KAUST Grant NumberKUK-C1-013-04
Permanent link to this recordhttp://hdl.handle.net/10754/600200
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AbstractThe protein hydrophobin HFBII self-assembles into very elastic films at the surface of water; these films wrinkle readily upon compression. We demonstrate and study this wrinkling instability in the context of non-planar interfaces by forming HFBII layers at the surface of bubbles whose interfaces are then compressed by deflation of the bubble. By varying the initial concentration of the hydrophobin solutions, we are able to show that buckling occurs at a critical packing fraction of protein molecules on the surface. Independent experiments show that at this packing fraction the interface has a finite positive surface tension, and not zero surface tension as is usually assumed at buckling. We attribute this non-zero wrinkling tension to the finite elasticity of these interfaces. We develop a simple geometrical model for the evolution of the wrinkle length with further deflation and show that wrinkles grow rapidly near the needle (used for deflation) towards the mid-plane of the bubble. This geometrical model yields predictions for the length of wrinkles in good agreement with experiments independently of the rheological properties of the adsorbed layer. © 2013 EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.
CitationAumaitre E, Knoche S, Cicuta P, Vella D (2013) Wrinkling in the deflation of elastic bubbles. Eur Phys J E 36. Available: http://dx.doi.org/10.1140/epje/i2013-13022-3.
SponsorsEPSRC and Unilever plc. have funded this project through a CASE award. This publication is based on work supported in part by Grant No. KUK-C1-013-04, made by King Abdullah University of Science and Technology (KAUST) and in part by an Oppenheimer Early Career Research Fellowship (D.V.).
JournalThe European Physical Journal E
CollectionsPublications Acknowledging KAUST Support
- Unique properties of bubbles and foam films stabilized by HFBII hydrophobin.
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- Issue date: 2013 Oct 8
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- Issue date: 2015 Feb 15
- Surface pressure and elasticity of hydrophobin HFBII layers on the air-water interface: rheology versus structure detected by AFM imaging.
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- Issue date: 2013 May 21
- Shear rheology of mixed protein adsorption layers vs their structure studied by surface force measurements.
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- Issue date: 2015 Aug