Rupture of Wetting Films Formed by Bubbles at a Quartz Surface in Cationic Surfactant Solutions

Wiertel-Pochopien, Agata; Zawała, Jan

doi:10.1002/ceat.201900003

Cited by 7 publications

(2 citation statements)

References 39 publications

(47 reference statements)

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“…As seen in Figure , around the values of θ max , also the flotation recovery is at maximum (almost 100%), while the t TPC value, after a rather steep decrease, starts to be constant. Such θ and t TPC behavior vs concentration was attributed to two different mechanisms of rupture of the intervening liquid (wetting) film formed during the bubble collision with the solution/quartz interface. ,− More detailed analysis of these mechanisms is out of the scope of this paper. Here, we would like to underline that the θ and t TPC values strongly correlate with the flotation response.…”

Section: Analysis Of the Synergistic Effect Mechanismmentioning

confidence: 99%

Synergistic Effect of Binary Surfactant Mixtures in Two-Phase and Three-Phase Systems

et al. 2021

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Cationic alkyltrimethylammonium bromides (C n TAB, with n = 8, 12, 16, 18) and their mixtures with n -octanol as a nonionic surfactant were chosen as a model system to study the synergistic effect on foamability (two-phase system) and floatability (three-phase system) of quartz in the presence of binary mixtures of ionic/nonionic surfactants. The foam height of one-component solutions and binary mixtures and floatability of quartz particles were characterized as a function of the surfactant concentration and the number of carbons ( n ) in the alkyl chain of C n TAB. The experimental results of foamability and floatability measurements in one-component and mixed solutions revealed the synergistic effect, causing a significant enhancement in the foam height and recovery of quartz. In the presence of n -octanol, the height of foam increased remarkably for all C n TAB solutions studied, and this effect, whose magnitude depended on the C n TAB hydrophobic tail length, could not be justified by a simple increase in total surfactant concentration. A similar picture was obtained in the case of flotation response. The mechanism of synergistic effect observed in mixed C n TAB/ n -octanol solutions was proposed. The discussion was supported by molecular dynamics simulations, and the probable mechanism responsible for synergism was discussed. In addition, an analysis allowing accurate determination of the concentration regimes, where the synergistic effect can be expected, was given. It was shown that for the two-phase system, the n -octanol molecule preadsorption at the liquid/gas interface causes an increase in C n TAB adsorption coverage over the level expected from its equilibrium value in the one-component solution. In the case of the three-phase system, the synergistic effect was related to the ionic surfactants serving as an anchor layer for n -octanol, which, in water/ n -octanol solution (one-component system), do not adsorb on the surface of quartz.

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Section: Analysis Of the Synergistic Effect Mechanismmentioning

confidence: 99%

Synergistic Effect of Binary Surfactant Mixtures in Two-Phase and Three-Phase Systems

et al. 2021

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“…For instance, in order to improve the efficiency of oil recovery processes in which oil droplets are pushed by a water flow in a porous medium, water films between oil and solid are needed to persist for a long time. Similarly in microfluidic droplet manipulation, oil droplets are required not to wet the surfaces of the channels.Addition of surfactants to the liquid increases the lifetimes of liquid films because the interactions between the interfaces are then modified and the energy barrier for film rupture increases [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Spinodal stratification in micellar films between oil and silica

et al. 2021

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We report on the thinning mechanisms of supported films of surfactant (nTAB) solutions above the critical micellar concentration. The films are formed by pressing an oil drop immersed in an aqueous surfactant solution on a silica surface. Depending on the length of the carbon chain of the surfactant and its concentration, two modes of destabilisation of the stratified films are observed. The first one proceeds by heterogeneous nucleation, characterised by the lateral expansion of the domain of lower thickness, as evidenced long ago in suspended micellar films. In addition, the simultaneous stepwise thinning of several domains, called spinodal stratification, is observed here for the first time in supported films. We measure the time evolution of the thickness of the films and we discuss the selection mechanism of each destabilisation mode.

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On importance of external conditions and properties of the interacting phases in formation and stability of symmetrical and unsymmetrical liquid films

Zawała

Małysa

Kowalczuk

2020

Advances in Colloid and Interface Science

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Rupture of Wetting Films Formed by Bubbles at a Quartz Surface in Cationic Surfactant Solutions

Cited by 7 publications

References 39 publications

Synergistic Effect of Binary Surfactant Mixtures in Two-Phase and Three-Phase Systems

Synergistic Effect of Binary Surfactant Mixtures in Two-Phase and Three-Phase Systems

Spinodal stratification in micellar films between oil and silica

On importance of external conditions and properties of the interacting phases in formation and stability of symmetrical and unsymmetrical liquid films

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