4.6 Article

Synthesis and micro structural investigations of titania-silica nano composite aerogels

期刊

MATERIALS CHEMISTRY AND PHYSICS
卷 135, 期 2-3, 页码 497-502

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2012.05.014

关键词

Composite materials; Nanostructures; Sol-gel growth; Small angle scattering

向作者/读者索取更多资源

We have synthesized titania-silica (TiO2-SiO2) aerogel composites with 20 wt%, 50 wt% and 65 wt% TiO2 by sol-gel method and investigated their microstructure in detailed using variety of techniques. X-ray diffraction showed formation of the anatase phase of TiO2 in nano-crystalline form which was confirmed by the broadening of Raman spectra. FTIR studies indicated that TiO2 is structurally incorporated in to the lattice of silica with formation of the Si-O-Ti linkage. Small angle X-ray scattering study indicated the presence of larger aggregates with rough surfaces. A systematic variation in the morphology of the larger grains and constituting smaller particles (of typical size about 20 nm) with increase in TiO2 content has been noticed. Pictures from TEM indicated that TiO2 is confined to the pores in the host silica gel, resulting in formation of TiO2 nano-crystallites leading to high surface area. Nitrogen-physisorption studies further confirmed that the TiO2 particles occupy the pores of gel matrix resulting in reduction in the average pore diameter with increasing TiO2 content. The results from all the techniques clearly suggested that the variations in the microstructure of the composites as prepared by sol-gel method will have significant impact on the optical and catalytic performance of the TiO2. (C) 2012 Elsevier B.V. All rights reserved.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据