UV-cured coatings for highly efficient passive all-day radiative cooling

UV-cured coatings for highly efficient passive all-day radiative cooling | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article UV-cured coatings for highly efficient passive all-day radiative cooling Heng Luo, Meng Yang, Jing Guo, Weizhi Zou, Jian Xu, Ning Zhao This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-1280366/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Passive radiative cooling provides a promising way to reduce energy consumption for cooling. However, it always requires stringent materials designs or manipulations, which are neither cost-effective nor widely adaptable. Here, we report a fast, inexpensive, and scalable UV-curing method to fabricate porous polymer coatings via photopolymerization-induced phase separation. This coating with hierarchical pore structure, has a superior long-wave infrared emittance of 0.98 and strong solar reflectance of 0.96, resulting in sub-ambient temperature drops of ~9.8°C during the night and ~5.7°C under solar intensity of ~960 W m −2 in the metropolitan area in summer. Moreover, the UV-cured coating is highly crosslinked and superhydrophobic without any treatment, showing excellent durability after long-term UV irradiation, thermal aging, or immersion in corrosive chemicals. The paint-like simplicity and remarkable weather resistance are vital for promoting practical applications of cooling coatings. Hierarchical pores intrinsic emitter photopolymerization phase separation sub-ambient cooling Full Text Additional Declarations There is NO Competing Interest. Supplementary Files SupplementaryInformation.docx Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-1280366","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":80756181,"identity":"0f4d6c8d-74b8-43f4-8f61-117511d2bc28","order_by":0,"name":"Heng Luo","email":"","orcid":"","institution":"Institute of Chemistry","correspondingAuthor":false,"submittingAuthor":false,"prefix":"","firstName":"Heng","middleName":"","lastName":"Luo","suffix":""},{"id":80756182,"identity":"3907d4cc-6695-42ca-82ef-54b13abcb405","order_by":1,"name":"Meng Yang","email":"","orcid":"","institution":"Institute of Chemistry, Chinese Academy of 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However, it always requires stringent materials designs or manipulations, which are neither cost-effective nor widely adaptable. Here, we report a fast, inexpensive, and scalable UV-curing method to fabricate porous polymer coatings via photopolymerization-induced phase separation. This coating with hierarchical pore structure, has a superior long-wave infrared emittance of 0.98 and strong solar reflectance of 0.96, resulting in sub-ambient temperature drops of ~9.8\u0026deg;C during the night and ~5.7\u0026deg;C under solar intensity of ~960 W m\u003csup\u003e\u0026minus;2\u003c/sup\u003e in the metropolitan area in summer. Moreover, the UV-cured coating is highly crosslinked and superhydrophobic without any treatment, showing excellent durability after long-term UV irradiation, thermal aging, or immersion in corrosive chemicals. 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