Aleksić, Radoslav R.

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  • Aleksić, Radoslav R. (2)
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Author's Bibliography

PMMA-Y2O3 (Eu3+) nanocomposites: optical and mechanical properties

Musbah, Salah S.; Radojević, Vesna ; Borna, Nadezda V.; Stojanović, Dušica B.; Dramićanin, Miroslav; Marinković, Aleksandar D.; Aleksić, Radoslav R.

(2011)

TY  - JOUR
AU  - Musbah, Salah S.
AU  - Radojević, Vesna 
AU  - Borna, Nadezda V.
AU  - Stojanović, Dušica B.
AU  - Dramićanin, Miroslav
AU  - Marinković, Aleksandar D.
AU  - Aleksić, Radoslav R.
PY  - 2011
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/4476
AB  - The results of a study related to the processing and characterization of poly(methyl methacrylate) (PMMA)-Y2O3 (Eu3+) nanocomposites are presented herein. The nanocomposite samples were prepared using a laboratory mixing molder with different contents of Eu-ion doped Y2O3 nanophosphor powder. The influence of particle content on the optical and dynamic mechanical properties of the nanocomposites was investigated. The intensity of the luminescence emission spectra increased as the nanophosphor content in the composite increased. The results of dynamic mechanical analysis revealed that the storage modulus, loss modulus and glass transition temperature (T-g) of the polymer composites increased with increasing content of the nanophosphor powder. The microhardness data also confirmed that the hardness number increased with nanoparticles concentration in the PMMA nanocomposites. The obtained results revealed a relatively linear relationship between T-g and the Vickers hardness.
T2  - Journal of the Serbian Chemical Society
T1  - PMMA-Y2O3 (Eu3+) nanocomposites: optical and mechanical properties
VL  - 76
IS  - 8
SP  - 1153
EP  - 1161
DO  - 10.2298/JSC100330094M
ER  - 
@article{
author = "Musbah, Salah S. and Radojević, Vesna  and Borna, Nadezda V. and Stojanović, Dušica B. and Dramićanin, Miroslav and Marinković, Aleksandar D. and Aleksić, Radoslav R.",
year = "2011",
abstract = "The results of a study related to the processing and characterization of poly(methyl methacrylate) (PMMA)-Y2O3 (Eu3+) nanocomposites are presented herein. The nanocomposite samples were prepared using a laboratory mixing molder with different contents of Eu-ion doped Y2O3 nanophosphor powder. The influence of particle content on the optical and dynamic mechanical properties of the nanocomposites was investigated. The intensity of the luminescence emission spectra increased as the nanophosphor content in the composite increased. The results of dynamic mechanical analysis revealed that the storage modulus, loss modulus and glass transition temperature (T-g) of the polymer composites increased with increasing content of the nanophosphor powder. The microhardness data also confirmed that the hardness number increased with nanoparticles concentration in the PMMA nanocomposites. The obtained results revealed a relatively linear relationship between T-g and the Vickers hardness.",
journal = "Journal of the Serbian Chemical Society",
title = "PMMA-Y2O3 (Eu3+) nanocomposites: optical and mechanical properties",
volume = "76",
number = "8",
pages = "1153-1161",
doi = "10.2298/JSC100330094M"
}
Musbah, S. S., Radojević, V., Borna, N. V., Stojanović, D. B., Dramićanin, M., Marinković, A. D.,& Aleksić, R. R.. (2011). PMMA-Y2O3 (Eu3+) nanocomposites: optical and mechanical properties. in Journal of the Serbian Chemical Society, 76(8), 1153-1161.
https://doi.org/10.2298/JSC100330094M
Musbah SS, Radojević V, Borna NV, Stojanović DB, Dramićanin M, Marinković AD, Aleksić RR. PMMA-Y2O3 (Eu3+) nanocomposites: optical and mechanical properties. in Journal of the Serbian Chemical Society. 2011;76(8):1153-1161.
doi:10.2298/JSC100330094M .
Musbah, Salah S., Radojević, Vesna , Borna, Nadezda V., Stojanović, Dušica B., Dramićanin, Miroslav, Marinković, Aleksandar D., Aleksić, Radoslav R., "PMMA-Y2O3 (Eu3+) nanocomposites: optical and mechanical properties" in Journal of the Serbian Chemical Society, 76, no. 8 (2011):1153-1161,
https://doi.org/10.2298/JSC100330094M . .
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Dispersion and deagglomeration of nano-SiO2 particles with a silane modification reagent in supercritical CO2

Stojanović, Dušica B.; Vukovic, Goran D.; Orlovic, Aleksandar M.; Uskokovic, Petar S.; Aleksić, Radoslav R.; Bibić, Nataša M.; Dramićanin, Miroslav

(2007)

