PREPARATION OF TiO2/SiO2 SOLS AND THEIR USE FOR APPLICATION OF SELF-CLEANING AND ANTI-FOGGING COATINGS

摘要

The subject of the invention relates to a procedure of low temperature preparation of TiO2/SiO2 sols and their use for application of thin optically transmissive coatings with self-cleaning and anti-fogging properties. The preparation according to the invention is characterised in that the procedure consists of preparation of an acidic water sol containing photochemically active TiO2 nanoparticles, addition of SiO2 precursor followed by the hydrolysis/condensation of SiO2 and organically modified SiO2, addition of amorphous TiO2 hydrolysate, addition of colloidal SiO2, dilution of the prepared sol with water and/or organic solvents, application of the prepared sol to the substrate, evaporation of solvent and, in case of condensation reactions at the room temperature, formation of a thin and uniform TiO2/SiO2 layer with self-cleaning properties.