高分散钛酸钙纳米粒子的水热法制备

Hydrothemal synthesis of high dispersive calcium titanate nanoparticals

以氯化钙、钛酸丁酯为原料,聚乙烯醇(PVA)为分散剂,用一步水热法获得了高分散的钛酸钙纳米粉体。研究了合成条件对钛酸钙粉体结构和形貌的影响,并利用XRD、TEM、纳米粒度仪和热重分析仪等对样品进行表征。结果表明:保持溶液总体积为43 mL的条件下,选取水热反应温度为200℃,反应时间为6 h,PVA溶液(4 g/L)用量为10 mL,NaOH溶液(5 mol/L)用量为18 mL,可得到粒度均匀、分散性好、粒径只有几个纳米的钛酸钙粉体。对分散剂PVA的作用机理进行了分析。所得产物在高温煅烧后依然可以保持良好的分散性。

High dispersive nanometer calcium titanate（CaTiO3） powder was prepared through one-step hydrothermal method using calcium chloride and tetrabutyl titanate as raw materials,and polyvinyl alcohol as dispersant.Effects of reaction conditions on the structure and morphology of the product were studied in detail.Prepared sample was characterized by XRD,TEM,nano particle size analyzer,and TG-DSC.Results indicated that CaTiO3 powders with uniform particles,satisfactory dispersity,and a size of several nanometers can be obtained under such conditions as 200 ℃ for reaction temperature,6 h for reaction time,10 mL for PVA（4 g/L） volume,18 mL for NaOH（5 mol/L） volume and maintaining a constant total volume of 43 mL.Mechanism of PVA was also analyzed.The obtained product can still maintain a good dispersion even after sintering at high temperature.