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选用辛基三甲氧基硅烷偶联剂(Octyltrimethoxysilane,OTMS),对纳米TiO2粉体表面进行疏水处理,制备出具有不同表面能的纳米粒子,对掺杂进入复合相变微胶囊(NC-MicroPCMs)中的纳米粒子量进行控制。应用统计分析软件Minitab16.0设计优化实验,结果显示,当所用疏水处理剂为5%(对芯材重),反应时间20min,温度80℃时,制得粉体的接触角为120°。应用热重分析法计算微胶囊负载的纳米粒子量,结果显示纳米粒子亲疏水性对其负载量有显著影响,粒子表面越疏水,负载在NC-MicroPCMs上的粒子量越多,相关系数R2=0.866。
The surface of nano-TiO2 was hydrophobized by octyltrimethoxysilane (OTMS) to prepare nano-particles with different surface energies. The nano-particles with different surface energy were doped into the composite phase change microcapsules (NC-MicroPCMs) In the amount of nanoparticles to control. The statistical analysis software Minitab16.0 was used to design and optimize the experiment. The results showed that the contact angle of the powder was 120 ° when the hydrophobic treatment agent used was 5% (weight of the core), the reaction time was 20min and the temperature was 80 ℃. Thermogravimetric analysis was used to calculate the amount of nanoparticles loaded on the microcapsules. The results showed that the hydrophilicity and hydrophobicity of the nanoparticles have a significant effect on the loading of the nanoparticles. The more hydrophobic the surface of the particles, the more the particles loaded on the NC-MicroPCMs. The correlation coefficient R2 = 0.866 .