Coalescence in Two-Dimensional Foams: A Purely Statistical Process Dependent on Film Area

Forel, Emilie; Dollet, Benjamin; Langévin, D.; Rio, Emmanuelle

doi:10.1103/physrevlett.122.088002

Cited by 40 publications

(25 citation statements)

References 15 publications

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“…5). This highlights the importance of local film geometry and microstructure in rearrangements similarly to bubble coalescence [43]. The development of the shape or perimeter of a bubble and its neighborhood is symmetric in time for the bubble participating in a T1 event.…”

Section: Discussionmentioning

confidence: 84%

Machine learning and predicting the time-dependent dynamics of local yielding in dry foams

Viitanen

Intyre

Koivisto

et al. 2020

Phys. Rev. Research

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Section: Discussionmentioning

confidence: 84%

Machine learning and predicting the time-dependent dynamics of local yielding in dry foams

Viitanen

Intyre

Koivisto

et al. 2020

Phys. Rev. Research

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“…Note that some uncertainties rely on the specific liquid fraction at which we assume that the destabilization of the foam would occur, a point still debated in literature [44]. But it hardly affects the location of the theoretical curve and of the critical capillary number at a given Bond number.…”

Section: B Combined Thermal and Electrical Gradients Induce Drainagementioning

confidence: 98%

Thermally Enhanced Electro-osmosis to Control Foam Stability

Bonhomme

Biance

2020

Phys. Rev. X

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Liquid foam is a dense dispersion of liquid bubbles in a surfactant solution. Because of its large surface area, it is an out-of-equilibrium material that evolves with space and time because of coarsening, coalescence, and liquid drainage. In many applications, it is required to control the lifetime of a foam by limiting the drainage or triggering the collapse at a specific location or a given time. We show here that applying an external electric field at the edge of the foam induces some liquid flows. Depending on the flow magnitude, it controls either gravity driven drainage, the foam stability, or the foam collapse at a specific location. Thus, applying an electric field to a liquid foam can control its stability. The experimental results are quantitatively described by a simple model taking into account first the electro-osmotic transport in such a deformable medium and second the Marangoni flows induced by heterogeneous heating due to Joule effect. More specifically, we show for the first time that electro-osmosis can be strongly enhanced due to thermal gradients generated by the applied electric field.

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“…The mechanisms of emulsion coalescence are still under debate. Explanations to describe this phenomenon include capillary pressures exceeding disjoining pressures 29,32 , involve topological rearrangements of emulsions oil droplets separated by thin films 33,34 , film breakage being purely stochastic processes 35 or stretching-induced breakage followed by coalescence cascades 36 . In the case presented here, the emulsion drops destabilize in a similar manner as evaporating emulsion films 28,29,36 , in which the destabilization happens below a critical volume fraction of the continuous phase.…”

Section: Confinement and Coalescence Of Oil Droplets To Further Elucmentioning

confidence: 99%

Deposits from evaporating emulsion drops

Bittermann¹,

Deblais²,

Lépinay³

et al. 2020

Sci Rep

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The processes in which droplets evaporate from solid surfaces, leaving behind distinct deposition patterns, have been studied extensively for variety of solutions. In this work, by combining different microscopy techniques (confocal fluorescence, video and Raman) we investigate pattern formation and evaporation-induced phase change in drying oil-in-water emulsion drops. This combination of techniques allows us to perform drop shape analysis while visualizing the internal emulsion structure simultaneously. We observe that drying of the continuous water phase of emulsion drops on hydrophilic surfaces favors the formation of ring-like zones depleted of oil droplets at the contact line, which originate from geometrical confinement of oil droplets by the meniscus. From such a depletion zone, a “coffee ring” composed of surfactant molecules forms as the water evaporates. On all surfaces drying induces emulsion destabilization by coalescence of oil droplets, commencing at the drop periphery. For hydrophobic surfaces, the coalescence of the oil droplets leads to a uniform oil film spreading out from the initial contact line. The evaporation dynamics of these composite drops indicate that the water in the continuous phase of the emulsion drops evaporates predominantly by diffusion through the vapor, showing no large differences to the evaporation of simple water drops.

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Coalescence in Two-Dimensional Foams: A Purely Statistical Process Dependent on Film Area

Cited by 40 publications

References 15 publications

Machine learning and predicting the time-dependent dynamics of local yielding in dry foams

Machine learning and predicting the time-dependent dynamics of local yielding in dry foams

Thermally Enhanced Electro-osmosis to Control Foam Stability

Deposits from evaporating emulsion drops

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