• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Crystal growth & design >Morphology-Controlled Synthesis of Cubic Cesium Hydrogen Silicododecatungstate Crystals
【24h】

Morphology-Controlled Synthesis of Cubic Cesium Hydrogen Silicododecatungstate Crystals

机译：形态学控制的立方铯氢硅十二碳酸盐晶体的合成

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

Cubic particles of cesium hydrogen silicododecatungstate crystals are obtained for the first time by the use of spherical seed crystals and control of the Cs+ to SiW12O404- (Cs/POM) ratio in the synthetic solution. The morphology of the particles is controlled between rhombic dodecahedra faceted with {110} planes (thermodynamically stable morphology) and cubes faceted with {100} planes. Scanning transmission electron microscopy-energy-dispersive X-ray spectroscopy analysis of the cross-section shows that the cubes possess a core-shell structure, and the Cs/POM ratio of the shell (ave. 3.24) is larger than that of the core (ave. 2.76), suggesting the existence of anion (POM) vacancies in the shell. Solid state magic angle spinning NMR spectroscopy, nitrogen adsorption, and water vapor sorption measurements of the cubes show that the porous core is covered by the dense shell, and only water molecules can diffuse through the dense shell via the anion vacancies. Despite the small amounts of acidic protons, the cubes exhibit moderate proton conductivity (2.5 x 10(-4) S cm(-1)) at room temperature under water vapor (298 K, P/P-0 = 0.95), suggesting that mobile water molecules in the anion vacancies contribute to the proton conduction.
机译：通过使用球形晶种并控制合成溶液中Cs +与SiW12O404-（Cs / POM）的比率，首次获得了立方晶的氢硅化十二烷基铯酸铯晶体。颗粒的形态在带有{110}平面的菱形十二面体（热力学稳定形态）和带有{100}平面的立方体之间进行控制。截面的扫描透射电子显微镜-能量色散X射线光谱分析表明，立方体具有核-壳结构，壳的Cs / POM比（3.24）大于核。 （第2.76版），表明壳中存在阴离子（POM）空位。多维数据集的固态魔角旋转NMR光谱，氮吸附和水蒸气吸附测量表明，多孔核被致密壳覆盖，只有水分子可以通过阴离子空位扩散通过致密壳。尽管有少量酸性质子，但在水蒸气（298 K，P / P-0 = 0.95）的室温下，立方体仍显示出适中的质子传导性（2.5 x 10（-4）S cm（-1））。阴离子空位中的流动水分子有助于质子传导。

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