材料科学
石墨烯
复合材料
热导率
固化(化学)
剥脱关节
热扩散率
纳米复合材料
散热膏
复合数
表面改性
石墨烯泡沫
热传导
氧化石墨烯纸
纳米技术
化学工程
工程类
物理
量子力学
作者
J. Renteria,Stanislav Legedza,Ruben Salgado,M.P. Balandin,S. Ramirez,Mohammed Ahmed Saadah,Fariborz Kargar,Alexander A. Balandin
标识
DOI:10.1016/j.matdes.2015.08.135
摘要
We report on heat conduction properties of thermal interface materials with self-aligning “magnetic graphene” fillers. Graphene enhanced nano-composites were synthesized by an inexpensive and scalable technique based on liquid-phase exfoliation. Functionalization of graphene and few-layer-graphene flakes with Fe3O4 nanoparticles allowed us to align the fillers in an external magnetic field during dispersion of the thermal paste to the connecting surfaces. The filler alignment results in a strong increase of the apparent thermal conductivity and thermal diffusivity through the layer of nano-composite inserted between two metallic surfaces. The self-aligning “magnetic graphene” fillers improve heat conduction in composites with both curing and non-curing matrix materials. The thermal conductivity enhancement with the oriented fillers is a factor of two larger than that with the random fillers even at the low ~ 1 wt.% of graphene loading. The real-life testing with computer chips demonstrated the temperature rise decrease by as much as 10 °C with use of the non-curing thermal interface material with ~ 1 wt.% of the oriented fillers. Our proof-of-concept experiments suggest that the thermal interface materials with functionalized graphene and few-layer-graphene fillers, which can be oriented during the composite application to the surfaces, can lead to a new method of thermal management of advanced electronics.
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