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Metastable nature of titanate nanotubes in an alkaline environment

机译:碱性环境中钛酸酯纳米管的亚稳态性质

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摘要

A systematic analysis of the effect of the composition and temperature of a NaOH/KOH binary aqueous mixture on the morphological properties of titanate nanostructures formed during alkaline hydrothermal transformation of TiO _2 under atmospheric conditions has been performed using high-resolution transmission electron microscopy techniques. All observed nanostructures, including nanosheets, nanotubes, nanofibers, and nanoparticles, have been mapped over a wide range of compositions (from pure NaOH to pure KOH) and temperatures (from 50 to 110 °C). Attempts to intensify the TiO _2 transformation via addition of titanate nanotube seeds or agitation of the reaction mixture have resulted in formation of thermodynamically stable nanofibers rather than nanotubes. The effects of kinetic and thermodynamic control of the reaction are discussed with regard to the transformation of TiO_2 to nanosheets, nanotubes, and nanofibers.
机译:使用高分辨率透射电子显微镜技术,系统地分析了NaOH / KOH二元水性混合物的组成和温度对TiO_2碱性水热转化过程中在大气条件下形成的钛酸酯纳米结构形态特性的影响。已观察到所有观察到的纳米结构,包括纳米片,纳米管,纳米纤维和纳米颗粒,其成分分布范围很广(从纯NaOH到纯KOH)和温度(从50到110°C)。通过添加钛酸酯纳米管种子或搅拌反应混合物来增强TiO _2转化的尝试已导致形成热力学稳定的纳米纤维而不是纳米管。关于TiO_2向纳米片,纳米管和纳米纤维的转化,讨论了反应动力学和热力学控制的影响。

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