TY  - JOUR
AU  - Stojanović, Dušica
AU  - Brajović, Ljiljana
AU  - Obradović, Vera
AU  - Mijailović, Daniel
AU  - Dramlić, Dragan
AU  - Kojović, Aleksandar
AU  - Uskoković, Petar
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4454
AB  - The composite nanofibers were used as reinforcement in acrylic polymer for the overall enhancement of thermo-mechanical properties, adhesion between fibers and matrix, and fracture toughness of the final nanocomposite since acrylic materials lack of this feature. So, a good balance between hardness/toughness and transparency is obtained with the addition of poly (vinyl butyral) (PVB) and titania (TiO2) nanofibers simultaneously and controlling their contents. Specifically, when compared to that of pure acrylic polymer, the fracture toughness of the PMMA nanocomposite apparently increased 55% with the addition of 3 wt.% titania nanoparticles, while the produced nanocomposite maintained high transmittance above 75-80% in the visible domain. The transmission spectrum modelling of the reinforced fiber materials and hybrid acrylic composites using Mie scattering theory for different particle sizes and particle content is presented. The calculated transmission coefficients versus wavelength are compared with the experimental ones.
PB  - Elsevier B.V.
T2  - Progress in Organic Coatings
T1  - Hybrid acrylic nanocomposites with excellent transparency and hardness/toughness balance
SP  - 105437
VL  - 139
DO  - 10.1016/j.porgcoat.2019.105437
ER  - 

@article{
author = "Stojanović, Dušica and Brajović, Ljiljana and Obradović, Vera and Mijailović, Daniel and Dramlić, Dragan and Kojović, Aleksandar and Uskoković, Petar",
year = "2020",
abstract = "The composite nanofibers were used as reinforcement in acrylic polymer for the overall enhancement of thermo-mechanical properties, adhesion between fibers and matrix, and fracture toughness of the final nanocomposite since acrylic materials lack of this feature. So, a good balance between hardness/toughness and transparency is obtained with the addition of poly (vinyl butyral) (PVB) and titania (TiO2) nanofibers simultaneously and controlling their contents. Specifically, when compared to that of pure acrylic polymer, the fracture toughness of the PMMA nanocomposite apparently increased 55% with the addition of 3 wt.% titania nanoparticles, while the produced nanocomposite maintained high transmittance above 75-80% in the visible domain. The transmission spectrum modelling of the reinforced fiber materials and hybrid acrylic composites using Mie scattering theory for different particle sizes and particle content is presented. The calculated transmission coefficients versus wavelength are compared with the experimental ones.",
publisher = "Elsevier B.V.",
journal = "Progress in Organic Coatings",
title = "Hybrid acrylic nanocomposites with excellent transparency and hardness/toughness balance",
pages = "105437",
volume = "139",
doi = "10.1016/j.porgcoat.2019.105437"
}

Stojanović, D., Brajović, L., Obradović, V., Mijailović, D., Dramlić, D., Kojović, A.,& Uskoković, P.. (2020). Hybrid acrylic nanocomposites with excellent transparency and hardness/toughness balance. in Progress in Organic Coatings
Elsevier B.V.., 139, 105437.
https://doi.org/10.1016/j.porgcoat.2019.105437

Stojanović D, Brajović L, Obradović V, Mijailović D, Dramlić D, Kojović A, Uskoković P. Hybrid acrylic nanocomposites with excellent transparency and hardness/toughness balance. in Progress in Organic Coatings. 2020;139:105437.
doi:10.1016/j.porgcoat.2019.105437 .

Stojanović, Dušica, Brajović, Ljiljana, Obradović, Vera, Mijailović, Daniel, Dramlić, Dragan, Kojović, Aleksandar, Uskoković, Petar, "Hybrid acrylic nanocomposites with excellent transparency and hardness/toughness balance" in Progress in Organic Coatings, 139 (2020):105437,
https://doi.org/10.1016/j.porgcoat.2019.105437 . .

TY  - JOUR
AU  - Milanović, Predrag
AU  - Vuksanović, Marija M.
AU  - Mitrić, Miodrag
AU  - Stojanović, Dušica
AU  - Kojović, Aleksandar
AU  - Rogan, Jelena
AU  - Jančić-Heinemann, Radmila
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4033
AB  - It is well known that alumina possesses good mechanical and chemical properties. Nanofibers having alpha - alumina structure was used as reinforcement for metal, polymer and ceramic matrix composites. In this study, three series of nanofibers were prepared. The first series was made from 10 % water solution of the aluminium chloride hydroxide/polyvinyl alcohol with a mass ratio of 5: 1. The other two series were made with the addition of 1 wt.% of MgCl2 or 1 wt.% of FeCl3 regarding the aluminium chloride hydroxide content. Nanofibers were prepared using the electrospinning technique and they were characterized by the TGA/DTA, XRD and FESEM methods. It was proven that addition of FeCl3 into the initial spinning solution lowers the temperature for the corundum structure formation while the addition of MgCl2 results if the formation of mixed oxides that eases the sintering process.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Electrospun Alumina Fibers Doped With Ferric and Magnesium Oxides
EP  - 83
IS  - 1
SP  - 77
VL  - 50
DO  - 10.2298/SOS1801077M
ER  - 

@article{
author = "Milanović, Predrag and Vuksanović, Marija M. and Mitrić, Miodrag and Stojanović, Dušica and Kojović, Aleksandar and Rogan, Jelena and Jančić-Heinemann, Radmila",
year = "2018",
abstract = "It is well known that alumina possesses good mechanical and chemical properties. Nanofibers having alpha - alumina structure was used as reinforcement for metal, polymer and ceramic matrix composites. In this study, three series of nanofibers were prepared. The first series was made from 10 % water solution of the aluminium chloride hydroxide/polyvinyl alcohol with a mass ratio of 5: 1. The other two series were made with the addition of 1 wt.% of MgCl2 or 1 wt.% of FeCl3 regarding the aluminium chloride hydroxide content. Nanofibers were prepared using the electrospinning technique and they were characterized by the TGA/DTA, XRD and FESEM methods. It was proven that addition of FeCl3 into the initial spinning solution lowers the temperature for the corundum structure formation while the addition of MgCl2 results if the formation of mixed oxides that eases the sintering process.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Electrospun Alumina Fibers Doped With Ferric and Magnesium Oxides",
pages = "83-77",
number = "1",
volume = "50",
doi = "10.2298/SOS1801077M"
}

Milanović, P., Vuksanović, M. M., Mitrić, M., Stojanović, D., Kojović, A., Rogan, J.,& Jančić-Heinemann, R.. (2018). Electrospun Alumina Fibers Doped With Ferric and Magnesium Oxides. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 50(1), 77-83.
https://doi.org/10.2298/SOS1801077M

Milanović P, Vuksanović MM, Mitrić M, Stojanović D, Kojović A, Rogan J, Jančić-Heinemann R. Electrospun Alumina Fibers Doped With Ferric and Magnesium Oxides. in Science of Sintering. 2018;50(1):77-83.
doi:10.2298/SOS1801077M .

Milanović, Predrag, Vuksanović, Marija M., Mitrić, Miodrag, Stojanović, Dušica, Kojović, Aleksandar, Rogan, Jelena, Jančić-Heinemann, Radmila, "Electrospun Alumina Fibers Doped With Ferric and Magnesium Oxides" in Science of Sintering, 50, no. 1 (2018):77-83,
https://doi.org/10.2298/SOS1801077M . .

TY  - JOUR
AU  - Milanović, Predrag
AU  - Vuksanović, Marija M.
AU  - Mitrić, Miodrag
AU  - Kojović, Aleksandar
AU  - Mijin, Dušan
AU  - Jančić-Heinemann, Radmila
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3911
AB  - Ferric oxide doped alumina particles were prepared via the sol-gel method and their performance as Reactive Orange 16 adsorbent was evaluated. The concentrations of the Reactive Orange 16 were monitored using a UV-Vis spectrophotometer. The effect of Reactive Orange 16 concentration, adsorbent quantity and pH on the solution decolorization efficiency was analyzed. The efficiency of the Reactive Orange 16 removal using ferric oxide alumina doped exceeded 98 % in 20 min at pH=3. The experimental data were fitted to the Langmuir equation better than to the Freundlich one. The pseudo-first-order model fits well with the experimental data for adsorption kinetics.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Alumina Particles Doped With Ferric as Efficient Adsorbent for Removal of Reactive Orange 16 from Aqueous Solutions
EP  - 476
IS  - 4
SP  - 467
VL  - 50
DO  - 10.2298/SOS1804467M
ER  - 

@article{
author = "Milanović, Predrag and Vuksanović, Marija M. and Mitrić, Miodrag and Kojović, Aleksandar and Mijin, Dušan and Jančić-Heinemann, Radmila",
year = "2018",
abstract = "Ferric oxide doped alumina particles were prepared via the sol-gel method and their performance as Reactive Orange 16 adsorbent was evaluated. The concentrations of the Reactive Orange 16 were monitored using a UV-Vis spectrophotometer. The effect of Reactive Orange 16 concentration, adsorbent quantity and pH on the solution decolorization efficiency was analyzed. The efficiency of the Reactive Orange 16 removal using ferric oxide alumina doped exceeded 98 % in 20 min at pH=3. The experimental data were fitted to the Langmuir equation better than to the Freundlich one. The pseudo-first-order model fits well with the experimental data for adsorption kinetics.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Alumina Particles Doped With Ferric as Efficient Adsorbent for Removal of Reactive Orange 16 from Aqueous Solutions",
pages = "476-467",
number = "4",
volume = "50",
doi = "10.2298/SOS1804467M"
}

Milanović, P., Vuksanović, M. M., Mitrić, M., Kojović, A., Mijin, D.,& Jančić-Heinemann, R.. (2018). Alumina Particles Doped With Ferric as Efficient Adsorbent for Removal of Reactive Orange 16 from Aqueous Solutions. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 50(4), 467-476.
https://doi.org/10.2298/SOS1804467M

Milanović P, Vuksanović MM, Mitrić M, Kojović A, Mijin D, Jančić-Heinemann R. Alumina Particles Doped With Ferric as Efficient Adsorbent for Removal of Reactive Orange 16 from Aqueous Solutions. in Science of Sintering. 2018;50(4):467-476.
doi:10.2298/SOS1804467M .

Milanović, Predrag, Vuksanović, Marija M., Mitrić, Miodrag, Kojović, Aleksandar, Mijin, Dušan, Jančić-Heinemann, Radmila, "Alumina Particles Doped With Ferric as Efficient Adsorbent for Removal of Reactive Orange 16 from Aqueous Solutions" in Science of Sintering, 50, no. 4 (2018):467-476,
https://doi.org/10.2298/SOS1804467M . .

TY  - JOUR
AU  - Radović, Ivana M.
AU  - Stojanović, Dušica
AU  - Kojović, Aleksandar
AU  - Petrović, Miloš
AU  - Uskoković, Petar
AU  - Radojević, Vesna
AU  - Aleksić, Radoslav
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3592
AB  - The study presents a novel method for the protection of Grubbs' catalyst, by incorporation in polystyrene fibres via electrospinning technique. Epoxy-glass fibre composite with embedded self-healing agents (polystyrene fibres with Grubbs' and microcapsules with dicyclopentadiene) was processed. Fibres retained pale purple colour during processing, revealing that fibres provided good protection of the catalyst from the amine hardener. The influence of self-healing agents' content and thermal treatment on self-healing efficiency was investigated. Fourier transform infrared spectroscopy revealed that a polydicyclopentadiene formed at the healed interface. Thermal analysis revealed that bleed' at the healing sites from different samples had similar concentration of polydicyclopentadiene, indicating that the same amount of the catalyst has been provided to dicyclopentadiene for polymerization. This finding lead to assumption that electrospun polymer fibres enabled good dispersion of the catalyst in the composites. The low energy impact tests of the samples showed a recovery of 90% after 24h at room temperature and up to 111% after repeated heating cycles.
PB  - Sage Publications Ltd, London
T2  - Journal of Composite Materials
T1  - Healing efficiency of polystyrene electrospun nanofibers with Grubbs' catalyst in thermosetting composite
EP  - 3016
IS  - 21
SP  - 3003
VL  - 51
DO  - 10.1177/0021998316681832
ER  - 

@article{
author = "Radović, Ivana M. and Stojanović, Dušica and Kojović, Aleksandar and Petrović, Miloš and Uskoković, Petar and Radojević, Vesna and Aleksić, Radoslav",
year = "2017",
abstract = "The study presents a novel method for the protection of Grubbs' catalyst, by incorporation in polystyrene fibres via electrospinning technique. Epoxy-glass fibre composite with embedded self-healing agents (polystyrene fibres with Grubbs' and microcapsules with dicyclopentadiene) was processed. Fibres retained pale purple colour during processing, revealing that fibres provided good protection of the catalyst from the amine hardener. The influence of self-healing agents' content and thermal treatment on self-healing efficiency was investigated. Fourier transform infrared spectroscopy revealed that a polydicyclopentadiene formed at the healed interface. Thermal analysis revealed that bleed' at the healing sites from different samples had similar concentration of polydicyclopentadiene, indicating that the same amount of the catalyst has been provided to dicyclopentadiene for polymerization. This finding lead to assumption that electrospun polymer fibres enabled good dispersion of the catalyst in the composites. The low energy impact tests of the samples showed a recovery of 90% after 24h at room temperature and up to 111% after repeated heating cycles.",
publisher = "Sage Publications Ltd, London",
journal = "Journal of Composite Materials",
title = "Healing efficiency of polystyrene electrospun nanofibers with Grubbs' catalyst in thermosetting composite",
pages = "3016-3003",
number = "21",
volume = "51",
doi = "10.1177/0021998316681832"
}

Radović, I. M., Stojanović, D., Kojović, A., Petrović, M., Uskoković, P., Radojević, V.,& Aleksić, R.. (2017). Healing efficiency of polystyrene electrospun nanofibers with Grubbs' catalyst in thermosetting composite. in Journal of Composite Materials
Sage Publications Ltd, London., 51(21), 3003-3016.
https://doi.org/10.1177/0021998316681832

Radović IM, Stojanović D, Kojović A, Petrović M, Uskoković P, Radojević V, Aleksić R. Healing efficiency of polystyrene electrospun nanofibers with Grubbs' catalyst in thermosetting composite. in Journal of Composite Materials. 2017;51(21):3003-3016.
doi:10.1177/0021998316681832 .

