In addition, fumed silica is amorphous with high purity (SiO
Two
%Moreover, due to the existence of the surface active silicon hydroxyl group and the low packing density and good fluidity of fumed silica, it is possible to realize the dry surface modification of fumed silica without destroying the special structure of fumed silica. The surface modification can be obtained by selecting different structure and function of the surface modifier Different functional products can realize the functionalization of fumed silica. Because of its unique structure and performance, fumed silica has excellent functions of reinforcement, thickening, thixotropy, anti sinking, anti sagging, adsorption and heat insulation in practical application. It has been widely used in dozens of fields, such as rubber, plastics, coating, adhesive, industrial catalysis, food, medicine, CMP, heat insulation and heat preservation materials, making fumed silica widely used It has become the "white rich beauty" in silicon dioxide and the "Darling" of the market.