A flexible and superhydrophobic PTFE/PU-SiO2 complex coating with synergistic effect for enhancement of passive daytime radiative cooling

IF 6.5 2区材料科学 Q1 CHEMISTRY, APPLIED Progress in Organic Coatings Pub Date : 2025-02-12 DOI:10.1016/j.porgcoat.2025.109145

Yanhua Su , Jianyang Shi , Shuang Wang , Haibo Wang , Zongliang Du , Jinghong Qiu , Xu Cheng

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Abstract

Passive radiative cooling (PRC) is a novel form of cooling with zero pollution and zero energy consumption, which cools objects by reflecting sunlight and radiating heat to cold outer space. In this study, PTFE as the functional filler, PU as binder, SiO₂ with high infrared emissivity as the end agent in the PU, MEK and DMF as solvents were used to prepare microporous radiative cooling films. PTFE powder enhances the films' solar rflectivity, hydrophobic properties, and UV aging resistance. Using MEK and DMF as solvents eliminates the requirement for a complicated preparation procedure, and the direct drying approach may be used to create the porous coating films. When the average solar irradiance is 860 W/m², the average temperature of the films decreases by 16.4 °C, and the average radiative cooling power reaches 130 W/m². These films also demonstrate excellent hydrophobicity with a water contact angle of 134°. Notably, they retain their cooling efficiency and hydrophobic properties after 200 h of ultraviolet exposure, show amazing environmental durability and ensuring a sustained daytime radiative cooling effect.

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来源期刊

Progress in Organic Coatings 工程技术-材料科学：膜

CiteScore

11.40

自引率

15.20%

发文量

577

审稿时长

48 days

期刊介绍： The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as: • Chemical, physical and technological properties of organic coatings and related materials • Problems and methods of preparation, manufacture and application of these materials • Performance, testing and analysis.