The composites comprising vertically aligned network of copper nanowires (CuNWs) in the presence of cellulose nanofibers were fabricated by using the freeze‐templating method and the effect of aspect ratio (A/R) of CuNWs on the thermal conductivity of epoxy composites was investigated. The thermal conductivity of epoxy composites increased to 0.79 W m⁻¹ K⁻¹ at 1.12 vol% of high A/R CuNWs loading, corresponding to the thermal conductivity enhancement of 365% as compared to the pure epoxy. The thermal conductivity of vertically aligned higher A/R CuNWs/epoxy, which is 38.5% and 51.9% higher than those of the lower A/R CuNWs and the randomly aligned CuNWs, respectively. The application of the epoxy composites in heat dissipation was demonstrated by the temperature changes of composites on a hot plate with the increase of heating time. These results indicate that the thermally conductive composites in this study could be applied for thermal dissipating materials in electronic devices.

中文翻译：

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纤维素纳米纤维存在下垂直排列的铜纳米线的长径比对环氧复合材料导热系数的影响

采用冷冻模板法制备了在纤维素纳米纤维存在下由铜纳米线（CuNWs）垂直排列的网络组成的复合材料，并研究了纵横比（A / R）对环氧复合材料导热性的影响。环氧复合材料的导热系数提高到0.79 W m ^-1 K ^-1在高A / R CuNWs负载的1.12％（体积）下，与纯环氧树脂相比，导热率提高了365％。垂直排列的较高A / R CuNWs /环氧树脂的热导率分别比较低排列的A / R CuNWs和无规排列的CuNWs高38.5％和51.9％。随着加热时间的增加，复合材料在热板上的温度变化证明了环氧复合材料在散热中的应用。这些结果表明，本研究中的导热复合材料可用于电子设备中的散热材料。