(a) Graphene is oriented in a strong magnetic field to form an anisotropic structure. The arrows in the figure indicate the direction of the magnetic field. (b) The graphene/PDMS thermal conductivity is related to the graphene mass fraction and structure. Isotropic represents the thermal conductivity of an isotropic sample, Anistropic∥ represents the thermal conductivity parallel to the direction of the magnetic field, and Anisotropic⊥ represents the thermal conductivity perpendicular to the direction of the magnetic field.

Recently, the research team of the Institute of Advanced Manufacturing Technology, Chinese Academy of Sciences, Hefei Institute of Materials Science and Technology, Wang Xiaojie's research team proposed the idea of ​​mixing a small amount of graphene with polydimethylsiloxane (PDMS) to enhance the thermal conductivity of PDMS, and with the strong magnetic field science. The center Fang Jun's research group cooperated to prepare anisotropic graphene/PDMS composites under a 10 Tesla magnetic field device. The research results of this research group show that the orientation of graphene under a strong magnetic field can significantly increase the thermal conductivity of PDMS. The research results were published in Composites Science and Technology.

PDMS, as a kind of polymer organic silicon polymer, has high optical transparency, chemical inertness, non-toxic, non-flammable and other characteristics, and is widely used in many fields such as bio-micro-electromechanical systems, microfluidic devices, and flexible electronic devices. However, the low thermal conductivity of PDMS severely restricts its application function. In recent years, researchers have continued to explore ways to improve the thermal conductivity of polymers by filling high thermal conductivity fillers. However, it is difficult to significantly increase the thermal conductivity of polymers by ensuring the advantages of flexibility of the polymer itself.

The group chose graphene (thermal conductivity as high as 5000W·m-1·K-1 at room temperature) as a thermally conductive filler. After being evenly mixed with the PDMS matrix, the graphene is oriented to form an anisotropic layer under a strong magnetic field of 10T. The special structure, so as to effectively enhance the thermal conductivity of PDMS. The results show that the thermal conductivity of anisotropic graphene/PDMS is 174% higher than that of pure PDMS material when the mass fraction of graphene is 3%. And, with such low graphene filling, PDMS can maintain its good flexibility and biocompatibility. In this study, the method of aligning graphene to form an anisotropic structure under a strong magnetic field can effectively improve the thermal conductivity of the composite material and has a good application prospect.

The study was supported by the Natural Science Foundation of Anhui Province, Chongqing Basic and Frontier Research Key Projects, and Changzhou Applied Basic Research Program.

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