A viscous switch for liquid-liquid dewetting

A. M. J. Edwards, R. Ledesma-Aguilar, M. I. Newton, C. V. Brown, G. McHale

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The spontaneous dewetting of a liquid film from a solid surface occurs in many important processes, such as printing and microscale patterning. Experience suggests that dewetting occurs faster on surfaces of higher film repellency. Here, we show how, unexpectedly, a surrounding viscous phase can switch the overall dewetting speed so that films retract slower with increasing surface repellency. We present experiments and a hydrodynamic theory covering five decades of the viscosity ratio between the film and the surrounding phase. The timescale of dewetting is controlled by the geometry of the liquid-liquid interface close to the contact line and the viscosity ratio. At small viscosity ratio, dewetting is slower on low film-repellency surfaces due to a high dissipation at the edge of the receding film. This situation is reversed at high viscosity ratios, leading to a slower dewetting on high film-repellency surfaces due to the increased dissipation of the advancing surrounding phase.
Original languageEnglish
Article number21
JournalCommunications Physics
Issue number1
Publication statusPublished - 23 Jan 2020

Keywords / Materials (for Non-textual outputs)

  • Fluid dynamics
  • Wetting


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