New Methods for Studying Foams: Foaminess and Foam Stability

Русанов, А. И.; Krotov, V. V.; Nekrasov, A. G.

doi:10.1006/jcis.1998.5697

Cited by 18 publications

(7 citation statements)

References 4 publications

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“…In this way, the evolution time can be found from experiment. The experimental setup and results have been described elsewhere. , The investigation discovered a maximum of the evolution time near the critical micelle concentration (cmc) for the foam prepared from the sodium dodecyl sulfate (SDS) solution (Figure ). Similar observations of peaks of the foam stability were still earlier reported in the literature , as obtained by traditional measuring the foam-column height decrease in time.…”

Section: Introductionmentioning

confidence: 99%

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Extremes of Some Foam Properties and Elasticity of Thin Foam Films near the Critical Micelle Concentration

2004

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The elasticity of open and closed thin foam films is analyzed. The elasticity modulus of a closed film is shown to be additive with respect to contributions from Gibbs elasticity and disjoining pressure. A detailed expression for the film elasticity modulus explains the pronounced maxima of foaminess and foam stability near the critical micelle concentration observed earlier in many experiments. A theory of transversal elasticity of thin foam films is formulated under conditions excluding the action of Gibbs elasticity. Near the critical micelle concentration, the theory predicts maxima of the transversal elasticity modulus and of the films thickness as functions of concentration at a given disjoining pressure. The prediction has been verified experimentally by measuring the film thickness in equilibrium foam as a function of height.

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Section: Introductionmentioning

confidence: 99%

“…Additional data were obtained , from studying the dense bubble monolayer on the surface of the SDS solution. The bubble monolayer can be regarded as a kind of two-dimensional foam, but, in any case, is an object of a specific interest in colloid science.…”

Section: Introductionmentioning

confidence: 99%

Extremes of Some Foam Properties and Elasticity of Thin Foam Films near the Critical Micelle Concentration

2004

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“…The results are presented in Figures 1 and 2, where well pronounced maxima can be seen near the CMC, as predicted by the above theory. It is of interest that the maxima are located approximately at the same place on the concentration axis as the maxima of foaminess and foam stability, [1][2][3] although the mechanism of elasticity is different for closed and completely open (as in this work) films. These similar locations of the maxima are explained by the leading role of the CMC in both the cases.…”

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confidence: 77%

“…Earlier, [1][2][3] we reported experimental evidences for the sharp maxima of foaminess and foam stability near a critical micelle concentration (CMC). The explanation was given only recently 4 by analysing the behaviour of the film elasticity modulus as a function of concentration.…”

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confidence: 95%

Direct measurement of the transversal elasticity modulus of foam films

Русанов

Krotov

Nekrasov

2004

Mendeleev Communications

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“…As the film elasticity modulus is responsible for the foam stability, one can expect a maximum of foaminess and the foam stability near the critical micelle concentration. Observations of this kind were reported previously, [7][8][9][10][11] but no explanation of this phenomenon was given until now. We can see that the above theory satisfactorily explains the existence of maxima for foaminess and foam stability.…”

mentioning

confidence: 94%