Core-Shell structural SiO2@C microspheres enhanced thermal properties and electromagenetic wave absorption performance of PU phase-change composites for thermal management

Core-Shell structural SiO2@C microspheres enhanced thermal properties and electromagenetic wave absorption performance of PU phase-change composites for thermal management | 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 Research Article Core-Shell structural SiO 2 @C microspheres enhanced thermal properties and electromagenetic wave absorption performance of PU phase-change composites for thermal management Yongpeng Xia, Wenxin Zhang, Haoyue Huang, Hailiang Chu, Yongjin Zou, and 3 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8788205/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 Composite structures featuring low density, high thermal conductivity, and high mechanical strength have been developed to address the liquid leakage problem in organic phase change materials (PCMs) and to improve their thermal conductivity, thereby broadening their applications in thermal regulation and energy conversion. In this work, core-shell structured SiO 2 @C microspheres were synthesized via a sol-gel method and incorporated into polyurethane (PU) to form SiO 2 @C composite PCMs, with polyethylene glycol (PEG) encapsulated within the cross-linked PU network. The resulting composite demonstrates excellent phase-change behaviors, with melting and freezing enthalpies of 167.56 J/g and 166.67 J/g, respectively. Additionally, it exhibits a photothermal conversion efficiency of 90.43%. In terms of electromagnetic wave absorption, the PU/SiO 2 @C-2 composite achieves a minimum reflection loss of -20.06 dB at 16.64 GHz with a thickness of 7.76 mm, and an effective absorption bandwidth of 4.42 GHz. These results highlight its multifunctional integration of thermal energy storage and electromagnetic wave absorption properties. This design overcomes the single-function limitation of conventional PCMs, offering a multifunctional solution for compact electronic devices that combines efficient thermal management with broadband electromagnetic protection. Phase change materials Polyurethane Energy conversion Thermal energy SiO2@C microspheres Full Text Additional Declarations No competing interests reported. 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. 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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-8788205","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":610120467,"identity":"a22854aa-8bce-4c66-82e0-997a50fff373","order_by":0,"name":"Yongpeng 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