Aerogels
Mostrando 1-5 de 5 artigos, teses e dissertações.
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1. The novel mesoporous silica aerogel modified with protic ionic liquid for lipase immobilization
Mesoporous silica supports (aerogels) were used to immobilize Burkholderia cepacia lipase (BC) by encapsulation (EN or ENIL), physical adsorption (ADS or ADSIL) and covalent binding (CB or CBIL) into or onto the aerogel modified with protic ionic liquid (PIL). Yield immobilization (Ya) and operational stability were determined by the hydrolytic reaction of o
Quím. Nova. Publicado em: 2016-05
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2. INFLUÊNCIA DO CATALISADOR EM SOLUÇÕES POLIMÉRICAS PARA O PREPARO DE GÉIS ORGÂNICOS DE RESORCINOL-FORMALDEÍDO
Resorcinol-formaldehyde (RF) organic gels have been extensively used to produce carbon aerogels. The organic gel synthesis parameters greatly affect the structure of the resulting aerogel. In this study, the influence of the catalyst quantity on the polymeric solution sol-gel process was investigated. Sodium carbonate was used as a basic catalyst. RF gels we
Quím. Nova. Publicado em: 2015-11
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3. Aerogel de Sílica: caracterização estrutural e estudo da propriedade da água adsorvida na superfície. / Silica Aerogels: structural characterization and property study of adsorbed water on the surface.
The synthesis of glasses using the sol-gel method appeared recently of great interest either from the technological or from the scientific point of view. We describe the process used to obtain pure vitreous silica (gel formation → hypercritical drying → densification) as well as some physical and chemical characteristics of the various products fab
Publicado em: 1992
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4. Sois, geis e vidros de sílica obtidos pelo processo sol-gel / Sílica Sols, gels and glasses made by sol-gel process
Estudos sistemáticos utilizando a técnica de SAXS foram realizados no síncrotom do LURE (Orsay) com feixe intenso de geometria pontua:, para descrever a cinética e as estruturas obtidas durante as etapas de transformação sol ->gel úmido ->gel seco ->vidros de sílica . As análises foram feitas em termos de uma lei de potência I = q-? cujo expoente e
Publicado em: 1987
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5. Visualization of gas flow and diffusion in porous media
The transport of gases in porous materials is a crucial component of many important processes in science and technology. In the present work, we demonstrate how magnetic resonance microscopy with continuous flow laser-polarized noble gases makes it possible to “light up” and thereby visualize, with unprecedented sensitivity and resolution, the dynam
The National Academy of Sciences.