TITANIUM OXIDE SOL, THIN FILM, AND PROCESSES FOR PRODUCING THESE

摘要

A titanium oxide sol containing chlorine ions and at least one Bronsted base other than chlorine ions, preferably selected among nitrate ions and phosphate ions. The titanium oxide contained in the sol preferably consists mainly of brucite type titanium oxide. This sol is produced by hydrolyzing titanium tetrachloride in the presence of at least one Bronsted acid. A thin titanium oxide film formed from this titanium oxide sol is excellent in photocatalytic activity, transparency, adhesion to substrates, etc.