Preparation of hexagonal platy particles of nanoporous silica using hydrotalcite as morphology template |
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Authors: | Shimura Naoki Ogawa Makoto |
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Institution: | Graduate School of Science and Engineering, Waseda University, Nishiwaseda 1-6-1, Tokyo 169-8050, Japan. |
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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. |
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