Radović, Ivana M., Stojanović, Dušica, Kojović, Aleksandar, Petrović, Miloš, Uskoković, Petar, Radojević, Vesna, Aleksić, Radoslav, "Healing efficiency of polystyrene electrospun nanofibers with Grubbs' catalyst in thermosetting composite" in Journal of Composite Materials, 51, no. 21 (2017):3003-3016,
https://doi.org/10.1177/0021998316681832 . .

TY  - JOUR
AU  - Radović, Ivana M.
AU  - Stojanović, Dušica
AU  - Kojović, Aleksandar
AU  - Petrović, Miloš
AU  - Uskoković, Petar
AU  - Radojević, Vesna
AU  - Aleksić, Radoslav
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3719
AB  - The study presents a novel method for protection of the first- and the second-generation Grubbs' catalyst, by incorporation in poly(styrene) fibers through electrospinning technique. Both catalysts are sensitive to the presence of the amine hardeners in the epoxy-based self-healing composites and require protection from deactivation to retain their ability to promote polymerization reaction of the healing agent. Comparison of healing efficiencies of both catalysts suggested that poly(styrene) fibers offer better protection and dispersion for the first-generation Grubbs' catalyst, although all the samples exhibited high-healing efficiency. Difference in stereoselectivity between two catalysts was also indicated. [GRAPHICS] .
PB  - Taylor & Francis Inc, Philadelphia
T2  - Polymer-Plastics Technology and Engineering
T1  - Electrospun Poly(styrene) Fibers as a Protection for the First- and the Second-Generation Grubbs' Catalyst
EP  - 1195
IS  - 11
SP  - 1188
VL  - 56
DO  - 10.1080/03602559.2016.1260734
ER  - 

@article{
author = "Radović, Ivana M. and Stojanović, Dušica and Kojović, Aleksandar and Petrović, Miloš and Uskoković, Petar and Radojević, Vesna and Aleksić, Radoslav",
year = "2017",
abstract = "The study presents a novel method for protection of the first- and the second-generation Grubbs' catalyst, by incorporation in poly(styrene) fibers through electrospinning technique. Both catalysts are sensitive to the presence of the amine hardeners in the epoxy-based self-healing composites and require protection from deactivation to retain their ability to promote polymerization reaction of the healing agent. Comparison of healing efficiencies of both catalysts suggested that poly(styrene) fibers offer better protection and dispersion for the first-generation Grubbs' catalyst, although all the samples exhibited high-healing efficiency. Difference in stereoselectivity between two catalysts was also indicated. [GRAPHICS] .",
publisher = "Taylor & Francis Inc, Philadelphia",
journal = "Polymer-Plastics Technology and Engineering",
title = "Electrospun Poly(styrene) Fibers as a Protection for the First- and the Second-Generation Grubbs' Catalyst",
pages = "1195-1188",
number = "11",
volume = "56",
doi = "10.1080/03602559.2016.1260734"
}

Radović, I. M., Stojanović, D., Kojović, A., Petrović, M., Uskoković, P., Radojević, V.,& Aleksić, R.. (2017). Electrospun Poly(styrene) Fibers as a Protection for the First- and the Second-Generation Grubbs' Catalyst. in Polymer-Plastics Technology and Engineering
Taylor & Francis Inc, Philadelphia., 56(11), 1188-1195.
https://doi.org/10.1080/03602559.2016.1260734

Radović IM, Stojanović D, Kojović A, Petrović M, Uskoković P, Radojević V, Aleksić R. Electrospun Poly(styrene) Fibers as a Protection for the First- and the Second-Generation Grubbs' Catalyst. in Polymer-Plastics Technology and Engineering. 2017;56(11):1188-1195.
doi:10.1080/03602559.2016.1260734 .

Radović, Ivana M., Stojanović, Dušica, Kojović, Aleksandar, Petrović, Miloš, Uskoković, Petar, Radojević, Vesna, Aleksić, Radoslav, "Electrospun Poly(styrene) Fibers as a Protection for the First- and the Second-Generation Grubbs' Catalyst" in Polymer-Plastics Technology and Engineering, 56, no. 11 (2017):1188-1195,
https://doi.org/10.1080/03602559.2016.1260734 . .

TY  - JOUR
AU  - Alzarrug, Faisal Ali
AU  - Stojanović, Dušica
AU  - Obradović, Vera
AU  - Kojović, Aleksandar
AU  - Nedeljković, Jovan
AU  - Rajilić-Stojanović, Mirjana
AU  - Uskoković, Petar
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3707
AB  - Titania nanofillers were used to reinforce nanofibers in composite mats produced by electrospinning of poly(vinyl butyral) with two different concentrations of polymers. The titania nanoparticles and titania nanotubes were added into an acetic acid/ethanol solution in different contents of 3 and 1wt%, respectively. The effect of the processing system on the morphology of the produced fibers was analyzed. The antimicrobial poly(vinyl butyral) composite fibers with titanium dioxide nanoparticles and titanium dioxide nanotubes were produced by single and multineedle electrospinning systems. This study reports fabrication of composite nanofibrous mats with significant mechanical and antimicrobial properties at a high production speed, which is promising for commercial applications (health care, photocatalysis, protective clothing, etc.). The reported result revealed an outstanding correlation between values of elastic modulus derived from nanoindentation and dynamic mechanical techniques.
PB  - Wiley, Hoboken
T2  - Polymers for Advanced Technologies
T1  - Multiscale characterization of antimicrobial poly(vinyl butyral)/titania nanofibrous composites
EP  - 914
IS  - 7
SP  - 909
VL  - 28
DO  - 10.1002/pat.3996
ER  - 

@article{
author = "Alzarrug, Faisal Ali and Stojanović, Dušica and Obradović, Vera and Kojović, Aleksandar and Nedeljković, Jovan and Rajilić-Stojanović, Mirjana and Uskoković, Petar",
year = "2017",
abstract = "Titania nanofillers were used to reinforce nanofibers in composite mats produced by electrospinning of poly(vinyl butyral) with two different concentrations of polymers. The titania nanoparticles and titania nanotubes were added into an acetic acid/ethanol solution in different contents of 3 and 1wt%, respectively. The effect of the processing system on the morphology of the produced fibers was analyzed. The antimicrobial poly(vinyl butyral) composite fibers with titanium dioxide nanoparticles and titanium dioxide nanotubes were produced by single and multineedle electrospinning systems. This study reports fabrication of composite nanofibrous mats with significant mechanical and antimicrobial properties at a high production speed, which is promising for commercial applications (health care, photocatalysis, protective clothing, etc.). The reported result revealed an outstanding correlation between values of elastic modulus derived from nanoindentation and dynamic mechanical techniques.",
publisher = "Wiley, Hoboken",
journal = "Polymers for Advanced Technologies",
title = "Multiscale characterization of antimicrobial poly(vinyl butyral)/titania nanofibrous composites",
pages = "914-909",
number = "7",
volume = "28",
doi = "10.1002/pat.3996"
}

Alzarrug, F. A., Stojanović, D., Obradović, V., Kojović, A., Nedeljković, J., Rajilić-Stojanović, M.,& Uskoković, P.. (2017). Multiscale characterization of antimicrobial poly(vinyl butyral)/titania nanofibrous composites. in Polymers for Advanced Technologies
Wiley, Hoboken., 28(7), 909-914.
https://doi.org/10.1002/pat.3996

Alzarrug FA, Stojanović D, Obradović V, Kojović A, Nedeljković J, Rajilić-Stojanović M, Uskoković P. Multiscale characterization of antimicrobial poly(vinyl butyral)/titania nanofibrous composites. in Polymers for Advanced Technologies. 2017;28(7):909-914.
doi:10.1002/pat.3996 .

Alzarrug, Faisal Ali, Stojanović, Dušica, Obradović, Vera, Kojović, Aleksandar, Nedeljković, Jovan, Rajilić-Stojanović, Mirjana, Uskoković, Petar, "Multiscale characterization of antimicrobial poly(vinyl butyral)/titania nanofibrous composites" in Polymers for Advanced Technologies, 28, no. 7 (2017):909-914,
https://doi.org/10.1002/pat.3996 . .

TY  - JOUR
AU  - Petrović, Miloš
AU  - Mihailović, Peđa
AU  - Brajović, Ljiljana
AU  - Petricević, Slobodan
AU  - Živković, Irena
AU  - Kojović, Aleksandar
AU  - Radojević, Vesna
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3471
AB  - In this paper, the use of intrinsic intensity fiber-optic sensors for structural health monitoring was investigated. Polyethylene-based composite samples with glass mat reinforcement and embedded telecommunication fibers were subjected to impact using high-speed puncture impact tester as a calibration device. Transfer function of the sensor was generated by linking the light intensity modulation depth with the impact force and the impact point to fiber distance. Conditions for transfer function validity were presented. To detect any possible dangerous impact, a net of crossed fibers was proposed and the net spacing for the given material was calculated. Appropriate non-damaging calibration procedure was proposed, as well as the algorithm for locating the impact point. The method for calculating the impact force, the projectile momentum change, and the place of impact was verified by consecutive strikes on the previously calibrated sample. The sensor can also provide information on the time of the impact and an alarm signal if the force exceeds the damaging threshold force.
PB  - IEEE-Inst Electrical Electronics Engineers Inc, Piscataway
T2  - IEEE Sensors Journal
T1  - Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester
EP  - 3053
IS  - 9
SP  - 3047
VL  - 16
DO  - 10.1109/JSEN.2016.2524045
ER  - 

@article{
author = "Petrović, Miloš and Mihailović, Peđa and Brajović, Ljiljana and Petricević, Slobodan and Živković, Irena and Kojović, Aleksandar and Radojević, Vesna",
year = "2016",
abstract = "In this paper, the use of intrinsic intensity fiber-optic sensors for structural health monitoring was investigated. Polyethylene-based composite samples with glass mat reinforcement and embedded telecommunication fibers were subjected to impact using high-speed puncture impact tester as a calibration device. Transfer function of the sensor was generated by linking the light intensity modulation depth with the impact force and the impact point to fiber distance. Conditions for transfer function validity were presented. To detect any possible dangerous impact, a net of crossed fibers was proposed and the net spacing for the given material was calculated. Appropriate non-damaging calibration procedure was proposed, as well as the algorithm for locating the impact point. The method for calculating the impact force, the projectile momentum change, and the place of impact was verified by consecutive strikes on the previously calibrated sample. The sensor can also provide information on the time of the impact and an alarm signal if the force exceeds the damaging threshold force.",
publisher = "IEEE-Inst Electrical Electronics Engineers Inc, Piscataway",
journal = "IEEE Sensors Journal",
title = "Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester",
pages = "3053-3047",
number = "9",
volume = "16",
doi = "10.1109/JSEN.2016.2524045"
}

Petrović, M., Mihailović, P., Brajović, L., Petricević, S., Živković, I., Kojović, A.,& Radojević, V.. (2016). Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester. in IEEE Sensors Journal
IEEE-Inst Electrical Electronics Engineers Inc, Piscataway., 16(9), 3047-3053.
https://doi.org/10.1109/JSEN.2016.2524045

Petrović M, Mihailović P, Brajović L, Petricević S, Živković I, Kojović A, Radojević V. Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester. in IEEE Sensors Journal. 2016;16(9):3047-3053.
doi:10.1109/JSEN.2016.2524045 .

Petrović, Miloš, Mihailović, Peđa, Brajović, Ljiljana, Petricević, Slobodan, Živković, Irena, Kojović, Aleksandar, Radojević, Vesna, "Intensity Fiber-Optic Sensor for Structural Health Monitoring Calibrated by Impact Tester" in IEEE Sensors Journal, 16, no. 9 (2016):3047-3053,
https://doi.org/10.1109/JSEN.2016.2524045 . .

