Wednesday, April 20, 2011

US Patent 7927570 - Silicon nanopowder

BET theory is used to explain the adsorption of gas molecules on solid surfaces and can be used in the measurement of the specific surface area of a material.  This patent from Evonik Degussa GmbH discloses a process to form silicon nanopowder with high BET surface area useful to electronics applications. Claim 1 reads:

1. An aggregated crystalline silicon powder, comprising lithium as a doping component; wherein a proportion of lithium is up to 53 wt. %, and a BET surface area of the aggregated crystalline silicon powder is from 20 to 150 m2/g.