热泳
材料科学
复合材料
温度梯度
复合数
各向异性
微尺度热泳
热导率
纳米颗粒
纳米技术
纳米流体
光学
生物物理学
物理
量子力学
生物
作者
Seong‐Bae Min,Mingeun Kim,Kyu Hyun,Cheol‐Woo Ahn,Chae Bin Kim
出处
期刊:Polymer Testing
[Elsevier]
日期:2023-01-01
卷期号:117: 107838-107838
被引量:8
标识
DOI:10.1016/j.polymertesting.2022.107838
摘要
To achieve efficient heat dissipation using polymer composites, it is important to optimize the heat conduction pathway. Therefore, manipulating the orientation of thermally conductive and anisotropic fillers in composites represents a judicious strategy. So far, external fields have been applied to align fillers within the matrix. However, these processes are energy-intensive and require stimuli-responsive fillers through surface modification, further complicating the process and deteriorating filler thermal conductivity. Herein, to these ends, a facile method for manufacturing composite with an orientation-controlled model anisotropic filler, hexagonal boron nitride (h-BN), was proposed by harnessing thermophoresis. Thermophoresis causes movement and/or rotation of solid particles in a fluid with a steady temperature gradient. A suspension of UV-curable monomer with well-dispersed h-BN was subjected to a temperature gradient, inducing filler rotation via thermophoresis. A subsequent photo-curing yielded a solid composite with the frozen h-BN aligned in a direction agreed with expected for thermophoresis, as indicated by the anisotropic thermal conductivity measurement and cross-sectional scanning electron microscopy (SEM) observation. Additionally, the theoretically estimated Peclet number, induced by thermophoresis, was higher than the experimentally determined value required to align suspended h-BN. To our best knowledge, the current study is the first experimental demonstration of controlling anisotropic filler orientation using thermophoresis.
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