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This film demonstrates combined functions of radiative cooling and solar heating, suggesting enhanced thermal management in various conditions.
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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Wu et al. (2025) studied this question.
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