石墨烯气凝胶/二十烷相变材料的制备及性能研究

Preparation and Performance of Graphene Aerogel/Eicosane Phase Change Material

摘要:

以氧化石墨烯（GO），二十烷（Eicosan）为原料，先采用胶体团聚法制备还原-氧化石墨烯气凝胶，再通过自扩散获得了还原氧化石墨烯气凝胶/二十烷复合相变材料,研究了复合材料与性能的关系。采用热重和差示量热扫描仪测试了二十烷和复合材料的热性能，确认了二十烷质量分数对复合材料的焓值的关系以及相变循环次数对材料稳定性的影响。结果表明：复合材料的焓值与二十烷的质量分数成正比；经过50次相变循环后，PCM4仍然保持稳定性。导热性能分析表明, 还原氧化石墨烯气凝胶可以改善二十烷的热导率。此外，通过太阳光模拟测试，计算出复合材料的光热转换效率为55%。

Abstract:

The reduced-graphene oxide aerogel was prepared by the colloidal agglomeration method. Using graphene oxide (GO) as the raw material, the reduced graphene oxide aerogel/eicosane composite phase change material was obtained through self-diffusion eicosane (Eicosane). Finally, the relationship between composite materials and performance was explored. Thermogravimetric (TGA) and differential calorimetry scanners (DSC) were used to test the thermal properties of eicosane and composite materials, the relationship between the mass fraction of eicosane and the enthalpy of the composite material was confirmed, and the influence of the phase change cycle on the materials stability was further explored. The results showed that the enthalpy of the composite was directly proportional to the mass fraction of eicosane. After 50 phase change cycles, PCM4 remains stable. The thermal conductivity analysis displayed that reduced graphene oxide aerogel could improve the thermal conductivity of the eicosane. In addition, through the sunlight simulation test, it is calculated that the light-to-thermal conversion efficiency of the composite material is about 55%.