Pancake bouncing on superhydrophobic surfaces

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

397 Scopus Citations
View graph of relations

Author(s)

  • Yahua Liu
  • Lisa Moevius
  • Xinpeng Xu
  • Tiezheng Qian
  • Julia M. Yeomans

Detail(s)

Original languageEnglish
Pages (from-to)515-519
Journal / PublicationNature Physics
Volume10
Issue number7
Online published8 Jun 2014
Publication statusPublished - Jul 2014

Abstract

Engineering surfaces that promote rapid drop detachment is of importance to a wide range of applications including anti-icing, dropwise condensation and self-cleaning. Here we show how superhydrophobic surfaces patterned with lattices of submillimetre-scale posts decorated with nanotextures can generate a counter-intuitive bouncing regime: drops spread on impact and then leave the surface in a flattened, pancake shape without retracting. This allows a fourfold reduction in contact time compared with conventional complete rebound. We demonstrate that the pancake bouncing results from the rectification of capillary energy stored in the penetrated liquid into upward motion adequate to lift the drop. Moreover, the timescales for lateral drop spreading over the surface and for vertical motion must be comparable. In particular, by designing surfaces with tapered micro/nanotextures that behave as harmonic springs, the timescales become independent of the impact velocity, allowing the occurrence of pancake bouncing and rapid drop detachment over a wide range of impact velocities.

Citation Format(s)

Pancake bouncing on superhydrophobic surfaces. / Liu, Yahua; Moevius, Lisa; Xu, Xinpeng; Qian, Tiezheng; Yeomans, Julia M.; Wang, Zuankai.

In: Nature Physics, Vol. 10, No. 7, 07.2014, p. 515-519.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review