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Surfactant-induced rigidity of interfaces: a unified approach to free and dip-coated films
Soft Condensed Matter · Submitted 19 Feb 2014
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Experimental data on the entrained film thickness in both configurations can be fitted very well using a single value of the surface elasticity, which is in good agreement with independent measurements by mean of surface expansion experiments in a Langmuir through.
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The behavior of thin liquid films is known to be strongly affected by the presence of surfactants at the interfaces. The detailed mechanism by which the latter enhance film stability is still a matter of debate, in particular concerning the influence of surface elastic effects on the hydrodynamic boundary condition at the liquid/air interfaces. In the present work, "twin" hydrodynamic models neglecting surfactant transport to the interfaces are proposed to describe the coating of films onto a solid plate (Landau-Levich-Derjaguin configuration) as well as soap film pulling (Frankel configuration). Experimental data on the entrained film thickness in both configurations can be fitted very well using a single value of the surface elasticity, which is in good agreement with independent measurements by mean of surface expansion experiments in a Langmuir through. The analysis shows how and when the soap films or dip coating experiments may be used to precisely and sensitively measure the surface elasticity of surfactant solutions.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The behavior of thin liquid films is known to be strongly affected by the presence of surfactants at the interfaces. | background 1.00 | 0.03 | 0.02 | asserted 1.00 |
| s1 | The detailed mechanism by which the latter enhance film stability is still a matter of debate, in particular concerning the influence of surface elastic effects on the hydrodynamic boundary condition at the liquid/air interfaces. | gap 0.97 | 0.03 | 0.03 | asserted 0.88 |
| s2 | In the present work, "twin" hydrodynamic models neglecting surfactant transport to the interfaces are proposed to describe the coating of films onto a solid plate (Landau-Levich-Derjaguin configuration) as well as soap film pulling (Frankel configuration). | method 0.67 | 0.93 | 0.08 | asserted 0.98 |
| s3 | Experimental data on the entrained film thickness in both configurations can be fitted very well using a single value of the surface elasticity, which is in good agreement with independent measurements by mean of surface expansion experiments in a Langmuir through. | result 1.00 | 0.92 | 0.60 | asserted 0.99 |
| s4 | The analysis shows how and when the soap films or dip coating experiments may be used to precisely and sensitively measure the surface elasticity of surfactant solutions. | interpretation 0.91 | 0.88 | 0.37 | hedged possibility 0.59 |
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Original abstract
The behavior of thin liquid films is known to be strongly affected by the presence of surfactants at the interfaces. The detailed mechanism by which the latter enhance film stability is still a matter of debate, in particular concerning the influence of surface elastic effects on the hydrodynamic boundary condition at the liquid/air interfaces. In the present work, "twin" hydrodynamic models neglecting surfactant transport to the interfaces are proposed to describe the coating of films onto a solid plate (Landau-Levich-Derjaguin configuration) as well as soap film pulling (Frankel configuration). Experimental data on the entrained film thickness in both configurations can be fitted very well using a single value of the surface elasticity, which is in good agreement with independent measurements by mean of surface expansion experiments in a Langmuir through. The analysis shows how and when the soap films or dip coating experiments may be used to precisely and sensitively measure the surface elasticity of surfactant solutions.
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For a $C_12 E_6$ solution at 3 cmc and $Ca ≈6 ×10^-5$, this total surface tension difference is found of the order of $1 mN/m$, which is small compared to the surface tension of usual surfactant solutions, but well in line with recent experimental work on surface tension gradients in soap films by Caps et al. [ref] .
Surface tension profiles in vertical soap films · Surface tension gradient · 0.82
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