US Patent 7879350 - Reducing odor with silica nanoparticles

http://www.freepatentsonline.com/7879350.html

This patent is from Kimberly-Clark Worldwide and teaches using porous substrates with silica nanoparticles as odor reducing agents for articles such as clothing, diapers and bandages. Claim 1 reads:

1. A substrate for reducing odor, said substrate being porous and comprising a nonwoven, woven, or paper web, said substrate containing colloidal silica nanoparticles configured to adsorb one or more odorous compounds, said silica nanoparticles having an average size of from about 1 to about 50 nanometers and a surface area of from about 50 to about 1000 square meters per gram, wherein the silica nanoparticles are relatively nonporous and thus have a pore volume of less than about 0.4 milliliters per gram.