Study on Graphene Aerogel Phase Change Composites with Directional Thermal Conduction

Organic phase change materials have great thermal storage performance,but their applications are limited by their low thermal conduction. In this work,for that reason,the graphene aerogel (OGA)was prepared by the liquid nitrogen freezing method. The structure of OGA was adjusted by changing the concentration of graphite oxide (GO)solutions. The graphene aerogel phase change composite (GAP)was prepared with OGA and melted paraffin by the vacuum impregnation method. The influence of the structure of OGA on the thermal performance of GAP was studied experimentally and analyzed by numerical simulations. The results showed that OGA prepared by the liquid nitrogen freezing method had a directionally conductive framework structure,its excellent thermal conduction greatly improved the thermal conduction of GAP. Meanwhile,the thermal storage performance of GAP was improved by the increase of the phase transition enthalpy of paraffin. This discovery is expected to be used to solve the contradiction of GAP between the heat storage performance and the thermal conduction after adding thermal conductivity matrix and to provide help for the development of thermal engineering. © 2023 Cailiao Daobaoshe/ Materials Review. All rights reserved.