PREPARATION OF NEW SENSORS AND FILTERS OF ALDEHYDES AND / OR KETONES

摘要

The invention relates to a process for preparing a nanoporous silicate sol-gel matrix containing at least one amino reagent chosen from hydroxylamine, methylhydroxylamine, tertbutylhydroxylamine, methoxyamine, dicarboxylic acid dihydrazides, in particular dihydrazide. adipic acid, and their salts, said process comprising the following steps: a) synthesis of a gel from tetramethoxysilane or from a mixture of tetramethoxysilane and another organosilicon precursor chosen from phenyltrimethoxysilane, phenyltriethoxysilane, a fluoroalkyltrimethoxysilane, a fluoroalkyltriethoxysilane, a chloroalkylmethoxysilane, a chloroalkylethoxysilane, an aminopropyltriethoxysilane and their mixtures, the synthesis being carried out in aqueous medium at a temperature ranging from 10 to 70 ° C in the presence of at least one amino reagent chosen from hydroxylhydroxylamine, methylhydroxamine, methyl tertbutylhydroxylamine, methoxyamine, dicarboxylic acid dihydrazides , in particular adipic acid dihydrazide, and their salts; b) drying the gel obtained in step a) so as to obtain a sol-gel matrix containing at least one amine reagent.