Functional Materials, 2015, № 2
http://dspace.nbuv.gov.ua:80/handle/123456789/114728
2024-03-29T00:37:09ZRadiation-hard plastic scintillator with increased mechanical strength
http://dspace.nbuv.gov.ua:80/handle/123456789/119368
Radiation-hard plastic scintillator with increased mechanical strength
Zhmurin, P.N.; Lebedev, V.N.; Bedrik, A.I.; Titskaya, V.D.; Adadurov, A.F.; Velmozhnaya, E.
This paper describes possibilities of improving mechanical properties of radiation-hard plastic scintillator (PS) with additives by spatial cross-linking their polymer base. This allows improving the mechanical properties of the PS preserving their light yield and transparency. The cross-linked structure is formed in the PS matrix by copolymerization of the main monomer and cross-linking monomer which contains two active vinyl groups. 4,4'-Bis-(methylene-2-metacrylate)-biphenyl (BPBMA) was used as the cross-linking agent and derivatives of biphenyl and naphthalene as diffuse enhancers. Inserting the cross-linking agent and diffuse enhancers facilitate the increase of the PS mechanical strength retaining its functional properties.
2015-01-01T00:00:00ZMixed-ligand complexes of gadolinium carboxylates containing unsaturated bonds in plastic scintillators
http://dspace.nbuv.gov.ua:80/handle/123456789/119367
Mixed-ligand complexes of gadolinium carboxylates containing unsaturated bonds in plastic scintillators
Velmozhnaya, E.S.; Bedrik, A.I.; Zhmurin, P.N.; Safronov, D.S.; Doroshenko, A.G.
Results are presented on properties of new synthesized Gd-carboxylates with unsaturated bonds. Gd-containing polystyrene oligomer and plastic scintillators based thereon were obtained using these compounds. The chemical structure of the synthesized compounds was characterized by the IR spectroscopy. Thermographic properties of new complexes were investigated. It is shown that thermal stability of the gadolinium complexes significantly increases with introduction of the unsaturated moiety into their structure and reaches at about 300 °C. The solubility of these structures remains practically unchanged with respect to complexes that do not contain unsaturated bonds. The light output of the obtained Gd-loaded material (plastic scintillators) is kept sufficiently high and reaches 78 % with respect to the unloaded sample.
2015-01-01T00:00:00ZInteraction in self-flux of systems MI₂O-P₂O₅-TiO₂-MIIO (MI - Rb, Rb/K, MII - Cu, Zn)
http://dspace.nbuv.gov.ua:80/handle/123456789/119366
Interaction in self-flux of systems MI₂O-P₂O₅-TiO₂-MIIO (MI - Rb, Rb/K, MII - Cu, Zn)
Strutynska, N.Yu.; Bondarenko, M.A.; Zatovsky, I.V.; Babaryk, A.A.; Slobodyanyk, N.S.
Peculiarities of phase formation in the self-flux of systems MI₂O-P₂O₅-TiO₂-MIIO (MI - Rb, Rb/K, MII - Cu, Zn) were investigated at different molar ratios MI/P = 0.5-1.3 and fixed values Ti/P = 0.3, Ti/MII = 1.0 in the temperature range of 1000-650 °C. Influence of the nature of alkali metal on interaction in multicomponent phosphate melts at molar ratios (Rb+K)/P = 1.0, Ti/P = 0.3, Ti/MII = 1.0 was found. Thus, the presence of potassium in the melts promotes the formation of langbeinite-related complex phosphates at the investigated ratios of components. The obtained phosphates were investigated by X-ray powder diffraction, infrared spectroscopy and optical microscopy.
2015-01-01T00:00:00ZObtaining of strontium doped fluorapatite powders
http://dspace.nbuv.gov.ua:80/handle/123456789/119361
Obtaining of strontium doped fluorapatite powders
Sayenko, S.Yu.
Possibility of obtaining powders of calcium Ca₁₀(PO₄)₆F₂ and strontium-containing Ca₉Sr(PO₄)₆F₂ fluorapatites by both solid phase reaction method with subsequent heat treatment and chemical co-precipitation method from solutions of the initial components was investigated. It was shown that the total synthesis of calcium Ca₁₀(PO₄)₆F₂ and strontium-containing Ca₉Sr(PO₄)₆F₂ fluorapatites by solid phase method occurs at a temperature of 900 °C, and by chemical co-precipitation as a result of the reaction between initial components. Obtained nanosized powders of calcium and strontium-containing fluorapatites were produced by chemical co-precipitation method.
2015-01-01T00:00:00Z