...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >The effect of acidity on the structural and textural evolution of titania in the presence of primary amine and inorganic precursor
【24h】

The effect of acidity on the structural and textural evolution of titania in the presence of primary amine and inorganic precursor

机译：伯胺和无机前体存在下酸度对二氧化钛结构和织构演变的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Titania was synthesized from laurylamine hydrochloride (LAHC) and Ti(SO4)2 under different acidic conditions. The effect of acidity on the structural and textural evolution of titania has been investigated by X-ray diffraction (XRD), nitrogen adsorption-desorption, transmission electron micrographs (TEM), FTIR spectroscopy and thermogravimetric analysis (TGA). With increasing the pH value in the initial mixture, the obtained samples transformed from nanoparticles with intra-particle mesostructures (pH 0.6 and 2.0) to nanoparticles with nonporous structure (pH 3.7), and finally to worm-like porous materials with inter-particle mesostructures (pH 4.2) resulted from the aggregates of nanoparticles. The obtained mesoporous nanoparticles (pH 0.6 and 2.0) have mean diameter of ca. 25 run, and the pore size distributions are bimodal with fine intra-particle pores and larger inter-particle pores. The intra-particle mesostructure not only retard the growth of nanocrystallites, but also prevent phase transition of anatase to rutile at high temperature. The BET surface area of the TiO2 calcined at 300 degrees C decreased from 212 to 74 m(2)/g with pH increasing from 0.6 to 4.2. (c) 2006 Elsevier B.V. All rights reserved.
机译：二氧化钛是由月桂胺盐酸盐（LAHC）和Ti（SO4）2在不同的酸性条件下合成的。通过X射线衍射（XRD），氮吸附-脱附，透射电子显微照片（TEM），FTIR光谱和热重分析（TGA）研究了酸度对二氧化钛结构和组织演变的影响。随着初始混合物中pH值的增加，获得的样品将从具有颗粒内介孔结构（pH 0.6和2.0）的纳米颗粒转变为具有无孔结构（pH 3.7）的纳米颗粒，最后转变为具有颗粒间介孔结构的蠕虫状多孔材料（pH 4.2）是由纳米颗粒的聚集体产生的。所获得的中孔纳米粒子（pH 0.6和2.0）的平均直径约为。 25nm，并且孔径分布是双峰的，具有细的颗粒内孔和较大的颗粒间孔。颗粒内的介观结构不仅阻止了纳米微晶的生长，而且还阻止了锐钛矿在高温下向金红石的相变。在300摄氏度下煅烧的TiO2的BET表面积从212降至74 m（2）/ g，pH从0.6升高至4.2。 （c）2006 Elsevier B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号