...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ACS applied materials & interfaces >Characterization of the Mobility and Reactivity of Water Molecules on TiO2 Nanoparticles by ~1H Solid-State Nuclear Magnetic Resonance
【24h】

Characterization of the Mobility and Reactivity of Water Molecules on TiO2 Nanoparticles by ~1H Solid-State Nuclear Magnetic Resonance

机译：〜1H固态核磁共振表征TiO2纳米颗粒上水分子的迁移率和反应性

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

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

摘要

Understanding interfacial water behavior is essential to improving our understanding of the surface chemistry and interfacial properties of nanomaterials. Here using ~1H solid-state nuclear magnetic resonance (~1H SSNMR), we successfully monitored ligand exchange reaction between oleylamine (OLA) and adsorbed water on titanium dioxide narioparticles (TiO2 NPs). Three different types of interfacial waters with different reactivities were distinguished. The mobility of the adsorbed water molecules was characterized by dipolar filtered ~1H SSNMR. Our experimental results demonstrate that the adsorbed water can be categorized into three different layers: (i) rigid water species with restricted mobility closest to the surface of TiO2 NPs, (ii) less mobile water species weakly confined on TiO2 NPs, and (iii) water molecules with high mobility. Water in the third layer could be replaced by OLA, while water in the first and second layers remained intact. The finding that the interfacial water with the highest mobility has the strongest reactivity has guiding significance for tailoring the hydrophilic and hydrophobic properties of TiO2 NPs.
机译：了解界面水行为对于增进我们对纳米材料的表面化学和界面特性的理解至关重要。在这里，使用〜1H固态核磁共振（〜1H SSNMR），我们成功地监测了油胺（OLA）与二氧化钛纳米粒子（TiO2 NPs）上吸附的水之间的配体交换反应。区分了具有不同反应性的三种不同类型的界面水。吸附的水分子的迁移率通过双极过滤〜1H SSNMR表征。我们的实验结果表明，吸附的水可以分为三个不同的层：（i）刚度有限的刚性水物种，最接近TiO2 NPs的表面，（ii）较少地受限于TiO2 NPs的流动性水种，以及（iii）高迁移率的水分子。第三层中的水可以用OLA代替，而第一层和第二层中的水则保持完整。具有最高迁移率的界面水具有最强的反应性的发现对于调整TiO2 NP的亲水和疏水性能具有指导意义。

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