxide Layer on the Ultrafine Grained Ti-13Nb-13Zr Alloy
SP  - 139
UR  - https://hdl.handle.net/21.15107/rcub_technorep_5256
ER  - 

@conference{
author = "Đokić, Veljko and Barjaktarević, Dragana and Veljović, Đorđe and Dimić, Ivana and Kojić, Vesna and Rakin, Marko",
year = "2018",
abstract = "To improve their biological properties, biomaterials typically need some surface modification. These surface modifications can be classified into four categories: physical, chemical, mechanical and biochemical. One of the most commonly used methods is the electrochemical anodization, which is a simple process used to form nanotubular oxide layer on the metal surface by oxidation. In the present study, nanotubular oxide layer was formed on coarse-grained (CG) Ti-13Nb-13Zr alloy and ultrafine-grained (UFG) Ti-13Nb-13Zr alloy, obtained by high pressure torsion, using electrochemical anodization in the 1M H3PO4 + NaF electrolyte, during 60 minutes and 90 minutes. The scanning electron microscope (SEM) was used to characterize the surface and it showed that homogenous nanotubular layers were obtained by anodization during 90 minutes, while anodization during 60 minutes produced inhomogeneous nanotubular oxide layer. Also, the results show that the nanotubular oxide layer on the UFG Ti-13Nb-13Zr was more homogeneous then the one on CG material. The aim of this study is to determine the in vitro biocompatibility of the titanium alloy before and after electrochemical anodization during 90 minutes. In vitro nanotubular oxide layer examinations were performed on the human (MRC-5) and animal (L929) fibroblast cells lines. The cytotoxicity of the examined materials was measured as a percent of cell growth inhibition using in vitro colorimetric methyl-thiazol-tetrazolium (MTT) test. Results show that nanotubular oxide layer formed on the UFG Ti-13Nb-13Zr alloy during 90 minutes allow better cells contact and spreading along nanotubular surface.",
publisher = "Programme and The Book of Abstracts, TWENTIETH ANNUAL CONFERENCE YUCOMAT 2018",
journal = "Materials Research Society of Srebia",
title = "Improvement of Biocompatibility by Formation of Nanotubular Oxide Layer on the Ultrafine Grained Ti-13Nb-13Zr Alloy",
pages = "139",
url = "https://hdl.handle.net/21.15107/rcub_technorep_5256"
}

Đokić, V., Barjaktarević, D., Veljović, Đ., Dimić, I., Kojić, V.,& Rakin, M.. (2018). Improvement of Biocompatibility by Formation of Nanotubular Oxide Layer on the Ultrafine Grained Ti-13Nb-13Zr Alloy. in Materials Research Society of Srebia
Programme and The Book of Abstracts, TWENTIETH ANNUAL CONFERENCE YUCOMAT 2018., 139.
https://hdl.handle.net/21.15107/rcub_technorep_5256

Đokić V, Barjaktarević D, Veljović Đ, Dimić I, Kojić V, Rakin M. Improvement of Biocompatibility by Formation of Nanotubular Oxide Layer on the Ultrafine Grained Ti-13Nb-13Zr Alloy. in Materials Research Society of Srebia. 2018;:139.
https://hdl.handle.net/21.15107/rcub_technorep_5256 .

Đokić, Veljko, Barjaktarević, Dragana, Veljović, Đorđe, Dimić, Ivana, Kojić, Vesna, Rakin, Marko, "Improvement of Biocompatibility by Formation of Nanotubular Oxide Layer on the Ultrafine Grained Ti-13Nb-13Zr Alloy" in Materials Research Society of Srebia (2018):139,
https://hdl.handle.net/21.15107/rcub_technorep_5256 .

TY  - CONF
AU  - Barjaktarević, Dragana
AU  - Bajat, Jelena
AU  - Cvijović-Alagić, Ivana
AU  - Dimić, Ivana
AU  - Hohenwarter, Anton
AU  - Đokić, Veljko
AU  - Rakin, Marko
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3785
AB  - In order to optimize and enhance the implant material properties, metallic materials may be modified by severe plastic deformation (SPD) procedures. One of the most attracting SPD methods is high-pressure torsion (HPT), which is method where deformation is obtained mainly by simple shear. In the present study ultrafine-grained titanium (UFG cpTi) and ultrafine-grained Ti-13Nb-13Zr (UFG TNZ) alloy were obtained by high pressure torsion (HPT) under a pressure of 4.1 GPa with a rotational speed of 0.2 rpm up to 5 rotations at room temperature. In order to analyse microstructure of materials before and after HPT process, scanning electron microscope (SEM) was used. The aim of this study was to determine the corrosion resistance of titanium and its alloy after HPT process. Electrochemical measurements were performed in artificial saliva with a pH value of 5.5 at 37 degrees C, in order to simulate the oral environment. The materials were analysed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. All examined materials showed good corrosion resistance, but results indicate that HPT process can improves corrosion resistance.
PB  - Elsevier Science Bv, Amsterdam
C3  - Procedia Structural Integrity
T1  - The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion
EP  - 1839
SP  - 1834
VL  - 13
DO  - 10.1016/j.prostr.2018.12.332
ER  - 

