石蜡@SnO2-Al2O3微胶囊复合相变材料的合成及其热物性

Synthesis and thermal physical properties of paraffin@SnO2-Al2O3 microcapsule composite phase change materials

通过原位化学沉积的方法制备了石蜡@SnO2-Al2O3微胶囊复合相变材料,采用场发射扫描电子显微镜(SEM)、傅里叶红外光谱仪(FT-IR)以及X射线衍射仪(XRD)等方法测定分析了该复合相变材料的微观表面形貌、化学构成和晶体结构;采用差示扫描量热计(DSC)、热导率仪和热重分析仪(TGA)法测试分析了该复合材料的相变特性、热导率以及热稳定性等热物性。结果表明:原位化学沉积方法可成功制备石蜡@SnO2-Al2O3微胶囊复合相变材料,且石蜡@SnO2-Al2O3复合材料具有明显的核壳结构;石蜡@SnO2-Al2O3微胶囊复合相变材料的相变潜热为85.14J/g,该复合材料的热导率有明显提高,并在190℃以下表现出优异的热稳定性能。

A microcapsule composite phase change material,i.e.,paraffin@SnO2-Al2O3,was synthesized by in-situ chemical precipitation method.The microscopic surface morphology,chemical composition and crystal structure of paraffin@SnO2-Al2O3 were measured by field emission scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FT-IR)and X-ray diffractometry(XRD).The thermal properties such as phase change characteristics,thermal conductivity and thermal stability of paraffin@SnO2-Al2O3 were determined by differential scanning calorimetry(DSC),thermal conductivity meter and thermo-gravimetric analyzer(TGA).The results showed that the obtained paraffin@SnO2-Al2O3 had a core-shell structure with latent heat of 85.14 J/g.Besides,the composite showed significantly improved thermal conductivity and exhibited excellent thermal stability at temperature below 190℃.