Fumed silica has use thickener
Properties
Fumed silica has a very strong thickening effect. Primary particle size is 5–50 nm. The particles are non-porous and have a surface area of 50–600 m2/g. The density is 160–190 kg/m3.Applications
Fumed silica serves as a universal thickening agent and an anticaking agent (free-flow agent) in powders.  Like silica gel, it serves as a desiccant.  It is used in cosmetics for its light-diffusing properties. It is used as a light abrasive, in products like toothpaste. Other uses include filler in silicone elastomer and viscosity adjustment in paints, coatings, printing inks, adhesives and unsaturated polyester resins.