@conference{
author = "Barjaktarević, Dragana and Bajat, Jelena and Cvijović-Alagić, Ivana and Dimić, Ivana and Hohenwarter, Anton and Đokić, Veljko and Rakin, Marko",
year = "2018",
abstract = "In order to optimize and enhance the implant material properties, metallic materials may be modified by severe plastic deformation (SPD) procedures. One of the most attracting SPD methods is high-pressure torsion (HPT), which is method where deformation is obtained mainly by simple shear. In the present study ultrafine-grained titanium (UFG cpTi) and ultrafine-grained Ti-13Nb-13Zr (UFG TNZ) alloy were obtained by high pressure torsion (HPT) under a pressure of 4.1 GPa with a rotational speed of 0.2 rpm up to 5 rotations at room temperature. In order to analyse microstructure of materials before and after HPT process, scanning electron microscope (SEM) was used. The aim of this study was to determine the corrosion resistance of titanium and its alloy after HPT process. Electrochemical measurements were performed in artificial saliva with a pH value of 5.5 at 37 degrees C, in order to simulate the oral environment. The materials were analysed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. All examined materials showed good corrosion resistance, but results indicate that HPT process can improves corrosion resistance.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Procedia Structural Integrity",
title = "The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion",
pages = "1839-1834",
volume = "13",
doi = "10.1016/j.prostr.2018.12.332"
}

Barjaktarević, D., Bajat, J., Cvijović-Alagić, I., Dimić, I., Hohenwarter, A., Đokić, V.,& Rakin, M.. (2018). The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion. in Procedia Structural Integrity
Elsevier Science Bv, Amsterdam., 13, 1834-1839.
https://doi.org/10.1016/j.prostr.2018.12.332

Barjaktarević D, Bajat J, Cvijović-Alagić I, Dimić I, Hohenwarter A, Đokić V, Rakin M. The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion. in Procedia Structural Integrity. 2018;13:1834-1839.
doi:10.1016/j.prostr.2018.12.332 .

Barjaktarević, Dragana, Bajat, Jelena, Cvijović-Alagić, Ivana, Dimić, Ivana, Hohenwarter, Anton, Đokić, Veljko, Rakin, Marko, "The corrosion resistance in artificial saliva of titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion" in Procedia Structural Integrity, 13 (2018):1834-1839,
https://doi.org/10.1016/j.prostr.2018.12.332 . .

TY  - CONF
AU  - Barjaktarević, Dragana
AU  - Dimić, Ivana
AU  - Cvijović-Alagić, Ivana
AU  - Đokić, Veljko
AU  - Rakin, Marko
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3801
PB  - Belgrade : Serbian Academy of Sciences and Arts
C3  - Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructu
T1  - Morphology of Nanotubular Oxide Layer Formation on Titanium and Titanium Alloy Using Electrochemical Anodization
EP  - 162
SP  - 160
UR  - https://hdl.handle.net/21.15107/rcub_vinar_8736
ER  - 

@conference{
author = "Barjaktarević, Dragana and Dimić, Ivana and Cvijović-Alagić, Ivana and Đokić, Veljko and Rakin, Marko",
year = "2018",
publisher = "Belgrade : Serbian Academy of Sciences and Arts",
journal = "Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructu",
title = "Morphology of Nanotubular Oxide Layer Formation on Titanium and Titanium Alloy Using Electrochemical Anodization",
pages = "162-160",
url = "https://hdl.handle.net/21.15107/rcub_vinar_8736"
}

Barjaktarević, D., Dimić, I., Cvijović-Alagić, I., Đokić, V.,& Rakin, M.. (2018). Morphology of Nanotubular Oxide Layer Formation on Titanium and Titanium Alloy Using Electrochemical Anodization. in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructu
Belgrade : Serbian Academy of Sciences and Arts., 160-162.
https://hdl.handle.net/21.15107/rcub_vinar_8736

Barjaktarević D, Dimić I, Cvijović-Alagić I, Đokić V, Rakin M. Morphology of Nanotubular Oxide Layer Formation on Titanium and Titanium Alloy Using Electrochemical Anodization. in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructu. 2018;:160-162.
https://hdl.handle.net/21.15107/rcub_vinar_8736 .

Barjaktarević, Dragana, Dimić, Ivana, Cvijović-Alagić, Ivana, Đokić, Veljko, Rakin, Marko, "Morphology of Nanotubular Oxide Layer Formation on Titanium and Titanium Alloy Using Electrochemical Anodization" in Program and Book of Abstracts / First International Conference on Electron Microscopy of Nanostructu (2018):160-162,
https://hdl.handle.net/21.15107/rcub_vinar_8736 .