月桂酸/二氧化硅复合相变储能材料的制备与性能

Preparation and Properties of Lauric Acid/SiO_2 Phase Change Energy Storage Composite Materials

以月桂酸为相变材料,二氧化硅为基体,采用溶胶-凝胶法将相变材料嵌入到SiO2网络空间内,制备出月桂酸/二氧化硅复合相变储能材料。采用IR,SEM及DSC对复合相变储能材料进行了结构、形貌以及热性能表征。结果表明:含相变材料69.1%质量分数的复合材料相变温度为43.1℃,相变潜热高达104.64J/g,相变材料均匀地嵌入到SiO2网络空间内,发生相变时不泄露。同时二氧化硅作为基体材料形成空间传热网格,较大提高了相变材料的导热性能。

Lauric acid was imbedded into the net of silicon dioxide（SiO2） to preparing lauric acid/silicon dioxide phase change energy storage composite material by sol-gel method.In such a composite,lauric acid served as a latent heat storage material and silicon dioxide acts as a supporting material.The structure,morphology,and thermal performance of the composite were characterized by IR,SEM and DSC.The results showed that the composite containing 69.1%（mass fraction） lauric acid had a melting temperature of 43.1℃ and latent heat of 104.64J/g.Lauric acid was uniformly imbedded into the net of silicon dioxide without melted leakage from the composite.The thermal conductivity of the phase change material could be improved effectively by using silicon dioxide as a supporting material.