Voronin I. Features of chemical and adsorption modification of pyrogenic nanosilica

The study is devoted to development of scientific foundation to create new effective methods of gas-phase chemical and adsorption modification of nanoscale silica with non-volatile organic compounds. Features of chemical reactions on fumed silica surface have been considered. Results of liquid-phase adsorption modification of nanosilica with polymers are presented. A new method of modifying nanosilica has been developed, namely gas-phase solvation stimulated adsorption modification (GPSSAM). It has been shown that GPSSAM allows the creation of monolayer, submonolayer, and multilayer coatings with many high- and low-molecular organic substances: polymers, bis-quaternary ammonium compounds, polyphenols, saccharides and polyols on a nanosilica surface. It allows us to obtain a predetermined degree of coverage of a silica surface with a modifier and to preserve almost completely its initial dispersion. Preparation methods and investigations of the properties of stable aqueous suspensions of nanosilica have been described. It has been show the research results on the effectivity of application of stabilized nanosilica aqueous suspensions in pulmonology for intracavitary sorption detoxification in the medical treatment of inflammation of the chest. To develop dielectric layer fillers free of ionic contaminants, the technological scheme of modification of nanoscale oxides has been proposed with depolymerizate.