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Soft Matter Vol - 9 Issue - 9

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Soft Matter Vol - 9 Issue - 6

Soft Matter Vol - 9 Issue - 5

Dielectrophoretic deformation of thin liquid films induced by surface charge patterns on dielectric substrates

Content Provider	Royal Society of Chemistry (RSC)
Author	Zeegers, J. C. H. Kuijpers, C. J. Darhuber, A. A. Berendsen, C. W. J.
Copyright Year	2013
Abstract	We studied the deformation of thin liquid films induced by surface charge patterns at the solid–liquid interface quantitatively by experiments and numerical simulations. We deposited a surface charge distribution on dielectric substrates by applying potential differences between a conductive liquid droplet and a grounded metal plate underneath the substrate that was moved in a pre-defined trajectory. Subsequently, we coated a thin liquid film on the substrate and measured the film thickness profile as a function of time by interference microscopy. We developed a numerical model based on the lubrication approximation and an electrohydrodynamic model for a perfect dielectric liquid. We compared experiments and simulations of the film deformation as a function of time for different charge distributions and a good agreement was obtained. Furthermore, we investigated the influence of the width of the surface charge distribution and the initial film thickness on the dielectrophoretic deformation of the liquid film. We performed a scaling analysis of the experimental and numerical results and derived a self-similar solution describing the dynamics in the case of narrow charge distributions.
Starting Page	4900
Ending Page	4910
Page Count	11
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	9
Issue Number	19
Journal	Soft Matter
DOI	10.1039/c3sm27944h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Microscopy Dielectric Electrohydrodynamics Self-similarity
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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