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Effect of Particle Size and Aggregation on Thermal Conductivity of Metal-Polymer Nanocomposite

机译：粒度和聚集对金属聚合物纳米复合材料导热系数的影响

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摘要

Metal nanoparticle has been a promising option for fillers in thermal interface materials due to its low cost and ease of fabrication. However, nanoparticle aggregation effect is not well understood because of its complexity. Theoretical models, like effective medium approximation model, barely cover aggregation effect. In this work, we have fabricated nickel-epoxy nanocomposites and observed higher thermal conductivity than effective medium theory predicts. Smaller particles are also found to show higher thermal conductivity, contrary to classical models indicate. A two-level effective medium approximation (EMA) model is developed to account for aggregation effect and to explain the size-dependent enhancement of thermal conductivity by introducing local concentration in aggregation structures.
机译：金属纳米颗粒由于其低成本和易于制造而已成为热界面材料中填料的有前途的选择。然而，由于其复杂性，纳米颗粒的聚集效应尚不能很好地理解。理论模型（如有效的介质近似模型）几乎无法涵盖聚集效应。在这项工作中，我们制备了镍-环氧树脂纳米复合材料，并观察到比有效介质理论预测的更高的导热率。与经典模型相反，还发现较小的颗粒具有较高的导热性。建立了两级有效介质近似（EMA）模型，以解决聚集效应并通过在聚集结构中引入局部浓度来解释导热系数的尺寸依赖性增强。

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  • 来源
    《Journal of Heat Transfer》 |2017年第2期|022401.1-022401.5|共5页
  • 作者

    Xiangyu Li; Wonjun Park; Yong P. Chen; Xiulin Ruan;

  • 作者单位

    School of Mechanical Engineering Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907;

    School of Mechanical Engineering Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907;

    School of Mechanical Engineering Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907;

    School of Mechanical Engineerin Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907;

  • 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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