TY  - JOUR
AU  - Taboun, Abdulrraouf
AU  - Jovanović, Marija
AU  - Petrović, Miloš
AU  - Stajčić, Ivana
AU  - Pešić, Ivan
AU  - Stojanović, Dušica B.
AU  - Radojević, Vesna
PY  - 2024
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7455
AB  - The aim of this study is to investigate the influence of cross-linking and reinforcements in gelatin on the physico-mechanical properties of obtained composites. The gelatin-based composites cross-linked with citric acid (CA) were prepared: gelatin type B (GB) and β-tricalcium phosphate (β-TCP) and novel hybrid composite GB with β-TCP and hydroxyapatite (HAp) particles, and their structure, thermal, and mechanical properties were compared with pure gelatin B samples. FTIR analysis revealed that no chemical interaction between the reinforcements and gelatin matrix was established during the processing of hybrid composites by the solution casting method, proving the particles had no influence on GB cross-linking. The morphological investigation of hybrid composites revealed that cross-linking with CA improved the dispersion of particles, which further led to an increase in mechanical performance. The microindentation test showed that the hardness value was increased by up to 449%, which shows the high potential of β-TCP and HAp particle reinforcement combined with CA as a cross-linking agent. Furthermore, the reduced modulus of elasticity was increased by up to 288%. Results of the MTT assay on L929 cells have revealed that the hybrid composite GB-TCP-HA-CA was not cytotoxic. These results showed that GB cross-linked with CA and reinforced with different calcium phosphates presents a valuable novel material with potential applications in dentistry.
PB  - MDPI
T2  - Polymers
T1  - Citric Acid Cross-Linked Gelatin-Based Composites with Improved Microhardness
IS  - 8
SP  - 1077
VL  - 16
DO  - 10.3390/polym16081077
ER  - 

@article{
author = "Taboun, Abdulrraouf and Jovanović, Marija and Petrović, Miloš and Stajčić, Ivana and Pešić, Ivan and Stojanović, Dušica B. and Radojević, Vesna",
year = "2024",
abstract = "The aim of this study is to investigate the influence of cross-linking and reinforcements in gelatin on the physico-mechanical properties of obtained composites. The gelatin-based composites cross-linked with citric acid (CA) were prepared: gelatin type B (GB) and β-tricalcium phosphate (β-TCP) and novel hybrid composite GB with β-TCP and hydroxyapatite (HAp) particles, and their structure, thermal, and mechanical properties were compared with pure gelatin B samples. FTIR analysis revealed that no chemical interaction between the reinforcements and gelatin matrix was established during the processing of hybrid composites by the solution casting method, proving the particles had no influence on GB cross-linking. The morphological investigation of hybrid composites revealed that cross-linking with CA improved the dispersion of particles, which further led to an increase in mechanical performance. The microindentation test showed that the hardness value was increased by up to 449%, which shows the high potential of β-TCP and HAp particle reinforcement combined with CA as a cross-linking agent. Furthermore, the reduced modulus of elasticity was increased by up to 288%. Results of the MTT assay on L929 cells have revealed that the hybrid composite GB-TCP-HA-CA was not cytotoxic. These results showed that GB cross-linked with CA and reinforced with different calcium phosphates presents a valuable novel material with potential applications in dentistry.",
publisher = "MDPI",
journal = "Polymers",
title = "Citric Acid Cross-Linked Gelatin-Based Composites with Improved Microhardness",
number = "8",
pages = "1077",
volume = "16",
doi = "10.3390/polym16081077"
}

Taboun, A., Jovanović, M., Petrović, M., Stajčić, I., Pešić, I., Stojanović, D. B.,& Radojević, V.. (2024). Citric Acid Cross-Linked Gelatin-Based Composites with Improved Microhardness. in Polymers
MDPI., 16(8), 1077.
https://doi.org/10.3390/polym16081077

Taboun A, Jovanović M, Petrović M, Stajčić I, Pešić I, Stojanović DB, Radojević V. Citric Acid Cross-Linked Gelatin-Based Composites with Improved Microhardness. in Polymers. 2024;16(8):1077.
doi:10.3390/polym16081077 .

Taboun, Abdulrraouf, Jovanović, Marija, Petrović, Miloš, Stajčić, Ivana, Pešić, Ivan, Stojanović, Dušica B., Radojević, Vesna, "Citric Acid Cross-Linked Gelatin-Based Composites with Improved Microhardness" in Polymers, 16, no. 8 (2024):1077,
https://doi.org/10.3390/polym16081077 . .

