胶溶-水热晶化过程中纳米TiO2相稳定性研究 |
Phase Stability of Nanocrystaline Anatase and Rutile TiO2 in Sols Peptized via Hydrothermal Crystallization Process |
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摘要: |
关键词: 纳米TiO2 胶溶 水热晶化 XRD |
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Abstract: The phase stability of nanocrystaline anatase and rutile TiO2 in sols peptized at different temperature has been studied by X-ray Diffraction (XRD) and thermodynamical analysis. The results show that the stability of nanocrystaline TiO2 of different crystal types is a function of particle size. According to the thermodynamical analysis, anatase TiO2 becomes more stable than rutile TiO2 when the particle size is less than ca. 14 nm, which coincides with the experimental data obtained by XRD. Both surface Gibbs free energy and surface stress play important roles in the thermodynamically phase stability. Comparing the data calculated thermodynamically with the experimental results obtained under different temperatures, it is found that the constant K in the function relation, f=KGS, between surface free energy GS and surface stress f is temperature dependent and equal to 1 at 333 K and 2 at 453 K, respectively. |
Keywords: nanocrystaline TiO2 peptization hydrothermal crystallization XRD |
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全文下载次数: 1911 |
唐浩东,肖莎,吕德义,卞飞荣,许可,郑遗凡,刘化章,李小年.胶溶-水热晶化过程中纳米TiO2相稳定性研究[J].无机化学学报,2007,23(3):494-498. |
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