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Dual Phase Change Thermal Diodes for Enhanced Rectification Ratios: Theory and Experiment

机译：具有增强整流比的双相变热敏二极管：理论与实验

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摘要

Thermal diodes are materials that allow for the preferential directional transport of heat and are highly promising devices for energy conservation, energy harvesting, and information processing applications. One form of a thermal diode consists of the junction between a phase change and phase invariant material, with rectification ratios that scale with the square root of the ratio of thermal conductivities of the two phases. In this work, the authors introduce and analyse the concept of a Dual Phase Change Thermal Diode (DPCTD) as the junction of two phase change materials with similar phase boundary temperatures but opposite temperature coefficients of thermal conductivity. Such systems possess a significantly enhanced optimal scaling of the rectification ratio as the square root of the product of the thermal conductivity ratios. Furthermore, the authors experimentally design and fabricate an ambient DPCTD enabled by the junction of an octadecane-impregnated polystyrene foam, polymerized using a high internal phase emulsion template (PFH-O) and a poly(N-isopropylacrylamide) (PNIPAM) aqueous solution. The DPCTD shows a significantly enhanced thermal rectification ratio both experimentally (2.6) and theoretically (2.6) as compared with ideal thermal diodes composed only of the constituent materials.
机译：热敏二极管是允许热量优先定向传输的材料，是用于节能，能量收集和信息处理应用的极有前途的设备。热二极管的一种形式是由相变和相不变材料之间的结组成，其整流比与两相热导率之比的平方根成比例。在这项工作中，作者介绍并分析了双相变热二极管（DPCTD）的概念，该概念是两种相变材料的交界处，它们具有相似的相界温度但具有相反的导热系数。这样的系统具有显着增强的整流比的最佳缩放比例，作为热导比的乘积的平方根。此外，作者们通过实验设计和制造了一种环境DPCTD，该环境通过十八烷浸渍的聚苯乙烯泡沫的连接实现，该泡沫使用高内相乳液模板（PFH-O）和聚（N-异丙基丙烯酰胺）（PNIPAM）水溶液进行聚合。与仅由组成材料组成的理想热敏二极管相比，DPCTD在实验（2.6）和理论（2.6）上均显示出显着提高的热整流率。

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