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Interfaces 2021, 13, 18, 21733-21739 RETURN TO ISSUEPREVApplications of Poly...Applications of Polymer, Composite, and Coating MaterialsNEXT Journal Logo Ultrawhite BaSO[4] Paints and Films for Remarkable Daytime Subambient Radiative Cooling * Xiangyu Li Xiangyu Li School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907, United States Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States More by Xiangyu Li Orcidhttp://orcid.org/0000-0003-0116-7307 , * Joseph Peoples Joseph Peoples School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907, United States Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States More by Joseph Peoples Orcidhttp://orcid.org/0000-0002-0495-1394 , * Peiyan Yao Peiyan Yao School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907, United States Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States More by Peiyan Yao , and * Xiulin Ruan* Xiulin Ruan School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907, United States Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States *Email: [email protected] More by Xiulin Ruan Orcidhttp://orcid.org/0000-0001-7611-7449 Cite this: ACS Appl. Mater. Interfaces 2021, 13, 18, 21733-21739 Publication Date (Web):April 15, 2021 Publication History * Received3 February 2021 * Accepted22 March 2021 * Published online15 April 2021 * Published inissue 12 May 2021 https://doi.org/10.1021/acsami.1c02368 Copyright (c) 2021 American Chemical Society RIGHTS & PERMISSIONS Article Views 4366 Altmetric - Citations 2 LEARN ABOUT THESE METRICS Article Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days. Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts. The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView In * Add Full Text with Reference * Add Description ExportRIS * Citation * Citation and abstract * Citation and references * More Options Share on * Facebook * Twitter * Wechat * Linked In * Reddit Read OnlinePDF (3 MB) Get e-Alerts Supporting Info (2)>>Supporting Information Supporting Information SUBJECTS: * Thickness, * Nanoparticles, * Particle size, * Optical properties, * Power Go to ACS Applied Materials & Interfaces Get e-Alerts Abstract Abstract Image Radiative cooling is a passive cooling technology that offers great promises to reduce space cooling cost, combat the urban island effect, and alleviate the global warming. To achieve passive daytime radiative cooling, current state-of-the-art solutions often utilize complicated multilayer structures or a reflective metal layer, limiting their applications in many fields. Attempts have been made to achieve passive daytime radiative cooling with single-layer paints, but they often require a thick coating or show partial daytime cooling. In this work, we experimentally demonstrate remarkable full-daytime subambient cooling performance with both BaSO [4] nanoparticle films and BaSO[4] nanocomposite paints. BaSO[4] has a high electron band gap for low solar absorptance and phonon resonance at 9 mm for high sky window emissivity. With an appropriate particle size and a broad particle size distribution, the BaSO[4] nanoparticle film reaches an ultrahigh solar reflectance of 97.6% and a high sky window emissivity of 0.96. During field tests, the BaSO[4] film stays more than 4.5 degC below ambient temperature or achieves an average cooling power of 117 W/m^2. The BaSO[4]-acrylic paint is developed with a 60% volume concentration to enhance the reliability in outdoor applications, achieving a solar reflectance of 98.1% and a sky window emissivity of 0.95. Field tests indicate similar cooling performance to the BaSO[4] films. Overall, our BaSO[4]-acrylic paint shows a standard figure of merit of 0.77, which is among the highest of radiative cooling solutions while providing great reliability, convenient paint form, ease of use, and compatibility with the commercial paint fabrication process. KEYWORDS: * daytime radiative cooling * atmospheric sky window * particle-matrix paint * figure of merit Supporting Information ARTICLE SECTIONS Jump To --------------------------------------------------------------------- The Supporting Information is available free of charge at https:// pubs.acs.org/doi/10.1021/acsami.1c02368. * Substrate dependence of the BaSO[4] film samples (Note 1); energy balance model for the cooling power characterization (Note 2); cost analysis of the cooling paint (Note 3); the effect of substrate on the subambient sample temperature of the BaSO[4] film (Figure S1); the theoretical cooling power compared with experimental measurements of the BaSO[4] film and BaSO[4] paint (Figure S2) (PDF) * Brushing, drying, and water running test of the BaSO4 paint (Video S1) (MP4) * am1c02368_si_001.pdf (704.09 kb) * am1c02368_si_002.mp4 (5.87 MB) Terms & Conditions Most electronic Supporting Information files are available without a subscription to ACS Web Editions. Such files may be downloaded by article for research use (if there is a public use license linked to the relevant article, that license may permit other uses). Permission may be obtained from ACS for other uses through requests via the RightsLink permission system: http://pubs.acs.org/page/copyright/ permissions.html. Cited By --------------------------------------------------------------------- This article is cited by 2 publications. 1. Weilong Jing, Shuai Zhang, Wei Zhang, Zhang Chen, Canying Zhang, Daxiong Wu, Yanfeng Gao, Haitao Zhu. Scalable and Flexible Electrospun Film for Daytime Subambient Radiative Cooling. ACS Applied Materials & Interfaces 2021, 13 (25) , 29558-29566. https://doi.org/10.1021/acsami.1c05364 2. Lu An, Donald Petit, Massimigliano Di Luigi, Aaron Sheng, Yulong Huang, Yong Hu, Zheng Li, Shenqiang Ren. Reflective Paint Consisting of Mesoporous Silica Aerogel and Titania Nanoparticles for Thermal Management. ACS Applied Nano Materials 2021, 4 (6) , 6357-6363. https://doi.org/10.1021/acsanm.1c01280 Partners Atypon Chorus Cope publication ethics Project Counter Crossref Crossref similarity check Orcid Connecting Research and Researchers Portico digital preservation service ACS Publications * 1155 Sixteenth Street N.W. * Washington, DC 20036 * Copyright (c) 2021 American Chemical Society About * About ACS Publications * ACS & Open Access * ACS Membership Resources and Information * Journals A-Z * Books and Reference * Advertising Media Kit * Institutional Sales * ACS Publishing Center * Privacy Policy * Terms of Use Support & Contact * Help * Live Chat * FAQ Connect with ACS Publications * * * * * Pair your accounts. Export articles to Mendeley Get article recommendations from ACS based on references in your Mendeley library. Pair your accounts. Export articles to Mendeley Get article recommendations from ACS based on references in your Mendeley library. 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