TY  - JOUR
AU  - Elhmali, Houda Taher
AU  - Stajčić, Ivana
AU  - Stajčić, Aleksandar
AU  - Pešić, Ivan
AU  - Jovanović, Marija
AU  - Petrović, Miloš
AU  - Radojević, Vesna
PY  - 2024
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7157
AB  - While dental poly methyl methacrylate(PMMA) possesses distinctive qualities such as ease of fabrication, cost-effectiveness, and favorable physical and mechanical properties, these attributes alone are inadequate to impart the necessary impact strength and hardness. Consequently, pure PMMA is less suitable for dental applications. This research focused on the incorporation of Strontium titanate (SrTiO3-STO) and hybrid filler STO/Manganese oxide (MnO2) to improve impact resistance and hardness. The potential of STO in reinforcing PMMA is poorly investigated, while hybrid filler STO/MnO2 has not been presented yet. Differential scanning calorimetry is conducted in order to investigate the agglomeration influence on the PMMA glass transition temperature (Tg), as well as the leaching of residual monomer and volatile additives that could pose a threat to human health. It has been determined that agglomeration with 1 wt% loading had no influence on Tg, while the first scan revealed differences in evaporation of small molecules, in favor of composite PMMA-STO/MnO2, which showed the trapping potential of volatiles. Investigations of mechanical properties have revealed the significant influence of hybrid STO/MnO2 filler on microhardness and total absorbed impact energy, which were increased by 89.9% and 145.4%, respectively. Results presented in this study revealed the reinforcing potential of hybrid nanoparticles that could find application in other polymers as well.
PB  - MDPI
T2  - Polymers
T1  - Influence of Novel SrTiO3/MnO2 Hybrid Nanoparticles on Poly(methyl methacrylate) Thermal and Mechanical Behavior
IS  - 2
SP  - 278
VL  - 16
DO  - 10.3390/polym16020278
ER  - 

@article{
author = "Elhmali, Houda Taher and Stajčić, Ivana and Stajčić, Aleksandar and Pešić, Ivan and Jovanović, Marija and Petrović, Miloš and Radojević, Vesna",
year = "2024",
abstract = "While dental poly methyl methacrylate(PMMA) possesses distinctive qualities such as ease of fabrication, cost-effectiveness, and favorable physical and mechanical properties, these attributes alone are inadequate to impart the necessary impact strength and hardness. Consequently, pure PMMA is less suitable for dental applications. This research focused on the incorporation of Strontium titanate (SrTiO3-STO) and hybrid filler STO/Manganese oxide (MnO2) to improve impact resistance and hardness. The potential of STO in reinforcing PMMA is poorly investigated, while hybrid filler STO/MnO2 has not been presented yet. Differential scanning calorimetry is conducted in order to investigate the agglomeration influence on the PMMA glass transition temperature (Tg), as well as the leaching of residual monomer and volatile additives that could pose a threat to human health. It has been determined that agglomeration with 1 wt% loading had no influence on Tg, while the first scan revealed differences in evaporation of small molecules, in favor of composite PMMA-STO/MnO2, which showed the trapping potential of volatiles. Investigations of mechanical properties have revealed the significant influence of hybrid STO/MnO2 filler on microhardness and total absorbed impact energy, which were increased by 89.9% and 145.4%, respectively. Results presented in this study revealed the reinforcing potential of hybrid nanoparticles that could find application in other polymers as well.",
publisher = "MDPI",
journal = "Polymers",
title = "Influence of Novel SrTiO3/MnO2 Hybrid Nanoparticles on Poly(methyl methacrylate) Thermal and Mechanical Behavior",
number = "2",
pages = "278",
volume = "16",
doi = "10.3390/polym16020278"
}

Elhmali, H. T., Stajčić, I., Stajčić, A., Pešić, I., Jovanović, M., Petrović, M.,& Radojević, V.. (2024). Influence of Novel SrTiO3/MnO2 Hybrid Nanoparticles on Poly(methyl methacrylate) Thermal and Mechanical Behavior. in Polymers
MDPI., 16(2), 278.
https://doi.org/10.3390/polym16020278

Elhmali HT, Stajčić I, Stajčić A, Pešić I, Jovanović M, Petrović M, Radojević V. Influence of Novel SrTiO3/MnO2 Hybrid Nanoparticles on Poly(methyl methacrylate) Thermal and Mechanical Behavior. in Polymers. 2024;16(2):278.
doi:10.3390/polym16020278 .

