title: Preparation of hexagonal platy particles of nanoporous silica using hydrotalcite as morphology template.
abstract: Hexagonal platy composite particles with a hydrotalcite core and a nanoporous silica shell with a thickness of ca. 100 nm were synthesized by the reaction of a Mg-Al hydrotalcite with a homogeneous aqueous solution containing tetraethoxysilane, hexadecyltrimethylammonium chloride, ammonia and methanol at 3 degrees C. The calcination of the products at 500 degrees C in air led to the composite particle with a Mg/Al mixed oxide core and a nanoporous silica shell. Hexagonal platy particles of nanoporous silica with a pore diameter of 2.3 nm and BET surface area of 700 m(2) (g of silica)(-1) were obtained by removing the Mg/Al mixed oxide core.
authors.affiliation: Graduate School of Science and Engineering, Waseda University, Nishiwaseda 1-6-1, Tokyo 169-8050, Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Shimura
authors.forename: Makoto
authors.initials: M
authors.lastname: Ogawa