TY  - JOUR
AU  - Miličić Lazić, Minja
AU  - Mitić, Dijana
AU  - Radović, Katarina
AU  - Đorđević, Igor
AU  - Majerič, Peter
AU  - Rudolf, Rebeka
AU  - Grgur, Branimir N.
PY  - 2024
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7189
AB  - Variations in the corrosion behavior of biomedical NiTi alloys in Cl− containing and acidic environments present a problem with their biological implantation. The objective of this research was to evaluate the synergy of the microstructure, the corrosion behavior, and the biocompatibility of novel continuous-cast NiTi alloys and to compare them with commercial NiTi alloys. The two alloys have a practically identical nominal chemical composition, but they differ in production technology. The continuous casting technology involved vacuum induction melting of the basic components and vertical continuous casting, while the commercial NiTi alloy was produced through a process of casting, hot rolling, and forming into square shapes. The microstructure was revealed to determine the surface area and size of grains. The corrosion of a commercial nickel–titanium alloy and one prepared by a novel continuous casting method in acidic and chloride-containing solutions was studied via analytical and electrochemical tests. Localized corrosion characteristics related to oxide properties, when exposed to 9 g L−1 NaCl solution, were examined with focused ion beam analysis and subsequent microchemical analysis of the formed corrosive products. Corrosion potential over time and the oxide film resistance were analyzed using linear polarization measurements. To obtain a preliminary estimate of biocompatibility, human fibroblast cells were used in indirect contact, i.e., alloy conditioning medium. The continuous casting method resulted in a reduction in the average grain size in comparison to the commercial sample and better corrosion stability of the sample in an acidic environment. Also, in a solution of 9 g L−1 NaCl the commercial sample showed high values for the corrosion current density (jcorr = 6 μA cm−2), which indicated low corrosion resistance, while the continuous casting sample possessed much better corrosion stability and lower values for the corrosion current density (jcorr = 0.2 μA cm−2). In line with that, elemental analysis of the corroded surfaces showed higher Cl− ion deposition over the surface layer of the commercial sample, suggesting local oxide breakdown. Moreover, NiTicc reached a value three times higher for polarization resistance (Rp = 270 kΩ cm2) over time in comparison to the commercial sample (Rp~100 kΩ cm2). Biocompatibility evaluation showed that human fibroblast cells exhibited altered metabolic activity. An MTT assay showed that cells’ mitochondrial activity dropped below that of control cells in the presence of both materials’ supernatants.
PB  - MDPI
T2  - Metals
T1  - Corrosion Behavior of Nickel–Titanium Continuous-Casted Alloys
IS  - 1
SP  - 88
VL  - 14
DO  - 10.3390/met14010088
ER  - 

@article{
author = "Miličić Lazić, Minja and Mitić, Dijana and Radović, Katarina and Đorđević, Igor and Majerič, Peter and Rudolf, Rebeka and Grgur, Branimir N.",
year = "2024",
abstract = "Variations in the corrosion behavior of biomedical NiTi alloys in Cl− containing and acidic environments present a problem with their biological implantation. The objective of this research was to evaluate the synergy of the microstructure, the corrosion behavior, and the biocompatibility of novel continuous-cast NiTi alloys and to compare them with commercial NiTi alloys. The two alloys have a practically identical nominal chemical composition, but they differ in production technology. The continuous casting technology involved vacuum induction melting of the basic components and vertical continuous casting, while the commercial NiTi alloy was produced through a process of casting, hot rolling, and forming into square shapes. The microstructure was revealed to determine the surface area and size of grains. The corrosion of a commercial nickel–titanium alloy and one prepared by a novel continuous casting method in acidic and chloride-containing solutions was studied via analytical and electrochemical tests. Localized corrosion characteristics related to oxide properties, when exposed to 9 g L−1 NaCl solution, were examined with focused ion beam analysis and subsequent microchemical analysis of the formed corrosive products. Corrosion potential over time and the oxide film resistance were analyzed using linear polarization measurements. To obtain a preliminary estimate of biocompatibility, human fibroblast cells were used in indirect contact, i.e., alloy conditioning medium. The continuous casting method resulted in a reduction in the average grain size in comparison to the commercial sample and better corrosion stability of the sample in an acidic environment. Also, in a solution of 9 g L−1 NaCl the commercial sample showed high values for the corrosion current density (jcorr = 6 μA cm−2), which indicated low corrosion resistance, while the continuous casting sample possessed much better corrosion stability and lower values for the corrosion current density (jcorr = 0.2 μA cm−2). In line with that, elemental analysis of the corroded surfaces showed higher Cl− ion deposition over the surface layer of the commercial sample, suggesting local oxide breakdown. Moreover, NiTicc reached a value three times higher for polarization resistance (Rp = 270 kΩ cm2) over time in comparison to the commercial sample (Rp~100 kΩ cm2). Biocompatibility evaluation showed that human fibroblast cells exhibited altered metabolic activity. An MTT assay showed that cells’ mitochondrial activity dropped below that of control cells in the presence of both materials’ supernatants.",
publisher = "MDPI",
journal = "Metals",
title = "Corrosion Behavior of Nickel–Titanium Continuous-Casted Alloys",
number = "1",
pages = "88",
volume = "14",
doi = "10.3390/met14010088"
}

Miličić Lazić, M., Mitić, D., Radović, K., Đorđević, I., Majerič, P., Rudolf, R.,& Grgur, B. N.. (2024). Corrosion Behavior of Nickel–Titanium Continuous-Casted Alloys. in Metals
MDPI., 14(1), 88.
https://doi.org/10.3390/met14010088

Miličić Lazić M, Mitić D, Radović K, Đorđević I, Majerič P, Rudolf R, Grgur BN. Corrosion Behavior of Nickel–Titanium Continuous-Casted Alloys. in Metals. 2024;14(1):88.
doi:10.3390/met14010088 .

