Transient surface patterns during adhesion and coalescence of thin liquid films

Soft Matter
Hongbo ZengJacob N Israelachvili

Abstract

Surface deformations during the coalescence of two polymer melt films were studied by use of a surface forces apparatus (SFA). Well-ordered periodic surface ripple/finger patterns were observed during the adhesion and coalescence, which eventually disappeared, leaving smooth polymer-air interfaces. The life-times of these transient well-ordered patterns depend on the viscosity and film thickness of the polymer melts. These observations are in contrast to the conventional understanding that liquid-liquid coalescence usually occurs with the deforming surfaces remaining smoothly curved at all stages, with no esoteric shape-transitions. The results reveal a new feature associated with liquid-liquid adhesion/coalescence, which may be of key importance for a full understanding of coalescence processes. We propose an explanation for the observed phenomenon in terms of simple physical concepts, and discuss other microscopic and macroscopic (including biological) systems where similar effects are likely to occur.

References

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Citations

Nov 23, 2012·Journal of the Royal Society, Interface·Qingye LuDong Soo Hwang
Sep 17, 2015·The Journal of Chemical Physics·Gutian ZhaoYunfei Chen
Jun 11, 2010·Proceedings of the National Academy of Sciences of the United States of America·Ivan U VakarelskiDerek Y C Chan
Nov 3, 2020·Soft Matter·Sarath Chandra VarmaSuman Chakraborty
Apr 7, 2010·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Jhoan Toro-MendozaGerman Urbina-Villalba
Apr 29, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Hongbo ZengJacob Israelachvili
Jun 16, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Hongbo ZengJacob N Israelachvili
Sep 11, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Ali Faghihnejad, Hongbo Zeng
Aug 23, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Lu GongHongbo Zeng

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