标题：Fabrication of silica monoliths with hierarchically porous structure from freeze-drying
作者：Lu, Lu ;Wei, Yu Lei ;Lin, Jie ;Qian, Lei
作者机构：[Lu, Lu ;Wei, Yu Lei ;Lin, Jie ;Qian, Lei ] Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), 更多
会议名称：Chinese Materials Congress, CMC 2014
会议日期：4 July 2014 through 7 July 2014
来源：Materials Science Forum
关键词：Freeze-drying; Hierarchical structure; Impregnation; Porous silica
摘要：This paper provides a novel route to prepare silica monoliths with hierarchical porous structure via freeze drying. In this method, macroporous silica monoliths were first produced by freeze-drying and calcination. By adjusting the concentration of cetyltrimethylammonium bromide in ethylsilicate, a layer of mesoporous thin film was attached on the macroporous silica monolith. The structural characterization of the hierarchical porous monoliths were studied by field emission scanning electron microscopy, mercury porosimeter and nitrogen adsorption-desorption techniques (BET). It turned out that the pore distribution of the obtained monoliths was ranged from 3.72 nm to 23.21nm and the maximum specific surface area calculated from BET was about 288 m2/g, which indicated the existence of hierarchical structure in the obtained material. © (2015) Trans Tech Publications, Switzerland.