Miličić Lazić, Minja, Mitić, Dijana, Radović, Katarina, Đorđević, Igor, Majerič, Peter, Rudolf, Rebeka, Grgur, Branimir N., "Corrosion Behavior of Nickel–Titanium Continuous-Casted Alloys" in Metals, 14, no. 1 (2024):88,
https://doi.org/10.3390/met14010088 . .

TY  - JOUR
AU  - Stamenković, Dejan
AU  - Popović, Miljana
AU  - Rudolf, Rebeka
AU  - Zrilić, Milorad
AU  - Raić, Karlo
AU  - Obradović Đuričić, Kosovka
AU  - Stamenković, Dragoslav
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6377
AB  - Since additive technologies in dentistry are gradually replacing metal casting technology, it is necessary to evaluate new dental constructions intended for the development of removable partial denture frameworks. The aim of this research was to evaluate the microstructure and mechanical properties of 3D-printed, laser-melted and -sintered Co–Cr alloys, and perform a comparative study with Co–Cr castings for the same dental purposes. The experiments were divided into two groups. The first group consisted of samples produced by conventional casting of the Co–Cr alloy. The second group consisted of 3D-printed, laser-melted and -sintered specimens produced from a Co–Cr alloy powder divided into three subgroups, depending on the technological parameters chosen for manufacturing (angle, location and heat treatment). Examination of the microstructure was carried out by classical metallographic sample preparation, using optical microscopy and scanning electron microscopy with energy dispersive X-ray spectroscopy (EDX) analysis. A structural phase analysis was also performed by XRD. The mechanical properties were determined using a standard tensile test. The microstructure observation showed a dendritic character in the case of castings, while in the case of 3D-printed, laser-melted and -sintered Co–Cr alloys, the microstructure was typical for additive technologies. The XRD phase analysis confirmed the presence of Co–Cr phases (ε and γ). The results of the tensile test showed remarkably higher yield and tensile strength values and slightly lower elongation of the 3D-printed, laser-melted and -sintered samples than those produced by conventional casting.
PB  - MDPI
T2  - Materials
T1  - Comparative Study of the Microstructure and Properties of Cast-Fabricated and 3D-Printed Laser-Sintered Co–Cr Alloys for Removable Partial Denture Frameworks
IS  - 8
SP  - 3267
VL  - 16
DO  - 10.3390/ma16083267
ER  - 

@article{
author = "Stamenković, Dejan and Popović, Miljana and Rudolf, Rebeka and Zrilić, Milorad and Raić, Karlo and Obradović Đuričić, Kosovka and Stamenković, Dragoslav",
year = "2023",
abstract = "Since additive technologies in dentistry are gradually replacing metal casting technology, it is necessary to evaluate new dental constructions intended for the development of removable partial denture frameworks. The aim of this research was to evaluate the microstructure and mechanical properties of 3D-printed, laser-melted and -sintered Co–Cr alloys, and perform a comparative study with Co–Cr castings for the same dental purposes. The experiments were divided into two groups. The first group consisted of samples produced by conventional casting of the Co–Cr alloy. The second group consisted of 3D-printed, laser-melted and -sintered specimens produced from a Co–Cr alloy powder divided into three subgroups, depending on the technological parameters chosen for manufacturing (angle, location and heat treatment). Examination of the microstructure was carried out by classical metallographic sample preparation, using optical microscopy and scanning electron microscopy with energy dispersive X-ray spectroscopy (EDX) analysis. A structural phase analysis was also performed by XRD. The mechanical properties were determined using a standard tensile test. The microstructure observation showed a dendritic character in the case of castings, while in the case of 3D-printed, laser-melted and -sintered Co–Cr alloys, the microstructure was typical for additive technologies. The XRD phase analysis confirmed the presence of Co–Cr phases (ε and γ). The results of the tensile test showed remarkably higher yield and tensile strength values and slightly lower elongation of the 3D-printed, laser-melted and -sintered samples than those produced by conventional casting.",
publisher = "MDPI",
journal = "Materials",
title = "Comparative Study of the Microstructure and Properties of Cast-Fabricated and 3D-Printed Laser-Sintered Co–Cr Alloys for Removable Partial Denture Frameworks",
number = "8",
pages = "3267",
volume = "16",
doi = "10.3390/ma16083267"
}

Stamenković, D., Popović, M., Rudolf, R., Zrilić, M., Raić, K., Obradović Đuričić, K.,& Stamenković, D.. (2023). Comparative Study of the Microstructure and Properties of Cast-Fabricated and 3D-Printed Laser-Sintered Co–Cr Alloys for Removable Partial Denture Frameworks. in Materials
MDPI., 16(8), 3267.
https://doi.org/10.3390/ma16083267

Stamenković D, Popović M, Rudolf R, Zrilić M, Raić K, Obradović Đuričić K, Stamenković D. Comparative Study of the Microstructure and Properties of Cast-Fabricated and 3D-Printed Laser-Sintered Co–Cr Alloys for Removable Partial Denture Frameworks. in Materials. 2023;16(8):3267.
doi:10.3390/ma16083267 .