Elhmali, Houda Taher, Stajčić, Ivana, Stajčić, Aleksandar, Pešić, Ivan, Jovanović, Marija, Petrović, Miloš, Radojević, Vesna, "Influence of Novel SrTiO3/MnO2 Hybrid Nanoparticles on Poly(methyl methacrylate) Thermal and Mechanical Behavior" in Polymers, 16, no. 2 (2024):278,
https://doi.org/10.3390/polym16020278 . .

TY  - JOUR
AU  - Pešić, Ivan
AU  - Petrović, Miloš
AU  - Vuksanović, Marija
AU  - Popović, Maja
AU  - Rabasović, Maja
AU  - Šević, Dragutin
AU  - Radojević, Vesna
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6383
AB  - Processing and characterization of PMMA-MXene composites were investigated. γ-Methacryloxypropyltrimethoxy (MEMO) silane was used to modify the surface of MXenes and improve the compatibility between MXenes and the polymer. The FTIR analysis revealed the formation of a chemical bond between MXene and MEMO silane, while the XPS analysis confirmed the presence of silicon in the functionalized MXene. PMMA composites with non-functionalized and functionalized MXene were prepared using a solution casting method. Tensile tests showed that, compared to neat PMMA, Young’s modulus increased in both composites by 22.1 and 27.6%, respectively. As a result of coupling between the PMMA matrix and the surface-modified MXenes, the tensile strength also increased by about 37%. In addition, optical spectroscopy showed higher absorption for the composite with surface-modified MXenes and short-lived fluorescence with emission intensity sensitive to the crumpling of functionalized MXene nanosheets.
PB  - Taylor & Francis Group
T2  - Nanocomposites
T1  - Structural, optical and mechanical characterization of PMMA- MXene composites functionalized with MEMO silane
EP  - 226
IS  - 1
SP  - 215
VL  - 8
DO  - 10.1080/20550324.2023.2168844
ER  - 

@article{
author = "Pešić, Ivan and Petrović, Miloš and Vuksanović, Marija and Popović, Maja and Rabasović, Maja and Šević, Dragutin and Radojević, Vesna",
year = "2022",
abstract = "Processing and characterization of PMMA-MXene composites were investigated. γ-Methacryloxypropyltrimethoxy (MEMO) silane was used to modify the surface of MXenes and improve the compatibility between MXenes and the polymer. The FTIR analysis revealed the formation of a chemical bond between MXene and MEMO silane, while the XPS analysis confirmed the presence of silicon in the functionalized MXene. PMMA composites with non-functionalized and functionalized MXene were prepared using a solution casting method. Tensile tests showed that, compared to neat PMMA, Young’s modulus increased in both composites by 22.1 and 27.6%, respectively. As a result of coupling between the PMMA matrix and the surface-modified MXenes, the tensile strength also increased by about 37%. In addition, optical spectroscopy showed higher absorption for the composite with surface-modified MXenes and short-lived fluorescence with emission intensity sensitive to the crumpling of functionalized MXene nanosheets.",
publisher = "Taylor & Francis Group",
journal = "Nanocomposites",
title = "Structural, optical and mechanical characterization of PMMA- MXene composites functionalized with MEMO silane",
pages = "226-215",
number = "1",
volume = "8",
doi = "10.1080/20550324.2023.2168844"
}

Pešić, I., Petrović, M., Vuksanović, M., Popović, M., Rabasović, M., Šević, D.,& Radojević, V.. (2022). Structural, optical and mechanical characterization of PMMA- MXene composites functionalized with MEMO silane. in Nanocomposites
Taylor & Francis Group., 8(1), 215-226.
https://doi.org/10.1080/20550324.2023.2168844

Pešić I, Petrović M, Vuksanović M, Popović M, Rabasović M, Šević D, Radojević V. Structural, optical and mechanical characterization of PMMA- MXene composites functionalized with MEMO silane. in Nanocomposites. 2022;8(1):215-226.
doi:10.1080/20550324.2023.2168844 .

Pešić, Ivan, Petrović, Miloš, Vuksanović, Marija, Popović, Maja, Rabasović, Maja, Šević, Dragutin, Radojević, Vesna, "Structural, optical and mechanical characterization of PMMA- MXene composites functionalized with MEMO silane" in Nanocomposites, 8, no. 1 (2022):215-226,
https://doi.org/10.1080/20550324.2023.2168844 . .

