TY  - JOUR
AU  - Milojkov, Dušan V
AU  - Sokić, Miroslav
AU  - Radosavljević-Mihajlović, Ana S.
AU  - Stanić, Vojislav
AU  - Manojlović, Vaso
AU  - Mutavdžić, Dragosav R
AU  - Milanović, Marija
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9922
AB  - Coupled substitution of fluorapatite (FAP) crystal lattice plays an important role in the engineering of optically active nanomaterials. Uniform fluorapatite nanopowders doped with praseodymium (Pr3+) and carbonate (CO32−) ions have been successfully synthesized by precipitation method under room temperature (25 °C). The structural, morphological, chemical and optical properties of monophase material were characterized by X-ray diffraction (XRD), Fourier Transform Infrared and Far Infrared Spectroscopy (FTIR and FIR, respectively), Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM/EDS), Transmission Electron Microscopy (TEM) and Photoluminescence Spectroscopy (PL). Coupled substitution of FAP crystal lattice with Pr3+ and CO32− reduces the crystallite size with a constant c/a ratio of 1.72. FTIR study showed that synthesized nanopowders were AB-type CO32− substitution, and FIR study revealed new Pr–O vibrations. TEM analysis was found that synthesized nanopowders were composed of irregular spheres in the nanometer range. The fluorescence of FAP nanoparticles was in the violet-blue region of the visible part of the spectrum. When Pr3+ was doped in a lattice, the violet-blue emission becomes sharper due to reabsorption. MCR–ALS analyses of fluorescence spectra indicated the shift of the maximum to the blue color with the increase in the concentration of Pr3+ ions. Additionally, luminescent nanopowders demonstrated significant antibacterial activity against Escherichia coli. As the obtained nanoparticles showed a good absorption of ultraviolet A light and reabsorption of blue-green luminescence, they are suitable for further development of optically active nanomaterials for light filtering. Optically active PrCFAP nanopowders with antibacterial properties may be promising additives for the development of multifunctional cosmetic and health care products.
T2  - Metals
T1  - Influence of Pr3+ and CO32− Ions Coupled Substitution on Structural, Optical and Antibacterial Properties of Fluorapatite Nanopowders Obtained by Precipitation
VL  - 11
IS  - 9
SP  - 1384
DO  - 10.3390/met11091384
ER  - 

@article{
author = "Milojkov, Dušan V and Sokić, Miroslav and Radosavljević-Mihajlović, Ana S. and Stanić, Vojislav and Manojlović, Vaso and Mutavdžić, Dragosav R and Milanović, Marija",
year = "2021",
abstract = "Coupled substitution of fluorapatite (FAP) crystal lattice plays an important role in the engineering of optically active nanomaterials. Uniform fluorapatite nanopowders doped with praseodymium (Pr3+) and carbonate (CO32−) ions have been successfully synthesized by precipitation method under room temperature (25 °C). The structural, morphological, chemical and optical properties of monophase material were characterized by X-ray diffraction (XRD), Fourier Transform Infrared and Far Infrared Spectroscopy (FTIR and FIR, respectively), Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM/EDS), Transmission Electron Microscopy (TEM) and Photoluminescence Spectroscopy (PL). Coupled substitution of FAP crystal lattice with Pr3+ and CO32− reduces the crystallite size with a constant c/a ratio of 1.72. FTIR study showed that synthesized nanopowders were AB-type CO32− substitution, and FIR study revealed new Pr–O vibrations. TEM analysis was found that synthesized nanopowders were composed of irregular spheres in the nanometer range. The fluorescence of FAP nanoparticles was in the violet-blue region of the visible part of the spectrum. When Pr3+ was doped in a lattice, the violet-blue emission becomes sharper due to reabsorption. MCR–ALS analyses of fluorescence spectra indicated the shift of the maximum to the blue color with the increase in the concentration of Pr3+ ions. Additionally, luminescent nanopowders demonstrated significant antibacterial activity against Escherichia coli. As the obtained nanoparticles showed a good absorption of ultraviolet A light and reabsorption of blue-green luminescence, they are suitable for further development of optically active nanomaterials for light filtering. Optically active PrCFAP nanopowders with antibacterial properties may be promising additives for the development of multifunctional cosmetic and health care products.",
journal = "Metals",
title = "Influence of Pr3+ and CO32− Ions Coupled Substitution on Structural, Optical and Antibacterial Properties of Fluorapatite Nanopowders Obtained by Precipitation",
volume = "11",
number = "9",
pages = "1384",
doi = "10.3390/met11091384"
}

Milojkov, D. V., Sokić, M., Radosavljević-Mihajlović, A. S., Stanić, V., Manojlović, V., Mutavdžić, D. R.,& Milanović, M.. (2021). Influence of Pr3+ and CO32− Ions Coupled Substitution on Structural, Optical and Antibacterial Properties of Fluorapatite Nanopowders Obtained by Precipitation. in Metals, 11(9), 1384.
https://doi.org/10.3390/met11091384

Milojkov DV, Sokić M, Radosavljević-Mihajlović AS, Stanić V, Manojlović V, Mutavdžić DR, Milanović M. Influence of Pr3+ and CO32− Ions Coupled Substitution on Structural, Optical and Antibacterial Properties of Fluorapatite Nanopowders Obtained by Precipitation. in Metals. 2021;11(9):1384.
doi:10.3390/met11091384 .

Milojkov, Dušan V, Sokić, Miroslav, Radosavljević-Mihajlović, Ana S., Stanić, Vojislav, Manojlović, Vaso, Mutavdžić, Dragosav R, Milanović, Marija, "Influence of Pr3+ and CO32− Ions Coupled Substitution on Structural, Optical and Antibacterial Properties of Fluorapatite Nanopowders Obtained by Precipitation" in Metals, 11, no. 9 (2021):1384,
https://doi.org/10.3390/met11091384 . .

