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Kinetic Analysis of Secondary Crystal Growth for Hydrotalcite Film Formation

机译:水滑石成膜过程中二次晶体生长的动力学分析

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摘要

Hydrotalcite films find application in many areas of current importance, including catalysis, membranes, anticorrosion coating materials and sensors, because of their flexibility of composition modification. Conventional methods of hydrotalcite film synthesis have their limitations. For instance, the physical deposition method can result in weak interaction between particles and the in situ synthesis method can only be applied in limited synthetic conditions. In this study, hydrotalcite film was synthesized by a novel secondary crystal growth method that involved two main stages. In the first stage, primarily synthesized hydrotalcite seeds were deposited on a support. Then, secondary crystal growth was carried out by hydrothermal treatment to obtain the hydrotalcite film. Various synthetic conditions and methods were investigated to optimize conditions for the formation of hydrotalcite seeds and films. The secondary crystal growth of hydrotalcite films was also monitored to understand the mechanism and kinetics of crystal growth. The results showed that hydrotalcite crystals grow well with vertically oriented morphology when a coprecipitation method is used at pH 10. Solid state kinetic analysis showed that the secondary crystal growth of hydrotalcite can be explained by the nucleation and nuclei growth mechanism.
机译:水滑石膜由于其组成改性的灵活性而在许多当前重要领域得到应用,包括催化,膜,防腐涂料和传感器。水滑石薄膜合成的常规方法有其局限性。例如,物理沉积方法可能导致粒子之间的弱相互作用,而原位合成方法只能在有限的合成条件下应用。在这项研究中,通过一种新的二次晶体生长方法合成了水滑石膜,该方法涉及两个主要阶段。在第一阶段,将最初合成的水滑石种子沉积在载体上。然后,通过水热处理进行二次晶体生长以获得水滑石膜。研究了各种合成条件和方法以优化形成水滑石种子和薄膜的条件。还监测了水滑石薄膜的二次晶体生长,以了解晶体生长的机理和动力学。结果表明,当在pH 10下使用共沉淀方法时,水滑石晶体生长良好,并具有垂直取向的形态。固态动力学分析表明,水滑石的二次晶体生长可以用成核和成核机理来解释。

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