First Curl, Then Wrinkle

Ana C. Trindade, João Paulo Heitor Godinho Canejo, Paulo I. C. Teixeira, Maria Helena Figueiredo Godinho, Pedro Patricio

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


The excellent properties of elastomers are exploited to trigger wrinkling instabilities in curved shells. Micro- and nano-fibres are produced by electrospinning and UV irradiated: each fibre consists of a soft core and a stiff outer half-shell. Upon solvent de-swelling, the fibres curl because the shell and the core have different natural lengths. Wrinkling only starts after the fibre has attained a well-defined helical shape. A simple analytical model is proposed to find the curling curvature and wrinkle wavelength, as well as the transition between the curling and wrinkling regimes. This new instability resembles that found in the tendrils of climbing plants as they dry and lignify.
Original languageEnglish
Pages (from-to)1618-1622
JournalMacromolecular Rapid Communications
Issue number20
Publication statusPublished - 2013


  • elastic instabilities
  • elastomers
  • electrospinning
  • Janus fibres

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