Stamenković, Dejan, Popović, Miljana, Rudolf, Rebeka, Zrilić, Milorad, Raić, Karlo, Obradović Đuričić, Kosovka, Stamenković, Dragoslav, "Comparative Study of the Microstructure and Properties of Cast-Fabricated and 3D-Printed Laser-Sintered Co–Cr Alloys for Removable Partial Denture Frameworks" in Materials, 16, no. 8 (2023):3267,
https://doi.org/10.3390/ma16083267 . .

TY  - JOUR
AU  - Rudolf, Rebeka
AU  - Majerič, Peter
AU  - Lazić, Vojkan
AU  - Grgur, Branimir
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5219
AB  - In this paper, we present the idea and development of a new gold-copper-zinc-germanium (AuCuZnGe) alloy, which is related to the method of production and research of its key properties, so that the new Au alloy could be used for jewelry production and in dental technology. The research design was associated with the determination of appropriate chemical composition, manufacturing technology, and performing the characterization. Melting and casting technologies were used to cast the AuCuZnGe alloy while rolling was used to prepare the cylinders and cutting to make square plates with a = 10 mm and thickness of 1 mm. Such plates were provided for corrosion testing. Observation of the plate′s microstructure was performed with Scanning Electron Microscopy (SEM) equipped by Energy-Dispersive X-ray spectrometry (EDS) and X-ray diffraction (XRD). Corrosion testing involved performing the following measurements: Polarization, the open circuit potentials, and linear polarization resistance. Based on the SEM, EDS, XRD, and results of corrosion testing it can be concluded that the new AuCuZnGe alloy possesses high corrosion stability and can be classified as a high noble alloy.
PB  - MDPI
T2  - Metals
T1  - Development of a New AuCuZnGe Alloy and Determination of Its Corrosion Properties
IS  - 8
SP  - 1284
VL  - 12
DO  - 10.3390/met12081284
ER  - 

@article{
author = "Rudolf, Rebeka and Majerič, Peter and Lazić, Vojkan and Grgur, Branimir",
year = "2022",
abstract = "In this paper, we present the idea and development of a new gold-copper-zinc-germanium (AuCuZnGe) alloy, which is related to the method of production and research of its key properties, so that the new Au alloy could be used for jewelry production and in dental technology. The research design was associated with the determination of appropriate chemical composition, manufacturing technology, and performing the characterization. Melting and casting technologies were used to cast the AuCuZnGe alloy while rolling was used to prepare the cylinders and cutting to make square plates with a = 10 mm and thickness of 1 mm. Such plates were provided for corrosion testing. Observation of the plate′s microstructure was performed with Scanning Electron Microscopy (SEM) equipped by Energy-Dispersive X-ray spectrometry (EDS) and X-ray diffraction (XRD). Corrosion testing involved performing the following measurements: Polarization, the open circuit potentials, and linear polarization resistance. Based on the SEM, EDS, XRD, and results of corrosion testing it can be concluded that the new AuCuZnGe alloy possesses high corrosion stability and can be classified as a high noble alloy.",
publisher = "MDPI",
journal = "Metals",
title = "Development of a New AuCuZnGe Alloy and Determination of Its Corrosion Properties",
number = "8",
pages = "1284",
volume = "12",
doi = "10.3390/met12081284"
}

Rudolf, R., Majerič, P., Lazić, V.,& Grgur, B.. (2022). Development of a New AuCuZnGe Alloy and Determination of Its Corrosion Properties. in Metals
MDPI., 12(8), 1284.
https://doi.org/10.3390/met12081284

Rudolf R, Majerič P, Lazić V, Grgur B. Development of a New AuCuZnGe Alloy and Determination of Its Corrosion Properties. in Metals. 2022;12(8):1284.
doi:10.3390/met12081284 .

Rudolf, Rebeka, Majerič, Peter, Lazić, Vojkan, Grgur, Branimir, "Development of a New AuCuZnGe Alloy and Determination of Its Corrosion Properties" in Metals, 12, no. 8 (2022):1284,
https://doi.org/10.3390/met12081284 . .

TY  - JOUR
AU  - Grgur, Branimir
AU  - Lazic, Vojkan
AU  - Stojic, Dragana
AU  - Rudolf, Rebeka
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4887
AB  - Platinum and nine commercial dental alloys with the contents of noble metals ranging from 27 wt.% to 97.6 wt. % were investigated by the procedure described in the Standard ISO 10271:2009, Electrochemical testing was performed in an argon purged solution of 0.9 % NaCl at pH = 7.2. The obtained values of the characteristic determined parameters of the alloys with different noble metal content, treating only Au, Pt, and Pd as noble, were compared with the American Dental Association (ADA) classification system. Based on the obtained results, the considered noble metal dental alloys were classified into three groups.
T2  - Corrosion Science
T1  - Electrochemical testing of noble metal dental alloys: The influence of their chemical composition on the corrosion resistance
VL  - 184
DO  - 10.1016/j.corsci.2021.109412
ER  - 

