Wu Shiwen, Jian Ruda, Zhou Lyu, Tian Siyu, Luo Tengfei, Cui Shuang, Zhao Bo, Xiong Guoping
Department of Mechanical Engineering, The University of Texas at Dallas, Richardson, Texas 75080, United States.
Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States.
ACS Appl Mater Interfaces. 2023 Sep 27;15(38):44820-44826. doi: 10.1021/acsami.3c06296. Epub 2023 Sep 18.
The management of the abundant eggshell biowaste produced worldwide has become a problematic issue due to the generated odor and microorganisms after direct disposal of the eggshell biowaste in landfills. Herein, we propose a new method to convert the hazardous eggshell biowaste to valuable resources for energy management applications. Eggshell-based films are fabricated by embedding eggshell powders into a polymer matrix to achieve highly efficient subambient daytime radiative cooling. Benefiting from the Mie scattering of the eggshell particles/air pores in the solar spectrum and the strong emission of the eggshell in the mid-infrared (mid-IR) range, the eggshell-based films present a high reflection of 0.96 in the solar spectrum and a high emission of 0.95 in the mid-IR range, with notable average temperature reductions of 4.1 and 11 °C below the ambient temperature during daytime and nighttime, respectively. Moreover, the eggshell-based films exhibit excellent flexibility and self-cleaning properties, which are beneficial for practical long-term outdoor applications. Our proposed design provides a new means for environmentally friendly and sustainable management of eggshell biowaste.
由于将蛋壳生物废弃物直接填埋后会产生气味和微生物，全球范围内产生的大量蛋壳生物废弃物的管理已成为一个棘手的问题。在此，我们提出一种新方法，将有害的蛋壳生物废弃物转化为用于能源管理应用的有价值资源。通过将蛋壳粉末嵌入聚合物基质中来制造基于蛋壳的薄膜，以实现高效的亚环境日间辐射冷却。受益于蛋壳颗粒/气孔在太阳光谱中的米氏散射以及蛋壳在中红外（mid-IR）范围内的强发射，基于蛋壳的薄膜在太阳光谱中呈现出0.96的高反射率，在中红外范围内呈现出0.95的高发射率，在白天和夜间平均温度分别比环境温度显著降低4.1和11°C。此外，基于蛋壳的薄膜具有出色的柔韧性和自清洁性能，这有利于实际的长期户外应用。我们提出的设计为蛋壳生物废弃物的环境友好型和可持续管理提供了一种新手段。
