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FABRICATION AND CHARACTERATION OF NANOPOROUS SILICA FILM

FABRICATION AND CHARACTERATION OF NANOPOROUS SILICA FILM
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摘要 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. 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.
出处 《Journal of Pharmaceutical Analysis》 SCIE CAS 2003年第2期152-156,161,共6页 药物分析学报(英文版)
基金 ThisworkwassupportedbytheNational973ProjectofChina(No.2002CB613305).ElectronicmaterialinstituteofXianJiaotongUniversity.
关键词 TETRAETHYLORTHOSILICATE sol gel technique nanoporous silica film thermal conductivity tetraethylorthosilicate sol gel technique nanoporous silica film thermal conductivity
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