TY  - JOUR
AU  - Pešić, Jelena
AU  - Šolajić, Andrijana
AU  - Mitrić, Jelena
AU  - Gilić, Martina
AU  - Pešić, Ivan
AU  - Paunović, Novica
AU  - Romčević, Nebojša
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5139
AB  - The rich chemistries and unique morphologies of titanium carbide MXenes, made them strong candidates for many applications like sensors and electronic device materials. During the synthesis procedure, chemical etching, oxidation occurs and residual materials, like titanium-dioxide nanocrystals and nanosheets are often present in resulting material. As titanium-carbide MXenes are suggested to be used as additive in organic polymer matrices for production of nanocomposites, it is essential to consider the presence of the oxides and other residuals together with MXene flakes in synthesis results, and consequently in produced nanocomposite. In this study we present structural and optical characterization of such polymer nanocomposite titanium carbide/PMMA (Polymethyl methacrylate) consisting of Ti3C2, TiC2 MXenes and TiC, and TiO2 residues of synthesis in PMMA matrix, as a multicomponent nanocomposite. Using XRD, infra-red and Raman spectroscopy, followed by comparative study on the vibrational properties using density functional theory calculations, we characterize this nanocomposite. Further, the SEM measurements are performed, demonstrating the produced titanium-carbide-based flakes in nanocomposite are well defined and separated to nanosized grains, allowing us to use Maxwell–Garnet model to analyse infrared spectrum. This enables us to determine the presence of the optical modification of polymer matrices corresponding to a volume fraction of 0.25.
PB  - Springer
T2  - Optical and Quantum Electronics
T1  - Structural and optical characterization of titanium–carbide and polymethyl methacrylate based nanocomposite
IS  - 6
SP  - 354
VL  - 54
DO  - 10.1007/s11082-022-03674-z
ER  - 

@article{
author = "Pešić, Jelena and Šolajić, Andrijana and Mitrić, Jelena and Gilić, Martina and Pešić, Ivan and Paunović, Novica and Romčević, Nebojša",
year = "2022",
abstract = "The rich chemistries and unique morphologies of titanium carbide MXenes, made them strong candidates for many applications like sensors and electronic device materials. During the synthesis procedure, chemical etching, oxidation occurs and residual materials, like titanium-dioxide nanocrystals and nanosheets are often present in resulting material. As titanium-carbide MXenes are suggested to be used as additive in organic polymer matrices for production of nanocomposites, it is essential to consider the presence of the oxides and other residuals together with MXene flakes in synthesis results, and consequently in produced nanocomposite. In this study we present structural and optical characterization of such polymer nanocomposite titanium carbide/PMMA (Polymethyl methacrylate) consisting of Ti3C2, TiC2 MXenes and TiC, and TiO2 residues of synthesis in PMMA matrix, as a multicomponent nanocomposite. Using XRD, infra-red and Raman spectroscopy, followed by comparative study on the vibrational properties using density functional theory calculations, we characterize this nanocomposite. Further, the SEM measurements are performed, demonstrating the produced titanium-carbide-based flakes in nanocomposite are well defined and separated to nanosized grains, allowing us to use Maxwell–Garnet model to analyse infrared spectrum. This enables us to determine the presence of the optical modification of polymer matrices corresponding to a volume fraction of 0.25.",
publisher = "Springer",
journal = "Optical and Quantum Electronics",
title = "Structural and optical characterization of titanium–carbide and polymethyl methacrylate based nanocomposite",
number = "6",
pages = "354",
volume = "54",
doi = "10.1007/s11082-022-03674-z"
}

Pešić, J., Šolajić, A., Mitrić, J., Gilić, M., Pešić, I., Paunović, N.,& Romčević, N.. (2022). Structural and optical characterization of titanium–carbide and polymethyl methacrylate based nanocomposite. in Optical and Quantum Electronics
Springer., 54(6), 354.
https://doi.org/10.1007/s11082-022-03674-z

Pešić J, Šolajić A, Mitrić J, Gilić M, Pešić I, Paunović N, Romčević N. Structural and optical characterization of titanium–carbide and polymethyl methacrylate based nanocomposite. in Optical and Quantum Electronics. 2022;54(6):354.
doi:10.1007/s11082-022-03674-z .

Pešić, Jelena, Šolajić, Andrijana, Mitrić, Jelena, Gilić, Martina, Pešić, Ivan, Paunović, Novica, Romčević, Nebojša, "Structural and optical characterization of titanium–carbide and polymethyl methacrylate based nanocomposite" in Optical and Quantum Electronics, 54, no. 6 (2022):354,
https://doi.org/10.1007/s11082-022-03674-z . .