The role of surface rheology in liquid film formation

Scheid, Benoît; Delacotte, Jérôme; Dollet, Benjamin; Rio, Emmanuelle; Restagno, Frédéric; Nierop, Ernst A. van; Cantat, Isabelle; Langévin, D.; Stone, Howard A.

doi:10.1209/0295-5075/90/24002

Cited by 64 publications

(101 citation statements)

References 20 publications

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“…In foam dynamics as in most of dynamical systems involving fluid-fluid interfaces with surface-active materials, like in coalescence processes, both surface viscosity and elasticity, with both shear and dilational components, are often indissociable, which makes the physical interpretation difficult, if not impossible. Still for some specific flow situations with an appropriate surfactant mixture, conditions can be reached where only one component dominates the others [2]. The claim of the present Letter is that such a situation can be met with antibubbles.…”

mentioning

confidence: 75%

“…We first consider the no-slip condition at the air-liquid interfaces, i.e., for Bq ! 1, and solve (1), (2), and (4) with u s ¼ 0. Numerical solutions are plotted in Fig.…”

mentioning

confidence: 99%

“…It thus only applies for the RS1. Simplifying the system (1), (2), and (4) accordingly, and after some algebra, one gets the asymptotic behavior of the lifetime in the no-slip limit (see derivation in Ref. [8]):…”

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confidence: 99%

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Antibubble Dynamics: The Drainage of an Air Film with Viscous Interfaces

et al. 2012

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An antibubble is a spherical air film that is immersed in a surfactant mixture and drains under the action of hydrostatic pressure. A dynamical model of this film is proposed that accounts for the surface shear viscosity effects in the case of purely viscous interfaces, which applies for surfactants whose adsorption rate is much larger than advection rate and at a concentration much above the critical micelle concentration. Our model shows that the lifetime of the antibubbles in this case increases with surface shear viscosity, denoted ", whose value is measured independently, all in agreement with experimental measurements. We also found that the critical thickness, h c , at film rupture due to van der Waals interactions slightly depends on the surface shear viscosity, namely h c / " 1=6 .

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mentioning

confidence: 75%

“…We first consider the no-slip condition at the air-liquid interfaces, i.e., for Bq ! 1, and solve (1), (2), and (4) with u s ¼ 0. Numerical solutions are plotted in Fig.…”

mentioning

confidence: 99%

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Antibubble Dynamics: The Drainage of an Air Film with Viscous Interfaces

et al. 2012

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“…Models assuming elastic (Park 1991) or viscous (Scheid et al 2010) interfaces both predict an incompressible behaviour of the interfaces at low velocities and a transition towards another regime above a critical capillary number. However, the nature of these transitions is different from the results plotted in figure 4(b).…”

Section: Film Thickness and Velocity Fieldmentioning

confidence: 99%

Theoretical study of the generation of soap films: role of interfacial visco-elasticity

2013

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In this work, we study theoretically the thickness of a liquid film (typically made of a surfactant solution) pulled out of a bath at constant speed in the absence of gravity, when it features a viscous or an elastic interfacial rheology. We show that a purely viscous rheology does not lead to the extraction of a steady state film of constant thickness. In contrast, the thickness of the film is well defined in the elastic case, which allows us to compute it. This thickness depends on the capillary number of the experiment, and on the elasticity of the interface. It is always lower than or equal to that obtained for an incompressible interface predicted by Frankel (Mysels, Shinoda and Frankel, Soap Films: Studies of their Thinning and a Bibliography, 1959), which is recovered in the limit of an arbitrary large elasticity.

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“…Still, the surface rheological parameters involved in the models -surface elasticity and viscosity -are difficult to measure experimentally. Quantitative comparison between thin film models including surface rheology and experimental data is scarce in the literature 5,33,34 . Moreover, most experimental data available on thin films were obtained with water-soluble surfactant: comparison to models neglecting mass exchange between the surface and the bulk is thus to be done with caution -but remains possible 35 in certain conditions, as will be discussed later on.…”

Section: Introductionmentioning

confidence: 99%

Surfactant-induced rigidity of interfaces: a unified approach to free and dip-coated films

et al. 2015

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The behavior of thin liquid films is known to be strongly affected by the presence of surfactants at the interfaces. The detailed mechanism by which the latter enhance film stability is still a matter of debate, in particular concerning the influence of surface elastic effects on the hydrodynamic boundary condition at the liquid/air interfaces. In the present work, "twin" hydrodynamic models neglecting surfactant transport to the interfaces are proposed to describe the coating of films onto a solid plate (LandauLevich-Derjaguin configuration) as well as soap film pulling (Frankel configuration). Experimental data on the entrained film thickness in both configurations can be fitted very well using a single value of the surface elasticity, which is in good agreement with independent measurements by mean of surface expansion experiments in a Langmuir through. The analysis shows how and when the soap films or dip coating experiments may be used to precisely and sensitively measure the surface elasticity of surfactant solutions.

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The role of surface rheology in liquid film formation

Cited by 64 publications

References 20 publications

Antibubble Dynamics: The Drainage of an Air Film with Viscous Interfaces

Antibubble Dynamics: The Drainage of an Air Film with Viscous Interfaces

Theoretical study of the generation of soap films: role of interfacial visco-elasticity

Surfactant-induced rigidity of interfaces: a unified approach to free and dip-coated films

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