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arXiv 1408.3922cond-mat.mtrl-sci
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具有分形夹杂结构的双层复合材料的热性能

Thermal properties of composite two-layer systems with a fractal inclusion structure

J. J. Reyes-Salgado, V. Dossetti, B. Bonilla-Capilla, J. L. Carrillo

摘要:

在这项工作中,我们研究了由聚酯树脂和磁铁矿夹杂物制成的板状复合材料两层样品的热输运性质。通过光声光谱和热弛豫实验测量了它们的有效热扩散率和有效热导率。在静磁场的作用下制备复合层,导致各向异性的夹杂物结构与平行于层的表面的磁铁矿颗粒链的形成。在一种双层中,在树脂层的顶部上形成复合层,同时改变它们的相对厚度。这些样本可以通过已知的模型来描述。与此相反,双层具有相同的浓度的夹杂物和相同的厚度的两侧,其中只有它们的夹杂物结构之间的角度是系统地变化,显示出一个非平凡的行为,其热导率作为这个角度的函数。通过空隙度分析,我们根据层间界面的复杂性解释了观察到的热响应。

英文摘要:

In this work, we study the thermal transport properties of platelike composite two-layer samples made of polyester resin and magnetite inclusions. By means of photoacoustic spectroscopy and thermal relaxation, their effective thermal diffusivity and conductivity were experimentally measured. The composite layers were prepared under the action of a static magnetic field, resulting in anisotropic inclusion structures with the formation of chains of magnetite particles parallel to the faces of the layers. In one kind of bilayers, a composite layer was formed on top of a resin layer while their relative thickness was varied. These samples can be described by known models. In contrast, bilayers with the same concentration of inclusions and the same thickness on both sides, where only the angle between their inclusion structures was systematically varied, show a nontrivial behaviour of their thermal conductivity as a function of this angle. Through a lacunarity analysis, we explain the observed thermal response in terms of the complexity of the interface between the layers.

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