The effect of grain size on the lattice thermal conductivity of an individual polyacrylonitrile-based carbon fiber
The effect of grain size on the lattice thermal conductivity of an individual polyacrylonitrile-based carbon fiber
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DOI：
10.1016/j.carbon.2012.08.052
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发表时间：
2013-01-01
期刊：
影响因子：
10.9
通讯作者：
Tang, D. W.
中科院分区：
文献类型：
--
作者：
Qiu, L.;Zheng, X. H.;Tang, D. W.
研究了微晶尺寸（L-a）为几个纳米的通用级聚丙烯腈（PAN）基碳纤维的晶格热导率（λ（L））。用改进的3 Ω法测定了不同热处理温度下纤维的λ（L），发现λ（L）与-1/L-a呈线性关系。根据声子散射理论，这一现象可归因于边界散射和点缺陷散射的综合作用。计算了点缺陷散射常数（A），并导出了计算公式。(C)2012爱思唯尔有限公司保留所有权利。
The lattice thermal conductivity (lambda(L)) of general purpose grade polyacrylonitrile (PAN)-based carbon fibers with a crystallite size (L-a) of several nanometers was examined. Using a modified 3 omega, method, the lambda(L) of the fibers with different heat-treatment temperatures were detected, and it was found that the lambda(L) was linearly dependent on -1/L-a. Based on phonon scattering theory, this observation can be attributed to the combined effect of boundary scattering and point-defect scattering. The constant for point-defect scattering (A) was evaluated and a formula was derived. (C) 2012 Elsevier Ltd. All rights reserved.