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SM ISO690:2012 KOBYLINSKA, Natalia, MELNYK, Inna, DUDARKO, Oksana. Development of effective luminiscent materials based on functionalized mesoporous organosilica. In: Achievements and perspectives of modern chemistry, 9-11 octombrie 2019, Chişinău. Chisinau, Republic of Moldova: Tipografia Academiei de Ştiinţe a Moldovei, 2019, p. 98. ISBN 978-9975-62-428-2. |
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Achievements and perspectives of modern chemistry 2019 | |||||
Conferința "International Conference "Achievements and perspectives of modern chemistry"" Chişinău, Moldova, 9-11 octombrie 2019 | |||||
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Pag. 98-98 | |||||
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Nanoluminophores based on rare-earth elements (REEs) show important benefits over other available luminescent materials involving lighting, lasers, and detectors of many forms of radiation with high quantum yield [1]. In general, interest is not only optical but also catalytic, magnetic and adsorption applications of the REEs based materials. Hybrid organo-inorganic materials with covalent immobilized functional groups have several advantages over noncovalently bound systems: greater thermal, photochemical and chemical stability, homogeneity of structure and non-evaporation of components. We proposed ordered phenyl/thiolpropyl functionalized mesoporous silica (SBA-15) with Ce-containing complexes as effective luminescent materials. The hybrid materials were synthesized by the template procedure with grafting functionalization.The activation of the surface layer for interaction with REEs ions was carried out by sulfonation.X-ray diffraction, infrared spectroscopy, scanning and transmission electron microscopy and nitrogen adsorption-desorption method, potentiometric and thermogravimetric analyses, were used for characterization of obtained materials. The concentration Ce(III) ions in solution was determined using ICP-OES technique. The luminescence properties of obtained materials were studied in solid stateby excitation (Ce4f Ce5d bands) and emission (Ce5d Ce4f bands) spectra. This work is also targeted towards understanding the affinity of ordered functionalized mesoporous silica to Ce(III) in relation to complexation mechanism. The high surface concentration of the functional groups affords potential sites that are essential for the formation of the REEs complexes. |
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