多孔草酸氧钛粉体的制备与物性分析

Preparation and physical property analysis of porous oxalate titanate powder

草酸氧钛是巨电流变效应产生的关键物质之一,以钛酸四丁酯和草酸为溶质,无水乙醇为溶剂,采用共沉淀法制备多孔草酸氧钛粉体。运用XRD、SEM,激光粒度分析仪等对材料成分,颗粒形貌、粒径大小,导电性等进行物性分析。然后用量角法研究水和硅油在其表面的浸润性。结果表明,粉体的平均粒径5μm左右,大小基本呈正态分布。颗粒近似球形,表面均匀的布满纳米级孔隙;表面水在材料表面的接触角在26.8~31.1°之间,硅油在样品表面的接触角在9.5~11.5°之间。草酸氧钛对水和硅油都有很好的润湿性。浸润性与水浴温度和溶液pH值的关系不大。在不同水浴温度30,40,50,60和70℃,pH值=2条件下制备的草酸氧钛对水和硅油的浸润角随着水浴温度的变化基本保持不变,但硅油比水在样品表面的浸润性要好。通过四探针法测量,其电阻率>1GΩ·cm,说明该材料为绝缘体。

Titanium oxalate is one of the key substances of the giant electrorheological effect material. In this paper, tetrabutyl titanate and oxalic acid were used as solute, and anhydrous ethanol was used as solvent to prepare porous titanyl oxalate powder by coprecipitation method. Physical properties such as particle composition, particle size, particle distribution, and conductivity were analyzed by XRD, SEM, laser particle size analyzer, etc. Then, the infiltration property of water and silicone oil on the surface was studied by the angle method. The results show that the average particle size of the powder was about 5 um, and the size was basically normal distribution. The particles were approximately spherical, and the surface was evenly covered with nano-scale pores. The contact angle of surface water on the surface of the material was between 26.8 and 31.1°, while the contact angle of the silicone oil on the surface of the sample was between 9.5 and 11.5°. Titanium oxalate had good wettability to both water and silicone oils. The wettability had little to do with the bath temperature and the pH of the solution. The contact angle of the surface of the titanyl oxalate prepared at conditions of 30,40,50,60 and 70 ℃, and pH=2 did not change greatly with the change of the bath temperature, but the wettability of the silicone oil on the surface of the sample was better than that of the water. Its resistivity was greater than 1 GΩ·cm measured by a four-probe method. It was an insulator.