TY  - JOUR
AU  - Yerro, Omar
AU  - Radojević, Vesna
AU  - Radović, Ivana
AU  - Kojović, Aleksandar
AU  - Uskoković, Petar
AU  - Stojanović, Dušica
AU  - Aleksić, Radoslav
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3247
AB  - The acrylic resin reinforced with silanized alumina whiskers with self-healing (SH) agents was synthesized. The self-healing system consisted of microcapsules with the healing agent dicyclopentadiene (DCPD) and modified Grubbs' catalyst in PS electrospun nanofibers. The content of alumina whiskers was 3% w/w, and the concentration of PS fibers and OF microcapsules in the samples were 1% wow each. The embedded silanized alumina whiskers achieved higher T-g and absorbed impact energy in relation to unmodified alumina whiskers. The nanoindentation test revealed the reduced modulus increased for about 65% and hardness increased is about 90% for composites with silanized whiskers. Cracks were induced on the composite surface using the low energy impact test machine. The self-healing efficiency of 74% was approved by the repeated impact test after 96 h.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Enhanced thermo-mechanical properties of acrylic resin reinforced with silanized alumina whiskers
EP  - 10786
IS  - 9
SP  - 10779
VL  - 42
DO  - 10.1016/j.ceramint.2016.03.205
ER  - 

@article{
author = "Yerro, Omar and Radojević, Vesna and Radović, Ivana and Kojović, Aleksandar and Uskoković, Petar and Stojanović, Dušica and Aleksić, Radoslav",
year = "2016",
abstract = "The acrylic resin reinforced with silanized alumina whiskers with self-healing (SH) agents was synthesized. The self-healing system consisted of microcapsules with the healing agent dicyclopentadiene (DCPD) and modified Grubbs' catalyst in PS electrospun nanofibers. The content of alumina whiskers was 3% w/w, and the concentration of PS fibers and OF microcapsules in the samples were 1% wow each. The embedded silanized alumina whiskers achieved higher T-g and absorbed impact energy in relation to unmodified alumina whiskers. The nanoindentation test revealed the reduced modulus increased for about 65% and hardness increased is about 90% for composites with silanized whiskers. Cracks were induced on the composite surface using the low energy impact test machine. The self-healing efficiency of 74% was approved by the repeated impact test after 96 h.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Enhanced thermo-mechanical properties of acrylic resin reinforced with silanized alumina whiskers",
pages = "10786-10779",
number = "9",
volume = "42",
doi = "10.1016/j.ceramint.2016.03.205"
}

Yerro, O., Radojević, V., Radović, I., Kojović, A., Uskoković, P., Stojanović, D.,& Aleksić, R.. (2016). Enhanced thermo-mechanical properties of acrylic resin reinforced with silanized alumina whiskers. in Ceramics International
Elsevier Sci Ltd, Oxford., 42(9), 10779-10786.
https://doi.org/10.1016/j.ceramint.2016.03.205

Yerro O, Radojević V, Radović I, Kojović A, Uskoković P, Stojanović D, Aleksić R. Enhanced thermo-mechanical properties of acrylic resin reinforced with silanized alumina whiskers. in Ceramics International. 2016;42(9):10779-10786.
doi:10.1016/j.ceramint.2016.03.205 .

Yerro, Omar, Radojević, Vesna, Radović, Ivana, Kojović, Aleksandar, Uskoković, Petar, Stojanović, Dušica, Aleksić, Radoslav, "Enhanced thermo-mechanical properties of acrylic resin reinforced with silanized alumina whiskers" in Ceramics International, 42, no. 9 (2016):10779-10786,
https://doi.org/10.1016/j.ceramint.2016.03.205 . .

TY  - JOUR
AU  - Simić, Danica
AU  - Stojanović, Dušica
AU  - Kojović, Aleksandar
AU  - Dimić, Mirjana
AU  - Totovski, Ljubica
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3301
AB  - The subject of this research is to explore the possibility of preparation of nanocomposite material of improved thermo-mechanical and tribological properties, using inorganic fullerene-like tungsten disulfide nanostructures (IF-WS2) as reinforcement in poly(vinyl butyral) (PVB). This paper also reports investigation of the effects of using different solvents in preparation of PVB/IF-WS2 nanocomposite on the thermo-mechanical behavior of the resulting material. PVB was dissolved in ethanol, isopropanol, n-butanol and ethyl acetate. IF-WS2 nanoparticles were added to these PVB solutions and dispersed by different deagglomeration techniques. Samples were dried and thin films were obtained. Their microstructure and the quality of IF-WS2 dispersion and deagglomeration in PVE matrix was analyzed by scanning electron microscope (SEM). The reinforcing effect of IF-WS2 is examined by determining hardness, reduced modulus of elasticity and coefficient of friction, by nanoindentation and nanoscratch test, in terms of the different solvents applied in preparation of the samples, mode of stirring and different contents of IF-WS2. The glass transition temperature (T-g) was determined for the prepared samples using differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMA). Storage modulus and mechanical loss factor were observed in a defined temperature range using DMA.
PB  - Elsevier Science Sa, Lausanne
T2  - Materials Chemistry and Physics
T1  - Inorganic fullerene-like IF-WS2/PVB nanocomposites of improved thermo-mechanical and tribological properties
EP  - 344
SP  - 335
VL  - 184
DO  - 10.1016/j.matchemphys.2016.09.060
ER  - 

@article{
author = "Simić, Danica and Stojanović, Dušica and Kojović, Aleksandar and Dimić, Mirjana and Totovski, Ljubica and Uskoković, Petar and Aleksić, Radoslav",
year = "2016",
abstract = "The subject of this research is to explore the possibility of preparation of nanocomposite material of improved thermo-mechanical and tribological properties, using inorganic fullerene-like tungsten disulfide nanostructures (IF-WS2) as reinforcement in poly(vinyl butyral) (PVB). This paper also reports investigation of the effects of using different solvents in preparation of PVB/IF-WS2 nanocomposite on the thermo-mechanical behavior of the resulting material. PVB was dissolved in ethanol, isopropanol, n-butanol and ethyl acetate. IF-WS2 nanoparticles were added to these PVB solutions and dispersed by different deagglomeration techniques. Samples were dried and thin films were obtained. Their microstructure and the quality of IF-WS2 dispersion and deagglomeration in PVE matrix was analyzed by scanning electron microscope (SEM). The reinforcing effect of IF-WS2 is examined by determining hardness, reduced modulus of elasticity and coefficient of friction, by nanoindentation and nanoscratch test, in terms of the different solvents applied in preparation of the samples, mode of stirring and different contents of IF-WS2. The glass transition temperature (T-g) was determined for the prepared samples using differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMA). Storage modulus and mechanical loss factor were observed in a defined temperature range using DMA.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Materials Chemistry and Physics",
title = "Inorganic fullerene-like IF-WS2/PVB nanocomposites of improved thermo-mechanical and tribological properties",
pages = "344-335",
volume = "184",
doi = "10.1016/j.matchemphys.2016.09.060"
}

Simić, D., Stojanović, D., Kojović, A., Dimić, M., Totovski, L., Uskoković, P.,& Aleksić, R.. (2016). Inorganic fullerene-like IF-WS2/PVB nanocomposites of improved thermo-mechanical and tribological properties. in Materials Chemistry and Physics
Elsevier Science Sa, Lausanne., 184, 335-344.
https://doi.org/10.1016/j.matchemphys.2016.09.060

Simić D, Stojanović D, Kojović A, Dimić M, Totovski L, Uskoković P, Aleksić R. Inorganic fullerene-like IF-WS2/PVB nanocomposites of improved thermo-mechanical and tribological properties. in Materials Chemistry and Physics. 2016;184:335-344.
doi:10.1016/j.matchemphys.2016.09.060 .

Simić, Danica, Stojanović, Dušica, Kojović, Aleksandar, Dimić, Mirjana, Totovski, Ljubica, Uskoković, Petar, Aleksić, Radoslav, "Inorganic fullerene-like IF-WS2/PVB nanocomposites of improved thermo-mechanical and tribological properties" in Materials Chemistry and Physics, 184 (2016):335-344,
https://doi.org/10.1016/j.matchemphys.2016.09.060 . .

TY  - JOUR
AU  - Grković, Mirjana
AU  - Stojanović, Dušica
AU  - Kojović, Aleksandar
AU  - Strnad, Simona
AU  - Kreže, Tatjana
AU  - Aleksić, Radoslav
AU  - Uskoković, Petar
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3068
AB  - Polyethylene oxide (PEO) functionalized graphene (f-G) was prepared by ultrasonication of pristine graphene in PEO aqueous solution. The feasible sonication protocol of PEO degradation and graphene functionalization enabled fabrication of solvent cast nanocomposites. Additionally, the steps to form new bio-nanocomposite films have been described. Taking the advantage of the combination of graphene, PEO and keratin fibers from poultry feather waste, the aforementioned bio-nanocomposite films were designed with extraordinary properties allowing the films to have promising applications as eventual packaging materials and enabling bio-waste keratin to be converted into value-added materials. Compared to neat PEO, addition of only 0.3 wt% f-G provided an increase of 92% to the storage modulus. These findings are similar to the nanoindentation results, which yielded increases in the reduced modulus of the same composition by about 92%. Nanoindentation testing shows that the incorporation of 0.3 wt% f-G increased the reduced modulus and hardness of the keratin-PEO blend by about 155 and 99%, respectively.
PB  - Royal Society of Chemistry
T2  - RSC Advances
T1  - Keratin-polyethylene oxide bio-nanocomposites reinforced with ultrasonically functionalized graphene
EP  - 91287
IS  - 111
SP  - 91280
VL  - 5
DO  - 10.1039/c5ra12402f
ER  - 

@article{
author = "Grković, Mirjana and Stojanović, Dušica and Kojović, Aleksandar and Strnad, Simona and Kreže, Tatjana and Aleksić, Radoslav and Uskoković, Petar",
year = "2015",
abstract = "Polyethylene oxide (PEO) functionalized graphene (f-G) was prepared by ultrasonication of pristine graphene in PEO aqueous solution. The feasible sonication protocol of PEO degradation and graphene functionalization enabled fabrication of solvent cast nanocomposites. Additionally, the steps to form new bio-nanocomposite films have been described. Taking the advantage of the combination of graphene, PEO and keratin fibers from poultry feather waste, the aforementioned bio-nanocomposite films were designed with extraordinary properties allowing the films to have promising applications as eventual packaging materials and enabling bio-waste keratin to be converted into value-added materials. Compared to neat PEO, addition of only 0.3 wt% f-G provided an increase of 92% to the storage modulus. These findings are similar to the nanoindentation results, which yielded increases in the reduced modulus of the same composition by about 92%. Nanoindentation testing shows that the incorporation of 0.3 wt% f-G increased the reduced modulus and hardness of the keratin-PEO blend by about 155 and 99%, respectively.",
publisher = "Royal Society of Chemistry",
journal = "RSC Advances",
title = "Keratin-polyethylene oxide bio-nanocomposites reinforced with ultrasonically functionalized graphene",
pages = "91287-91280",
number = "111",
volume = "5",
doi = "10.1039/c5ra12402f"
}

Grković, M., Stojanović, D., Kojović, A., Strnad, S., Kreže, T., Aleksić, R.,& Uskoković, P.. (2015). Keratin-polyethylene oxide bio-nanocomposites reinforced with ultrasonically functionalized graphene. in RSC Advances
Royal Society of Chemistry., 5(111), 91280-91287.
https://doi.org/10.1039/c5ra12402f

Grković M, Stojanović D, Kojović A, Strnad S, Kreže T, Aleksić R, Uskoković P. Keratin-polyethylene oxide bio-nanocomposites reinforced with ultrasonically functionalized graphene. in RSC Advances. 2015;5(111):91280-91287.
doi:10.1039/c5ra12402f .

Grković, Mirjana, Stojanović, Dušica, Kojović, Aleksandar, Strnad, Simona, Kreže, Tatjana, Aleksić, Radoslav, Uskoković, Petar, "Keratin-polyethylene oxide bio-nanocomposites reinforced with ultrasonically functionalized graphene" in RSC Advances, 5, no. 111 (2015):91280-91287,
https://doi.org/10.1039/c5ra12402f . .

TY  - JOUR
AU  - Lamovec, Jelena
AU  - Jović, Vesna
AU  - Mladenović, Ivana
AU  - Stojanović, Dušica
AU  - Kojović, Aleksandar
AU  - Radojević, Vesna
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2961
AB  - This investigation has been carried out in order to analyse and compare the hardness response of different composite systems of the same type, named 'soft film on hard substrate' composite system. Composite systems of mono- and multilayered electrodeposited Ni and Cu thin films on (100) and (111)-oriented monocrystalline Si wafers and 100 µm-thick electrodeposited Ni film as the substrates were fabricated. The indentation behaviour of these composite structures was characterized using Berkovich nanohardness and Vickers microhardness testing. The measured hardness is so-called 'composite hardness', because the substrate participates in the plastic deformation during the indentation process. The contribution of the substrate to the measured hardness starts at indentation depths of the order of 0.07- 0.2 times the film thickness. Dependence of nanohardness and microhardness values on electrodeposition process conditions, substrate and film microstructure, total film thickness, layer thickness and Ni/Cu layer thickness ratio for different composite systems ratio was investigated. Composite hardness model of Chicot-Lesage (C-L) was chosen and applied to experimental data in order to determine absolute film hardness.
AB  - Ovo istraživanje je izvršeno u cilju analize i upoređivanja odziva različitih kompozitnih sistema koji pripadaju istom tipu sistema nazvanom 'mek film na tvrdom supstratu', pri merenju tvrdoće. Formirani su kompozitni sistemi elektrodepozicijom jedno- i višeslojnih Ni i Cu tankih filmova na (100) i (111)- orijentisanim monokristalnim Si pločicama i 100-µm debelom elektrodeponovanom Ni filmu kao supstratima. Ponašanje ovih kompozitnih struktura pri utiskivanju je okarakterisano merenjem nanotvrdoće po Berkoviču i mikrotvrdoće po Vikersu. Izmerena vrednost mikrotvrdoće se naziva 'kompozitnom tvrdoćom' jer prilikom testiranja utiskivanjem dolazi i do plastične deformacije supstrata. Doprinos deformacije supstrata izmerenoj tvrdoći počinje na dubinama utiskivanja koje su reda 0.07-0.2 puta manje od debljine filma. Istraživana je zavisnost vrednosti nanotvrdoće i mikrotvrdoće od procesnih parametera elektrodepozicije, mikrostrukture supstrata i filmova, ukupne debljine filma, debljine pojedinačnog sloja u filmu i odnosa debljina Ni/Cu pojedinačnih slojeva u filmu za različite kompozitne sisteme. Radi određivanja apsolutne tvrdoće filma u sistemu, odabran je i na eksperimentalne rezultate primenjen model kompozitne tvrdoće Šiko-Lezaž (C-L).
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Indentation behaviour of 'soft film on hard substrate' composite system type
T1  - Ponašanje kompozitnih sistema tipa 'mek film na tvrdom supstratu' na testu utiskivanja
EP  - 277
IS  - 3
SP  - 269
VL  - 56
DO  - 10.5937/ZasMat1503269L
ER  - 

