کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
612479 | 880699 | 2007 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Preparation of hexagonal platy particles of nanoporous silica using hydrotalcite as morphology template Preparation of hexagonal platy particles of nanoporous silica using hydrotalcite as morphology template](/preview/png/612479.png)
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 °C. The calcination of the products at 500 °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 m2 (g of silica)−1 were obtained by removing the Mg/Al mixed oxide core.
Hexadecyltrimethylammonium cation–silica layers were deposited on a Mg–Al hydrotalcite. A nanoporous silica–Mg/Al oxide composite was obtained by calcination. Nanoporous silica hollow platy particles, which replicated the morphology of hydrotalcite, were obtained by dissolution of the hydrotalcite core.Figure optionsDownload as PowerPoint slide
Journal: Journal of Colloid and Interface Science - Volume 312, Issue 2, 15 August 2007, Pages 311–316