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Trapping of Water Drops by Line-Shaped Defects on Superhydrophobic Surfaces
KTH Royal Institute Technology, Sweden.
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-1503-8293
KTH Royal Institute Technology, Sweden; KTH Royal Institute Technology, Sweden.
2015 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 31, no 23, 6367-6374 p.Article in journal (Refereed) Published
Abstract [en]

We have investigated the effect of line-shaped topographical defects on the motion of water drops across superhydrophobic wax surfaces using a high-speed video camera. The defects are introduced onto the superhydrophobic wax surfaces by a scratching procedure. It is demonstrated that the motion of a drop interacting with the defect can be approximated by a damped harmonic oscillator. Whether a drop passes or gets trapped by the defect is determined by the incident speed and the properties of the oscillator, specifically by the damping ratio and a nondimensional forcing constant representing the effects of gravity and pinning forces. We also show that it is possible to predict a critical trapping speed as well as an exit speed in systems with negligible viscous dissipation using a simple work energy consideration.

Place, publisher, year, edition, pages
American Chemical Society , 2015. Vol. 31, no 23, 6367-6374 p.
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-120230DOI: 10.1021/acs.langmuir.5b01174ISI: 000356755300012PubMedID: 26010934OAI: oai:DiVA.org:liu-120230DiVA: diva2:842636
Note

Funding Agencies|Swedish Foundation for Strategic Research (SSF) [2005:0073/13, RMA08-0044]

Available from: 2015-07-21 Created: 2015-07-20 Last updated: 2016-05-04

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Lindström, Stefan
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