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The role of surface rheology in liquid film formation

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TLDR
In this paper, the role of surface viscosity in the classical film-coating problem is investigated, and a theoretical model that predicts film thickening based on a purely surface-viscous theory is proposed.
Abstract
The role of surface rheology in fundamental fluid dynamical systems, such as liquid coating flows and soap film formation, is poorly understood. We investigate the role of surface viscosity in the classical film-coating problem. We propose a theoretical model that predicts film thickening based on a purely surface-viscous theory. The theory is supported by a set of new experimental data that demonstrates slight thickening even at very high surfactant concentrations for which Marangoni effects are irrelevant. The model and experiments represent a new regime that has not been identified before.

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Journal ArticleDOI

Rheology of foams and highly concentrated emulsions

TL;DR: In this article, the state of the art in foam and highly concentrated emulsion rheology is reviewed, with an emphasis on progress made over the last five years, and experiments and models concerning elasticity, osmotic pressure, yielding and flow behavior are presented.
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Rheology of Adsorbed Surfactant Monolayers at Fluid Surfaces

TL;DR: A review of surface rheology can be found in this article, focusing on recent advances and giving examples of phenomena in which surface Rheology plays an important role, including surface compression elasticity and viscosity.
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Pumping-out photo-surfactants from an air–water interface using light

TL;DR: In this paper, the adsorption dynamics of an azobenzene-based photo-responsive charged surfactant were investigated and the photo-stimulation impacts the dynamics at an air-water interface.
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Surfactant dynamics: hidden variables controlling fluid flows

TL;DR: This Perspective describes, in one coherent piece, both the equilibrium properties and dynamic processes of surfactants, to better enable the fluid mechanics community to understand, interpret and design surfactant/fluid systems.
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Emulsions in porous media: From single droplet behavior to applications for oil recovery

TL;DR: The description of emulsion flow in porous media spanning from the behaviour of single droplets to the collective flow of a suspension of droplets, including the effect of bulk and interfacial rheology, hydrodynamic and physico-chemical interactions is focused on.
References
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Book

The Colloidal Domain: Where Physics, Chemistry, Biology, and Technology Meet

TL;DR: This text tackles fundamental colloidal issues, illustrating them with the relevant experimental techniques, and shows the connection between the molecular world and the colloidal domain, and how molecular interactions lead to colloidal behaviour.
Journal ArticleDOI

The Colloidal Domain – where physics, chemistry, biology and technology meet

Walter Richtering
- 01 Aug 2001 - 
TL;DR: The Colloidal Domain by Evans and Wennerström as discussed by the authors provides a well written and clear description of the state-of-the-art in colloid science with a special emphasis on surfactant based systems.
Book

Foams: Theory: Measurements: Applications

TL;DR: In this article, the theory and role of interfacial rheological properties experimental results on foam rheology experimental techniques for the characterization of foams fundamental methods for measuring foam stability nonaqueous foams additives for foams foam wet processing in the textile industry foams in personal care products, enhanced oil recovery foams for firefighting foams, mineral flotation and separation processes science and technology of silicone antifoams.
Journal ArticleDOI

Stress- and strain-controlled measurements of interfacial shear viscosity and viscoelasticity at liquid/liquid and gas/liquid interfaces

TL;DR: In this paper, an interfacial rheometer for both stress and strain-controlled measurements of shear rheological properties at liquid/liquid and gas/liquid interfaces is presented, based on a rotating or oscillating biconical bob design in combination with a low friction electronically commutated motor system.
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