@article{
author = "Lamovec, Jelena and Jović, Vesna and Mladenović, Ivana and Stojanović, Dušica and Kojović, Aleksandar and Radojević, Vesna",
year = "2015",
abstract = "This investigation has been carried out in order to analyse and compare the hardness response of different composite systems of the same type, named 'soft film on hard substrate' composite system. Composite systems of mono- and multilayered electrodeposited Ni and Cu thin films on (100) and (111)-oriented monocrystalline Si wafers and 100 µm-thick electrodeposited Ni film as the substrates were fabricated. The indentation behaviour of these composite structures was characterized using Berkovich nanohardness and Vickers microhardness testing. The measured hardness is so-called 'composite hardness', because the substrate participates in the plastic deformation during the indentation process. The contribution of the substrate to the measured hardness starts at indentation depths of the order of 0.07- 0.2 times the film thickness. Dependence of nanohardness and microhardness values on electrodeposition process conditions, substrate and film microstructure, total film thickness, layer thickness and Ni/Cu layer thickness ratio for different composite systems ratio was investigated. Composite hardness model of Chicot-Lesage (C-L) was chosen and applied to experimental data in order to determine absolute film hardness., Ovo istraživanje je izvršeno u cilju analize i upoređivanja odziva različitih kompozitnih sistema koji pripadaju istom tipu sistema nazvanom 'mek film na tvrdom supstratu', pri merenju tvrdoće. Formirani su kompozitni sistemi elektrodepozicijom jedno- i višeslojnih Ni i Cu tankih filmova na (100) i (111)- orijentisanim monokristalnim Si pločicama i 100-µm debelom elektrodeponovanom Ni filmu kao supstratima. Ponašanje ovih kompozitnih struktura pri utiskivanju je okarakterisano merenjem nanotvrdoće po Berkoviču i mikrotvrdoće po Vikersu. Izmerena vrednost mikrotvrdoće se naziva 'kompozitnom tvrdoćom' jer prilikom testiranja utiskivanjem dolazi i do plastične deformacije supstrata. Doprinos deformacije supstrata izmerenoj tvrdoći počinje na dubinama utiskivanja koje su reda 0.07-0.2 puta manje od debljine filma. Istraživana je zavisnost vrednosti nanotvrdoće i mikrotvrdoće od procesnih parametera elektrodepozicije, mikrostrukture supstrata i filmova, ukupne debljine filma, debljine pojedinačnog sloja u filmu i odnosa debljina Ni/Cu pojedinačnih slojeva u filmu za različite kompozitne sisteme. Radi određivanja apsolutne tvrdoće filma u sistemu, odabran je i na eksperimentalne rezultate primenjen model kompozitne tvrdoće Šiko-Lezaž (C-L).",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Indentation behaviour of 'soft film on hard substrate' composite system type, Ponašanje kompozitnih sistema tipa 'mek film na tvrdom supstratu' na testu utiskivanja",
pages = "277-269",
number = "3",
volume = "56",
doi = "10.5937/ZasMat1503269L"
}

Lamovec, J., Jović, V., Mladenović, I., Stojanović, D., Kojović, A.,& Radojević, V.. (2015). Indentation behaviour of 'soft film on hard substrate' composite system type. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 56(3), 269-277.
https://doi.org/10.5937/ZasMat1503269L

Lamovec J, Jović V, Mladenović I, Stojanović D, Kojović A, Radojević V. Indentation behaviour of 'soft film on hard substrate' composite system type. in Zaštita materijala. 2015;56(3):269-277.
doi:10.5937/ZasMat1503269L .

Lamovec, Jelena, Jović, Vesna, Mladenović, Ivana, Stojanović, Dušica, Kojović, Aleksandar, Radojević, Vesna, "Indentation behaviour of 'soft film on hard substrate' composite system type" in Zaštita materijala, 56, no. 3 (2015):269-277,
https://doi.org/10.5937/ZasMat1503269L . .

TY  - JOUR
AU  - Ben Hasan, Somaya Ahmed
AU  - Stojanović, Dušica
AU  - Kojović, Aleksandar
AU  - Janković-Častvan, Ivona
AU  - Janaćković, Đorđe
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2794
AB  - This study presents an investigation of the effects of the processing conditions on the uniformity, morphology and structure of patterned nanofibrous mats of electrospun poly(vinyl butyral)/sepiolite (PVB/Sep) nanocomposite fibers, which is a novel system for applications in materials for antiballistic protection, biomedical scaffolds and sorption for water purification. Aqueous suspensions of sepiolite exhibit thixotropic behavior because of their fibrous structure, porosity, large specific surface area and the presence of silanol groups on the surface. Functionalization of the sepiolite fibers in an aqueous thixotropic gel was realized on the surface of individual fibers using amino silanes as coupling agents. Different contents (3 wt%, 30 wt% and 50 wt%) of neat and modified sepiolite fibers were dispersed by ultrasonic irradiation in an ethanolic solution of PVB and were used to obtain nanocomposite fibers by electrospinning. The modified PVB/Sep nanocomposite fibers showed a decrease in the mean fiber diameter by about 75% and an increase in the composite storage modulus by about 31% in comparison to the neat PVB fibers. The optimal uniformity of the diameter of the fabricated.nanofibers was obtained using a low flow rate (0.5 mL/h), high collector distance (15 cm) and a constant applied voltage of 24 kV. The advantages of the systems lay primarily in improved mechanical properties, which enabled proper manipulation through the achieved mechanical integrity of nanofilter structures in real applications.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Preparation and characterization of poly(vinyl butyral) electrospun nanocomposite fibers reinforced with ultrasonically functionalized sepiolite
EP  - 1146
IS  - 1
SP  - 1139
VL  - 40
DO  - 10.1016/j.ceramint.2013.06.115
ER  - 

@article{
author = "Ben Hasan, Somaya Ahmed and Stojanović, Dušica and Kojović, Aleksandar and Janković-Častvan, Ivona and Janaćković, Đorđe and Uskoković, Petar and Aleksić, Radoslav",
year = "2014",
abstract = "This study presents an investigation of the effects of the processing conditions on the uniformity, morphology and structure of patterned nanofibrous mats of electrospun poly(vinyl butyral)/sepiolite (PVB/Sep) nanocomposite fibers, which is a novel system for applications in materials for antiballistic protection, biomedical scaffolds and sorption for water purification. Aqueous suspensions of sepiolite exhibit thixotropic behavior because of their fibrous structure, porosity, large specific surface area and the presence of silanol groups on the surface. Functionalization of the sepiolite fibers in an aqueous thixotropic gel was realized on the surface of individual fibers using amino silanes as coupling agents. Different contents (3 wt%, 30 wt% and 50 wt%) of neat and modified sepiolite fibers were dispersed by ultrasonic irradiation in an ethanolic solution of PVB and were used to obtain nanocomposite fibers by electrospinning. The modified PVB/Sep nanocomposite fibers showed a decrease in the mean fiber diameter by about 75% and an increase in the composite storage modulus by about 31% in comparison to the neat PVB fibers. The optimal uniformity of the diameter of the fabricated.nanofibers was obtained using a low flow rate (0.5 mL/h), high collector distance (15 cm) and a constant applied voltage of 24 kV. The advantages of the systems lay primarily in improved mechanical properties, which enabled proper manipulation through the achieved mechanical integrity of nanofilter structures in real applications.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Preparation and characterization of poly(vinyl butyral) electrospun nanocomposite fibers reinforced with ultrasonically functionalized sepiolite",
pages = "1146-1139",
number = "1",
volume = "40",
doi = "10.1016/j.ceramint.2013.06.115"
}

Ben Hasan, S. A., Stojanović, D., Kojović, A., Janković-Častvan, I., Janaćković, Đ., Uskoković, P.,& Aleksić, R.. (2014). Preparation and characterization of poly(vinyl butyral) electrospun nanocomposite fibers reinforced with ultrasonically functionalized sepiolite. in Ceramics International
Elsevier Sci Ltd, Oxford., 40(1), 1139-1146.
https://doi.org/10.1016/j.ceramint.2013.06.115

Ben Hasan SA, Stojanović D, Kojović A, Janković-Častvan I, Janaćković Đ, Uskoković P, Aleksić R. Preparation and characterization of poly(vinyl butyral) electrospun nanocomposite fibers reinforced with ultrasonically functionalized sepiolite. in Ceramics International. 2014;40(1):1139-1146.
doi:10.1016/j.ceramint.2013.06.115 .

Ben Hasan, Somaya Ahmed, Stojanović, Dušica, Kojović, Aleksandar, Janković-Častvan, Ivona, Janaćković, Đorđe, Uskoković, Petar, Aleksić, Radoslav, "Preparation and characterization of poly(vinyl butyral) electrospun nanocomposite fibers reinforced with ultrasonically functionalized sepiolite" in Ceramics International, 40, no. 1 (2014):1139-1146,
https://doi.org/10.1016/j.ceramint.2013.06.115 . .

TY  - JOUR
AU  - Obradović, Vera
AU  - Stojanović, Dušica
AU  - Kojović, Aleksandar
AU  - Živković, Irena
AU  - Radojević, Vesna
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2603
AB  - In this study, the electrospun nanofibers, nanoparticles and nanotubes were used as reinforcement in order to improve mechanical properties of materials for ballistic protection. The samples of polyurethane/p-aramid multiaxial fabric forms (Twaron fabrics and Colon fabrics) were impregnated with poly (vinyl butyral) (PVB) ethanol solution with the different content of reinforcement. Due to the improvement in mechanical, ballistic and impact properties, the surface modification of the fabrics with γ-aminopropyltriethoxysilane (AMEO silane)/ethanol solution was used and silica nanoparticles were modified with AMEO silane. This study is divided into three parts of research: electrospinning process, ballistic testing of the p-aramid composites and impact tester analysis of the Colon composites. The mechanical properties of all the composites were tested by the dynamic mechanical analysis (DMA).
AB  - U ovom istraživanju su se elektrospinovana vlakna, nanočestice i nanocevi koristili kao ojačanja koja bi unapredila mehanička svojstva materijala za balističku zaštitu. Uzorci poliuretan/paramidnih multiaksijalnih lamina (Twaron i Kolon lamine) su impregnisani sa poli(vinil butiral)(PVB)/etanol rastvorom sa različitim sadržajem ojačanja. Radi poboljšanja mehaničkih, balističkih i impakt svojstava, modifikovala se površina lamina sa γ-aminopropiltrietoksisilanom (AMEO silan)/etanol rastvorom i koristile su se silika nanočestice modifikovane AMEO silanom. Ovaj rad je podeljen na tri dela istraživanja: proces elektrospininga, balističko testiranje paramidnih kompozita i impakt tester analiza Kolon kompozita. Mehanička svojstva svih kompozita su bila testirana pomoću dinamičko mehaničke analize (DMA).
PB  - Engineering Society for Corrosion, Belgrade, Serbia
T2  - Zaštita materijala
T1  - Aramid composites impregnated with different reinforcement: Nanofibers, nanoparticles and nanotubes
T1  - Aramidni kompoziti impregnisani sa različitim ojačanjima - nanovlakna, nanočestice i nanocevi
EP  - 361
IS  - 4
SP  - 351
VL  - 55
DO  - 10.5937/ZasMat1404351O
ER  - 

@article{
author = "Obradović, Vera and Stojanović, Dušica and Kojović, Aleksandar and Živković, Irena and Radojević, Vesna and Uskoković, Petar and Aleksić, Radoslav",
year = "2014",
abstract = "In this study, the electrospun nanofibers, nanoparticles and nanotubes were used as reinforcement in order to improve mechanical properties of materials for ballistic protection. The samples of polyurethane/p-aramid multiaxial fabric forms (Twaron fabrics and Colon fabrics) were impregnated with poly (vinyl butyral) (PVB) ethanol solution with the different content of reinforcement. Due to the improvement in mechanical, ballistic and impact properties, the surface modification of the fabrics with γ-aminopropyltriethoxysilane (AMEO silane)/ethanol solution was used and silica nanoparticles were modified with AMEO silane. This study is divided into three parts of research: electrospinning process, ballistic testing of the p-aramid composites and impact tester analysis of the Colon composites. The mechanical properties of all the composites were tested by the dynamic mechanical analysis (DMA)., U ovom istraživanju su se elektrospinovana vlakna, nanočestice i nanocevi koristili kao ojačanja koja bi unapredila mehanička svojstva materijala za balističku zaštitu. Uzorci poliuretan/paramidnih multiaksijalnih lamina (Twaron i Kolon lamine) su impregnisani sa poli(vinil butiral)(PVB)/etanol rastvorom sa različitim sadržajem ojačanja. Radi poboljšanja mehaničkih, balističkih i impakt svojstava, modifikovala se površina lamina sa γ-aminopropiltrietoksisilanom (AMEO silan)/etanol rastvorom i koristile su se silika nanočestice modifikovane AMEO silanom. Ovaj rad je podeljen na tri dela istraživanja: proces elektrospininga, balističko testiranje paramidnih kompozita i impakt tester analiza Kolon kompozita. Mehanička svojstva svih kompozita su bila testirana pomoću dinamičko mehaničke analize (DMA).",
publisher = "Engineering Society for Corrosion, Belgrade, Serbia",
journal = "Zaštita materijala",
title = "Aramid composites impregnated with different reinforcement: Nanofibers, nanoparticles and nanotubes, Aramidni kompoziti impregnisani sa različitim ojačanjima - nanovlakna, nanočestice i nanocevi",
pages = "361-351",
number = "4",
volume = "55",
doi = "10.5937/ZasMat1404351O"
}

Obradović, V., Stojanović, D., Kojović, A., Živković, I., Radojević, V., Uskoković, P.,& Aleksić, R.. (2014). Aramid composites impregnated with different reinforcement: Nanofibers, nanoparticles and nanotubes. in Zaštita materijala
Engineering Society for Corrosion, Belgrade, Serbia., 55(4), 351-361.
https://doi.org/10.5937/ZasMat1404351O

Obradović V, Stojanović D, Kojović A, Živković I, Radojević V, Uskoković P, Aleksić R. Aramid composites impregnated with different reinforcement: Nanofibers, nanoparticles and nanotubes. in Zaštita materijala. 2014;55(4):351-361.
doi:10.5937/ZasMat1404351O .

