uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Pinning and wicking in regular pillar arrays
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
2014 (English)In: Soft Matter, ISSN 1744-683X, Vol. 10, no 31, 5739-5748 p.Article in journal (Refereed) Published
Abstract [en]

Pinning and wicking of a liquid meniscus in a square array of pillars is investigated in numerical energy minimizations and compared to wetting experiments. Our combined study shows that criteria for spontaneous film formation, based on thermodynamic considerations as well as on simple geometric modelling of the meniscus shape, are insufficient to predict the onset of wicking. High aspect ratio pillars with a square cross-section may display a re-entrant pinning regime as the density of the pillars is increased, a behaviour that is captured by neither of the aforementioned models. Numerically computed energy landscapes for the advancing meniscus allow us to explain the re-entrant behaviour in terms of energy barriers between topologically different meniscus shapes. Our numerical results are validated by wicking experiments where for the material contact angle theta(0) = 47 degrees the re-entrant behaviour is present for square pillars and absent for pillars with circular cross section.

Place, publisher, year, edition, pages
2014. Vol. 10, no 31, 5739-5748 p.
National Category
Physical Chemistry Engineering and Technology
Research subject
Engineering Science with specialization in Materials Science
URN: urn:nbn:se:uu:diva-232085DOI: 10.1039/c4sm00684dISI: 000340428700010OAI: oai:DiVA.org:uu-232085DiVA: diva2:746453
Available from: 2014-09-12 Created: 2014-09-12 Last updated: 2014-10-06Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Forsberg, Pontus
By organisation
Applied Materials Sciences
In the same journal
Soft Matter
Physical ChemistryEngineering and Technology

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 401 hits
ReferencesLink to record
Permanent link

Direct link