Silica Lamellar
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Desenvolvimento de um eletrodo quimicamente modificado baseado em materiais de sílica para a detecção de ácido fólico.
Este trabalho consiste no desenvolvimento de um Eletrodo Quimicamente Modificado (EQM) baseado em sílica para a detecção de ácido fólico (AF) e folato. Para isso foi sintetizada a sílica lamelar contendo platina metálica e o ligante 5- amino-1,3,4-tiadiazol-2-tiol. Inicialmente, realizou-se a síntese da sílica lamelar mediante reação em meio propa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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2. Novo material híbrido nanoestruturado constituído de cloreto de amoniopropil silsesquioxano e sílica
In this study it was used the sol-gel method to obtain a set of silica based hybrid material samples, containing the cationic amoniumpropyl group bonded to the matrix in a pendant way. The set of samples was characterized using X-ray diffraction, transmission electron microscopy, 29Si nuclear magnetic resonance, small angle X-ray scattering, thermogravimetri
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2009
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3. Study of alkali-silica reaction gel in concrete by high-resolution nuclear magnetic resonance / Estudo da reação álcali-sílica em concretos através de ressonância magnética nuclear de alta resolução
The alkali-silica reaction (ASR) occurs between structurally distorted or disordered silica and aqueous solutions of alkaline hydroxides, as KOH or NaOH. The product of the ASR is an alkali-silicate gel, which may expand upon water absorption. When the ASR occurs in mineral aggregate used in concrete, the process of reaction and expansion cause the decrease
Publicado em: 2009
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4. Preparation, structural and electrochemical properties of V2O5-WO3 xerogel composite / Obtenção, caracterização e estudos das propriedades de compósitos formados por xerogéis de pentóxido de vanádio e óxido de tungstênio
Vanadium pentoxide xerogel has a bi-dimensional structure which is suitable for intercalation of a variety of ions, organic compounds, and even polymeric species. In addition, when associated with other metal oxides such as WO3 and MoO3, it presents an important role in catalysis, since the resulting oxides act as promoters in catalytic reduction of the NOx
Publicado em: 2007
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5. Síntese, caracterização e atividade catalítica de novos catalisadores metaloporfirínicos suportados / Synthesis, characterization and catalytic activity of novel anchored metalloporphyrin catalysts
In this work the second generation metalloporphyrin Me(TFPP)Cl (Me = Fe and Mn) [5,10, 15, 20 ? tetrakis(pentafluorophenyl) porphyrin iron (III) or manganese (III) chloride] was covalently anchored to aminofunctionalyzed supports, through nucleophilic substituition of the para-fluorine atoms of the pentafluorophenyl meso-aryl groups, with the objective of ob
Publicado em: 2004
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6. Síntese e reatividade de sílica lamelar
An overview of the experimental procedures to prepare lamellar samples of silica, as well as the reactivity and possible applications of this kind of material is presented. Special attention is focused on the obtained materials by using neutral dialkylamine route through sol-gel process.
Química Nova. Publicado em: 2000-02
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7. Hibridos lamelares e hexagonais envolvendo silicio, aluminio, zirconio e titanio
By using tetraethylortosilicate, amorphous silica-gel, tetrabutoxyde of aluminium, zirconium and titanium, as well as n-alkyldiamnines as precursors, a series of twenty nine inorganic-organic hybrid materiais, with lamellar or hexagonal structures were synthesized. Is shown that lamellar silica samples can be sucessfully used as sequestrating agents for tran
Publicado em: 2000