Single bubble and drop techniques for characterizing foams and emulsions

Suja, Vineeth Chandran; Rodríguez-Hakim, Mariana; Tajuelo, Javier; Fuller, Gerald G.

doi:10.1016/j.cis.2020.102295

Cited by 35 publications

(30 citation statements)

References 205 publications

(422 reference statements)

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“…A similar behaviour was reported for flat films made of melted glass [58]. The stabilisation effect of evaporation is mentioned in the review by Suja et al [13] and supported by Lorenceau et al [59] notably with the remark that bubbles formed in an ethanol/water binary solution are completely unstable if the ambient atmosphere is saturated in ethanol while they live generally tens of seconds when evaporation is allowed to proceed.…”

Section: Evaporationsupporting

confidence: 71%

“…Note that β = 2 corresponds to the Rayleigh distribution previously mentioned. These different situations have been reviewed recently by Suja et al [13].…”

Section: In Absence Of Stabilising Moleculesmentioning

confidence: 98%

“…Bubbles are also relevant in the glass industry where they favour homogenization of the melt but also constitute a major source of defects [12] and of energy loss as the formation of foam at the surface of the melt screens the heat coming from above. As the primary building block of a foam, the study of bubbles and their stability at the surface gets even broader, as was recently reviewed recently by Suja et al [13]. To take an image from the daily life, a beer drinker may prefer a beer with some foam above it: drink a foam means drink a beer in Belgium.…”

Section: Introductionmentioning

confidence: 99%

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The Life of a Surface Bubble

2021

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Surface bubbles are present in many industrial processes and in nature, as well as in carbonated beverages. They have motivated many theoretical, numerical and experimental works. This paper presents the current knowledge on the physics of surface bubbles lifetime and shows the diversity of mechanisms at play that depend on the properties of the bath, the interfaces and the ambient air. In particular, we explore the role of drainage and evaporation on film thinning. We highlight the existence of two different scenarios depending on whether the cap film ruptures at large or small thickness compared to the thickness at which van der Waals interaction come in to play.

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Section: Evaporationsupporting

confidence: 71%

“…Note that β = 2 corresponds to the Rayleigh distribution previously mentioned. These different situations have been reviewed recently by Suja et al [13].…”

Section: In Absence Of Stabilising Moleculesmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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The Life of a Surface Bubble

2021

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“…To create and separate the droplet interface phospholipid bilayers, we used the I-DDiaSS set-up [36][37][38]. As shown in figure 1a, the I-DDiaSS consists of a glass chamber to hold the hexadecane solution and a sessile drop.…”

Section: Experimental Set-upmentioning

confidence: 99%

Surface energy and separation mechanics of droplet interface phospholipid bilayers

Huang

Suja

Tajuelo

et al. 2021

J. R. Soc. Interface.

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Droplet interface bilayers are a convenient model system to study the physio-chemical properties of phospholipid bilayers, the major component of the cell membrane. The mechanical response of these bilayers to various external mechanical stimuli is an active area of research because of its implications for cellular viability and the development of artificial cells. In this article, we characterize the separation mechanics of droplet interface bilayers under step strain using a combination of experiments and numerical modelling. Initially, we show that the bilayer surface energy can be obtained using principles of energy conservation. Subsequently, we subject the system to a step strain by separating the drops in a step-wise manner, and track the evolution of the bilayer contact angle and radius. The relaxation time of the bilayer contact angle and radius along with the decay magnitude of the bilayer radius were observed to increase with each separation step. By analysing the forces acting on the bilayer and the rate of separation, we show that the bilayer separates primarily through the peeling process with the dominant resistance to separation coming from viscous dissipation associated with corner flows. Finally, we explain the intrinsic features of the observed bilayer separation by means of a mathematical model comprising the Young–Laplace equation and an evolution equation. We believe that the reported experimental and numerical results extend the scientific understanding of lipid bilayer mechanics, and that the developed experimental and numerical tools offer a convenient platform to study the mechanics of other types of bilayers.

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“…These results were confirmed also with a different surface-active polymer, that is, polyethylene glycol (PEG). PEG is known to be surface active and can form a monolayer at an air/water interface as well as a self-assembled film from an aqueous solution (26)(27)(28)(29)(30). Experiments of bubble bursting were performed using solutions of PEG and BSA + PEG.…”

Section: Significancementioning

confidence: 99%

Flowering in bursting bubbles with viscoelastic interfaces

Tammaro

Suja

Kannan

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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The lifetime of bubbles, from formation to rupture, attracts attention because bubbles are often present in natural and industrial processes, and their geometry, drainage, coarsening, and rupture strongly affect those operations. Bubble rupture happens rapidly, and it may generate a cascade of small droplets or bubbles. Once a hole is nucleated within a bubble, it opens up with a variety of shapes and velocities depending on the liquid properties. A range of bubble rupture modes are reported in literature in which the reduction of a surface energy drives the rupture against inertial and viscous forces. The role of surface viscoelasticity of the liquid film in this colorful scenario is, however, still unknown. We found that the presence of interfacial viscoelasticity has a profound effect in the bubble bursting dynamics. Indeed, we observed different bubble bursting mechanisms upon the transition from viscous-controlled to surface viscoelasticity-controlled rupture. When this transition occurs, a bursting bubble resembling the blooming of a flower is observed. A simple modeling argument is proposed, leading to the prediction of the characteristic length scales and the number and shape of the bubble flower petals, thus paving the way for the control of liquid formulations with surface viscoelasticity as a key ingredient. These findings can have important implications in the study of bubble dynamics, with consequences for the numerous processes involving bubble rupture. Bubble flowering can indeed impact phenomena such as the spreading of nutrients in nature or the life of cells in bioreactors.

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Single bubble and drop techniques for characterizing foams and emulsions

Cited by 35 publications

References 205 publications

The Life of a Surface Bubble

The Life of a Surface Bubble

Surface energy and separation mechanics of droplet interface phospholipid bilayers

Flowering in bursting bubbles with viscoelastic interfaces

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