Self-spreading of the wetting ridge during stick-slip on a viscoelastic surface
SCIE
SCOPUS
- Title
- Self-spreading of the wetting ridge during stick-slip on a viscoelastic surface
- Authors
- Park, S. J.; Bostwick, J. B.; De Andrade, V.; Je, J. H.
- Date Issued
- 2017-11
- Publisher
- Royal Society of Chemistry
- Abstract
- Dynamic wetting behaviors on soft solids are important to interpret complex biological processes from cell-substrate interactions. Despite intensive research studies over the past half-century, the underlying mechanisms of spreading behaviors are not clearly understood. The most interesting feature of wetting on soft matter is the formation of a "wetting ridge'', a surface deformation by a competition between elasticity and capillarity. Dynamics of the wetting ridge formed at the three-phase contact line underlies the dynamic wetting behaviors, but remains largely unexplored mostly due to limitations in indirect observation. Here, we directly visualize wetting ridge dynamics during continuous-and stick-slip motions on a viscoelastic surface using X-ray microscopy. Strikingly, we discover that the ridge spreads spontaneously during stick and triggers contact line depinning (stick-to-slip transition) by changing the ridge geometry which weakens the contact line pinning. Finally, we clarify 'viscoelastic-braking', 'stick-slipping', and 'stick-breaking' spreading behaviors through the ridge dynamics. In stick-breaking, no ridge-spreading occurs and contact line pinning (hysteresis) is enhanced by cusp-bending while preserving a microscopic equilibrium at the ridge tip. We have furthered the understanding of spreading behaviors on soft solids and demonstrated the value of X-ray microscopy in elucidating various dynamic wetting behaviors on soft solids as well as puzzling biological issues.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/91984
- DOI
- 10.1039/c7sm01408b
- ISSN
- 1744-683X
- Article Type
- Article
- Citation
- Soft Matter, vol. 13, no. 44, page. 8331 - 8336, 2017-11
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