Hydrodynamic Elastocapillary Morphing of Hair Bundles

Jonghyun Ha, Yun Seong Kim, Kaiying Jiang, Ryan Siu, Sameh Tawfick

Research output: Contribution to journalArticlepeer-review


We report polymorphic self-assembly of hair arranged in hollow bundles driven by capillarity, hydrodynamics, and elasticity. Bundles emerging from a liquid bath shrink but remain hollow at slow drainage due to the negative pressure of the menisci trapped between the hairs. The timescale allows the collective stiffening of the fibers to resist closure. At fast drainage, the bundles fully close before the liquid can drain through the hair. A liquid column trapped in the hole closes the bundle while the lubricated hairs still behave softly. Scaling laws predict this reversible hair polymorphism.

Original languageEnglish (US)
Article number254503
Pages (from-to)254503
JournalPhysical review letters
Issue number25
StatePublished - Dec 16 2020

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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