Materiais compósitos obtidos a partir da interação de complexos hetero-bimetálicos em matrizes porosas e lamelares
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2014-04-23
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Universidade Federal de Goiás
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The composite materials studies have been treated in many fields of science, in order to obtain materials with improved properties compared to isolated constituents. There are several matrices, and dispersed phases, that can be used to build composite materials. From the reduced particle size materials point of view, the matrix can act restricting the particles growth. In this work, the procedure used to obtain composites was precursor metal oxamate complexes by wet impregnation followed the in situ reaction to obtain hetero bimetallic complexes within the matrix. The matrices used were the layered double hydroxides, mesoporous silica and porous Vycor glass (PVG). The composites prepared into PVG matrix was thermal decomposition to obtain de mixed oxides CuO-CeO2 and NiO-CeO2. The structural, optical, magnetic and electronic properties was studied by X ray powder diffraction, infrared spectroscopy, UV-vis spectroscopy, Raman spectroscopy, magnetic measurements and transmission electron microscopy. It was possible to observe the magnetic and electronic properties dependence due the confinement of the materials in the matrix. The molecular magnets built into LDH matrix, Mcu(opba)@HDL, where M= Co(II), Mn(II) and Ni(II), showed magnetic behavior the suggest the magnetic isolation of the materials through matrix layer. The material CoCu(opba)@SX, where X= 1, 2, 3 and 4; showed the size dependence of the chain size with the pore volume of the silica matrix. The composites CeCu@PVGX and CeNi@PVGX, where X= 2, 4, 6, 8 and 10; presented phase segregation oxides and formation of the oxides solid solution confined into PVG matrix.
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KALINKE, Lucas Hoffmann Greghi. Materiais compósitos obtidos a partir da interação de complexos hetero-bimetálicos em matrizes porosas e lamelares. 2014. 73 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Goiânia, 2014.