Bio-Inspired Stretchable Selective Emitters Based on Corrugated Nickel for Personal Thermal Management

IF 2.7 3区工程技术 Q2 ENGINEERING, MECHANICAL

Nanoscale and Microscale Thermophysical Engineering Pub Date : 2019-03-14 DOI:10.1080/15567265.2019.1586017

Martí Sala-Casanovas, Anirudh Krishna, Ziqi Yu, Jaeho Lee

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引用次数: 18

Abstract

ABSTRACT While dynamic photonic materials have attracted much attention and there are well-known examples of color-changing species in nature, dynamic thermal control via modulation of optical properties has made relatively little progress. By replicating unique properties of desert ants and chameleons, here we present a stretchable selective emitter based on corrugated nickel that can modulate the emissivity to provide dynamic thermal control on human bodies. By evaporating nickel on a pre-strained polymer, we create 700-nm periodic corrugations that increase the nickel absorptivity from 0.3 to 0.7 in 0.2–2.5 µm wavelengths due to multiple scattering, as supported by spectroscopy and computations. The optical change is reversible and accompanies ambient surface temperature variations in 305–315 K. We demonstrate a wearable system, and the corrugated nickel on a human body at 309 K allows a heat flux of 62 Wm−2 out of the skin when stretched and 79 Wm−2 into the skin when released.

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基于波纹镍的个人热管理生物启发可拉伸选择性发射器

虽然动态光子材料引起了人们的广泛关注，自然界中也有众所周知的变色物种，但通过调制光学性质来实现动态热控制的进展相对较少。通过复制沙漠蚂蚁和变色龙的独特特性，我们提出了一种基于波纹镍的可拉伸选择性发射器，可以调节发射率，为人体提供动态热控制。通过在预应变聚合物上蒸发镍，我们创造了700 nm的周期性波纹，由于多次散射，在0.2-2.5µm波长内将镍的吸收率从0.3提高到0.7，这得到了光谱和计算的支持。光学变化是可逆的，并且伴随着305-315 K环境表面温度的变化。我们展示了一个可穿戴系统，人体上的波纹镍在309 K下拉伸时允许62 Wm−2的热流流出皮肤，释放时允许79 Wm−2的热流进入皮肤。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nanoscale and Microscale Thermophysical Engineering 工程技术-材料科学：表征与测试

CiteScore

5.90

自引率

2.40%

发文量

审稿时长

3.3 months

期刊介绍： Nanoscale and Microscale Thermophysical Engineering is a journal covering the basic science and engineering of nanoscale and microscale energy and mass transport, conversion, and storage processes. In addition, the journal addresses the uses of these principles for device and system applications in the fields of energy, environment, information, medicine, and transportation. The journal publishes both original research articles and reviews of historical accounts, latest progresses, and future directions in this rapidly advancing field. Papers deal with such topics as: transport and interactions of electrons, phonons, photons, and spins in solids, interfacial energy transport and phase change processes, microscale and nanoscale fluid and mass transport and chemical reaction, molecular-level energy transport, storage, conversion, reaction, and phase transition, near field thermal radiation and plasmonic effects, ultrafast and high spatial resolution measurements, multi length and time scale modeling and computations, processing of nanostructured materials, including composites, micro and nanoscale manufacturing, energy conversion and storage devices and systems, thermal management devices and systems, microfluidic and nanofluidic devices and systems, molecular analysis devices and systems.