...
  • 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 >Kinetics of the SiO_2 aerogel dissolution in aqueous NaOH solutions: experiment and model
【24h】

Kinetics of the SiO_2 aerogel dissolution in aqueous NaOH solutions: experiment and model

机译：SiO_2气凝胶在NaOH水溶液中溶解的动力学：实验和模型

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

The paper is devoted to the study of the kinetics of silica aerogel dissolution in 0.05-0.79 M NaOH aqueous solutions at temperatures 15-56 deg C. The aerogel samples are prepared via common one- and two-step procedures, and differ considerably in the primary particle size. Kinetic peculiarities of the process are studied under both reaction and diffusion controlled modes and kinetic parameters are established by experimental curve fitting. The dissolution activation energy is found to be equal to 82 +- 6 kJ/mol for all the aerogels. The dissolution kinetic curves appear to be S-shaped, so that the process rate passes through a maximum. The coincidence of SAXS and BET specific surface areas indicates that the aerogels have no closed porosity so the initial rate increase cannot be explained by the opening of closed pores. A new modification of the Iler dissolution kinetic model has been developed to describe the experimentally observed kinetic curves.
机译：本文致力于研究二氧化硅气凝胶在15-56摄氏度的温度下在0.05-0.79 M NaOH水溶液中溶解的动力学。气凝胶样品是通过常规的一步和两步程序制备的，并且在初级粒径。在反应和扩散控制模式下研究了该方法的动力学特性，并通过实验曲线拟合建立了动力学参数。对于所有气凝胶，发现溶解活化能等于82±6kJ / mol。溶解动力学曲线看起来是S形的，因此处理速率达到最大值。 SAXS和BET比表面积的重合表明气凝胶没有封闭的孔隙，因此初始速率的增加无法用封闭的孔的开口来解释。已开发出对Iler溶解动力学模型的新修改，以描述实验观察到的动力学曲线。

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