@article{
author = "Grgur, Branimir and Lazic, Vojkan and Stojic, Dragana and Rudolf, Rebeka",
year = "2021",
abstract = "Platinum and nine commercial dental alloys with the contents of noble metals ranging from 27 wt.% to 97.6 wt. % were investigated by the procedure described in the Standard ISO 10271:2009, Electrochemical testing was performed in an argon purged solution of 0.9 % NaCl at pH = 7.2. The obtained values of the characteristic determined parameters of the alloys with different noble metal content, treating only Au, Pt, and Pd as noble, were compared with the American Dental Association (ADA) classification system. Based on the obtained results, the considered noble metal dental alloys were classified into three groups.",
journal = "Corrosion Science",
title = "Electrochemical testing of noble metal dental alloys: The influence of their chemical composition on the corrosion resistance",
volume = "184",
doi = "10.1016/j.corsci.2021.109412"
}

Grgur, B., Lazic, V., Stojic, D.,& Rudolf, R.. (2021). Electrochemical testing of noble metal dental alloys: The influence of their chemical composition on the corrosion resistance. in Corrosion Science, 184.
https://doi.org/10.1016/j.corsci.2021.109412

Grgur B, Lazic V, Stojic D, Rudolf R. Electrochemical testing of noble metal dental alloys: The influence of their chemical composition on the corrosion resistance. in Corrosion Science. 2021;184.
doi:10.1016/j.corsci.2021.109412 .

Grgur, Branimir, Lazic, Vojkan, Stojic, Dragana, Rudolf, Rebeka, "Electrochemical testing of noble metal dental alloys: The influence of their chemical composition on the corrosion resistance" in Corrosion Science, 184 (2021),
https://doi.org/10.1016/j.corsci.2021.109412 . .

TY  - JOUR
AU  - Čolić, Miodrag
AU  - Dzopalić, Tanja
AU  - Tomić, Sergej
AU  - Rajković, Jelena
AU  - Rudolf, Rebeka
AU  - Vuković, Goran D.
AU  - Marinković, Aleksandar
AU  - Uskoković, Petar
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2782
AB  - The protocols for the preparation of dendritic cells (DCs) as cancer vaccines based on stimulation of Toll-like receptors (TLRs) are very promising. In this study we covalently attached 7-thia-8-oxoguanosine (7-TOG), a selective endosomal TLR7, to previously oxidized multi-walled carbon nanotubes (o-MWCNTs) (mass ratio 1:5.6, respectively), and tested their ability to activate human monocyte-derived (Mo)DCs. Light, confocal and transmission electron microscopy confirmed efficient phagocytosis of 7-TOG-MWCNTs by MoDCs and their efficient delivery to TLR7(+) endosomes. The biocompatibility studies showed that 7-TOG-MWCNTs, at concentrations lower than 100 mu g/ml, were not cytotoxic for MoDCs. 7-TOG-MV/CNTs (50 mu g/ml) up-regulated CD86 expression, allostimulatory activity, T helper (Th)1- and Th17-polarizing capability of MoDCs. The same concentration of soluble 7-TOG, alone or in combination with control o-MWCNTs, did not have such effects. It can be hypothesized that the efficacy of 7-TOG-MWCNTs in stimulating MoDCs was a consequence of increased intracellular concentration of 7-TOG after internalization of the nano-complexes, because similar Th-polarizing capability could be induced with 10-times higher concentrations of soluble 7-TOG. In conclusion, our results suggest that functionalized MWCNTs may be a promising system for the delivery of drugs to intracellular targets, in order to improve the immunogenic potential of DCs for therapeutic purposes.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Carbon
T1  - Immunomodulatory effects of carbon nanotubes functionalized with a Toll-like receptor 7 agonist on human dendritic cells
EP  - 287
SP  - 273
VL  - 67
DO  - 10.1016/j.carbon.2013.09.090
ER  - 

@article{
author = "Čolić, Miodrag and Dzopalić, Tanja and Tomić, Sergej and Rajković, Jelena and Rudolf, Rebeka and Vuković, Goran D. and Marinković, Aleksandar and Uskoković, Petar",
year = "2014",
abstract = "The protocols for the preparation of dendritic cells (DCs) as cancer vaccines based on stimulation of Toll-like receptors (TLRs) are very promising. In this study we covalently attached 7-thia-8-oxoguanosine (7-TOG), a selective endosomal TLR7, to previously oxidized multi-walled carbon nanotubes (o-MWCNTs) (mass ratio 1:5.6, respectively), and tested their ability to activate human monocyte-derived (Mo)DCs. Light, confocal and transmission electron microscopy confirmed efficient phagocytosis of 7-TOG-MWCNTs by MoDCs and their efficient delivery to TLR7(+) endosomes. The biocompatibility studies showed that 7-TOG-MWCNTs, at concentrations lower than 100 mu g/ml, were not cytotoxic for MoDCs. 7-TOG-MV/CNTs (50 mu g/ml) up-regulated CD86 expression, allostimulatory activity, T helper (Th)1- and Th17-polarizing capability of MoDCs. The same concentration of soluble 7-TOG, alone or in combination with control o-MWCNTs, did not have such effects. It can be hypothesized that the efficacy of 7-TOG-MWCNTs in stimulating MoDCs was a consequence of increased intracellular concentration of 7-TOG after internalization of the nano-complexes, because similar Th-polarizing capability could be induced with 10-times higher concentrations of soluble 7-TOG. In conclusion, our results suggest that functionalized MWCNTs may be a promising system for the delivery of drugs to intracellular targets, in order to improve the immunogenic potential of DCs for therapeutic purposes.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Carbon",
title = "Immunomodulatory effects of carbon nanotubes functionalized with a Toll-like receptor 7 agonist on human dendritic cells",
pages = "287-273",
volume = "67",
doi = "10.1016/j.carbon.2013.09.090"
}

