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Article: Droplet-based electro-coalescence for probing threshold disjoining pressure

TitleDroplet-based electro-coalescence for probing threshold disjoining pressure
Authors
Issue Date2015
PublisherRoyal Society of Chemistry. The Journal's web site is located at http://www.rsc.org/loc
Citation
Lab on a Chip, 2015, v. 15 n. 9, p. 2018-2024 How to Cite?
AbstractIn this work, we investigate the coalescence of emulsion droplets in a controlled electric field. Two contacting droplets stabilized by surfactants can be forced to coalesce into a combined one when the applied voltage is above a critical value. The critical voltages change with the types, concentrations of surfactants and temperature. By exploring the drainage of a thin oil film trapped between emulsions, we interpret that the coalescence occurs as the electric compression overcomes the disjoining pressure barrier and squeezes the film to a critical thickness. Based on this, we have devised an approach to probe the threshold disjoining pressure which can help predict the emulsion stability and surfactant efficacy quantitatively. We have confirmed the validity of our approach for measuring the threshold disjoining pressure by comparing the result with other proven tests that involve centrifugation and thermal heating. Our approach is simple, reliable and robust in predicting emulsion stability and will facilitate the design of emulsion-based formulations by accelerating the testing of emulsion stability.
Persistent Identifierhttp://hdl.handle.net/10722/216946
ISSN
2015 Impact Factor: 5.586
2015 SCImago Journal Rankings: 2.373

 

DC FieldValueLanguage
dc.contributor.authorLiu, Z-
dc.contributor.authorChan, ST-
dc.contributor.authorFaizi, HA-
dc.contributor.authorRoberts, RC-
dc.contributor.authorShum, HC-
dc.date.accessioned2015-09-18T05:43:46Z-
dc.date.available2015-09-18T05:43:46Z-
dc.date.issued2015-
dc.identifier.citationLab on a Chip, 2015, v. 15 n. 9, p. 2018-2024-
dc.identifier.issn1473-0197-
dc.identifier.urihttp://hdl.handle.net/10722/216946-
dc.description.abstractIn this work, we investigate the coalescence of emulsion droplets in a controlled electric field. Two contacting droplets stabilized by surfactants can be forced to coalesce into a combined one when the applied voltage is above a critical value. The critical voltages change with the types, concentrations of surfactants and temperature. By exploring the drainage of a thin oil film trapped between emulsions, we interpret that the coalescence occurs as the electric compression overcomes the disjoining pressure barrier and squeezes the film to a critical thickness. Based on this, we have devised an approach to probe the threshold disjoining pressure which can help predict the emulsion stability and surfactant efficacy quantitatively. We have confirmed the validity of our approach for measuring the threshold disjoining pressure by comparing the result with other proven tests that involve centrifugation and thermal heating. Our approach is simple, reliable and robust in predicting emulsion stability and will facilitate the design of emulsion-based formulations by accelerating the testing of emulsion stability.-
dc.languageeng-
dc.publisherRoyal Society of Chemistry. The Journal's web site is located at http://www.rsc.org/loc-
dc.relation.ispartofLab on a Chip-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleDroplet-based electro-coalescence for probing threshold disjoining pressure-
dc.typeArticle-
dc.identifier.emailChan, ST: santo719@hku.hk-
dc.identifier.emailRoberts, RC: rcr8@hku.hk-
dc.identifier.emailShum, HC: ashum@hku.hk-
dc.identifier.authorityRoberts, RC=rp01738-
dc.identifier.authorityShum, HC=rp01439-
dc.description.naturepostprint-
dc.identifier.doi10.1039/c5lc00177c-
dc.identifier.hkuros250687-
dc.identifier.volume15-
dc.identifier.issue9-
dc.identifier.spage2018-
dc.identifier.epage2024-
dc.publisher.placeUnited Kingdom-

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