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Thermo analytical study of phase transformation of TiO2 nanoparticles prepared using mono and di α-hydroxy acid water-soluble precursor by hydrothermal technique
Phase Transitions ( IF 1.6 ) Pub Date : 2020-05-29
S. Kalaiarasi, S. A. Martin Britto Dhas, M. Jose, S. Jerome Das

In this article, the isoconversional crystallization behavior of TiO2 nanoparticles prepared using titanium glycolate and titanium malate water-soluble precursors at alkaline and acidic conditions was investigated. Thermal decomposition experiments were carried out using thermo gravimetric (TG) analysis and the phase structure was determined by powdered X-ray diffraction (PXRD) analysis. The phase stability of the TiO2 NPs prepared using titanium malate complex was found to be better than that prepared using titanium glycolate water-soluble complex, especially in terms of loss in weight per cent and decomposition analysis. Apparent activation energies were also determined for both the samples prepared at pH 2, 4, 6, 8, 10 and 12. These results showed the ability of primary and secondary nucleation in shifting decomposition temperature that in turn increases the phase transformation temperature, by minimizing the energy through fraction reacted required to reach the crystalline state.



中文翻译:

单和二α-羟基酸水溶性前驱体水热法制备TiO2纳米粒子相变的热分析研究

本文研究了乙醇酸钛和苹果酸钛水溶性前体在碱性和酸性条件下制备的TiO 2纳米粒子的同相转化行为。使用热重(TG)分析进行热分解实验,并通过粉末X射线衍射(PXRD)分析确定相结构。TiO 2的相稳定性发现使用苹果酸钛配合物制备的NP比使用乙醇酸钛水溶性配合物制备的NP更好,特别是在重量损失和分解分析方面。还确定了在pH 2、4、6、8、10和12下制备的两个样品的表观活化能。这些结果表明,一次和二次成核在转移分解温度中的能力,通过最小化,从而提高了相变温度。通过馏分反应所需要的能量达到结晶态。

更新日期:2020-05-29
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