Obradović, Vera, Stojanović, Dušica, Kojović, Aleksandar, Živković, Irena, Radojević, Vesna, Uskoković, Petar, Aleksić, Radoslav, "Aramid composites impregnated with different reinforcement: Nanofibers, nanoparticles and nanotubes" in Zaštita materijala, 55, no. 4 (2014):351-361,
https://doi.org/10.5937/ZasMat1404351O . .

TY  - JOUR
AU  - Ben Hasan, Somaya Ahmed
AU  - Dimitrijević, Marija
AU  - Kojović, Aleksandar
AU  - Stojanović, Dušica
AU  - Obradović-Đuričić, Kosovka
AU  - Jančić-Heinemann, Radmila
AU  - Aleksić, Radoslav
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2748
AB  - Composites with the addition of alumina nanofillers show improvement in mechanical properties.Poly(methyl methacrylate), PMMA, was used as a matrix and two different types of nanofillers having extremely different shapes were added into the matrix to form the composites. The reinforcements were based on alumina nanoparticles having either a spherical shape or whiskers with a length to diameter ratio of 100. The influence of the size and shape of the alumina fillers and the loading on the mechanical properties of the prepared composite were studied using nanoindentation measurements and dynamic mechanical analysis. It was observed that both alumina whiskers and spherical alumina nanoparticles added in the PMMA matrix improved the mechanical properties of the composites, but the improvement was significantly higher with reinforcement by alumina whiskers. The concentration of the reinforcing spherical alumina nanoparticles and alumina whiskers in the PMMA matrix varied up to 5 wt. %. The best performance was obtained by the addition of 3 wt. % of alumina whiskers in the PMMA matrix in terms of the mechanical properties of the obtained composite.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - The effect of the size and shape of alumina nanofillers on the mechanical behavior of PMMA matrix composites
EP  - 1307
IS  - 10
SP  - 1295
VL  - 79
DO  - 10.2298/JSC140121035B
ER  - 

@article{
author = "Ben Hasan, Somaya Ahmed and Dimitrijević, Marija and Kojović, Aleksandar and Stojanović, Dušica and Obradović-Đuričić, Kosovka and Jančić-Heinemann, Radmila and Aleksić, Radoslav",
year = "2014",
abstract = "Composites with the addition of alumina nanofillers show improvement in mechanical properties.Poly(methyl methacrylate), PMMA, was used as a matrix and two different types of nanofillers having extremely different shapes were added into the matrix to form the composites. The reinforcements were based on alumina nanoparticles having either a spherical shape or whiskers with a length to diameter ratio of 100. The influence of the size and shape of the alumina fillers and the loading on the mechanical properties of the prepared composite were studied using nanoindentation measurements and dynamic mechanical analysis. It was observed that both alumina whiskers and spherical alumina nanoparticles added in the PMMA matrix improved the mechanical properties of the composites, but the improvement was significantly higher with reinforcement by alumina whiskers. The concentration of the reinforcing spherical alumina nanoparticles and alumina whiskers in the PMMA matrix varied up to 5 wt. %. The best performance was obtained by the addition of 3 wt. % of alumina whiskers in the PMMA matrix in terms of the mechanical properties of the obtained composite.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "The effect of the size and shape of alumina nanofillers on the mechanical behavior of PMMA matrix composites",
pages = "1307-1295",
number = "10",
volume = "79",
doi = "10.2298/JSC140121035B"
}

Ben Hasan, S. A., Dimitrijević, M., Kojović, A., Stojanović, D., Obradović-Đuričić, K., Jančić-Heinemann, R.,& Aleksić, R.. (2014). The effect of the size and shape of alumina nanofillers on the mechanical behavior of PMMA matrix composites. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 79(10), 1295-1307.
https://doi.org/10.2298/JSC140121035B

Ben Hasan SA, Dimitrijević M, Kojović A, Stojanović D, Obradović-Đuričić K, Jančić-Heinemann R, Aleksić R. The effect of the size and shape of alumina nanofillers on the mechanical behavior of PMMA matrix composites. in Journal of the Serbian Chemical Society. 2014;79(10):1295-1307.
doi:10.2298/JSC140121035B .

Ben Hasan, Somaya Ahmed, Dimitrijević, Marija, Kojović, Aleksandar, Stojanović, Dušica, Obradović-Đuričić, Kosovka, Jančić-Heinemann, Radmila, Aleksić, Radoslav, "The effect of the size and shape of alumina nanofillers on the mechanical behavior of PMMA matrix composites" in Journal of the Serbian Chemical Society, 79, no. 10 (2014):1295-1307,
https://doi.org/10.2298/JSC140121035B . .

TY  - JOUR
AU  - Obradović, Vera
AU  - Stojanović, Dušica
AU  - Kojović, Aleksandar
AU  - Zivković, Irena
AU  - Radojević, Vesna
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2554
AB  - The poly (vinyl butyral)/silica (PVB/SiO2) composite fibers were produced by the electrospinning process. The experiments were performed with the PVB solution in concentration of 10 wt.% where ethanol was used as the solvent. The silica nanoparticles were added into the solution in different content of 1, 3 and 5 wt.% SiO2. The PVB fibers with 50 wt.% SiO2 nanoparticles were deposited on p-aramid fabrics which were coated with PVB solution. The effect of the processing parameters on the morphology of PVB/SiO2 composite fibers was analysed. Mechanical properties of the p-aramid fabrics were tested by dynamic mechanical analysis (DMA).
T2  - Materiale Plastice
T1  - Electrospun Poly(vinylbutyral)/silica Composite Fibres for Impregnation of Aramid Fabrics
EP  - 322
IS  - 3
SP  - 319
VL  - 51
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2554
ER  - 

@article{
author = "Obradović, Vera and Stojanović, Dušica and Kojović, Aleksandar and Zivković, Irena and Radojević, Vesna and Uskoković, Petar and Aleksić, Radoslav",
year = "2014",
abstract = "The poly (vinyl butyral)/silica (PVB/SiO2) composite fibers were produced by the electrospinning process. The experiments were performed with the PVB solution in concentration of 10 wt.% where ethanol was used as the solvent. The silica nanoparticles were added into the solution in different content of 1, 3 and 5 wt.% SiO2. The PVB fibers with 50 wt.% SiO2 nanoparticles were deposited on p-aramid fabrics which were coated with PVB solution. The effect of the processing parameters on the morphology of PVB/SiO2 composite fibers was analysed. Mechanical properties of the p-aramid fabrics were tested by dynamic mechanical analysis (DMA).",
journal = "Materiale Plastice",
title = "Electrospun Poly(vinylbutyral)/silica Composite Fibres for Impregnation of Aramid Fabrics",
pages = "322-319",
number = "3",
volume = "51",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2554"
}

Obradović, V., Stojanović, D., Kojović, A., Zivković, I., Radojević, V., Uskoković, P.,& Aleksić, R.. (2014). Electrospun Poly(vinylbutyral)/silica Composite Fibres for Impregnation of Aramid Fabrics. in Materiale Plastice, 51(3), 319-322.
https://hdl.handle.net/21.15107/rcub_technorep_2554

Obradović V, Stojanović D, Kojović A, Zivković I, Radojević V, Uskoković P, Aleksić R. Electrospun Poly(vinylbutyral)/silica Composite Fibres for Impregnation of Aramid Fabrics. in Materiale Plastice. 2014;51(3):319-322.
https://hdl.handle.net/21.15107/rcub_technorep_2554 .

Obradović, Vera, Stojanović, Dušica, Kojović, Aleksandar, Zivković, Irena, Radojević, Vesna, Uskoković, Petar, Aleksić, Radoslav, "Electrospun Poly(vinylbutyral)/silica Composite Fibres for Impregnation of Aramid Fabrics" in Materiale Plastice, 51, no. 3 (2014):319-322,
https://hdl.handle.net/21.15107/rcub_technorep_2554 .

TY  - JOUR
AU  - Milanović, Predrag
AU  - Dimitrijević, Marija
AU  - Jančić-Heinemann, Radmila
AU  - Rogan, Jelena
AU  - Stojanović, Dušica
AU  - Kojović, Aleksandar
AU  - Aleksić, Radoslav
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2482
AB  - Alumina nanofibers are very suitable materials for use as reinforcement in a great variety of high performance composite materials. Nanosized alumina fibers were prepared from the aluminum chloride hydroxide/poly (vinyl alcohol)/water precursor using the electrospinning technique. The mass ratio of aluminum chloride hydroxide/polymer was 5/1. The fibers were calcinated at 1100 degrees C. The fibers were characterized by the TGA/DTA, XRD and FESEM methods. Calcinated fibers had a mean diameter of 470 nm and corundum well defined crystal structure.
PB  - Elsevier Sci Ltd, Oxford
T2  - Ceramics International
T1  - Preparation of low cost alumina nanofibers via electrospinning of aluminium chloride hydroxide/poly (vinyl alcohol) solution
EP  - 2134
IS  - 2
SP  - 2131
VL  - 39
DO  - 10.1016/j.ceramint.2012.07.062
ER  - 

@article{
author = "Milanović, Predrag and Dimitrijević, Marija and Jančić-Heinemann, Radmila and Rogan, Jelena and Stojanović, Dušica and Kojović, Aleksandar and Aleksić, Radoslav",
year = "2013",
abstract = "Alumina nanofibers are very suitable materials for use as reinforcement in a great variety of high performance composite materials. Nanosized alumina fibers were prepared from the aluminum chloride hydroxide/poly (vinyl alcohol)/water precursor using the electrospinning technique. The mass ratio of aluminum chloride hydroxide/polymer was 5/1. The fibers were calcinated at 1100 degrees C. The fibers were characterized by the TGA/DTA, XRD and FESEM methods. Calcinated fibers had a mean diameter of 470 nm and corundum well defined crystal structure.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Ceramics International",
title = "Preparation of low cost alumina nanofibers via electrospinning of aluminium chloride hydroxide/poly (vinyl alcohol) solution",
pages = "2134-2131",
number = "2",
volume = "39",
doi = "10.1016/j.ceramint.2012.07.062"
}

Milanović, P., Dimitrijević, M., Jančić-Heinemann, R., Rogan, J., Stojanović, D., Kojović, A.,& Aleksić, R.. (2013). Preparation of low cost alumina nanofibers via electrospinning of aluminium chloride hydroxide/poly (vinyl alcohol) solution. in Ceramics International
Elsevier Sci Ltd, Oxford., 39(2), 2131-2134.
https://doi.org/10.1016/j.ceramint.2012.07.062

Milanović P, Dimitrijević M, Jančić-Heinemann R, Rogan J, Stojanović D, Kojović A, Aleksić R. Preparation of low cost alumina nanofibers via electrospinning of aluminium chloride hydroxide/poly (vinyl alcohol) solution. in Ceramics International. 2013;39(2):2131-2134.
doi:10.1016/j.ceramint.2012.07.062 .

Milanović, Predrag, Dimitrijević, Marija, Jančić-Heinemann, Radmila, Rogan, Jelena, Stojanović, Dušica, Kojović, Aleksandar, Aleksić, Radoslav, "Preparation of low cost alumina nanofibers via electrospinning of aluminium chloride hydroxide/poly (vinyl alcohol) solution" in Ceramics International, 39, no. 2 (2013):2131-2134,
https://doi.org/10.1016/j.ceramint.2012.07.062 . .

TY  - JOUR
AU  - Stojanović, Dušica
AU  - Zrilić, Milorad
AU  - Jančić-Heinemann, Radmila
AU  - Zivković, Irena
AU  - Kojović, Aleksandar
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2416
AB  - New forms of hybrid multiaxial nanocomposites with enhanced mechanical and stab resisting properties are presented. This study is motivated by the lack of knowledge in the study of the multiaxial fabric nanocomposites with two modified thermoplastic matrices for antiballistic protection. Introduction of 5 wt.% silica nanoparticles in the composite of polyurethane/p-aramid/poly (vinyl butyral) leads to significant improvement in mechanical properties, and the addition of silane as a coupling agents and glutaraldehyde as a crosslinking agents yielded maximal values of storage modulus, tensile modulus and anti-stabbing properties for hybrid nanocomposites. Ballistic resistance testing and penetration depth of the hybrid nanocomposites were visualized using image analysis.
PB  - Wiley, Hoboken
T2  - Polymers for Advanced Technologies
T1  - Mechanical and anti-stabbing properties of modified thermoplastic polymers impregnated multiaxial p-aramid fabrics
EP  - 776
IS  - 8
SP  - 772
VL  - 24
DO  - 10.1002/pat.3141
ER  - 

@article{
author = "Stojanović, Dušica and Zrilić, Milorad and Jančić-Heinemann, Radmila and Zivković, Irena and Kojović, Aleksandar and Uskoković, Petar and Aleksić, Radoslav",
year = "2013",
abstract = "New forms of hybrid multiaxial nanocomposites with enhanced mechanical and stab resisting properties are presented. This study is motivated by the lack of knowledge in the study of the multiaxial fabric nanocomposites with two modified thermoplastic matrices for antiballistic protection. Introduction of 5 wt.% silica nanoparticles in the composite of polyurethane/p-aramid/poly (vinyl butyral) leads to significant improvement in mechanical properties, and the addition of silane as a coupling agents and glutaraldehyde as a crosslinking agents yielded maximal values of storage modulus, tensile modulus and anti-stabbing properties for hybrid nanocomposites. Ballistic resistance testing and penetration depth of the hybrid nanocomposites were visualized using image analysis.",
publisher = "Wiley, Hoboken",
journal = "Polymers for Advanced Technologies",
title = "Mechanical and anti-stabbing properties of modified thermoplastic polymers impregnated multiaxial p-aramid fabrics",
pages = "776-772",
number = "8",
volume = "24",
doi = "10.1002/pat.3141"
}

Stojanović, D., Zrilić, M., Jančić-Heinemann, R., Zivković, I., Kojović, A., Uskoković, P.,& Aleksić, R.. (2013). Mechanical and anti-stabbing properties of modified thermoplastic polymers impregnated multiaxial p-aramid fabrics. in Polymers for Advanced Technologies
Wiley, Hoboken., 24(8), 772-776.
https://doi.org/10.1002/pat.3141

Stojanović D, Zrilić M, Jančić-Heinemann R, Zivković I, Kojović A, Uskoković P, Aleksić R. Mechanical and anti-stabbing properties of modified thermoplastic polymers impregnated multiaxial p-aramid fabrics. in Polymers for Advanced Technologies. 2013;24(8):772-776.
doi:10.1002/pat.3141 .

