Hydration and Thermal Expansion in Anatase Nanoparticles

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• 作者：He Zhu ; Qiang Li ; Yang Ren ; Longlong Fan ; Jun Chen ; Jinxia Deng and Xianran Xing
• 刊名：Advanced Materials
• 出版年：2016
• 出版时间：August 24, 2016
• 年：2016
• 卷：28
• 期：32
• 页码：6894-6899
• 全文大小：1993K
• ISSN：1521-4095

文摘

A tunable thermal expansion is reported in nanosized anatase by taking advantage of surface hydration. The coefficient of thermal expansion of 4 nm TiO₂ along a-axis is negative with a hydrated surface and is positive without a hydrated surface. High-energy synchrotron X-ray pair distribution function analysis combined with ab initio calculations on the specific hydrated surface are carried out to reveal the local structure distortion that is responsible for the unusual negative thermal expansion.