二氧化钛/钛酸盐纳米粉体的晶体生长机理研究进展

二氧化钛/钛酸盐纳米材料的晶型、尺寸、形貌和微结构等特征对物理化学性能有着至关重要的影响。晶体生长过程包括晶型转变和形貌演化等行为。本文综述了近年来在二氧化钛/钛酸盐纳米粉体材料晶型与形貌的控制合成工作中, 材料晶型转变和形貌演化行为方面的研究进展。对奥斯特瓦尔德规则、奥斯特瓦尔德熟化机制、柯肯达尔效应和定向附着生长模式等重要的机理进行了阐述, 并将晶体生长机理应用于二氧化钛/钛酸盐纳米粉体材料的合成过程中。不仅利用上述晶体生长机理解释了不同晶型、不同形貌二氧化钛/钛酸盐纳米粉体材料的生成原因, 并且利用晶体生长机理指导二氧化钛/钛酸盐纳米粉体材料晶型与形貌的控制合成工作。

Research Progress on Crystal Growth Mechanism of Titania/Titanate Nano-powder Materials

Chemical and physical properties of titania/titanate nanomaterials should be strongly influenced by their crystalline phases, grain sizes, morphologies and microstructures. The process of crystal growth contains phase transition and morphological evolution behavior. In this review, the crystal phase transition mechanisms and morphology evolution models were elucidated based on the recent research works of crystal phase and morphology controlled synthesis of titania/titanate nano-powder materials, which included Ostwald Ripening, Ostwald’s step rule, Oriented Attachment Growth, Kirkendall Effect, etc. These phase transition mechanisms and morphology evolution models not only offer explanations for the formation of titania/titanate nano-powder materials with different phases and morphologies, but also give a guidance of phase and morphology controlled synthesis of titania/titanate nano-powder materials.