STRUCTURE AND PROPERTIES OF HYDROSOLS, GELS, AND XEROGELS OF TITANIUM-DIOXIDE PREPARED FROM TITANIUM METHYL CELLOSOLVATE

A method for the synthesis of stable hydrosols of titanium dioxide fro m titanium methyl cellosolvate was developed that excludes the peptiza tion stage. The interaction of the obtained sols with electrolytes and the sizes and electrophoretic mobility of particles were investigated . A method was proposed to increase the sol coagulation threshold by t he addition of acid. It was discovered that, when concentrating sols i n the air, gelation occurs at relatively low concentrations, the gelat ion concentration lowering with the content of acid. The gels, xerogel s, and precipitate of titanium dioxide obtained in the course of hydro lysis of titanium methyl cellosolvate under different conditions were studied by X-ray diffraction analysis. It was established that the exa mined sols and gels usually contain anatase nanocrystallites and weakl y charged polymer particles; in the course of the gel-xerogel transiti on, the latter are also crystallized with the formation of anatase nan oparticles.