Gibbs Elasticity of a Soap Bubble

Bianco, Havazelet; Marmur, Abraham

doi:10.1006/jcis.1993.1260

Cited by 18 publications

(7 citation statements)

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“…The results are consistent with measurements reported in [28,29], which measured the sur face tension by means of stalagmometric methodology and the pendant drop method, respectively. Our result is slightly lower than that found by Bianco et al [14] using the dynamic maximum pressure method and by Sane et al [30] who mea sured the surface tension of flowing soap films. The values of surface tensions reported there are approximately 30 mN m −1 for SDS solutions in the saturated range.…”

Section: Discussioncontrasting

confidence: 79%

“…In this method [14,[16][17][18][19], on the other hand, the pressure differences are very small for bubbles with reasonable sizes, hence it is not easy to reach high accuracy in pressure mea surements. In addition, as equation ( 1) indicates, the pressure difference decreases as bubble grows, which makes it difficult to generate a bubble and maintain it at desired size.…”

Section: Introductionmentioning

confidence: 99%

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A laminar-jet-discharging method for measuring the interfacial tension of deformable surfaces

Wan¹,

Xiang²,

Xu³

2019

Meas. Sci. Technol.

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We propose a laminar-jet-discharging method to measure the interfacial tension of deformable surfaces such as soap bubbles. This method avoids the need to measure the small pressure difference inside and outside a soap bubble in a static state. By allowing the air in a soap bubble to discharge in a laminar flow state through a long tube, we show that the surface tension of the soap bubble is proportional to the rate of change of the fourth power of the bubble radius. Experimentally, we verify that this linear relationship is valid over a long period and thus can be measured with cameras at slow recording rates. Our method offers a straightforward and accurate way to measure the surface tension of soap bubbles using easy-to-obtain devices. In addition, we propose a new development of the pendant drop method based on the silhouette of the drop, which does not require any pressure transducer or computation of the second-order derivatives of the drop profile and hence is easier to implement and less sensitive to the accuracy of the drop profile determination. For pure liquids, results from the new pendant drop method compare well with standard values. This method is thus used to verify the laminar-jet-discharging measurements.

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Section: Discussioncontrasting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

A laminar-jet-discharging method for measuring the interfacial tension of deformable surfaces

Wan¹,

Xiang²,

Xu³

2019

Meas. Sci. Technol.

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“…A new method for measuring the Gibbs elasticity was proposed by Bianco and Marmur, who used a soap bubble formed at the tip of a capillary instead of a planar film, thus limiting the contact area with the surfactant solution and therefore minimising the transfer. 16 A more sophisticated apparatus was constructed by Wasan and coworkers who were able to study foam and emulsion films. 17 Despite the interest of these measurements, no detailed correlation has yet been made between film elasticity and foam stability.…”

Section: Introductionmentioning

confidence: 99%

Link between surface elasticity and foam stability

Cagna²,

2009

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We have measured the surface dilational elastic moduli of bubbles immersed in water and soap bubbles in air. The short time response was obtained by submitting the bubbles to a rapid expansion after which the surface tension evolution was monitored, using either image analysis or pressure measurements. It was possible with this method to measure directly the Gibbs elasticity. The longer time response was obtained by submitting the bubbles to low frequency oscillations. Experiments were performed with solutions of non-ionic surfactants, C 12 E 6 , C 12 G 2 , their 1:1 mixture, Pluronic F-68 and 127 and the surface elastic moduli were compared with the stability of foams made with these surfactants. The foams evolve with time, first by Ostwald ripening, controlled by the low frequency elasticity, and then by bubbles coalescence, controlled by the high frequency elasticity.

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“…The Gibbs elasticity must therefore be measured in situ, in the foam film. The film tension variations induced by a film stretching have been measured in a vertical film by comparison with gravitational forces [8][9][10] , or deduced from the Laplace pressure in spherical bubbles 7,11,12 . An alternative is to measure the tension in the film of interest by comparison to the tension in neighboring films, connected to the first one along a meniscus 13,14 .…”

Section: Introductionmentioning

confidence: 99%

“…The film tension variations induced by a film stretching have been measured in a vertical film by comparison with gravitational forces, [8][9][10] or deduced from the Laplace pressure in spherical bubbles. 7,[11][12][13] An alternative is to measure the tension in the film of interest by comparison to the tension in neighboring films, connected to the first one along a meniscus. 14,15 Measuring the film extension requires a welldefined closed material system to be followed during its deformation.…”

Section: Introductionmentioning

confidence: 99%