Therefore, it can meet the modern new material, new technology, and the needs of the development of new technology. People can use physical, chemical, and mechanical methods to deal with the fumed silica surface or interface, in order to change its chemical and physical properties of the fumed silica surface, such as surface energy, surface wettability, electrical, adsorption, and reaction characteristics, surface structure and functional groups, etc. It is widely used in various industries as additives, catalyst carriers, petrochemical, decolorizing agent, matting agent, rubber reinforcing agent, plastic filling agents, ink thickening agents, metal soft polishing agents, insulation and adiabatic filler, advanced daily cosmetic filler, and spraying materials, medicine, environmental protection, and other fields.įumed silica mainly has two "sex”: hydrophilic and hydrophobic. In addition, its high stability, its reinforcing effect, thickening, and thixotropy, in many fields of unique characteristics make it irreplaceable. It has a small particle size, large specific surface area, strong surface adsorption, large surface energy, high chemical purity, good dispersion performance, thermal resistance, resistance, and other aspects of specific performance. This three-dimensional network structure (hydrogen bond) with external force (shear force, electric force, etc.) will be destroyed, the medium becomes thin, the viscosity drops, and once the external force disappears, the three-dimensional structure (hydrogen bond) will restore itself, the viscosity rises, that is, this thixotropy is reversible.įumed silica is one of the most important new inorganic materials. The vapor phase silica aggregates with the untreated surface are aggregates containing multiple -Oh compounds, which can easily form a uniform three-dimensional network structure (hydrogen bond) in the liquid system. One is an isolated, undisturbed free hydroxyl group The other is bonded silyl groups that are linked and form hydrogen bonds to each other. The vapor phase silica aggregates with untreated surfaces contain a variety of silica hydroxyl groups. It is a kind of amorphous silicon dioxide product, the primary particle size is between 7~40nm, the aggregate particle size is about 200-500 nm, the specific surface area is 100~400m2/g, high purity, and SiO2 content is not less than 99.8%. In hair conditioners, hydrophilic AEROSIL® types such as AEROSIL® 200 and AEROSIL® 300, can help increase the volume of the hair, counteracting the “flattening” effect of the conditioning agents.Fumed silica is a nanometer white powder produced by the hydrolysis of silicon halide at high temperature in an oxyhydrogen flame. It is particularly effective as a drying agent in a concentration of up to 4.0 percent w/w. In hair dyes, AEROSIL® fumed silica prevents a premature reaction and caking of powdered colorant components. This fumed silica can also be used as a thickening and stabilizing agents in bleaching creams. This results in improved free-flow properties even after extended storage. AEROSIL® fumed silica effectively prevents moistening and caking of the peroxo and persulfate salts usually used in bleaching powders. AEROSIL® 200 is a hydrophilic fumed silica with a specific surface area of 200 m2/g.
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