TY  - JOUR
AU  - Stojanović, Dušica B.
AU  - Vukovic, Goran D.
AU  - Orlovic, Aleksandar M.
AU  - Uskokovic, Petar S.
AU  - Aleksić, Radoslav R.
AU  - Bibić, Nataša M.
AU  - Dramićanin, Miroslav
PY  - 2007
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/6743
AB  - The supercritical. CO2 method was used in order to perform deagglomeration and improve the dispersion of nano-SiO2 particles. gamma-Methacryloxypropyltrimethoxysilane was used as the surface modification reagent. The conventional method for coating nano-SiO2 particles was used as the comparison method. Considerable improvement of the dispersion and deagglomeration was found using supercritical CO2. Analysis of the TEM micrographs and DLS results showed the reduction of the average size of the agglomerates with the silane coupling reagent. Thermogravimetric analysis (TGA) showed that the particles treated in supercritical CO2 were more thermally stable than particles treated by conventional method. Encapsulation of several particles coated with the silane coupling reagent was observed in certain parts of the primary particles. A chemical reaction takes place between the modification reagent, MEMO silane, and active hydroxyl groups on the surface of the nano-SiO2 particles. A larger quantity of MEMO silane reacted using the conventional method instead of the supercritical method. On the other hand, the reacted silane molecules were better arranged around the particle surface in the supercritical. method because of the formation of covalent or self-assembled structures. Polycondensed structures were preferentially obtained in the conventional method. This was achieved by using supercritical CO2, which has a high solvating power such as organic solvents and physical properties (low viscosity, low surface tension and high diffusion coefficient) similar to gases on the other side. These properties enable the sufficient and uniform wettability of nano-SiO2 particle surfaces. These results are important for obtaining nanofillers with improved dispersion and polymer wettability. Such nanofillers can be used to obtain composite materials with considerably improved mechanical characteristics.
T2  - Hemijska industrija
T1  - Dispersion and deagglomeration of nano-SiO2 particles with a silane modification reagent in supercritical CO2
VL  - 61
IS  - 3
SP  - 109
EP  - 116
DO  - 10.2298/HEMIND0703109S
ER  - 
@article{
author = "Stojanović, Dušica B. and Vukovic, Goran D. and Orlovic, Aleksandar M. and Uskokovic, Petar S. and Aleksić, Radoslav R. and Bibić, Nataša M. and Dramićanin, Miroslav",
year = "2007",
abstract = "The supercritical. CO2 method was used in order to perform deagglomeration and improve the dispersion of nano-SiO2 particles. gamma-Methacryloxypropyltrimethoxysilane was used as the surface modification reagent. The conventional method for coating nano-SiO2 particles was used as the comparison method. Considerable improvement of the dispersion and deagglomeration was found using supercritical CO2. Analysis of the TEM micrographs and DLS results showed the reduction of the average size of the agglomerates with the silane coupling reagent. Thermogravimetric analysis (TGA) showed that the particles treated in supercritical CO2 were more thermally stable than particles treated by conventional method. Encapsulation of several particles coated with the silane coupling reagent was observed in certain parts of the primary particles. A chemical reaction takes place between the modification reagent, MEMO silane, and active hydroxyl groups on the surface of the nano-SiO2 particles. A larger quantity of MEMO silane reacted using the conventional method instead of the supercritical method. On the other hand, the reacted silane molecules were better arranged around the particle surface in the supercritical. method because of the formation of covalent or self-assembled structures. Polycondensed structures were preferentially obtained in the conventional method. This was achieved by using supercritical CO2, which has a high solvating power such as organic solvents and physical properties (low viscosity, low surface tension and high diffusion coefficient) similar to gases on the other side. These properties enable the sufficient and uniform wettability of nano-SiO2 particle surfaces. These results are important for obtaining nanofillers with improved dispersion and polymer wettability. Such nanofillers can be used to obtain composite materials with considerably improved mechanical characteristics.",
journal = "Hemijska industrija",
title = "Dispersion and deagglomeration of nano-SiO2 particles with a silane modification reagent in supercritical CO2",
volume = "61",
number = "3",
pages = "109-116",
doi = "10.2298/HEMIND0703109S"
}
Stojanović, D. B., Vukovic, G. D., Orlovic, A. M., Uskokovic, P. S., Aleksić, R. R., Bibić, N. M.,& Dramićanin, M.. (2007). Dispersion and deagglomeration of nano-SiO2 particles with a silane modification reagent in supercritical CO2. in Hemijska industrija, 61(3), 109-116.
https://doi.org/10.2298/HEMIND0703109S
Stojanović DB, Vukovic GD, Orlovic AM, Uskokovic PS, Aleksić RR, Bibić NM, Dramićanin M. Dispersion and deagglomeration of nano-SiO2 particles with a silane modification reagent in supercritical CO2. in Hemijska industrija. 2007;61(3):109-116.
doi:10.2298/HEMIND0703109S .
Stojanović, Dušica B., Vukovic, Goran D., Orlovic, Aleksandar M., Uskokovic, Petar S., Aleksić, Radoslav R., Bibić, Nataša M., Dramićanin, Miroslav, "Dispersion and deagglomeration of nano-SiO2 particles with a silane modification reagent in supercritical CO2" in Hemijska industrija, 61, no. 3 (2007):109-116,
https://doi.org/10.2298/HEMIND0703109S . .
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