Stojanović, Dušica, Zrilić, Milorad, Jančić-Heinemann, Radmila, Zivković, Irena, Kojović, Aleksandar, Uskoković, Petar, Aleksić, Radoslav, "Mechanical and anti-stabbing properties of modified thermoplastic polymers impregnated multiaxial p-aramid fabrics" in Polymers for Advanced Technologies, 24, no. 8 (2013):772-776,
https://doi.org/10.1002/pat.3141 . .

TY  - JOUR
AU  - Đokić, Jelena D.
AU  - Kojović, Aleksandar
AU  - Stojanović, Dušica
AU  - Marinković, Aleksandar
AU  - Vuković, Goran D.
AU  - Aleksić, Radoslav
AU  - Uskoković, Petar
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2077
AB  - Chitosan-based films have found increasing implementation in a variety of fields, among which are as drug delivery carriers, in the packaging industry and as water purification filters. Therefore, in order to achieve mechanical integrity of such films while preserving processability and biocompatibility, chitosan-based films are fabricated in the forms of blends with poly(ethylene oxide) (PEO). A nano-indentation study was undertaken in order to investigate the nanomechanical properties and surface morphology of chitosan films in blends with various content of PEO. The results of differential scanning calorimetry, water uptake and nano-indentation revealed that films with an 80/20 blend ratio of chitosan/PEO showed the optimal values of reduced modulus and hardness. It appears that the incorporation of the synthetic PEO in chitosan films could lower the manufacturing costs while preserving the mechanical integrity of the films.
AB  - Filmovi na bazi hitozana nalaze sve širu primenu u raznim oblastima između ostalog kao nosači lekova, u industriji ambalaže i kao filteri za prečišćavanje voda. Da bi se postigao mehanički integritet ovakvih filmova i zadržala procesabilnost i biokompatibilnost, filmovi na bazi hitozana pripremljeni su u formi blendi sa polietilen oksidom (PEO). Studija nanoindentacije urađena je u cilju proučavanja nanomehaničkih svojstava i površinske morfologije hitozanskih filmova u blendama sa različitim sadržajem PEO. Rezultati DSC-a, apsorpcije vode i nanoindentacije pokazali su da filmovi blendi sa odnosom 80/20 hitozana i PEO poseduju optimalne vrednosti redukovanog modula elastičnosti i tvrdoće. Pokazano je da dodavanje sintetičkog PEO u hitozanske filmove može smanjiti cenu proizvodnje i istovremeno zadržati mehanički integritet filmova.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Processing and nanomechanical properties of chitosan/poly(ethylene oxide) blend films
T1  - Procesiranje i nanomehanička svojstva filma blendi hitozan/polietilen-oksid
EP  - 1733
IS  - 12
SP  - 1723
VL  - 77
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2077
ER  - 

@article{
author = "Đokić, Jelena D. and Kojović, Aleksandar and Stojanović, Dušica and Marinković, Aleksandar and Vuković, Goran D. and Aleksić, Radoslav and Uskoković, Petar",
year = "2012",
abstract = "Chitosan-based films have found increasing implementation in a variety of fields, among which are as drug delivery carriers, in the packaging industry and as water purification filters. Therefore, in order to achieve mechanical integrity of such films while preserving processability and biocompatibility, chitosan-based films are fabricated in the forms of blends with poly(ethylene oxide) (PEO). A nano-indentation study was undertaken in order to investigate the nanomechanical properties and surface morphology of chitosan films in blends with various content of PEO. The results of differential scanning calorimetry, water uptake and nano-indentation revealed that films with an 80/20 blend ratio of chitosan/PEO showed the optimal values of reduced modulus and hardness. It appears that the incorporation of the synthetic PEO in chitosan films could lower the manufacturing costs while preserving the mechanical integrity of the films., Filmovi na bazi hitozana nalaze sve širu primenu u raznim oblastima između ostalog kao nosači lekova, u industriji ambalaže i kao filteri za prečišćavanje voda. Da bi se postigao mehanički integritet ovakvih filmova i zadržala procesabilnost i biokompatibilnost, filmovi na bazi hitozana pripremljeni su u formi blendi sa polietilen oksidom (PEO). Studija nanoindentacije urađena je u cilju proučavanja nanomehaničkih svojstava i površinske morfologije hitozanskih filmova u blendama sa različitim sadržajem PEO. Rezultati DSC-a, apsorpcije vode i nanoindentacije pokazali su da filmovi blendi sa odnosom 80/20 hitozana i PEO poseduju optimalne vrednosti redukovanog modula elastičnosti i tvrdoće. Pokazano je da dodavanje sintetičkog PEO u hitozanske filmove može smanjiti cenu proizvodnje i istovremeno zadržati mehanički integritet filmova.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Processing and nanomechanical properties of chitosan/poly(ethylene oxide) blend films, Procesiranje i nanomehanička svojstva filma blendi hitozan/polietilen-oksid",
pages = "1733-1723",
number = "12",
volume = "77",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2077"
}

Đokić, J. D., Kojović, A., Stojanović, D., Marinković, A., Vuković, G. D., Aleksić, R.,& Uskoković, P.. (2012). Processing and nanomechanical properties of chitosan/poly(ethylene oxide) blend films. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 77(12), 1723-1733.
https://hdl.handle.net/21.15107/rcub_technorep_2077

Đokić JD, Kojović A, Stojanović D, Marinković A, Vuković GD, Aleksić R, Uskoković P. Processing and nanomechanical properties of chitosan/poly(ethylene oxide) blend films. in Journal of the Serbian Chemical Society. 2012;77(12):1723-1733.
https://hdl.handle.net/21.15107/rcub_technorep_2077 .

Đokić, Jelena D., Kojović, Aleksandar, Stojanović, Dušica, Marinković, Aleksandar, Vuković, Goran D., Aleksić, Radoslav, Uskoković, Petar, "Processing and nanomechanical properties of chitosan/poly(ethylene oxide) blend films" in Journal of the Serbian Chemical Society, 77, no. 12 (2012):1723-1733,
https://hdl.handle.net/21.15107/rcub_technorep_2077 .

TY  - CONF
AU  - Obradović, Vera
AU  - Stojanović, Dušica
AU  - Kojović, Aleksandar
AU  - Živković, Irena
AU  - Jančić-Hajneman, Radmila
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7082
AB  - The PVB-SiO2 composite nanofibers were obtained by the electrospinning process. The experiments were carried out with PVB solution in concentration of 10 wt% where as the solvent was used ethanol. The silica nanoparticles were added in the solution in different content of 1, 3 and 5 wt% SiO2, and they were both modified and unmodified with amino-silane. The impact of the parameters of the electrospinning process on the produced PVB-SiO2 nanocomposite fibers was tested. The structures of the PVB-SiO2 nanocomposite fibers were investigated using scanning electron microscopy (SEM) and characterized by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and thermogravimetric (TG) analysis. The morphology and distribution of the resulting nanofibers were analyzed using software Image - Pro Plus.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Programme and the book of abstracts / Thirteenth Annual Conference YUCOMAT 2011, Herceg Novi, Montenegro, September 5-9, 2011
T1  - The analysis of stability of the electrospinning process of forming PVB-SiO2 nanocomposite fibers
SP  - 143
UR  - https://hdl.handle.net/21.15107/rcub_technorep_7082
ER  - 

@conference{
author = "Obradović, Vera and Stojanović, Dušica and Kojović, Aleksandar and Živković, Irena and Jančić-Hajneman, Radmila and Uskoković, Petar and Aleksić, Radoslav",
year = "2011",
abstract = "The PVB-SiO2 composite nanofibers were obtained by the electrospinning process. The experiments were carried out with PVB solution in concentration of 10 wt% where as the solvent was used ethanol. The silica nanoparticles were added in the solution in different content of 1, 3 and 5 wt% SiO2, and they were both modified and unmodified with amino-silane. The impact of the parameters of the electrospinning process on the produced PVB-SiO2 nanocomposite fibers was tested. The structures of the PVB-SiO2 nanocomposite fibers were investigated using scanning electron microscopy (SEM) and characterized by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and thermogravimetric (TG) analysis. The morphology and distribution of the resulting nanofibers were analyzed using software Image - Pro Plus.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Programme and the book of abstracts / Thirteenth Annual Conference YUCOMAT 2011, Herceg Novi, Montenegro, September 5-9, 2011",
title = "The analysis of stability of the electrospinning process of forming PVB-SiO2 nanocomposite fibers",
pages = "143",
url = "https://hdl.handle.net/21.15107/rcub_technorep_7082"
}

Obradović, V., Stojanović, D., Kojović, A., Živković, I., Jančić-Hajneman, R., Uskoković, P.,& Aleksić, R.. (2011). The analysis of stability of the electrospinning process of forming PVB-SiO2 nanocomposite fibers. in Programme and the book of abstracts / Thirteenth Annual Conference YUCOMAT 2011, Herceg Novi, Montenegro, September 5-9, 2011
Belgrade : Materials Research Society of Serbia., 143.
https://hdl.handle.net/21.15107/rcub_technorep_7082

Obradović V, Stojanović D, Kojović A, Živković I, Jančić-Hajneman R, Uskoković P, Aleksić R. The analysis of stability of the electrospinning process of forming PVB-SiO2 nanocomposite fibers. in Programme and the book of abstracts / Thirteenth Annual Conference YUCOMAT 2011, Herceg Novi, Montenegro, September 5-9, 2011. 2011;:143.
https://hdl.handle.net/21.15107/rcub_technorep_7082 .

Obradović, Vera, Stojanović, Dušica, Kojović, Aleksandar, Živković, Irena, Jančić-Hajneman, Radmila, Uskoković, Petar, Aleksić, Radoslav, "The analysis of stability of the electrospinning process of forming PVB-SiO2 nanocomposite fibers" in Programme and the book of abstracts / Thirteenth Annual Conference YUCOMAT 2011, Herceg Novi, Montenegro, September 5-9, 2011 (2011):143,
https://hdl.handle.net/21.15107/rcub_technorep_7082 .

TY  - JOUR
AU  - Obradović, Vera
AU  - Kojović, Aleksandar
AU  - Stojanović, Dušica
AU  - Nikolić, Nebojša
AU  - Živković, Irena
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1791
AB  - The poly (vinyl butyral)-silica (PVB-SiO2) nanofibers were obtained by the electrospinning process. The experiments were carried out with PVB solution in concentration of 10 wt.% where ethanol was used as the solvent. The silica nanoparticles were added in the solution in different contents of 1, 3 and 5 wt.% SiO2 and nanoparticles were modified with γ-aminopropyltriethoxysilane (AMEO silane). The impacts of the parameters of the electrospinning process and the silica nanoparticles on the produced PVB-SiO2 nanocomposite fibers were tested. The structures of the PVB-SiO2 nanocomposite fibers were investigated using optical microscopy and scanning electron microscopy (SEM). The morphology and distribution of the resulting nanofibers were analyzed using the software Image-Pro Plus. .
AB  - Poli (vinil butiral)-silika (PVB-SiO2) nanovlakna su dobijena metodom elektrospininga. Eksperimenti su izvedeni u rastvoru 10 mas.% PVB-a u etanolu koji je korišćen kao rastvarač. Nanočestice silike su dodate sa različitim sadržajem od 1, 3 i 5 mas.% SiO2 i modifikovane γ-aminopropiltrietoksi silanom (AMEO silanom). Istražen je uticaj procesnih parametara elektrospininga na nanokompozitna vlakna PVB-SiO2. Struktura PVB-SiO2 nanokompozitnih vlakana je proučavana pomoću optičke mikroskopije i skenirajuće elektronske mikroskopije (SEM). Morfologija proizvedenih nanokompozitnih vlakana i njihova raspodela je analizirana u Image Pro Plus softveru. .
PB  - Military Technical Institute, Belgrade
T2  - Scientific Technical Review
T1  - The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process
T1  - Analiza formiranja PVB-SiO2 nanokompozitnih vlakana pomoću elektrospining procesa
EP  - 38
IS  - 3-4
SP  - 34
VL  - 61
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1791
ER  - 

