• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>International Conference on Material Science and Engineering >Synthesis and Characterization of Silica Aerogel Materials Doped with TiO_2 Powder for Thermal Insulation
【24h】

Synthesis and Characterization of Silica Aerogel Materials Doped with TiO_2 Powder for Thermal Insulation

机译：用TiO_2粉末掺杂硅气凝胶材料的合成与表征热绝缘

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Super insulation and hydrophobic silica-based aerogels doped with TiO_2 powder (8wt %) were successfully synthesized by using cost effective processing from Tetraeth oxysilane (TEOS). After aging and washing of wet gel, surface modification were modified using trimethylchlorosilane (TMCS) via one-step solvent exchange and surface modification. And the proper molar ratio of TMCS to pore water is 0.02. The microstructure and morphology of the ultralow density silica aerogels were characterized by the specific surface area, Sbet, SEM, and the pore size distribution techniques. From the results, the obtained aerogel doped with TiO_2 powder exhibited excellent physical properties with less than 10% volume shrinkage, extremely high specific surface area (652 m~2/g) and super hydrophobicity (contact angle of~145°). It should be noted that TiO_2 powders are physically embedded by SiO_2 aerogel, and there is an obvious Ti-O-Ti and Si-O-Si bonding group based on structural analysis. The thermal properties of silica aerogel were determined using the Hot Disk device, composite aerogel exhibited thermal conductivities of 0.0426 W/m-K at 700°C, TiO_2 powders effectively suppressed the intensified thermal radiations at high temperatures to achieve ultralow thermal conductivities. These results have important implications for designing novel structure of porous materials of high performance for silica aerogels.
机译：通过使用来自四氧硅烷（TEOS）的成本有效的加工成功地合成掺杂有TiO_2粉末（8wt％）的超绝缘和疏水二氧化硅的气凝胶。在湿凝胶的老化和洗涤后，通过一步溶剂交换和表面改性使用三甲基氯硅烷（TMC）来修饰表面改性。并且TMC与孔隙水的适当摩尔比为0.02。通过特定表面积，SBET，SEM和孔径分布技术的特征在于超级密度二氧化硅气凝胶的微观结构和形态。从结果中，所获得的气凝胶掺杂有TiO_2粉末的优异物理性质，体积收缩的优异物理性质，极高的比表面积（652m〜2 / g）和超级疏水性（接触角为约145°）。应注意，TiO_2粉末通过SiO_2气凝胶物理嵌入，并且基于结构分析存在明显的Ti-O-Ti和Si-O-Si键合组。使用热盘装置测定二氧化硅气凝胶的热性能，复合气凝胶在700℃下表现出0.0426W / m-K的热导体，TiO_2粉末有效地抑制了高温下的强化热辐射，以实现超级热导体。这些结果对设计硅气凝胶的高性能多孔材料的新颖结构具有重要意义。

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