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Trapping of Water Drops by Line-Shaped Defects on Superhydrophobic Surfaces
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0001-8622-0386
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
2015. Vol. 31, no 23, 6367-6374 p.
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-171142DOI: 10.1021/acs.langmuir.5b01174ISI: 000356755300012PubMedID: 26010934Scopus ID: 2-s2.0-84935000794OAI: oai:DiVA.org:kth-171142DiVA: diva2:842443
Note

QC 20150720

Available from: 2015-07-20 Created: 2015-07-20 Last updated: 2017-12-04Bibliographically approved

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Wågberg, Lars

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