{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,7]],"date-time":"2026-09-07T02:18:48Z","timestamp":1788747528207,"version":"build-2803163510"},"reference-count":69,"publisher":"Wiley","issue":"29","license":[{"start":{"date-parts":[[2017,6,5]],"date-time":"2017-06-05T00:00:00Z","timestamp":1496620800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/501100001321","name":"National Research Foundation","doi-asserted-by":"publisher","award":["NRF\u20102016R1E1A1A02921128"],"award-info":[{"award-number":["NRF\u20102016R1E1A1A02921128"]}],"id":[{"id":"10.13039\/501100001321","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Advanced Materials"],"published-print":{"date-parts":[[2017,8]]},"abstract":"<jats:p>Development of particles that change shape in response to external stimuli has been a long\u2010thought goal for producing bioinspired, smart materials. Herein, the temperature\u2010driven transformation of the shape and morphology of polymer particles composed of polystyrene\u2010<jats:italic>b<\/jats:italic>\u2010poly(4\u2010vinylpyridine) (PS\u2010<jats:italic>b<\/jats:italic>\u2010P4VP) block copolymers (BCPs) and temperature\u2010responsive poly(<jats:italic>N<\/jats:italic>\u2010isopropylacrylamide) (PNIPAM) surfactants is reported. PNIPAM acts as a temperature\u2010responsive surfactant with two important roles. First, PNIPAM stabilizes oil\u2010in\u2010water droplets as a P4VP\u2010selective surfactant, creating a nearly neutral interface between the PS and P4VP domains together with cetyltrimethylammonium bromide, a PS\u2010selective surfactant, to form anisotropic PS\u2010<jats:italic>b<\/jats:italic>\u2010P4VP particles (i.e., convex lenses and ellipsoids). More importantly, the temperature\u2010directed positioning of PNIPAM depending on its solubility determines the overall particle shape. Ellipsoidal particles are produced above the critical temperature, whereas convex lens\u2010shaped particles are obtained below the critical temperature. Interestingly, given that the temperature at which particle shape change occurs depends solely on the lower critical solution temperature (LCST) of the polymer surfactants, facile tuning of the transition temperature is realized by employing other PNIPAM derivatives with different LCSTs. Furthermore, reversible transformations between different shapes of PS\u2010<jats:italic>b<\/jats:italic>\u2010P4VP particles are successfully demonstrated using a solvent\u2010adsorption annealing with chloroform, suggesting great promise of these particles for sensing, smart coating, and drug delivery applications.<\/jats:p>","DOI":"10.1002\/adma.201700608","type":"journal-article","created":{"date-parts":[[2017,6,5]],"date-time":"2017-06-05T14:12:50Z","timestamp":1496671970000},"source":"Crossref","is-referenced-by-count":92,"title":["Stimuli\u2010Responsive, Shape\u2010Transforming Nanostructured Particles"],"prefix":"10.1002","volume":"29","author":[{"given":"Junhyuk","family":"Lee","sequence":"first","affiliation":[{"name":"Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology (KAIST)  Daejeon 34141 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kang 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