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Array Volume Fraction-Dependent Thermal Transport Properties of Vertically Aligned Carbon Nanotube Arrays

机译:垂直排列的碳纳米管阵列的阵列体积分数相关的热传输性质。

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摘要

Vertically aligned carbon nanotube (CNT) arrays are promising candidates for advanced thermal interface materials (TIMs) since they possess high mechanical compliance and high intrinsic thermal conductivity. However, the overall thermal performance of CNT arrays often falls short of expectations when used as TIMs, and the underlying reasons have yet to be fully understood. In this work, the volume fraction of CNT arrays is demonstrated to be the key factor in determining the CNT array thermal transport properties. By increasing the array volume fraction, both the CNT array effective thermal conductivity and the CNT array-glass thermal contact conductance were experimentally found to increase monotonically. One interesting phenomenon is that the increasing rate of thermal conductivity is larger than that of array volume fraction. Compressive experiments verified that the CNT arrays with lower volume fractions suffer from severe buckling, which results in a further decreasing trend. By understanding the underlying reasons behind this trend, the overall thermal performance of vertically aligned CNT arrays can be further increased.
机译:垂直排列的碳纳米管(CNT)阵列具有较高的机械柔韧性和较高的固有导热性,因此有望成为高级热界面材料(TIM)的候选材料。但是,CNT阵列的整体热性能在用作TIM时常常达不到预期,其根本原因尚待充分理解。在这项工作中,碳纳米管阵列的体积分数被证明是决定碳纳米管阵列热传输性能的关键因素。通过增加阵列体积分数,实验上发现CNT阵列有效热导率和CNT阵列-玻璃热接触电导率都单调增加。一个有趣的现象是热导率的增加率大于阵列体积分数的增加率。压缩实验证明,具有较低体积分数的CNT阵列会发生严重的屈曲,从而导致进一步下降的趋势。通过了解这种趋势背后的根本原因,可以进一步提高垂直排列的CNT阵列的整体热性能。

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  • 来源
    《Journal of Heat Transfer》 |2016年第9期|092401.1-092401.7|共7页
  • 作者单位

    Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui 230026, China Department of Mechanical Engineering, University of California, Berkeley, CA 94720;

    Applied Science and Technology Graduate Group, University of California, Berkeley, CA 94720;

    Department of Mechanical Engineering, University of California, Berkeley, CA 94720 Applied Science and Technology Graduate Group, University of California, Berkeley, CA 94720;

    Applied Science and Technology Graduate Group, University of California, Berkeley, CA 94720 Department of Materials Science and Engineering, University of California, Berkeley, CA 94720 Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720;

    Department of Mechanical Engineering, University of California, Berkeley, CA 94720 Applied Science and Technology Graduate Group, University of California, Berkeley, CA 94720 Department of Materials Science and Engineering, University of California, Berkeley, CA 94720 Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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