Ultrawhite BaSO4 Paints and Films for Remarkable Daytime Subambient Radiative Cooling,ACS Applied Materials & Interfaces

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Ultrawhite BaSO4 Paints and Films for Remarkable Daytime Subambient Radiative Cooling
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-04-15 , DOI: 10.1021/acsami.1c02368
Xiangyu Li _{1,

2} , Joseph Peoples _{1,

2} , Peiyan Yao _{1,

2} , Xiulin Ruan _{1,

2}

Affiliation

Radiative cooling is a passive cooling technology that offers great promises to reduce space cooling cost, combat the urban island effect, and alleviate the global warming. To achieve passive daytime radiative cooling, current state-of-the-art solutions often utilize complicated multilayer structures or a reflective metal layer, limiting their applications in many fields. Attempts have been made to achieve passive daytime radiative cooling with single-layer paints, but they often require a thick coating or show partial daytime cooling. In this work, we experimentally demonstrate remarkable full-daytime subambient cooling performance with both BaSO₄ nanoparticle films and BaSO₄ nanocomposite paints. BaSO₄ has a high electron band gap for low solar absorptance and phonon resonance at 9 μm for high sky window emissivity. With an appropriate particle size and a broad particle size distribution, the BaSO₄ nanoparticle film reaches an ultrahigh solar reflectance of 97.6% and a high sky window emissivity of 0.96. During field tests, the BaSO₄ film stays more than 4.5 °C below ambient temperature or achieves an average cooling power of 117 W/m². The BaSO₄-acrylic paint is developed with a 60% volume concentration to enhance the reliability in outdoor applications, achieving a solar reflectance of 98.1% and a sky window emissivity of 0.95. Field tests indicate similar cooling performance to the BaSO₄ films. Overall, our BaSO₄-acrylic paint shows a standard figure of merit of 0.77, which is among the highest of radiative cooling solutions while providing great reliability, convenient paint form, ease of use, and compatibility with the commercial paint fabrication process.

中文翻译：

超白BaSO ₄涂料和膜，可实现出色的白天亚低温辐射冷却

辐射冷却是一种被动冷却技术，它有望降低空间冷却成本，应对城市孤岛效应并缓解全球变暖。为了实现白天的被动辐射冷却，当前最先进的解决方案通常利用复杂的多层结构或反射金属层，从而限制了它们在许多领域中的应用。已经尝试用单层涂料实现被动的白天辐射冷却，但是它们通常需要厚的涂层或表现出部分的白天冷却。在这项工作中，我们通过实验证明了BaSO ₄纳米颗粒薄膜和BaSO ₄纳米复合涂料具有出色的全天低温环境冷却性能。硫酸钡₄具有高的电子带隙，可实现低的日光吸收率和9μm的声子共振，以实现高的天窗发射率。具有合适的粒径和宽的粒径分布，BaSO ₄纳米粒子膜可达到97.6％的超高太阳反射率和0.96的高天窗发射率。在现场测试期间，BaSO ₄薄膜的温度比环境温度低4.5°C，或者平均冷却功率为117 W / m ²。开发了浓度为60％的BaSO _4-丙烯酸涂料，以提高户外应用的可靠性，实现了98.1％的日光反射率和0.95的天窗发射率。现场测试表明其冷却性能与BaSO ₄相似电影。总体而言，我们的BaSO _4-丙烯酸涂料的标准品质因数为0.77，是最高的辐射冷却解决方案之一，同时具有出色的可靠性，方便的涂料形式，易用性以及与商业涂料制造工艺的兼容性。

更新日期：2021-05-12

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