TY  - JOUR
AU  - Tomić, Nataša Z.
AU  - Marinković, Aleksandar D.
AU  - Balanč, Bojana
AU  - Obradović, Vera
AU  - Pavlović, Vladimir B.
AU  - Manojlović, Vaso
AU  - Vuksanović, Marija M.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9517
AB  - Intelligent pedestrian crossings were made with the aim to increase pedestrian safety at poorly lit locations. New technologies include the design of polymer materials that have high performance by optimizing properties such as compression, tensile and impact strengths, wear resistance, hardness and transparency. The desired properties are set up to face the demands of a heavy daily traffic load and enable the functionality. Laminate material consists of the epoxy composite reinforced with silica (SiO2) derived from rice husk waste and a protective thermoplastic polyurethane layer. The top layer of the laminate material is a transparent thermoplastic polyurethane (TPU) serving as a protective layer with high wear resistance and good adhesion with epoxy composite. Silica obtained from rice husk waste was used in reinforcing of the epoxide in order to improve the mechanical properties, diffuse the light, improve the adhesion with TPU and decrease the production costs. Micro-Vickers hardness of the epoxy composite was increased by 70% with the addition of 15 wt% of SiO2. Impact energy of the epoxy composite with 15 wt% of SiO2 was increased by 272.9% after adding the TPU layer. Compressive strength of the epoxy resin is improved by 16.2% by reinforcement with 15 wt% of SiO2, while the laminate composite material showed 207% higher compressive strength than the commonly used asphalt pavement. Moreover, the addition of 15 wt% of SiO2 improved the adhesion between epoxy composite and TPU layer (11.2%). Thus, obtained laminated material made of the epoxy composite with 15 wt% of SiO2 (obtained from rice husk waste) and TPU598 showed mechanical properties and LED light transmission/diffusion appropriate for application in the intelligent pedestrian crossings. © 2021, Iran Polymer and Petrochemical Institute.
T2  - Iranian Polymer Journal (English Edition)
T1  - High-performance laminate material based on polyurethane and epoxide reinforced by silica particles from rice husk used for intelligent pedestrian crossings
VL  - 30
IS  - 3
SP  - 319
EP  - 330
DO  - 10.1007/s13726-020-00894-6
ER  - 

@article{
author = "Tomić, Nataša Z. and Marinković, Aleksandar D. and Balanč, Bojana and Obradović, Vera and Pavlović, Vladimir B. and Manojlović, Vaso and Vuksanović, Marija M.",
year = "2021",
abstract = "Intelligent pedestrian crossings were made with the aim to increase pedestrian safety at poorly lit locations. New technologies include the design of polymer materials that have high performance by optimizing properties such as compression, tensile and impact strengths, wear resistance, hardness and transparency. The desired properties are set up to face the demands of a heavy daily traffic load and enable the functionality. Laminate material consists of the epoxy composite reinforced with silica (SiO2) derived from rice husk waste and a protective thermoplastic polyurethane layer. The top layer of the laminate material is a transparent thermoplastic polyurethane (TPU) serving as a protective layer with high wear resistance and good adhesion with epoxy composite. Silica obtained from rice husk waste was used in reinforcing of the epoxide in order to improve the mechanical properties, diffuse the light, improve the adhesion with TPU and decrease the production costs. Micro-Vickers hardness of the epoxy composite was increased by 70% with the addition of 15 wt% of SiO2. Impact energy of the epoxy composite with 15 wt% of SiO2 was increased by 272.9% after adding the TPU layer. Compressive strength of the epoxy resin is improved by 16.2% by reinforcement with 15 wt% of SiO2, while the laminate composite material showed 207% higher compressive strength than the commonly used asphalt pavement. Moreover, the addition of 15 wt% of SiO2 improved the adhesion between epoxy composite and TPU layer (11.2%). Thus, obtained laminated material made of the epoxy composite with 15 wt% of SiO2 (obtained from rice husk waste) and TPU598 showed mechanical properties and LED light transmission/diffusion appropriate for application in the intelligent pedestrian crossings. © 2021, Iran Polymer and Petrochemical Institute.",
journal = "Iranian Polymer Journal (English Edition)",
title = "High-performance laminate material based on polyurethane and epoxide reinforced by silica particles from rice husk used for intelligent pedestrian crossings",
volume = "30",
number = "3",
pages = "319-330",
doi = "10.1007/s13726-020-00894-6"
}

Tomić, N. Z., Marinković, A. D., Balanč, B., Obradović, V., Pavlović, V. B., Manojlović, V.,& Vuksanović, M. M.. (2021). High-performance laminate material based on polyurethane and epoxide reinforced by silica particles from rice husk used for intelligent pedestrian crossings. in Iranian Polymer Journal (English Edition), 30(3), 319-330.
https://doi.org/10.1007/s13726-020-00894-6

Tomić NZ, Marinković AD, Balanč B, Obradović V, Pavlović VB, Manojlović V, Vuksanović MM. High-performance laminate material based on polyurethane and epoxide reinforced by silica particles from rice husk used for intelligent pedestrian crossings. in Iranian Polymer Journal (English Edition). 2021;30(3):319-330.
doi:10.1007/s13726-020-00894-6 .

Tomić, Nataša Z., Marinković, Aleksandar D., Balanč, Bojana, Obradović, Vera, Pavlović, Vladimir B., Manojlović, Vaso, Vuksanović, Marija M., "High-performance laminate material based on polyurethane and epoxide reinforced by silica particles from rice husk used for intelligent pedestrian crossings" in Iranian Polymer Journal (English Edition), 30, no. 3 (2021):319-330,
https://doi.org/10.1007/s13726-020-00894-6 . .