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采用低热固相化学反应法,一步制备了表面包覆SiO_2的硬脂酸相变储能纳米粒子。由红外光谱、X射线衍射和差示扫描量热法对表面包覆SiO_2的硬脂酸纳米粒子进行了表征。利用动态光散射激光力度仪测定了材料的粒径分布,同时对材料表面包覆前后的接触角进行了测定。结果表明:硬脂酸纳米粒子表面成功包覆了SiO_2层。包覆的硬脂酸纳米粒子为球状,粒径大约为110nm。包覆的硬脂酸纳米粒子相转变温度为61.4℃,相变过程中的焓值为153.1J/g,具有良好的蓄热能力,可用于太阳能利用等方面的储能蓄热。
A low-temperature solid-phase chemical reaction method was used to prepare the stearic acid phase change energy storage nanoparticle with SiO 2 surface coating in one step. The surface-coated SiO 2 stearic acid nanoparticles were characterized by infrared spectroscopy, X-ray diffraction and differential scanning calorimetry. The particle size distribution of the material was measured by dynamic light scattering laser intensity meter, and the contact angle before and after the coating was measured. The results show that the surface of stearic acid nano-particles was successfully coated with SiO_2 layer. The coated stearic acid nanoparticles are spherical and have a particle size of about 110 nm. The phase transition temperature of coated stearic acid nanoparticles was 61.4 ℃, and the enthalpy of phase transition was 153.1J / g. It has good heat storage capacity and can be used for energy storage and heat storage in solar energy utilization.