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Rapid Commun"],"published-print":{"date-parts":[[2013,10]]},"abstract":"<jats:p>The excellent properties of elastomers are exploited to trigger wrinkling instabilities in curved shells. Micro\u2010 and nano\u2010fibres are produced by electrospinning and UV irradiated: each fibre consists of a soft core and a stiff outer half\u2010shell. Upon solvent de\u2010swelling, the fibres curl because the shell and the core have different natural lengths. Wrinkling only starts after the fibre has attained a well\u2010defined helical shape. A simple analytical model is proposed to find the curling curvature and wrinkle wavelength, as well as the transition between the \u201ccurling\u201d and \u201cwrinkling\u201d regimes. This new instability resembles that found in the tendrils of climbing plants as they dry and lignify.\n<jats:boxed-text content-type=\"graphic\" position=\"anchor\"><jats:graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" mimetype=\"image\/jpg\" position=\"anchor\" specific-use=\"enlarged-web-image\" xlink:href=\"graphic\/marc201300436-abs-0001-m.jpg\"><jats:alt-text>image<\/jats:alt-text><\/jats:graphic><\/jats:boxed-text><\/jats:p>","DOI":"10.1002\/marc.201300436","type":"journal-article","created":{"date-parts":[[2013,8,19]],"date-time":"2013-08-19T20:52:41Z","timestamp":1376945561000},"page":"1618-1622","source":"Crossref","is-referenced-by-count":23,"title":["First Curl, Then Wrinkle"],"prefix":"10.1002","volume":"34","author":[{"given":"Ana C.","family":"Trindade","sequence":"first","affiliation":[{"name":"Departamento de Ci\u00eancia dos Materiais and CENIMAT\/I3N, Faculdade de Ci\u00eancias e Tecnologia Universidade Nova de Lisboa  2829\u2013516 Caparica Portugal"}]},{"given":"Jo\u00e3o P.","family":"Canejo","sequence":"additional","affiliation":[{"name":"Departamento de Ci\u00eancia dos Materiais and CENIMAT\/I3N, Faculdade de Ci\u00eancias e Tecnologia Universidade Nova de Lisboa  2829\u2013516 Caparica Portugal"}]},{"given":"Paulo I. 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