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Revealing How Topography of Surface Microstructures Alters Capillary Spreading
KTH, School of Engineering Sciences (SCI), Mechanics.
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2019 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, article id 7787Article in journal (Refereed) Published
Abstract [en]

Wetting phenomena, i.e. the spreading of a liquid over a dry solid surface, are important for understanding how plants and insects imbibe water and moisture and for miniaturization in chemistry and biotechnology, among other examples. They pose fundamental challenges and possibilities, especially in dynamic situations. The surface chemistry and micro-scale roughness may determine the macroscopic spreading flow. The question here is how dynamic wetting depends on the topography of the substrate, i.e. the actual geometry of the roughness elements. To this end, we have formulated a toy model that accounts for the roughness shape, which is tested against a series of spreading experiments made on asymmetric sawtooth surface structures. The spreading speed in different directions relative to the surface pattern is found to be well described by the toy model. The toy model also shows the mechanism by which the shape of the roughness together with the line friction determines the observed slowing down of the spreading.

Place, publisher, year, edition, pages
2019. Vol. 9, article id 7787
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
URN: urn:nbn:se:kth:diva-252970DOI: 10.1038/s41598-019-44243-xISI: 000468859400002PubMedID: 31127161Scopus ID: 2-s2.0-85066112839OAI: oai:DiVA.org:kth-252970DiVA, id: diva2:1341979
Note

QC 20190812

Available from: 2019-08-12 Created: 2019-08-12 Last updated: 2019-08-12Bibliographically approved

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Yada, SusumuAmberg, Gustav

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