1995 Volume 68 Issue 9 Pages 542-550
Inorganic silica capsule with cavity was prepared by utilizing a non-aqueous gelling agent derived from amino acid and tetraethoxysilane (TEOS). The non-aqueous gelling agent used was N-lauroyl-L-gultamic acid-α, γ-di-n-butylamide (LGBA). When ammonia water (pH = 13. 2) was added dropwise to the solution composed of LGBA, TEOS, n-decane (oil), and alco-hol having alkyl chain less than two, the hollow gel with TEOS trapped in its structure was formed at the interface between the solution and water. A heat treatment of this TEOS-trapped gel resulted in the formation of the silica porous capsule with cavity.