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FABRICATION AND CHARACTERATION OF NANOPOROUS SILICA FILM

Journal of Pharmaceutical Analysis 2003年第2期15卷 152-156,161页

作者：殷明志张良莹姚熹 Electronic Materials Research Laboratory Xi'an Jiaotong UniversityXi'an 710049 China

Colloidal silica sol is formed by a novel hydrolyzing procedure of tetraethyl orthosilicate(TEOS) catalyzing with NH 3 ·H 2 O in aqueous mediums. Glycerol, combining with the hydrolyzed intermediates of TEOS, controls growing of the silica particles; poly(vinyl vinyl alcohol makes the colloidal silica sol with polymeric structure and spinning, thermal strain makes the gel silica film changed into a nanoporous structure with diameter ranging 50-150 nm. Morphologies of the nanoporous silica film have been characterized; the porosities (%) is 32-64; the average dielectric constant at 1MHz region is 2.0 and 2.1; the thermal conductivity is less than 0.8. Chemical mechanism of the sol gel process is discussed.

关键词： tetraethylorthosilicate sol gel technique nanoporous silica film thermal conductivity

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Sol-Gel Materials with Pesticide Delivery Properties

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Journal of Environmental Protection 2010年第3期1卷 302-313页

作者： Malina Raileanu Ligia Todan Maria Crisan Ana Braileanu Adriana Rusu Corina Bradu Adrian Carpov Maria Zaharescu 不详

Pesticides are widely used in agriculture, although they may create hazards both to humans and to the environment. In order to reduce the harmful effects of their administration, there has been made a great effort to find solutions. The porous sol-gel silica materials which are able to entrap different organic molecules represent new studied controlled release carriers. The aim of the present work was to prepare and characterize sol-gel composites based on trichlorfon as organophosphorous pesticide embedded in silica matrices generated from three different SiO2 sources: tetraethylorthosilicate (TEOS), colloidal silica (CS), and sodium silicate (SS). Similar samples to those containing only trichlorfon have also been synthesised, in which α-, β-, and γ-cyclodextrin have been included in order to study the possibility of improving the release of the pesticide from the silica matrices. The porous sol-gel silica materials generated from TEOS and CS are able to entrap the trichlorfon and ensure an efficient delivery of the pesticide. In the absence of cyclodextrins, better results are obtained in the case of TEOS precursor, compared to colloidal silica. The addition of cyclodextrins in order to improve the release of the pesticide from the silica matrices was successful only in the case of CS as SiO2 precursor. The best release of the pesticide was obtained with β-CD.

关键词： Sol-Gel tetraethylorthosilicate Colloidal Silica Trichlorfon Cyclodextrin

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