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Rapid Commun."],"published-print":{"date-parts":[[2025,5]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Crystalline colloidal arrays (CCAs) composed of core\u2013shell microspheres with thermoresponsive structural iridescence governed by Bragg's law have garnered significant attention for diverse applications. While core\u2013shell microspheres with lower critical solution temperature (LCST) properties are extensively studied, upper critical solution temperature (UCST) counterparts remain unexplored, offering the potential to expand the application scope of thermoresponsive CCAs. In this study, poly(N\u2010acryloyl glycinamide) (PNAGA), a UCST homopolymer, is employed for the first time to synthesize core\u2013shell microspheres. By copolymerizing NAGA with the hydrophilic co\u2010monomer acrylamide (AM) to form the shell, microspheres with soft shells capable of assembling into CCAs with bright iridescence are obtained. Owing to Bragg's law and the UCST properties of the shell, the diffraction wavelength of these CCAs depends on concentration, observation angle, and temperature. The CCAs exhibit thermoresponsive behavior, with a size transition temperature around 14\u00b0C. Upon heating, the shells swell, and the microspheres transition from a rigid to a soft state, leading to an increase in interparticle distance and enhanced stabilization of the ordered microsphere packing. This process results in a red shift and a significant increase in the intensity of the diffraction peak. The thermoresponsive properties of these CCAs highlight their potential as intelligent temperature\u2010sensing materials.<\/jats:p>","DOI":"10.1002\/marc.202401077","type":"journal-article","created":{"date-parts":[[2025,1,30]],"date-time":"2025-01-30T06:01:53Z","timestamp":1738216913000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Color\u2010shifting Crystalline Colloidal Arrays from Polymers With Upper Critical Solution Temperature"],"prefix":"10.1002","volume":"46","author":[{"given":"Xinzhen","family":"Fan","sequence":"first","affiliation":[{"name":"School of Materials Science &amp; Chemical Engineering Key Laboratory of Impact and Safety Engineering Ministry of Education Ningbo University  Ningbo 315211 China"},{"name":"D\u00e9partement de Chimie Universit\u00e9 de Montr\u00e9al  Montr\u00e9al Qu\u00e9bec H2V0B3 Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mengqi","family":"Luo","sequence":"additional","affiliation":[{"name":"School of Materials Science &amp; Chemical Engineering Key Laboratory of Impact and Safety Engineering Ministry of Education Ningbo University  Ningbo 315211 China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yulin","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of New Energy Materials and Chemistry Leshan Normal University  Leshan 614000 China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"X. X.","family":"Zhu","sequence":"additional","affiliation":[{"name":"Department of Chemistry Beijing Normal University  Zhuhai 519085 China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5899-3143","authenticated-orcid":false,"given":"Chuanzhuang","family":"Zhao","sequence":"additional","affiliation":[{"name":"School of Materials Science &amp; Chemical Engineering Key Laboratory of Impact and Safety Engineering Ministry of Education Ningbo University  Ningbo 315211 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