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Updated: Sep 11, 2025

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector
Published on: October 18, 2017
A dual-mode self-cleaning film for durable passive radiative cooling and solar heating
Tingni Wu1, Kai Yin1,2,3, Yuchun He1
1Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, Changsha 410083, China. kaiyin@csu.edu.cn.
Abstract:
Solar heating and radiative cooling offer sustainable pathways to address fossil energy demand. However, their single-mode operation and susceptibility to contamination restrict performance under varying daily and seasonal conditions. Herein, a superhydrophobic dual-mode thermal management film with combined cooling and heating features was developed. The cooling side (CS) exhibits high visible light reflectance (87%) and high infrared emissivity (95%), allowing a cooling effect of about 5.9 °C under 72 mW cm-2. Furthermore, the heating side (HS) generates coral-like black micro-nanostructures on the polyimide tape surface by a femtosecond laser one-step approach. It has exceptionally high solar absorption (98%) and can yield a temperature rise of about 40 °C at one-sun intensity. In addition, the material possesses excellent superhydrophobicity and chemical stability over a wide pH range. It exhibits favorable self-cleaning performance with a contact angle of more than 155°. This thermal management film holds significant application potential in building energy efficient devices, giving new insights for realizing passive temperature regulation.
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