Outstanding Stability of Particle-Stabilized Bubbles

Du, Zongliang; Bilbao-Montoya, † Maria P.; Binks, Bernard P.; Dickinson, Eric; Ettelaie, and Rammile; Murray, Brent S.

doi:10.1021/la034042n

Cited by 311 publications

(284 citation statements)

References 11 publications

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“…[3] The remarkable resistance of our particle-stabilized foams against coalescence and disproportionation is most likely imparted by the strong attachment of particles at the air-water interface ( Figure 4 in the article) and by the formation of an attractive particle network at the interface and throughout the foam lamella. [4,5] Particles attached to the air-water interface can reduce the overall foam free energy by thousands of kTs, if a considerable amount of interfacial area is replaced upon a dsorption. [6,7] Such a reduction in free energy makes the interfacial adsorption of partially lyophobic particles an irreversible process, as opposed to the continuous adsorption and desorption of conventional surfactant molecules at the air-water interface (Gibbs-Marangoni effect).…”

Section: Stabilization Mechanismmentioning

confidence: 99%

Ultrastable Particle‐Stabilized Foams

et al. 2006

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Pump up the volume: Wet foams prepared with surfactants are thermodynamically unstable systems that undergo rapid disproportionation, drainage, and coalescence. Ultrastable foams have now been prepared using colloidal particles as stabilizers (left picture). The stabilization results from the irreversible adsorption at the air–water interface of particles surface‐modified with short‐chain amphiphiles (right picture).

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Section: Stabilization Mechanismmentioning

confidence: 99%

Ultrastable Particle‐Stabilized Foams

et al. 2006

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“…By taking up the stress, the networks of particles on the surface of bubbles compensate for the Laplace pressure differences and prevent the shrinkage of the bubbles. Since demonstrating the feasibility of the method 13,19 , there has been much interest in the study of particle stabilised bubbles, 3,14,[20][21][22][23][24][25] though preparation of Pickering bubbles still remains a more difficult proposition compared to Pickering emulsions. 26 In achieving the desired bubble stability a number of points have to be considered.…”

Section: Introductionmentioning

confidence: 99%

Effect of particle adsorption rates on the disproportionation process in pickering stabilised bubbles

Ettelaie

Murray

2014

The Journal of Chemical Physics

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The degree of shrinkage of particle stabilised bubbles of various sizes, in a polydisperse bubble dispersion, has been investigated in the light of the finite adsorption times for the particles and the disproportionation kinetics of the bubbles. For the case where the system contains an abundance of particles we find a threshold radius, above which bubbles are stabilised without any significant reduction in their size. Bubbles with an initial radius below this threshold on the other hand, undergo a large degree of shrinkage prior to stabilisation.As the ratio of the available particles to the bubbles is reduced, it is shown that the final bubble size, for the larger bubbles in the distribution, becomes increasingly governed by the number of particles, rather than their adsorption time per se. For systems with "adsorption controlled" shrinkage ratio, the final bubble distribution is found to be wider than the initial one, while for a "particle number controlled" case it is actually narrower. Starting from an unimodal bubble size distribution, we predict that at intermediate times, prior to the full stabilisation of all bubbles, the distribution breaks up into a bimodal one. However, the effect is transient and an unimodal final bubble size distribution is recovered once again, when all the bubbles are stabilised by the particles.-3-1

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“…In this approach it is the adsorption of small nanoparticles, as oppose to molecular species, onto the surface of droplets or bubbles that is responsible for their colloidal stabilisation. Although known for quite some time, the first systematic studies of Pickering emulsions were carried out by Binks and Lumsdon in a series of studies [23][24][25][26] , and later extended to bubbles by the same and other researchers [27][28][29]. As with any other type of emulsion or foam, strictly speaking, droplets and bubbles stabilised by particles remain thermodynamically unstable.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, the macromolecules either desorb from the surface as the bubble shrinks or, where they form cross-linked films, the interfacial layers buckle and crinkle until only a shrivelled up shell of protein is left behind. In contrast, particle stabilised bubbles, once they are generated, retain their size for periods of days with no appreciable shrinkage [29,31] or sign of dissolution.…”

Section: Introductionmentioning

confidence: 99%

Evolution of bubble size distribution in particle stabilised bubble dispersions: Competition between particle adsorption and dissolution kinetics

Ettelaie

Murray

2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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It is shown that in systems containing bubbles stabilised by nanoparticles, the time scales for the dissolution of small microbubbles can be comparable with those involving the transport and adsorption of the stabilising nanoparticles onto the surface of the bubbles. We have studied the evolution of model bubble size distribution functions in the light of this effect and also the competition between different sized bubbles for the finite number of available particles. It is found that for dispersions moderately rich in nanoparticles, the width of the final distribution function can become broader than the initial one, whereas for cases deficient in particles the reverse is observed. For each given bubble size, there exists a particle to bubble concentration ratio above which the final size of a bubble of this radius is no longer affected by the presence of other bubbles. In a system deficient in particles, this can still hold true for bubbles in the lower end of the size distribution range, but not the ones at the upper end. By considering simple cases consisting of just two bubbles sizes, we show that the degree of shrinkage of the bigger bubbles is significantly increased in the presence of a small amount of gas in the form of smaller bubbles. In contrast, the final bubble size of the smaller bubbles is found to be largely insensitive to the amount of gas included within larger bubbles.The implications of these results for the final fraction of retained gas, in these types of particle stabilised bubble systems, is also discussed.3

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Outstanding Stability of Particle-Stabilized Bubbles

Cited by 311 publications

References 11 publications

Ultrastable Particle‐Stabilized Foams

Ultrastable Particle‐Stabilized Foams

Effect of particle adsorption rates on the disproportionation process in pickering stabilised bubbles

Evolution of bubble size distribution in particle stabilised bubble dispersions: Competition between particle adsorption and dissolution kinetics

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