@article{
author = "Obradović, Vera and Kojović, Aleksandar and Stojanović, Dušica and Nikolić, Nebojša and Živković, Irena and Uskoković, Petar and Aleksić, Radoslav",
year = "2011",
abstract = "The poly (vinyl butyral)-silica (PVB-SiO2) nanofibers were obtained by the electrospinning process. The experiments were carried out with PVB solution in concentration of 10 wt.% where ethanol was used as the solvent. The silica nanoparticles were added in the solution in different contents of 1, 3 and 5 wt.% SiO2 and nanoparticles were modified with γ-aminopropyltriethoxysilane (AMEO silane). The impacts of the parameters of the electrospinning process and the silica nanoparticles on the produced PVB-SiO2 nanocomposite fibers were tested. The structures of the PVB-SiO2 nanocomposite fibers were investigated using optical microscopy and scanning electron microscopy (SEM). The morphology and distribution of the resulting nanofibers were analyzed using the software Image-Pro Plus. ., Poli (vinil butiral)-silika (PVB-SiO2) nanovlakna su dobijena metodom elektrospininga. Eksperimenti su izvedeni u rastvoru 10 mas.% PVB-a u etanolu koji je korišćen kao rastvarač. Nanočestice silike su dodate sa različitim sadržajem od 1, 3 i 5 mas.% SiO2 i modifikovane γ-aminopropiltrietoksi silanom (AMEO silanom). Istražen je uticaj procesnih parametara elektrospininga na nanokompozitna vlakna PVB-SiO2. Struktura PVB-SiO2 nanokompozitnih vlakana je proučavana pomoću optičke mikroskopije i skenirajuće elektronske mikroskopije (SEM). Morfologija proizvedenih nanokompozitnih vlakana i njihova raspodela je analizirana u Image Pro Plus softveru. .",
publisher = "Military Technical Institute, Belgrade",
journal = "Scientific Technical Review",
title = "The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process, Analiza formiranja PVB-SiO2 nanokompozitnih vlakana pomoću elektrospining procesa",
pages = "38-34",
number = "3-4",
volume = "61",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1791"
}

Obradović, V., Kojović, A., Stojanović, D., Nikolić, N., Živković, I., Uskoković, P.,& Aleksić, R.. (2011). The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process. in Scientific Technical Review
Military Technical Institute, Belgrade., 61(3-4), 34-38.
https://hdl.handle.net/21.15107/rcub_technorep_1791

Obradović V, Kojović A, Stojanović D, Nikolić N, Živković I, Uskoković P, Aleksić R. The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process. in Scientific Technical Review. 2011;61(3-4):34-38.
https://hdl.handle.net/21.15107/rcub_technorep_1791 .

Obradović, Vera, Kojović, Aleksandar, Stojanović, Dušica, Nikolić, Nebojša, Živković, Irena, Uskoković, Petar, Aleksić, Radoslav, "The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process" in Scientific Technical Review, 61, no. 3-4 (2011):34-38,
https://hdl.handle.net/21.15107/rcub_technorep_1791 .

TY  - JOUR
AU  - Obradović, Vera
AU  - Kojović, Aleksandar
AU  - Stojanović, Dušica
AU  - Nikolić, Nebojša
AU  - Živković, Irena
AU  - Uskoković, Petar
AU  - Aleksić, Radoslav
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1758
AB  - The poly (vinyl butyral)-silica (PVB-SiO2) nanofibers were obtained by the electrospinning process. The experiments were carried out with PVB solution in concentration of 10 wt.% where ethanol was used as the solvent. The silica nanoparticles were added in the solution in different contents of 1, 3 and 5 wt.% SiO2 and nanoparticles were modified with γ-aminopropyltriethoxysilane (AMEO silane). The impacts of the parameters of the electrospinning process and the silica nanoparticles on the produced PVB-SiO2 nanocomposite fibers were tested. The structures of the PVB-SiO2 nanocomposite fibers were investigated using optical microscopy and scanning electron microscopy (SEM). The morphology and distribution of the resulting nanofibers were analyzed using the software Image-Pro Plus. .
AB  - Poli (vinil butiral)-silika (PVB-SiO2) nanovlakna su dobijena metodom elektrospininga. Eksperimenti su izvedeni u rastvoru 10 mas.% PVB-a u etanolu koji je korišćen kao rastvarač. Nanočestice silike su dodate sa različitim sadržajem od 1, 3 i 5 mas.% SiO2 i modifikovane γ-aminopropiltrietoksi silanom (AMEO silanom). Istražen je uticaj procesnih parametara elektrospininga na nanokompozitna vlakna PVB-SiO2. Struktura PVB-SiO2 nanokompozitnih vlakana je proučavana pomoću optičke mikroskopije i skenirajuće elektronske mikroskopije (SEM). Morfologija proizvedenih nanokompozitnih vlakana i njihova raspodela je analizirana u Image Pro Plus softveru. .
PB  - Vojnotehnički institut, Beograd
T2  - Scientific Technical Review
T1  - The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process
T1  - Analiza formiranja PVB-SiO2 nanokompozitnih vlakana pomoću elektrospining procesa
EP  - 38
IS  - 3-4
SP  - 34
VL  - 61
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1758
ER  - 

@article{
author = "Obradović, Vera and Kojović, Aleksandar and Stojanović, Dušica and Nikolić, Nebojša and Živković, Irena and Uskoković, Petar and Aleksić, Radoslav",
year = "2011",
abstract = "The poly (vinyl butyral)-silica (PVB-SiO2) nanofibers were obtained by the electrospinning process. The experiments were carried out with PVB solution in concentration of 10 wt.% where ethanol was used as the solvent. The silica nanoparticles were added in the solution in different contents of 1, 3 and 5 wt.% SiO2 and nanoparticles were modified with γ-aminopropyltriethoxysilane (AMEO silane). The impacts of the parameters of the electrospinning process and the silica nanoparticles on the produced PVB-SiO2 nanocomposite fibers were tested. The structures of the PVB-SiO2 nanocomposite fibers were investigated using optical microscopy and scanning electron microscopy (SEM). The morphology and distribution of the resulting nanofibers were analyzed using the software Image-Pro Plus. ., Poli (vinil butiral)-silika (PVB-SiO2) nanovlakna su dobijena metodom elektrospininga. Eksperimenti su izvedeni u rastvoru 10 mas.% PVB-a u etanolu koji je korišćen kao rastvarač. Nanočestice silike su dodate sa različitim sadržajem od 1, 3 i 5 mas.% SiO2 i modifikovane γ-aminopropiltrietoksi silanom (AMEO silanom). Istražen je uticaj procesnih parametara elektrospininga na nanokompozitna vlakna PVB-SiO2. Struktura PVB-SiO2 nanokompozitnih vlakana je proučavana pomoću optičke mikroskopije i skenirajuće elektronske mikroskopije (SEM). Morfologija proizvedenih nanokompozitnih vlakana i njihova raspodela je analizirana u Image Pro Plus softveru. .",
publisher = "Vojnotehnički institut, Beograd",
journal = "Scientific Technical Review",
title = "The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process, Analiza formiranja PVB-SiO2 nanokompozitnih vlakana pomoću elektrospining procesa",
pages = "38-34",
number = "3-4",
volume = "61",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1758"
}

Obradović, V., Kojović, A., Stojanović, D., Nikolić, N., Živković, I., Uskoković, P.,& Aleksić, R.. (2011). The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process. in Scientific Technical Review
Vojnotehnički institut, Beograd., 61(3-4), 34-38.
https://hdl.handle.net/21.15107/rcub_technorep_1758

Obradović V, Kojović A, Stojanović D, Nikolić N, Živković I, Uskoković P, Aleksić R. The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process. in Scientific Technical Review. 2011;61(3-4):34-38.
https://hdl.handle.net/21.15107/rcub_technorep_1758 .

Obradović, Vera, Kojović, Aleksandar, Stojanović, Dušica, Nikolić, Nebojša, Živković, Irena, Uskoković, Petar, Aleksić, Radoslav, "The analysis of forming PVB-SiO2 nanocomposite fibers by the electrospinning process" in Scientific Technical Review, 61, no. 3-4 (2011):34-38,
https://hdl.handle.net/21.15107/rcub_technorep_1758 .

TY  - JOUR
AU  - Kojović, Aleksandar
AU  - Živković, Irena
PY  - 2009
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1450
AB  - Embedding optical fiber sensors within laminar thermoplastic composite material results in forming a system known as 'smart structure'. These sensors present the information about the inner structure health during the material exploitation and especially in the case of exterior impacts when a geometric configuration or the property changes of the material should be expected. This paper evaluates the feasibility of the real-time monitoring of indentation and low energy impact damage in composite laminates from indentation loading and Charpy pendulum impact, using the embedded intensity-based optical fiber sensors. An optical fiber sensing system, which relies solely on monitoring light intensity for providing the indication of the composite structural health, offers simplicity in design and cost-effectiveness. For this, aramid/polyvinylbutyral (PVB) and aramid/metal/PVB laminates with embedded optical fibers were fabricated. Four configurations of woven composites were tested, namely, aramid/PVB, and aramid/metal/PVB in three stacking sequences of aramid and metallic woven layers. The initiation of damage and fracture during testing was detected by observation of the intensity drop of light signal transmitted through an optical fiber.
PB  - Association of the Chemical Engineers of Serbia
T2  - Chemical Industry & Chemical Engineering Quarterly
T1  - Damage detection of hybrid aramid/metal-PVB composite materials using optical fiber sensors
EP  - 142
IS  - 3
SP  - 137
VL  - 15
DO  - 10.2298/CICEQ0903137K
ER  - 

@article{
author = "Kojović, Aleksandar and Živković, Irena",
year = "2009",
abstract = "Embedding optical fiber sensors within laminar thermoplastic composite material results in forming a system known as 'smart structure'. These sensors present the information about the inner structure health during the material exploitation and especially in the case of exterior impacts when a geometric configuration or the property changes of the material should be expected. This paper evaluates the feasibility of the real-time monitoring of indentation and low energy impact damage in composite laminates from indentation loading and Charpy pendulum impact, using the embedded intensity-based optical fiber sensors. An optical fiber sensing system, which relies solely on monitoring light intensity for providing the indication of the composite structural health, offers simplicity in design and cost-effectiveness. For this, aramid/polyvinylbutyral (PVB) and aramid/metal/PVB laminates with embedded optical fibers were fabricated. Four configurations of woven composites were tested, namely, aramid/PVB, and aramid/metal/PVB in three stacking sequences of aramid and metallic woven layers. The initiation of damage and fracture during testing was detected by observation of the intensity drop of light signal transmitted through an optical fiber.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Chemical Industry & Chemical Engineering Quarterly",
title = "Damage detection of hybrid aramid/metal-PVB composite materials using optical fiber sensors",
pages = "142-137",
number = "3",
volume = "15",
doi = "10.2298/CICEQ0903137K"
}

Kojović, A.,& Živković, I.. (2009). Damage detection of hybrid aramid/metal-PVB composite materials using optical fiber sensors. in Chemical Industry & Chemical Engineering Quarterly
Association of the Chemical Engineers of Serbia., 15(3), 137-142.
https://doi.org/10.2298/CICEQ0903137K

Kojović A, Živković I. Damage detection of hybrid aramid/metal-PVB composite materials using optical fiber sensors. in Chemical Industry & Chemical Engineering Quarterly. 2009;15(3):137-142.
doi:10.2298/CICEQ0903137K .

Kojović, Aleksandar, Živković, Irena, "Damage detection of hybrid aramid/metal-PVB composite materials using optical fiber sensors" in Chemical Industry & Chemical Engineering Quarterly, 15, no. 3 (2009):137-142,
https://doi.org/10.2298/CICEQ0903137K . .

TY  - JOUR
AU  - Živković, Irena
AU  - Maksimović, Katarina
AU  - Kojović, Aleksandar
AU  - Aleksić, Radoslav
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1270
AB  - In order to obtain a composite material with desired improved resistance to penetration of ballistic projectiles, a poly(p-phenyleneterephthalamide) reinforced laminar thermoplastic composite material has been made. This paper describes the procedure of manufacturing such a composite material, as well as the procedure of embedding fiberoptic sensors (FOS) in it, using the hot-melt method. Optical fibers were embedded in specimens of composite materials as intensity-based real-time damage detection sensors. Manufactured composite specimens with embedded FOS were subjected to static loading indentation. The initiation of damage and fracture during testing was detected by observation of the characteristic changing of the optical signal. The results of the experiments confirmed that optical fibers might be applied as intensity sensors in real-time monitoring of structural changes in thermoplastic laminate composite materials. The finite element method (FEM) modeling was used to analyze stress and displacement distributions through the layered composite plate, caused by indentation and to simulate the contact problem - projectile/composite plate. The finite element simulation results of the considered layered composite plate have shown very good agreement with the experimental results.
AB  - Sa ciljem dobijanja kompozitnog materijala poboljšane otpornosti na proboj balističkog projektila, napravljen je poli(p-fenilentereftalamidom) ojačan laminarni termoplastični kompozitni materijal. Ovaj rad opisuje postupak izrade ovog kompozitnog materijala, kao i postupak ugradnje fiber-optičkih senzora (FOS) u isti, upotrebom metode toplog presovanja. Optička vlakna su ugrađena u uzorke kompozitnih materijala kao intenzitetni senzori za detekciju oštećenja u realnom vremenu. Izrađeni kompozitni uzorci sa ugrađenim FOS su izlagani statičkom opterećenju utiskivanjem. Inicijalno oštećenje i lom tokom ispitivanja su detektovani padom inteziteta svetlosnog signala propuštenog kroz optička vlakna. Rezultati eksperimenata su potvrdili opravdanost upotrebe optičkih vlakana kao intenzitetnih senzora za praćenje strukturalnih promena u termoplastičnim laminarnim kompozitnim materijalima u realnom vremenu. Za analizu raspodele napona i deformacija po debljini višeslojne kompozitne ploče, pod dejstvom utiskivanja, korišćen je metod konačnih elemenata (MKE). Primenom MKE je simuliran kontaktni problem projektil/kompozitna ploča. Rezultati MKE analize razmatrane kompozitne ploče su pokazali odlično slaganje sa eksperimentalnim rezultatima.
PB  - Military Technical Institute, Belgrade
T2  - Scientific Technical Review
T1  - Analysis of smart aramid fiber reinforced laminar thermoplastic composite material under static loading
T1  - Analiza SMART aramidnim vlaknom ojačanih laminarnih termoplastičnih kompozitnih materijala tokom statičkog opterećivanja: poređenje eksperimentalnih rezultata i numeričke simulacije
EP  - 31
IS  - 1
SP  - 25
VL  - 58
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1270
ER  - 

