Statistics of rupture in relation to the stability of thin liquid films with different size

Gurkov, Theodor D.; Angarska, Jana K.; Tachev, K.D.; Gaschler, Wolfgang

doi:10.1016/j.colsurfa.2010.12.010

Cited by 9 publications

(5 citation statements)

References 18 publications

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“…A stochastic distribution of h c is always observed. 22,23 Stochastic Theory of Coalescence. It has been experimentally observed by several workers that the coalescence time of bubbles does not have a single value even under identical experimental conditions (i.e., when the size of the bubbles, temperature of the system, and composition of the solution remain constant), but a wide distribution is omnipresent.…”

Section: ' General Theorymentioning

confidence: 99%

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Coalescence of Bubbles and Stability of Foams in Brij Surfactant Systems

Samanta

Ghosh

2011

Ind. Eng. Chem. Res.

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This work presents coalescence of air bubbles and stability of foams in aqueous solutions of polyoxyethylene (4) lauryl ether (Brij 30), polyoxyethylene (23) lauryl ether (Brij 35), and polyoxyethylene (20) oleyl ether (Brij 98). Adsorption of these surfactants at the air-water interface was also studied. The surface tension profiles were fitted by the Szyskowski equation. It was found that the surface tensions at the critical micelle concentrations of these surfactants followed the sequence Brij 35 > Brij 98 > Brij 30. The air bubbles were most stable to coalescence in Brij 35 solution and least stable in Brij 30 solution. Coalescence in Brij 35 solution was hindered beyond a certain concentration of the surfactant. Stochastic distributions of coalescence time were observed in all surfactant systems. These distributions were fitted well by the stochastic model. Seven film-drainage models were used to predict the coalescence time. However, their predictions did not agree well with the mean values of the coalescence time distributions. Stability of foams was analyzed by the Ross-Miles test. The initial and residual foam heights were measured at each surfactant concentration. The foam heights followed the trends that are expected from the coalescence times of the bubbles.

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Section: ' General Theorymentioning

confidence: 99%

“…They developed the following equation for the critical film thickness. h normalc = 0.267 true( a f A H 2 6 π γ Δ p true) 1 / 7 The values of h c usually lie between 20 and 60 nm. A stochastic distribution of h c is always observed. , …”

Section: General Theorymentioning

confidence: 99%

Coalescence of Bubbles and Stability of Foams in Brij Surfactant Systems

Samanta

Ghosh

2011

Ind. Eng. Chem. Res.

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“…On the other hand, it is known in literature that the bubble coalescence stability can depend significantly on the foam film size [20,[23][24][25][26]. In the study of Gurkov et al [23] the stability of foam films stabilized by surfactants at low concentrations was studied. It was shown that the film lifetime increases with the film radius, due to the increasing drainage time of the foam films with the increase of the film radius [23].…”

Section: Introductionmentioning

confidence: 99%

“…In the study of Gurkov et al [23] the stability of foam films stabilized by surfactants at low concentrations was studied. It was shown that the film lifetime increases with the film radius, due to the increasing drainage time of the foam films with the increase of the film radius [23]. In contrast, it was shown by Khristov et al [26] that the critical capillary pressure, required for foam film rupture, decreases with increasing the film radius from 0.2 to 2 mm for SDS stabilized foam films.…”

Section: Introductionmentioning

confidence: 99%

Factors affecting the coalescence stability of microbubbles

Pagureva

Rusanova

Denkov

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Table 2 shows the average molecular weight and the polydispersity index (PDI), obtained by GPC, of the surfactants employed in this study and their similar structures based on suppliers' information and patents [42,43]. In addition, the CMC values determined from the curve of surface tension vs. concentration of surfactant are shown.…”

Section: Characterization Of Surfactantsmentioning

confidence: 99%

Influence of polymerizable surfactants on the adhesion performance and water resistance of water-based acrylic pressure-sensitive adhesives (PSAs)

Márquez

Paredes²,

Alarcia

et al. 2022

Journal of Adhesion Science and Technology

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The behavior of different polymerizable surfactants was investigated to improve the water-resistance of pressure-sensitive adhesives (PSAs) based on acrylic acid (AA) and n-butyl acrylate (n-BA). Differences in the adhesion properties were found according to the chemical structure and the critical micelle concentration of the polymerizable surfactant, especially when compared to the nonpolymerizable reference surfactant (Dowfax 2A1). The polymerizable surfactants with a branched structure resulted in more gel content and higher glass transition temperature in the adhesive. In general, the peel resistance and tack properties decreased with the use of polymerizable surfactants in the PSA formula. However, increased shear resistance was observed with respect to the PSA adhesive synthesized with the reference surfactant. Furthermore, the adhesives made with higher molecular weight polymerizable surfactants resulted in higher shear elastic modulus, shear strength, and deformation energy than the rest of the PSA adhesives. On the other hand, as expected, all the polymerizable surfactants studied contributed to the improved water resistance of the PSA compared to the reference PSA prepared with a conventional surfactant. The covalent bond formed between the polymer and the surfactant limited the migration of the surfactant towards the air-film interface thus reducing the formation of water entry pathways. The polymerizable surfactants with linear molecular structure showed the best water resistance performance.

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Statistics of rupture in relation to the stability of thin liquid films with different size

Cited by 9 publications

References 18 publications

Coalescence of Bubbles and Stability of Foams in Brij Surfactant Systems

Coalescence of Bubbles and Stability of Foams in Brij Surfactant Systems

Factors affecting the coalescence stability of microbubbles

Influence of polymerizable surfactants on the adhesion performance and water resistance of water-based acrylic pressure-sensitive adhesives (PSAs)

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