HYBRID GELS AS HOST MATRICES OF PERFUMED ESSENCES

The variety of SiO2-gel structures allows the use of sol-gel derived m aterials as host matrices for prolonged release of chemicals. In this work, the release of perfumed essences is studied in the case of hybri d SiO2 materials obtained from alkyl-modified silicon alkoxides. Therm ogravimetric analysis in isothermal conditions at various temperatures provide data on the kinetic release process. The effects of physical parameters (porosity reduction, vapour pressure) and chemical interact ions (organic molecules with matrix) are discussed for the interpretat ion of the results.