Čolić, M., Dzopalić, T., Tomić, S., Rajković, J., Rudolf, R., Vuković, G. D., Marinković, A.,& Uskoković, P.. (2014). Immunomodulatory effects of carbon nanotubes functionalized with a Toll-like receptor 7 agonist on human dendritic cells. in Carbon
Pergamon-Elsevier Science Ltd, Oxford., 67, 273-287.
https://doi.org/10.1016/j.carbon.2013.09.090

Čolić M, Dzopalić T, Tomić S, Rajković J, Rudolf R, Vuković GD, Marinković A, Uskoković P. Immunomodulatory effects of carbon nanotubes functionalized with a Toll-like receptor 7 agonist on human dendritic cells. in Carbon. 2014;67:273-287.
doi:10.1016/j.carbon.2013.09.090 .

Čolić, Miodrag, Dzopalić, Tanja, Tomić, Sergej, Rajković, Jelena, Rudolf, Rebeka, Vuković, Goran D., Marinković, Aleksandar, Uskoković, Petar, "Immunomodulatory effects of carbon nanotubes functionalized with a Toll-like receptor 7 agonist on human dendritic cells" in Carbon, 67 (2014):273-287,
https://doi.org/10.1016/j.carbon.2013.09.090 . .

TY  - JOUR
AU  - Milinković, Iva
AU  - Rudolf, Rebeka
AU  - Raić, Karlo T.
AU  - Aleksić, Zoran
AU  - Lazić, Vojkan
AU  - Todorović, Aleksandar
AU  - Stamenković, Dragoslav
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5667
AB  - The shape and chemical composition, as well as the macro- and microtopography, of an implant surface have been studied widely as the major factors that positively influence implant osseointegration. Titanium and titanium alloys have been used extensively over the past 20 years as biomedical materials in orthopedic and dental surgery because of their good mechanical properties, corrosion resistance, no cell toxicity, and very poor inflammatory response in pen-implant tissue, which confirms their high biocompatibility. Their favorable biological performance is attributed to a thin native oxide film that forms spontaneously on the titanium surface. It is well established that surface roughness plays an important role in implant fixation. Accordingly, some authors have indicated the existence of an optimal range of surface roughness. The titanium surface can be either chemically or physically modified, or both, in order to improve biomaterial tissue integration. Different treatments are used to modify the titanium surface. Hydroxyapatite coatings, preceded or not by acid etching, are used to create a rough, potentially bioactive surface. Oxide blasting treatments, either with or without chemical etching, are used to develop rough surfaces. Thick oxide films obtained by anodic or thermal oxidation have been used to accelerate the osseointegration process. The ideal microtopography of the surface is still unknown, however, because it is very difficult to associate surface properties with clinical results. As more accurate knowledge is required, several Ti surfaces have been analyzed and the endosseous implant surface modified on the micro level has been thoroughly studied. Additionally, the production of gold (Au) nanoparticles to be added to the micron-scale modified surface has been performed. In this respect, an appropriate overview of our results is given.
PB  - Institute of Metals and Technology
T2  - Materiali in Tehnologije
T1  - Aspects of titanium-implant surface modification at the micro and nano levels
EP  - 256
IS  - 3
SP  - 251
VL  - 46
UR  - https://hdl.handle.net/21.15107/rcub_smile_1680
ER  - 

@article{
author = "Milinković, Iva and Rudolf, Rebeka and Raić, Karlo T. and Aleksić, Zoran and Lazić, Vojkan and Todorović, Aleksandar and Stamenković, Dragoslav",
year = "2012",
abstract = "The shape and chemical composition, as well as the macro- and microtopography, of an implant surface have been studied widely as the major factors that positively influence implant osseointegration. Titanium and titanium alloys have been used extensively over the past 20 years as biomedical materials in orthopedic and dental surgery because of their good mechanical properties, corrosion resistance, no cell toxicity, and very poor inflammatory response in pen-implant tissue, which confirms their high biocompatibility. Their favorable biological performance is attributed to a thin native oxide film that forms spontaneously on the titanium surface. It is well established that surface roughness plays an important role in implant fixation. Accordingly, some authors have indicated the existence of an optimal range of surface roughness. The titanium surface can be either chemically or physically modified, or both, in order to improve biomaterial tissue integration. Different treatments are used to modify the titanium surface. Hydroxyapatite coatings, preceded or not by acid etching, are used to create a rough, potentially bioactive surface. Oxide blasting treatments, either with or without chemical etching, are used to develop rough surfaces. Thick oxide films obtained by anodic or thermal oxidation have been used to accelerate the osseointegration process. The ideal microtopography of the surface is still unknown, however, because it is very difficult to associate surface properties with clinical results. As more accurate knowledge is required, several Ti surfaces have been analyzed and the endosseous implant surface modified on the micro level has been thoroughly studied. Additionally, the production of gold (Au) nanoparticles to be added to the micron-scale modified surface has been performed. In this respect, an appropriate overview of our results is given.",
publisher = "Institute of Metals and Technology",
journal = "Materiali in Tehnologije",
title = "Aspects of titanium-implant surface modification at the micro and nano levels",
pages = "256-251",
number = "3",
volume = "46",
url = "https://hdl.handle.net/21.15107/rcub_smile_1680"
}

