PREPARATION OF TIO2/SIO2 SOLS AND USE THEREOF FOR DEPOSITION OF SELF-CLEANING ANTI- FOGGING COATINGS

摘要

The invention relates to a process for the low temperature production of TiO2/SiO2 sols and to the use thereof for the deposition of thin, optically transparent coatings having self-cleaning and anti-fogging properties. The preparation process according to the invention comprises the preparation of an acidic aqueous sol containing photochemically active TiO2 nanoparticles, the addition of a SiO2 precursor followed by hydrolysis/condensation of SiO2, the addition of amorphous TiO2 hydrolysate, the addition of colloidal SiO2, the dilution of the prepared sol with water and/or organic solvents, the deposition of the prepared sol onto the support, the evaporation of the solvent, and condensation reactions at ambient temperature, and the obtaining of a thin uniform TiO2/SiO2 layer having self-cleaning properties.