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231224s2016 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.6b03010
|2 doi
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|a eng
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|a Brabcova, Zuzana
|e verfasserin
|4 aut
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|a Near Axisymmetric Partial Wetting Using Interface-Localized Liquid Dielectrophoresis
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|c 2016
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|a Text
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 07.06.2018
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|a Date Revised 07.06.2018
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a The wetting of solid surfaces can be modified by altering the surface free energy balance between the solid, liquid, and vapor phases. Liquid dielectrophoresis (L-DEP) can produce wetting on normally nonwetting surfaces, without modification of the surface topography or chemistry. L-DEP is a bulk force acting on the dipoles of a dielectric liquid and is not normally considered to be a localized effect acting at the interface between the liquid and a solid or other fluid. However, if this force is induced by a nonuniform electric field across a solid-liquid interface, it can be used to enhance and control the wetting of a dielectric liquid. Recently, it was reported theoretically and experimentally that this approach can cause a droplet of oil to spread along parallel interdigitated electrodes thus forming a stripe of liquid. Here we show that by using spiral-shaped electrodes actuated with four 90° successive phase-shifted signals, a near axisymmetric spreading of droplets can be achieved. Experimental observations show that the induced wetting can achieve film formation, an effect not possible with electrowetting. We show that the spreading is reversible thus enabling a wide range of partial wetting droplet states to be achieved in a controllable manner. Furthermore, we find that the cosine of the contact angle has a quadratic dependence on applied voltage during spreading and deduce a scaling law for the dependence of the strength of the effect on the electrode size
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a McHale, Glen
|e verfasserin
|4 aut
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|a Wells, Gary G
|e verfasserin
|4 aut
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|a Brown, Carl V
|e verfasserin
|4 aut
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|a Newton, Michael I
|e verfasserin
|4 aut
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|a Edwards, Andrew M J
|e verfasserin
|4 aut
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 32(2016), 42 vom: 25. Okt., Seite 10844-10850
|w (DE-627)NLM098181009
|x 1520-5827
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|g volume:32
|g year:2016
|g number:42
|g day:25
|g month:10
|g pages:10844-10850
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|u http://dx.doi.org/10.1021/acs.langmuir.6b03010
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