Milinković, I., Rudolf, R., Raić, K. T., Aleksić, Z., Lazić, V., Todorović, A.,& Stamenković, D.. (2012). Aspects of titanium-implant surface modification at the micro and nano levels. in Materiali in Tehnologije
Institute of Metals and Technology., 46(3), 251-256.
https://hdl.handle.net/21.15107/rcub_smile_1680

Milinković I, Rudolf R, Raić KT, Aleksić Z, Lazić V, Todorović A, Stamenković D. Aspects of titanium-implant surface modification at the micro and nano levels. in Materiali in Tehnologije. 2012;46(3):251-256.
https://hdl.handle.net/21.15107/rcub_smile_1680 .

Milinković, Iva, Rudolf, Rebeka, Raić, Karlo T., Aleksić, Zoran, Lazić, Vojkan, Todorović, Aleksandar, Stamenković, Dragoslav, "Aspects of titanium-implant surface modification at the micro and nano levels" in Materiali in Tehnologije, 46, no. 3 (2012):251-256,
https://hdl.handle.net/21.15107/rcub_smile_1680 .

TY  - JOUR
AU  - Raić, Karlo T.
AU  - Rudolf, Rebeka
AU  - Ternik, Primoz
AU  - Zunić, Zoran
AU  - Lazić, Vojkan
AU  - Stamenković, Dragoslav
AU  - Tanasković, Tatjana
AU  - Anžel, Ivan
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5628
AB  - This work presents the possibility of numerical modelling using Computational Fluid Dynamics (CFD) in the field of nano-foils. The governing equations were solved using a Finite Volume Methodology (FVM). The computational domain was discretized using a uniform Cartesian grid with the appropriate mesh size along the x and y directions employing the corresponding number of grid points. The field variables were discretized at the cell centres and the spatial, as well as the time, derivatives were approximated using the second-order accurate numerical scheme. The time-evolution of the temperature and concentration fields, as well as the atomic diffusion coefficient, will be presented for the appropriate Al-Au nano-foil geometry and boundary conditions.
PB  - Institute of Metals and Technology
T2  - Materiali in Tehnologije
T1  - CFD analysis of exothermic reactions in al-au nano multi-layered foils
EP  - 338
IS  - 4
SP  - 335
VL  - 45
UR  - https://hdl.handle.net/21.15107/rcub_smile_1642
ER  - 

@article{
author = "Raić, Karlo T. and Rudolf, Rebeka and Ternik, Primoz and Zunić, Zoran and Lazić, Vojkan and Stamenković, Dragoslav and Tanasković, Tatjana and Anžel, Ivan",
year = "2011",
abstract = "This work presents the possibility of numerical modelling using Computational Fluid Dynamics (CFD) in the field of nano-foils. The governing equations were solved using a Finite Volume Methodology (FVM). The computational domain was discretized using a uniform Cartesian grid with the appropriate mesh size along the x and y directions employing the corresponding number of grid points. The field variables were discretized at the cell centres and the spatial, as well as the time, derivatives were approximated using the second-order accurate numerical scheme. The time-evolution of the temperature and concentration fields, as well as the atomic diffusion coefficient, will be presented for the appropriate Al-Au nano-foil geometry and boundary conditions.",
publisher = "Institute of Metals and Technology",
journal = "Materiali in Tehnologije",
title = "CFD analysis of exothermic reactions in al-au nano multi-layered foils",
pages = "338-335",
number = "4",
volume = "45",
url = "https://hdl.handle.net/21.15107/rcub_smile_1642"
}

Raić, K. T., Rudolf, R., Ternik, P., Zunić, Z., Lazić, V., Stamenković, D., Tanasković, T.,& Anžel, I.. (2011). CFD analysis of exothermic reactions in al-au nano multi-layered foils. in Materiali in Tehnologije
Institute of Metals and Technology., 45(4), 335-338.
https://hdl.handle.net/21.15107/rcub_smile_1642

Raić KT, Rudolf R, Ternik P, Zunić Z, Lazić V, Stamenković D, Tanasković T, Anžel I. CFD analysis of exothermic reactions in al-au nano multi-layered foils. in Materiali in Tehnologije. 2011;45(4):335-338.
https://hdl.handle.net/21.15107/rcub_smile_1642 .

Raić, Karlo T., Rudolf, Rebeka, Ternik, Primoz, Zunić, Zoran, Lazić, Vojkan, Stamenković, Dragoslav, Tanasković, Tatjana, Anžel, Ivan, "CFD analysis of exothermic reactions in al-au nano multi-layered foils" in Materiali in Tehnologije, 45, no. 4 (2011):335-338,
https://hdl.handle.net/21.15107/rcub_smile_1642 .

