A viscous switch for liquid-liquid dewetting

Andrew M. Edwards, Rodrigo Ledesma Aguilar, Michael I. Newton, C. V. Brown, Glen McHale

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
17 Downloads (Pure)

Abstract

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
Volume3
Issue number1
Early online date23 Jan 2020
DOIs
Publication statusPublished - 1 Dec 2020

Fingerprint

Dive into the research topics of 'A viscous switch for liquid-liquid dewetting'. Together they form a unique fingerprint.

Cite this