Drainage of foam films stabilized by n-dodecyl-β-d-maltoside or dodecyl trimethylammonium bromide and their mixtures

Ivanova, Dilyana S.; Angarska, Zh. K.; Karakashev, Stoyan I.; Manev, Emil D.

doi:10.1016/j.colsurfa.2011.01.058

Cited by 7 publications

(3 citation statements)

References 34 publications

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“…The surfactant concentration was equal to critical micelle concentration (CMC), because in this case, the adsorption layers are filled. The solution with C 12 G 2 + 0.1M NaBr has a surfactant concentration of 1.5 × 10 −4 M and surface tension of 33.8 mN/m [16]; solution with C 12 TAB + 0.1 M NaBr has a surfactant concentration of 4.2 × 10 −3 M [16] and surface tension of 35.2 mN/m.…”

Section: Experimental Conditionsmentioning

confidence: 99%

Influence of the Hamaker Constant on the Value of the Critical Thickness of Foam Films

Ivanova

2019

Coatings

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The aim of the present study was to check the influence of the Hamaker constant (A(h)) on the calculated critical thickness of foam films. It was done by a comparison between the experimental data of the critical thickness and the theoretically obtained data with different values of (A(h)), which take part in the equations of Radoev, Scheludko, Manev, and Vrij. We calculated the latter for film thicknesses from 15 to 70 nm based on several equations. We used the experimental data of hcr (average value of critical thickness and measured once, in the place of a spot appearance) for foam films stabilized by non-ionic surfactant n-dodecyl-β-D-maltoside (C12G2) or by cationic surfactant n-dodecyl trimethylammonium bromide (C12TAB), as measured by the interferometric method. The foam films were produced from solutions with surfactant concentration at CMC (Critical Micelle Concentration) in the presence of 0.1 M NaBr. For films of C12G2, the best correspondence was found between measured hcr (in the spot) and calculated ones by the RShM equation using effective A(h) (introduced by Coons et al.) or Vassilieff’s values, but with a correction for the added electrolyte. For films stabilized by C12TAB, a difference between the measured and theoretically calculated hcr was found, which was probably due to the nature of the surfactant. Nevertheless, this difference was smallest when calculated hcr values were obtained with data for Aeff (h) and Vassilieff’s A(h) constant, respectively.

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Section: Experimental Conditionsmentioning

confidence: 99%

Influence of the Hamaker Constant on the Value of the Critical Thickness of Foam Films

Ivanova

2019

Coatings

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“…It is the averaged film thickness in its critical state which could be a thickness of rupture h br or thickness of black spor formation in the film h bl . It can be measured interferometrically [2][3][4][5], or calculated on the bases of equations suggested in the literature [6][7]. A new procedure for determination of critical thickness by interferometric method from film evolution video has been suggested in [8][9].…”

Section: Introductionmentioning

confidence: 99%

“…In practice it is achieved by using mixtures of surfactants with proven positive synergism. In the studies of equilibrium properties [1][2] and the kinetic stability [3][4][5] of foam films (FF) during the last years are used mixtures of surfactants. A subject of the presented study are foam films obtained from mixtures of the surfactants: n-dodecyl -D maltoside (C 12 G 2 or G 2 ); hexaethyleneglycol dodecyl ether (C 12 Е 6 or E 6 ); dodecanol (C 12 E 0 or E 0 ); dodecyl trimethylammonium bromide (C 12 TAB or TAB) at wide varied DOI: 10.1515/asn-2016-0007 ©2016 "K.Preslavsky"University of Shumen.…”

Section: Introductionmentioning

confidence: 99%

Critical thickness of foam films stabilized by nonionic, ionic surfactants and their mixtures

Ivanova

Angarska

Manev

2016

Acta Scientifica Naturalis

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The critical thickness (hcr) for foam films of n-dodecyl β-D maltoside (C12G2) and of its mixed solutions with dodecanol (C12Е0), hexaethyleneglycol dodecyl ether (C12E6) and dodecyl trimethylammonium bromide (C12TAB) of different molar ratio (50:1; 1:1;1:50) at low and high ionic strength was measured interferometrically. It was found that the hcr increases with the increase of the film radius independently of solutions composition. At low ionic strength the type of surfactant affects the critical thickness and the equilibrium state of the film. hcr for the films of mixture with C12E0 increases with the increase of the total surfactant concentration, while hcr for the films of mixture with C12TAB decreases. For the values of the critical thicknesses for films from individual surfactant solutions the following sequence hcr (C12TAB) > hcr (C12E6) > hcr (C12G2) is found. At high ionic strength the quantity of nonionic additive does not substantially affect the value of hcr, while the quantity of ionic additive influences it by two different ways (i) in 50:1 mixture C12TAB supports C12G2 in the reducing of negative charge; (ii) in 1:1 mixture C12TAB recharges the film surfaces.

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Thin liquid films: Where hydrodynamics, capillarity, surface stresses and intermolecular forces meet

Chatzigiannakis

Jaensson

Vermant

2021

Current Opinion in Colloid & Interface Science

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Drainage of foam films stabilized by n-dodecyl-β-d-maltoside or dodecyl trimethylammonium bromide and their mixtures

Cited by 7 publications

References 34 publications

Influence of the Hamaker Constant on the Value of the Critical Thickness of Foam Films

Influence of the Hamaker Constant on the Value of the Critical Thickness of Foam Films

Critical thickness of foam films stabilized by nonionic, ionic surfactants and their mixtures

Thin liquid films: Where hydrodynamics, capillarity, surface stresses and intermolecular forces meet

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