• 文献标题:   Effects of functionalization on energy storage properties and thermal conductivity of graphene/n-octadecane composite phase change materials
  • 文献类型:   Article
  • 作  者:   YUAN P, ZHANG P, LIANG T, ZHAI SP, YANG DG
  • 作者关键词:  
  • 出版物名称:   JOURNAL OF MATERIALS SCIENCE
  • ISSN:   0022-2461 EI 1573-4803
  • 通讯作者地址:   Guilin Univ Elect Technol
  • 被引频次:   6
  • DOI:   10.1007/s10853-018-2883-2
  • 出版年:   2019

▎ 摘  要

Paraffin-based nanocomposites are widely used in the energy, microelectronics and aerospace industry as thermal energy storage materials due to their outstanding thermophysical properties. This paper investigates the effects of functionalization on thermal properties of graphene/n-octadecane nanocomposite during phase transition by using non-equilibrium molecular dynamics simulation. Different composite systems containing pristine graphene and graphene functionalized by hydroxyl, carboxyl and ethyl are constructed and studied. The results indicate that the thermal properties like diffusion coefficient, phase change temperature, heat capacity and thermal conductivity can be changed by both the functional types and functional coverage. Comparing with the unfunctionalized system, the system functionalized by ethyl obtained a 10K increase in phase change temperature, a 12% increase in isobaric heat capacity at 300K and a 59.8% increase in thermal conductivity at 320K, and these values are larger than that of the systems functionalized by carboxyl and ethyl. The present findings provide a better understanding of the thermal mechanism of graphene/paraffin nanocomposites and effective guidance for improving their thermophysical properties.