...
  • 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 >Effect of leaching concentration and time on the morphology of pores in porous glasses
【24h】

Effect of leaching concentration and time on the morphology of pores in porous glasses

机译：浸出浓度和时间对多孔玻璃中气孔形态的影响

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

Herein, porous glass was prepared by the acid leaching of phase-separated sodium borosilicate glass. The effects of hydrochloric acid (HCl) leaching concentrations varying from 0.1 to 3 M and of leaching times varying from 2 to 48 h on pore size and shape are reported here. The porous structure evolution was investigated through small angle X-rays scattering measurements and were compared to the classical nitrogen adsorption technique. We argue that the composition of these samples is not significantly modified with the acidic concentrations of the solution or with the leaching times tested. However, as expected a priori, we clearly show strong differences in porous structure. The investigation of different HCl leaching concentrations (from 0.1 to 3 M), with a small variation between each concentration, has enabled the observation of an interesting result. That is, we clearly show a non-linear effect of acidic concentration on the porous structure of these materials. At low acid concentrations, the specific area of these materials is relatively low. Increasing the HCl concentration to approximately 0.7 M leads to a strong increase in a specific BET area and total pore volume. However, further increasing of the acid concentration of the leaching solution leads to a decrease of both the specific surface area and the total pore volume. All of these results due to the presence of colloidal silica inside the pore structure can be explained by the well-known Zhdanov's model. These nanoparticles formed at an intermediate acid concentration seem to cluster when the acidity increases. The effect of the leaching time is less significant than the HCl concentration; however, this same assumption can be explained by the experimental results.
机译：在此，通过相分离的硼硅酸钠玻璃的酸浸制备多孔玻璃。此处报道了盐酸（HCl）浸出浓度从0.1到3 M不等，浸出时间从2到48 h不等对孔径和形状的影响。通过小角度X射线散射测量研究了多孔结构的演变，并将其与经典的氮吸附技术进行了比较。我们认为这些样品的组成不会随着溶液的酸性浓度或测试的浸出时间而显着改变。但是，正如先验所料，我们清楚地表明了多孔结构的巨大差异。对不同的HCl浸出浓度（0.1至3 M）进行研究，每个浓度之间的变化很小，从而观察到了有趣的结果。也就是说，我们清楚地表明了酸性浓度对这些材料的多孔结构的非线性影响。在低酸浓度下，这些材料的比表面积相对较低。将HCl浓度增加到大约0.7 M会导致比表面积和总孔体积的大幅增加。然而，进一步增加浸出溶液的酸浓度导致比表面积和总孔体积的减少。由于孔结构内部存在胶体二氧化硅，所有这些结果都可以用众所周知的Zhdanov模型来解释。当酸度增加时，在中等酸浓度下形成的这些纳米颗粒似乎聚集。浸出时间的影响不如HCl浓度显着。但是，相同的假设可以通过实验结果来解释。

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