کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
75283 | 49112 | 2008 | 5 صفحه PDF | دانلود رایگان |
We describe the synthesis of mesoporous silica fibers and discoids using disodium trioxosilicate (Na2SiO3 · 9H2O), a convenient silica source with cetyltrimethylmmonium chloride (CTAC) as a structure directing agent under acidic condition. The molar composition of the synthesis sol is 1Na2SiO3 · 9H2O:1.5CTAC:28HCl:729H2O. The fibers and discoids, both p6mm, hexagonal, are obtained at room temperature and 70 °C, respectively. The particles are mesoporous single-crystal like with hexagonally organized pores and possess a circular architecture with pore channels running around the fiber or discoid axis endowing self-sealed-type structure to the particles. For fibers and discoids, the BET surface areas are 1330 m2/g and 1250 m2/g, mesopore diameters are 2.4 nm and 2.5 nm, and pore volumes are 0.93 cm3 and 0.96 cm3/g, respectively.
Journal: Microporous and Mesoporous Materials - Volume 116, Issues 1–3, December 2008, Pages 581–585