TY  - JOUR
AU  - Raić, Karlo T.
AU  - Rudolf, Rebeka
AU  - Todorović, Aleksandar
AU  - Stamenković, Dragoslav
AU  - Anžel, Ivan
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5603
AB  - Metal-ceramic fusing has been the essential step in obtaining materials that benefit from both ceramic and metal constituents. i e where the combined properties of metal and ceramic layers are desirable When considering fusing methods. soldering and active metal brazing are the most effective These processes involve braze melting and flowing between the two pieces of material In the first part the phenomena occurring on the boundary between the ceramics and the active filler metal during the metal-ceramics joining are discussed Three interconnected sub-processes are considered (1) wetting of the ceramic surface. (2) chemical reactions at the Interlace and (3) diffusion with a moving interface Then, the appearances at the grain boundary grooves of the ceramic surface are presented as phenomena on the catalytic surface In the second pan, examples from dental practice and jewellery manufacturing are used for comparative analysis Finally we discuss the composition and properties of the soldering and brazing alloys used for dental practice and jewellery manufacturing
PB  - Institute of Metals and Technology
T2  - Materiali in Tehnologije
T1  - Liquid metal/ceramic interfaces in dental practice and jewellery manufacturing
EP  - 66
IS  - 2
SP  - 59
VL  - 44
UR  - https://hdl.handle.net/21.15107/rcub_smile_1534
ER  - 

@article{
author = "Raić, Karlo T. and Rudolf, Rebeka and Todorović, Aleksandar and Stamenković, Dragoslav and Anžel, Ivan",
year = "2010",
abstract = "Metal-ceramic fusing has been the essential step in obtaining materials that benefit from both ceramic and metal constituents. i e where the combined properties of metal and ceramic layers are desirable When considering fusing methods. soldering and active metal brazing are the most effective These processes involve braze melting and flowing between the two pieces of material In the first part the phenomena occurring on the boundary between the ceramics and the active filler metal during the metal-ceramics joining are discussed Three interconnected sub-processes are considered (1) wetting of the ceramic surface. (2) chemical reactions at the Interlace and (3) diffusion with a moving interface Then, the appearances at the grain boundary grooves of the ceramic surface are presented as phenomena on the catalytic surface In the second pan, examples from dental practice and jewellery manufacturing are used for comparative analysis Finally we discuss the composition and properties of the soldering and brazing alloys used for dental practice and jewellery manufacturing",
publisher = "Institute of Metals and Technology",
journal = "Materiali in Tehnologije",
title = "Liquid metal/ceramic interfaces in dental practice and jewellery manufacturing",
pages = "66-59",
number = "2",
volume = "44",
url = "https://hdl.handle.net/21.15107/rcub_smile_1534"
}

Raić, K. T., Rudolf, R., Todorović, A., Stamenković, D.,& Anžel, I.. (2010). Liquid metal/ceramic interfaces in dental practice and jewellery manufacturing. in Materiali in Tehnologije
Institute of Metals and Technology., 44(2), 59-66.
https://hdl.handle.net/21.15107/rcub_smile_1534

Raić KT, Rudolf R, Todorović A, Stamenković D, Anžel I. Liquid metal/ceramic interfaces in dental practice and jewellery manufacturing. in Materiali in Tehnologije. 2010;44(2):59-66.
https://hdl.handle.net/21.15107/rcub_smile_1534 .

Raić, Karlo T., Rudolf, Rebeka, Todorović, Aleksandar, Stamenković, Dragoslav, Anžel, Ivan, "Liquid metal/ceramic interfaces in dental practice and jewellery manufacturing" in Materiali in Tehnologije, 44, no. 2 (2010):59-66,
https://hdl.handle.net/21.15107/rcub_smile_1534 .

TY  - JOUR
AU  - Raić, Karlo T.
AU  - Rudolf, Rebeka
AU  - Kosec, Borut
AU  - Anžel, Ivan
AU  - Lazić, Vojkan
AU  - Todorović, Aleksandar
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5605
AB  - This paper describes the development of novel, reactive Al-Au nano-multilayered foils, their possible application in different fields and a discussion of the nano-foils' suitability for dental and jewellery applications. Moreover, this study includes the rapid joining of similar and dissimilar materials, by placing multilayer nano-foils and two layers of solder or braze. The foils precisely control the instantaneous release of heat energy for the joining and act as a controllable local heat source. The reactive foils' thickness is in the range 10 nm to less than 100 nm and they contain many nanoscale layers that alternate between materials with high mixing heats, such as Al and Au. The foil between the two solder/braze layers melts the solder/braze with the heat generated by the reaction and bonds the components. The use of reactive foils eliminates the need for a furnace and dramatically increases the soldering/brazing heating rate of the components being bonded. Thus, ceramics and metals can be fused over required areas without the thermal stresses that are encountered in furnace soldering or brazing. In addition, a completely new plasma technology is proposed for the manufacturing of nano-foils and the first results of the preliminary experimental testing are presented.
PB  - Institute of Metals and Technology
T2  - Materiali in Tehnologije
T1  - Nanofoils for soldering and brazing in dental joining practice and jewellery manufacturing
EP  - 9
IS  - 1
SP  - 3
VL  - 43
UR  - https://hdl.handle.net/21.15107/rcub_smile_1560
ER  - 

