{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"omics_type":["Unknown"],"volume":["13(5)"],"submitter":["Tsang YCA"],"pubmed_abstract":["This study explores the optical design of a daytime radiative cooler with near-ideal solar reflectance and longwave infrared (LWIR) emittance through materials selection and nanostructuring. Focusing on polymers as a materials platform, we introduce a bilayer architecture, comprising a porous poly(vinylidene fluoride-co-hexafluoropropene) (P(VdF-HFP)) topcoat that serves as a low-index LWIR emissive effective medium, over a nanofibrous, solar scattering polytetrafluoroethene underlayer. This novel configuration yields a superwhite coating with a near-ideal solar reflectance of >0.99, and a blackbody-like near-normal and hemispherical LWIR emittances of ∼0.98 and ∼0.96 respectively. Under humid and partially cloudy sky conditions unfavorable for radiative heat loss, these values enable the bilayer radiative cooler to achieve a sub-ambient of 2.3 °C. Given that the porous polymer bilayer uses scalable fabrication processes and commercially available materials, it holds significant promise for device-scale, as well as building thermoregulation applications."],"journal":["Nanophotonics (Berlin, Germany)"],"pagination":["669-677"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC11501546"],"repository":["biostudies-literature"],"pubmed_title":["Porous polymer bilayer with near-ideal solar reflectance and longwave infrared emittance."],"pmcid":["PMC11501546"],"pubmed_authors":["Varghese NJ","Mandal J","Tsang YCA","Degeorges M"],"additional_accession":[]},"is_claimable":false,"name":"Porous polymer bilayer with near-ideal solar reflectance and longwave infrared emittance.","description":"This study explores the optical design of a daytime radiative cooler with near-ideal solar reflectance and longwave infrared (LWIR) emittance through materials selection and nanostructuring. Focusing on polymers as a materials platform, we introduce a bilayer architecture, comprising a porous poly(vinylidene fluoride-co-hexafluoropropene) (P(VdF-HFP)) topcoat that serves as a low-index LWIR emissive effective medium, over a nanofibrous, solar scattering polytetrafluoroethene underlayer. This novel configuration yields a superwhite coating with a near-ideal solar reflectance of >0.99, and a blackbody-like near-normal and hemispherical LWIR emittances of ∼0.98 and ∼0.96 respectively. Under humid and partially cloudy sky conditions unfavorable for radiative heat loss, these values enable the bilayer radiative cooler to achieve a sub-ambient of 2.3 °C. Given that the porous polymer bilayer uses scalable fabrication processes and commercially available materials, it holds significant promise for device-scale, as well as building thermoregulation applications.","dates":{"release":"2024-01-01T00:00:00Z","publication":"2024 Mar","modification":"2025-04-18T12:54:37.188Z","creation":"2025-04-06T22:17:42.769Z"},"accession":"S-EPMC11501546","cross_references":{"pubmed":["39635091"],"doi":["10.1515/nanoph-2023-0707"]}}