以SiO2为载体、棕榈醇-棕榈酸-月桂酸为相变材料，采用溶胶-凝胶法制备细粒径SiO2基相变调湿复合材料，以中位径(d50)为评价指标，采用激光粒度分析仪研究了溶液溶质浓度、超声时间、超声频率及分散介质对材料粒度的影响. 结果表明，激光粒度分析仪可用于检测SiO2基相变调湿复合材料的粒度分布，水对材料的分散效果比乙醇好，以水为分散介质，材料最佳溶质浓度为5~10 g/L，最佳超声时间为15 min以上，最佳超声功率大于400 W.

Using SiO2 as the carrier and hexadecanol-palmitic acid-lauric acid as a phase change material, SiO2-based phase change and humidity controlling composite materials were prepared by the sol-gel process. The effects of solute concentration, ultrasonic time, ultrasonic power and dispersing medium on the particle size measurements were investigated by using median particle diameters (d50) as an evaluation indicator. The results indicated that the laser particle size analyzer (test range 1~10000 nm) is applicable to the particle size measurement of SiO2-based phase change and humidity controlling composite materials showing high reproducibility. The dispersion effect of water is better than that of alcohol. When the solute concentrationwas 5~10 g/L, the needed ultrasonic time was longer than 15 min and ultrasonic power was higher than 400 W, optimum dispersion results of SiO2-based phase change and humidity controlling composite materials can be achieved using water as the dispersing medium.