@article{
author = "Raić, Karlo T. and Rudolf, Rebeka and Kosec, Borut and Anžel, Ivan and Lazić, Vojkan and Todorović, Aleksandar",
year = "2010",
abstract = "This paper describes the development of novel, reactive Al-Au nano-multilayered foils, their possible application in different fields and a discussion of the nano-foils' suitability for dental and jewellery applications. Moreover, this study includes the rapid joining of similar and dissimilar materials, by placing multilayer nano-foils and two layers of solder or braze. The foils precisely control the instantaneous release of heat energy for the joining and act as a controllable local heat source. The reactive foils' thickness is in the range 10 nm to less than 100 nm and they contain many nanoscale layers that alternate between materials with high mixing heats, such as Al and Au. The foil between the two solder/braze layers melts the solder/braze with the heat generated by the reaction and bonds the components. The use of reactive foils eliminates the need for a furnace and dramatically increases the soldering/brazing heating rate of the components being bonded. Thus, ceramics and metals can be fused over required areas without the thermal stresses that are encountered in furnace soldering or brazing. In addition, a completely new plasma technology is proposed for the manufacturing of nano-foils and the first results of the preliminary experimental testing are presented.",
publisher = "Institute of Metals and Technology",
journal = "Materiali in Tehnologije",
title = "Nanofoils for soldering and brazing in dental joining practice and jewellery manufacturing",
pages = "9-3",
number = "1",
volume = "43",
url = "https://hdl.handle.net/21.15107/rcub_smile_1560"
}

Raić, K. T., Rudolf, R., Kosec, B., Anžel, I., Lazić, V.,& Todorović, A.. (2010). Nanofoils for soldering and brazing in dental joining practice and jewellery manufacturing. in Materiali in Tehnologije
Institute of Metals and Technology., 43(1), 3-9.
https://hdl.handle.net/21.15107/rcub_smile_1560

Raić KT, Rudolf R, Kosec B, Anžel I, Lazić V, Todorović A. Nanofoils for soldering and brazing in dental joining practice and jewellery manufacturing. in Materiali in Tehnologije. 2010;43(1):3-9.
https://hdl.handle.net/21.15107/rcub_smile_1560 .

Raić, Karlo T., Rudolf, Rebeka, Kosec, Borut, Anžel, Ivan, Lazić, Vojkan, Todorović, Aleksandar, "Nanofoils for soldering and brazing in dental joining practice and jewellery manufacturing" in Materiali in Tehnologije, 43, no. 1 (2010):3-9,
https://hdl.handle.net/21.15107/rcub_smile_1560 .

TY  - JOUR
AU  - Ćirić, Radovan
AU  - Čantrak, Svetislav
AU  - Raić, Karlo T.
AU  - Rudolf, Rebeka
AU  - Anžel, Ivan
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5555
AB  - The paper presents the viscoplastic phenomena observed during the rotational friction-welding process of high-speed steel M2 (AISI SAE) with carbon steel 1060 (AISI SAE The structure, phase composition and distribution of the carbide phase in the friction plane and adjoining zones are examined by using optical microscopy (OM) with a system for quantitative analysis, and scanning electron microscopy (SEM) in addition to EDS analysis. The experimentally-checked mathematical relationship is suggested for the calculation of the radial movements of the carbide phase, immediately next to the friction plane. On the basis of qualitative and quantitative evaluation of the microstructural and rheological appearances, a model of carbide phase distribution is also established in the viscoplastic and viscous layers in the area of the friction plane.
PB  - Korean Institute of Metals and Materials
T2  - Metals and Materials International
T1  - Distribution of the carbide phase in the viscoplastic layer during the rotational friction-welding of various steels
EP  - 841
IS  - 5
SP  - 831
VL  - 15
DO  - 10.1007/s12540-009-0831-4
ER  - 

@article{
author = "Ćirić, Radovan and Čantrak, Svetislav and Raić, Karlo T. and Rudolf, Rebeka and Anžel, Ivan",
year = "2009",
abstract = "The paper presents the viscoplastic phenomena observed during the rotational friction-welding process of high-speed steel M2 (AISI SAE) with carbon steel 1060 (AISI SAE The structure, phase composition and distribution of the carbide phase in the friction plane and adjoining zones are examined by using optical microscopy (OM) with a system for quantitative analysis, and scanning electron microscopy (SEM) in addition to EDS analysis. The experimentally-checked mathematical relationship is suggested for the calculation of the radial movements of the carbide phase, immediately next to the friction plane. On the basis of qualitative and quantitative evaluation of the microstructural and rheological appearances, a model of carbide phase distribution is also established in the viscoplastic and viscous layers in the area of the friction plane.",
publisher = "Korean Institute of Metals and Materials",
journal = "Metals and Materials International",
title = "Distribution of the carbide phase in the viscoplastic layer during the rotational friction-welding of various steels",
pages = "841-831",
number = "5",
volume = "15",
doi = "10.1007/s12540-009-0831-4"
}

Ćirić, R., Čantrak, S., Raić, K. T., Rudolf, R.,& Anžel, I.. (2009). Distribution of the carbide phase in the viscoplastic layer during the rotational friction-welding of various steels. in Metals and Materials International
Korean Institute of Metals and Materials., 15(5), 831-841.
https://doi.org/10.1007/s12540-009-0831-4

Ćirić R, Čantrak S, Raić KT, Rudolf R, Anžel I. Distribution of the carbide phase in the viscoplastic layer during the rotational friction-welding of various steels. in Metals and Materials International. 2009;15(5):831-841.
doi:10.1007/s12540-009-0831-4 .

Ćirić, Radovan, Čantrak, Svetislav, Raić, Karlo T., Rudolf, Rebeka, Anžel, Ivan, "Distribution of the carbide phase in the viscoplastic layer during the rotational friction-welding of various steels" in Metals and Materials International, 15, no. 5 (2009):831-841,
https://doi.org/10.1007/s12540-009-0831-4 . .