Stabilization of thin liquid films by repulsive van der waals force

Handle URI:
http://hdl.handle.net/10754/563545
Title:
Stabilization of thin liquid films by repulsive van der waals force
Authors:
Li, Erqiang ( 0000-0002-5003-0756 ) ; Vakarelski, Ivan Uriev ( 0000-0001-9244-9160 ) ; Chan, Derek Y C; Thoroddsen, Sigurdur T. ( 0000-0001-6997-4311 )
Abstract:
Using high-speed video recording of bubble rise experiments, we study the stability of thin liquid films trapped between a rising bubble and a surfactant-free liquid-liquid meniscus interface. Using different combinations of nonpolar oils and water that are all immiscible, we investigate the extent to which film stability can be predicted by attractive and repulsive van der Waals (vdW) interactions that are indicated by the relative magnitude of the refractive indices of the liquid combinations, for example, water (refractive index, n = 1.33), perfluorohexane (n = 1.23), and tetradecane (n = 1.43). We show that, when the film-forming phase was oil (perfluorohexane or tetradecane), the stability of the film could always be predicted from the sign of the vdW interaction, with a repulsive vdW force resulting in a stable film and an attractive vdW force resulting in film rupture. However, if aqueous electrolyte is the film-forming bulk phase between the rising air bubble and the upper oil phase, the film always ruptured, even when a repulsive vdW interaction was predicted. We interpret these results as supporting the hypothesis that a short-ranged hydrophobic attraction determines the stability of the thin water film formed between an air phase and a nonpolar oil phase. © 2014 American Chemical Society.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; High-Speed Fluids Imaging Laboratory
Publisher:
American Chemical Society (ACS)
Journal:
Langmuir
Issue Date:
13-May-2014
DOI:
10.1021/la500868y
Type:
Article
ISSN:
07437463
Sponsors:
E.Q.L. is grateful for a SABIC Postdoctoral Fellowship. This work is supported in part by an Australian Research Council Discovery Project Grant to D.Y.C.C.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorLi, Erqiangen
dc.contributor.authorVakarelski, Ivan Urieven
dc.contributor.authorChan, Derek Y Cen
dc.contributor.authorThoroddsen, Sigurdur T.en
dc.date.accessioned2015-08-03T11:54:07Zen
dc.date.available2015-08-03T11:54:07Zen
dc.date.issued2014-05-13en
dc.identifier.issn07437463en
dc.identifier.doi10.1021/la500868yen
dc.identifier.urihttp://hdl.handle.net/10754/563545en
dc.description.abstractUsing high-speed video recording of bubble rise experiments, we study the stability of thin liquid films trapped between a rising bubble and a surfactant-free liquid-liquid meniscus interface. Using different combinations of nonpolar oils and water that are all immiscible, we investigate the extent to which film stability can be predicted by attractive and repulsive van der Waals (vdW) interactions that are indicated by the relative magnitude of the refractive indices of the liquid combinations, for example, water (refractive index, n = 1.33), perfluorohexane (n = 1.23), and tetradecane (n = 1.43). We show that, when the film-forming phase was oil (perfluorohexane or tetradecane), the stability of the film could always be predicted from the sign of the vdW interaction, with a repulsive vdW force resulting in a stable film and an attractive vdW force resulting in film rupture. However, if aqueous electrolyte is the film-forming bulk phase between the rising air bubble and the upper oil phase, the film always ruptured, even when a repulsive vdW interaction was predicted. We interpret these results as supporting the hypothesis that a short-ranged hydrophobic attraction determines the stability of the thin water film formed between an air phase and a nonpolar oil phase. © 2014 American Chemical Society.en
dc.description.sponsorshipE.Q.L. is grateful for a SABIC Postdoctoral Fellowship. This work is supported in part by an Australian Research Council Discovery Project Grant to D.Y.C.C.en
dc.publisherAmerican Chemical Society (ACS)en
dc.titleStabilization of thin liquid films by repulsive van der waals forceen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMechanical Engineering Programen
dc.contributor.departmentHigh-Speed Fluids Imaging Laboratoryen
dc.identifier.journalLangmuiren
dc.contributor.institutionDepartment of Mathematics and Statistics, University of Melbourne, Parkville, VIC 3010, Australiaen
dc.contributor.institutionDepartment of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, VIC 3122, Australiaen
kaust.authorLi, Erqiangen
kaust.authorVakarelski, Ivan Urieven
kaust.authorThoroddsen, Sigurdur T.en
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