Nanoemulsions obtained via bubble-bursting at a compound interface

Feng, Jie; Roché, Matthieu; Vigolo, Daniele; Arnaudov, Luben N.; Stoyanov, Simeon D.; Gurkov, Theodor D.; Tsutsumanova, Gichka G.; Stone, Howard A.

doi:10.1038/nphys3003

Cited by 93 publications

(99 citation statements)

References 39 publications

(32 reference statements)

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“…In this paper we present a theoretical model for this canonical two-layer system that provides predictions for the possible mechanism of separated rupture, the parameter regimes for which we expect separated rupture and those when simultaneous rupture should take place. The results of our analysis of this model problem provide indications of the role that various features might play in more complex, physically relevant, scenarios such as the bubble bursting in oil spills mentioned in Feng et al (2014). The canonical configuration comprises a rising bubble in a bath of water, which is covered with a thin layer of oil.…”

Section: Introductionmentioning

confidence: 99%

“…In some experimental scenarios, Feng et al (2014) observed simultaneous rupture of the oil and water layers. However, in others they observed rupture of the distinct films of oil and water separately: the oil layer ruptures first, retracting across the water layer beneath, which is then followed by the rupture of the water layer; we refer to such dynamics as 'separated rupture'.…”

Section: Introductionmentioning

confidence: 99%

“…As the bubble continues to rise, the liquid films thin and attractive van der Waals forces between the interfaces drive an instability that will ultimately rupture the film in finite time. For the system composed of alkanes with an aqueous solution with surfactant C n TAB, typically the oil film is observed to rupture first, which then retracts over the aqueous film beneath, with the aqueous layer rupturing up to several hundreds of milliseconds later (Feng et al 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Feng et al (2014) examined the dynamics of a rising bubble in an aqueous phase coated with a thin layer of oil, and demonstrated that bubble rupture at the compound air/oil/aqueous interface can disperse submicrometre oil droplets into the aqueous phase. Such a physical system is reminiscent of oil spillages floating at sea, and the discovery suggests a mechanism whereby the oil droplets can be drawn into the water where the high surface-to-volume ratio of the small droplets could help bacteria and algae to degrade the oil faster, though the possibility of pollutants digested by sea creatures is also expected to be increased as a negative consequence.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, we consider the case where both layers experience a non-retarded (attractive) van der Waals force between the interfaces so as to isolate parameter regimes and interfacial conditions for which either both layers rupture simultaneously or the two layers rupture distinctly, which provides insight into the role of surfactant and wettability on the rupture mechanics. We choose to study a simplified geometry comprising two liquid films with a common interface, surrounded on both sides by a passive gas, which captures the key features of the final stages of bubble bursting considered in Feng et al (2014). Here the gas beneath the films may be identified with a rising bubble in the liquid while the gas above corresponds to the surrounding atmosphere (figure 2a).…”

Section: Introductionmentioning

confidence: 99%

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Stability of a bi-layer free film: simultaneous or individual rupture events?

et al. 2015

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We consider the stability of a long free film of liquid composed of two immiscible layers of differing viscosities, where each layer experiences a van der Waals force between its interfaces. We analyse the different ways the system can exhibit interfacial instability when the liquid layers are sufficiently thin. For an excess of surfactant on one gas-liquid interface the coupling between the layers is relatively weak and the instability manifests as temporally separated rupture events in each layer. Conversely, in the absence of surfactant the coupling between the layers is much stronger and the instability manifests as rupture of both layers simultaneously. These features are consistent with recent experimental observations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stability of a bi-layer free film: simultaneous or individual rupture events?

et al. 2015

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Crude oil jets in crossflow: Effects of dispersant concentration on plume behavior

et al. 2016

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This study investigates the effects of premixing oil with chemical dispersant at varying concentrations on the flow structure and droplet dynamics within a crude oil jet transitioning into a plume in a crossflow. It is motivated by the need to determine the fate of subsurface oil after a well blowout. The laboratory experiments consist of flow visualizations, in situ measurements of the time evolution of droplet-size distributions using holography, and particle image velocimetry to characterize dominant flow features. Increasing the dispersant concentration dramatically decreases the droplet sizes and increases their number, and accordingly, reduces the rise rates of droplets and the upper boundary of the plume. The flow within the plume consists primarily of a pair of counterrotating quasi-streamwise vortices (CVP) that characterize jets in crossflows. It also involves generation of vertical wake vortices that entrain small droplets under the plume. The evolution of plume boundaries is dominated by interactions of droplets with the CVP. The combined effects of vortex-induced velocity and significant quiescent rise velocity of large ($5 mm) droplets closely agree with the rise rate of the upper boundary of the crude oil plume. Conversely, the much lower rise velocity of the smaller droplets in oil-dispersant mixtures results in plume boundaries rising at rates that are very similar to those of the CVP center. The size of droplets trapped by the CVP is predicted correctly using a trapping function, which is based on a balance of forces on a droplet located within a horizontal eddy.

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The influence of marine microbial activities on aerosol production: A laboratory mesocosm study

et al. 2015

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The oceans cover most of the Earth's surface, contain nearly half the total global primary biomass productivity, and are a major source of atmospheric aerosol particles. Here we experimentally investigate links between biological activity in seawater and sea spray aerosol (SSA) flux, a relationship of potential significance for organic aerosol loading and cloud formation over the oceans and thus for climate globally. Bubbles were generated in laboratory mesocosm experiments either by recirculating impinging water jets or glass frits. Experiments were conducted with Atlantic Ocean seawater collected off the eastern end of Long Island, NY, and with artificial seawater containing cultures of bacteria and phytoplankton Thalassiosira pseudonana, Emiliania huxleyi, and Nannochloris atomus. Changes in SSA size distributions occurred during all phases of bacterial and phytoplankton growth, as characterized by cell concentrations, dissolved organic carbon, total particulate carbon, and transparent exopolymer particles (gel-forming polysaccharides representing a major component of biogenic exudate material). Over a 2 week growth period, SSA particle concentrations increased by a factor of less than 2 when only bacteria were present and by a factor of about 3 when bacteria and phytoplankton were present. Production of jet-generated SSA particles of diameter less than 200 nm increased with time, while production of all particle diameters increased with time when frits were used. The implications of a marine biological activity dependent SSA flux are discussed.

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Nanoemulsions obtained via bubble-bursting at a compound interface

Cited by 93 publications

References 39 publications

Stability of a bi-layer free film: simultaneous or individual rupture events?

Stability of a bi-layer free film: simultaneous or individual rupture events?

Crude oil jets in crossflow: Effects of dispersant concentration on plume behavior

The influence of marine microbial activities on aerosol production: A laboratory mesocosm study

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