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Predicting the effective thermal conductivity of silica/clay mineral nanocomposite aerogels

机译：预测二氧化硅/粘土矿物纳米复合气凝胶的有效导热系数

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摘要

The crucial effect of the morphology of nanocomposite aerogel on its effective thermal conductivity caused the presence of comprehensive theoretical investigation. Classic unit cell model provided an analytical relationship between microstructure and thermal conductivity of pristine silica aerogels, but the predicted results showed more than 250% deviation from the experimental results. In this work, the classic unit cell model was modified for nanocomposite aerogel by considering the effect of phonon scattering, secondary porosity, and clay mineral presence. The modified classic unit cell model (MCUM) acted as a powerful tool in the analysis of thermal conductivity mechanism of silica/clay mineral nanocomposite aerogels. Clay mineral was utilized to improve thermal radiation insulation properties of nanocomposite aerogels. Experimental results revealed that addition of 7 wt% clay mineral to silica aerogel led to a 55% reduction in thermal radiation heat transport at 700 degrees C. MCUM showed good agreement with experimental results with a less than 10% deviation for neat and nanocomposite aerogel. (C) 2019 Elsevier Ltd. All rights reserved.
机译：纳米复合气凝胶的形态对其有效导热性的关键影响引起了广泛的理论研究。经典的晶胞模型提供了原始二氧化硅气凝胶的微观结构和热导率之间的分析关系，但预测结果显示与实验结果有超过250％的偏差。在这项工作中，通过考虑声子散射，次生孔隙度和粘土矿物存在的影响，对纳米复合气凝胶的经典晶胞模型进行了修改。改进的经典单位单元模型（MCUM）在分析二氧化硅/粘土矿物纳米复合气凝胶的热导率机理中充当了强大的工具。粘土矿物被用来改善纳米复合气凝胶的热辐射隔热性能。实验结果表明，向二氧化硅气凝胶中添加7 wt％的粘土矿物质可使700℃的热辐射传热减少55％。MCUM与实验结果吻合良好，纯净和纳米复合气凝胶的偏差小于10％。 （C）2019 Elsevier Ltd.保留所有权利。

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