@article{
author = "Živković, Irena and Maksimović, Katarina and Kojović, Aleksandar and Aleksić, Radoslav",
year = "2008",
abstract = "In order to obtain a composite material with desired improved resistance to penetration of ballistic projectiles, a poly(p-phenyleneterephthalamide) reinforced laminar thermoplastic composite material has been made. This paper describes the procedure of manufacturing such a composite material, as well as the procedure of embedding fiberoptic sensors (FOS) in it, using the hot-melt method. Optical fibers were embedded in specimens of composite materials as intensity-based real-time damage detection sensors. Manufactured composite specimens with embedded FOS were subjected to static loading indentation. The initiation of damage and fracture during testing was detected by observation of the characteristic changing of the optical signal. The results of the experiments confirmed that optical fibers might be applied as intensity sensors in real-time monitoring of structural changes in thermoplastic laminate composite materials. The finite element method (FEM) modeling was used to analyze stress and displacement distributions through the layered composite plate, caused by indentation and to simulate the contact problem - projectile/composite plate. The finite element simulation results of the considered layered composite plate have shown very good agreement with the experimental results., Sa ciljem dobijanja kompozitnog materijala poboljšane otpornosti na proboj balističkog projektila, napravljen je poli(p-fenilentereftalamidom) ojačan laminarni termoplastični kompozitni materijal. Ovaj rad opisuje postupak izrade ovog kompozitnog materijala, kao i postupak ugradnje fiber-optičkih senzora (FOS) u isti, upotrebom metode toplog presovanja. Optička vlakna su ugrađena u uzorke kompozitnih materijala kao intenzitetni senzori za detekciju oštećenja u realnom vremenu. Izrađeni kompozitni uzorci sa ugrađenim FOS su izlagani statičkom opterećenju utiskivanjem. Inicijalno oštećenje i lom tokom ispitivanja su detektovani padom inteziteta svetlosnog signala propuštenog kroz optička vlakna. Rezultati eksperimenata su potvrdili opravdanost upotrebe optičkih vlakana kao intenzitetnih senzora za praćenje strukturalnih promena u termoplastičnim laminarnim kompozitnim materijalima u realnom vremenu. Za analizu raspodele napona i deformacija po debljini višeslojne kompozitne ploče, pod dejstvom utiskivanja, korišćen je metod konačnih elemenata (MKE). Primenom MKE je simuliran kontaktni problem projektil/kompozitna ploča. Rezultati MKE analize razmatrane kompozitne ploče su pokazali odlično slaganje sa eksperimentalnim rezultatima.",
publisher = "Military Technical Institute, Belgrade",
journal = "Scientific Technical Review",
title = "Analysis of smart aramid fiber reinforced laminar thermoplastic composite material under static loading, Analiza SMART aramidnim vlaknom ojačanih laminarnih termoplastičnih kompozitnih materijala tokom statičkog opterećivanja: poređenje eksperimentalnih rezultata i numeričke simulacije",
pages = "31-25",
number = "1",
volume = "58",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1270"
}

Živković, I., Maksimović, K., Kojović, A.,& Aleksić, R.. (2008). Analysis of smart aramid fiber reinforced laminar thermoplastic composite material under static loading. in Scientific Technical Review
Military Technical Institute, Belgrade., 58(1), 25-31.
https://hdl.handle.net/21.15107/rcub_technorep_1270

Živković I, Maksimović K, Kojović A, Aleksić R. Analysis of smart aramid fiber reinforced laminar thermoplastic composite material under static loading. in Scientific Technical Review. 2008;58(1):25-31.
https://hdl.handle.net/21.15107/rcub_technorep_1270 .

Živković, Irena, Maksimović, Katarina, Kojović, Aleksandar, Aleksić, Radoslav, "Analysis of smart aramid fiber reinforced laminar thermoplastic composite material under static loading" in Scientific Technical Review, 58, no. 1 (2008):25-31,
https://hdl.handle.net/21.15107/rcub_technorep_1270 .

TY  - CONF
AU  - Kojović, Aleksandar
AU  - Živković, Irena
AU  - Brajović, Ljiljana
AU  - Mitraković, Dragan
AU  - Aleksić, Radoslav
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/860
PB  - 16th European Conference of Fracture
C3  - Fracture of Nano and Engineering Materials and Structures - Proceedings of the 16th European Confere
T1  - Laminar composite materials damage monitoring by embedded optical fibers
EP  - 1036
SP  - 1035
DO  - 10.1007/1-4020-4972-2_513
ER  - 

@conference{
author = "Kojović, Aleksandar and Živković, Irena and Brajović, Ljiljana and Mitraković, Dragan and Aleksić, Radoslav",
year = "2006",
publisher = "16th European Conference of Fracture",
journal = "Fracture of Nano and Engineering Materials and Structures - Proceedings of the 16th European Confere",
title = "Laminar composite materials damage monitoring by embedded optical fibers",
pages = "1036-1035",
doi = "10.1007/1-4020-4972-2_513"
}

Kojović, A., Živković, I., Brajović, L., Mitraković, D.,& Aleksić, R.. (2006). Laminar composite materials damage monitoring by embedded optical fibers. in Fracture of Nano and Engineering Materials and Structures - Proceedings of the 16th European Confere
16th European Conference of Fracture., 1035-1036.
https://doi.org/10.1007/1-4020-4972-2_513

Kojović A, Živković I, Brajović L, Mitraković D, Aleksić R. Laminar composite materials damage monitoring by embedded optical fibers. in Fracture of Nano and Engineering Materials and Structures - Proceedings of the 16th European Confere. 2006;:1035-1036.
doi:10.1007/1-4020-4972-2_513 .

Kojović, Aleksandar, Živković, Irena, Brajović, Ljiljana, Mitraković, Dragan, Aleksić, Radoslav, "Laminar composite materials damage monitoring by embedded optical fibers" in Fracture of Nano and Engineering Materials and Structures - Proceedings of the 16th European Confere (2006):1035-1036,
https://doi.org/10.1007/1-4020-4972-2_513 . .

TY  - JOUR
AU  - Kojović, Aleksandar
AU  - Živković, Irena
AU  - Brajović, Ljiljana
AU  - Mitraković, Dragan
AU  - Aleksić, Radoslav
PY  - 2006
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/951
AB  - This paper investigates the possibility of applying optical fibers as sensors for investigating low energy impact damage in laminar thermoplastic composite materials, in real time. Impact toughness testing by a Charpy impact pendulum with different loads was conducted in order to determine the method for comparative measurement of the resulting damage in the material. For that purpose intensity-based optical fibers were built in to specimens of composite materials with Kevlar 129 (the DuPont registered trade-mark for poly(p-phenylene terephthalamide)) woven fabric as reinforcement and thermoplastic PVB (poly(vinyl butyral)) as the matrix. In some specimens part of the layers of Kevlar was replaced with metal mesh (50% or 33% of the layers). Experimental testing was conducted in order to observe and analyze the response of the material under multiple low-energy impacts. Light from the light-emitting diode (LED) was launched to the embedded optical fiber and was propagated to the phototransistor-based photo detector. During each impact, the signal level, which is proportional to the light intensity in the optical fiber, drops and then slowly recovers. The obtained signals were analyzed to determine the appropriate method for real time damage monitoring. The major part of the damage occurs during impact. The damage reflects as a local, temporary release of strain in the optical fiber and an increase of the signal level. The obtained results show that intensity-based optical fibers could be used for measuring the damage in laminar thermoplastic composite materials. The acquired optical fiber signals depend on the type of material, but the same set of rules (relatively different, depending on the type of material) could be specified. Using real time measurement of the signal during impact and appropriate analysis enables quantitative evaluation of the impact damage in the material. Existing methods in most cases use just the intensity of the signal before and after the impact, as the measure of damage. This method could be used to monitor the damage in real time, giving warnings before fatal damage occurs.
AB  - Ovaj rad istražuje mogućnost primene optičkih vlakana kao senzora za ispitivanje oštećenja laminarnih termoplastičnih kompozitnih materijala nastalih usled udara niske energije, u realnom vremenu. Ispitivanje materijala na otpornost pri udaru niske energije, različitih nivoa, je vršeno Šarpijevim klatnom radi pronalaženja metodologije za komparativna merenja rezultujućih oštećenja u materijalu. Iz tog razloga su u uzorke kompozitnih materijala sa ojačanjem u vidu kombinacije Kevlara 129 i metalne mrežice, ili Kevlara 129 i termoplastičnim poli(vinil butiralom) kao matricom, ugrađeni fiberoptički senzori intenzitetnog tipa. Dobijeni rezultati su potvrdili opravdanost upotrebe optičkih vlakana kao senzora za detekciju oštećenja u laminarnim termoplastičnim kompozitnim materijalima u realnom vremenu.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Damage detection in laminar thermoplastic composite materials by means of embedded optical fibers
T1  - Detektovanje oštećenja u laminarnim termoplastičnim kompozitnim materijalima korišćenjem ugrađenih optičkih vlakana
EP  - 179
IS  - 7-8
SP  - 176
VL  - 60
DO  - 10.2298/HEMIND0608176K
ER  - 

@article{
author = "Kojović, Aleksandar and Živković, Irena and Brajović, Ljiljana and Mitraković, Dragan and Aleksić, Radoslav",
year = "2006",
abstract = "This paper investigates the possibility of applying optical fibers as sensors for investigating low energy impact damage in laminar thermoplastic composite materials, in real time. Impact toughness testing by a Charpy impact pendulum with different loads was conducted in order to determine the method for comparative measurement of the resulting damage in the material. For that purpose intensity-based optical fibers were built in to specimens of composite materials with Kevlar 129 (the DuPont registered trade-mark for poly(p-phenylene terephthalamide)) woven fabric as reinforcement and thermoplastic PVB (poly(vinyl butyral)) as the matrix. In some specimens part of the layers of Kevlar was replaced with metal mesh (50% or 33% of the layers). Experimental testing was conducted in order to observe and analyze the response of the material under multiple low-energy impacts. Light from the light-emitting diode (LED) was launched to the embedded optical fiber and was propagated to the phototransistor-based photo detector. During each impact, the signal level, which is proportional to the light intensity in the optical fiber, drops and then slowly recovers. The obtained signals were analyzed to determine the appropriate method for real time damage monitoring. The major part of the damage occurs during impact. The damage reflects as a local, temporary release of strain in the optical fiber and an increase of the signal level. The obtained results show that intensity-based optical fibers could be used for measuring the damage in laminar thermoplastic composite materials. The acquired optical fiber signals depend on the type of material, but the same set of rules (relatively different, depending on the type of material) could be specified. Using real time measurement of the signal during impact and appropriate analysis enables quantitative evaluation of the impact damage in the material. Existing methods in most cases use just the intensity of the signal before and after the impact, as the measure of damage. This method could be used to monitor the damage in real time, giving warnings before fatal damage occurs., Ovaj rad istražuje mogućnost primene optičkih vlakana kao senzora za ispitivanje oštećenja laminarnih termoplastičnih kompozitnih materijala nastalih usled udara niske energije, u realnom vremenu. Ispitivanje materijala na otpornost pri udaru niske energije, različitih nivoa, je vršeno Šarpijevim klatnom radi pronalaženja metodologije za komparativna merenja rezultujućih oštećenja u materijalu. Iz tog razloga su u uzorke kompozitnih materijala sa ojačanjem u vidu kombinacije Kevlara 129 i metalne mrežice, ili Kevlara 129 i termoplastičnim poli(vinil butiralom) kao matricom, ugrađeni fiberoptički senzori intenzitetnog tipa. Dobijeni rezultati su potvrdili opravdanost upotrebe optičkih vlakana kao senzora za detekciju oštećenja u laminarnim termoplastičnim kompozitnim materijalima u realnom vremenu.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Damage detection in laminar thermoplastic composite materials by means of embedded optical fibers, Detektovanje oštećenja u laminarnim termoplastičnim kompozitnim materijalima korišćenjem ugrađenih optičkih vlakana",
pages = "179-176",
number = "7-8",
volume = "60",
doi = "10.2298/HEMIND0608176K"
}

Kojović, A., Živković, I., Brajović, L., Mitraković, D.,& Aleksić, R.. (2006). Damage detection in laminar thermoplastic composite materials by means of embedded optical fibers. in Hemijska industrija
Association of Chemical Engineers of Serbia., 60(7-8), 176-179.
https://doi.org/10.2298/HEMIND0608176K

Kojović A, Živković I, Brajović L, Mitraković D, Aleksić R. Damage detection in laminar thermoplastic composite materials by means of embedded optical fibers. in Hemijska industrija. 2006;60(7-8):176-179.
doi:10.2298/HEMIND0608176K .

Kojović, Aleksandar, Živković, Irena, Brajović, Ljiljana, Mitraković, Dragan, Aleksić, Radoslav, "Damage detection in laminar thermoplastic composite materials by means of embedded optical fibers" in Hemijska industrija, 60, no. 7-8 (2006):176-179,
https://doi.org/10.2298/HEMIND0608176K . .