Capillary Wave Damping in Heterogeneous Monolayers

Wang, Qingyu; Feder, Aryeh; Mazur, Eric

doi:10.1021/j100099a041

Cited by 20 publications

(21 citation statements)

References 4 publications

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“…Systematic study of capillary waves on thin film surfaces began in the late 60s of the previous century and since then a great number of relevant publications exists [38][39][40][41][42][43]. Artificial wave propagation in foams was studied specifically by Sun et al [44], bending mode in free films by Bergmann [45] and wetting films by Schulze et al [23,35].…”

Section: Acoustically Exited Surface Wavesmentioning

confidence: 99%

Wetting Film Dynamics and Stability

Radoev

Stöckelhuber

Tsekov

et al. 2007

Colloid Stability and Application in Pharmacy

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Although the wetting films are similar in many aspects to other thin liquid films, there are some differences in their behavior, too. In contrast to soap and emulsion films, whose surfaces are homogeneous, solid substrates of wetting films are heterogeneous as a rule, unless special measures for their homogenization are taken. Here we mean primarily heterogeneous distribution of surface energy leading to existence of hydrophobic domains on hydrophilic surfaces and vice versa. As is known, such hydrophobic domains could play the role of gasphase nucleation centers and it is widely accepted nowadays that nano-bubbles can be formed there. The present paper reviews the effect of nano-bubbles adhered at solid surface on stability of wetting films. It is shown that the existence of nano-bubbles is crucial for the lifetime of wetting films. Another peculiarity typical for hydrophobic solid surface, the so-called slippage effect, is also investigated and its contribution to the dispersion equation of capillary waves on wetting films is accounted for.Thin films, the building blocks of dispersed systems, are present mainly in three variants: soap, emulsion and wetting films. There are many equilibrium and dynamic characteristics typical for all these kinds of films, e.g. the surface DLVO forces acting therein, the type of hydrodynamics in the films (the so-called lubrication flow), the equilibrium and stability conditions, film rupture, etc. However, besides their common nature each kind of films mentioned above possesses specific features, which should be taken into account when interpreting the corresponding experimental data and their influence on the behavior of dispersed systems. The subject of this paper is to review some of the peculiarities, related to the rheology, stability and rupture of wetting films. As is shown, all phenomena observed are due to effects characteristic of solid/liquid surfaces. A section is devoted to the hydrodynamics of wetting films with special attention paid to a new experimental method for exciting and measuring surface waves on wetting films. Among the most interesting results obtained by this method is the anomalous high slippage observed on solid surfaces. Presence of nano-bubbles adhered at solid/liquid surface is suggested as a possible origin of this effect. The idea of the existence of nano-bubbles in wetting films appears again in the last section as a cause for the film rupture. The detailed analysis shows that the region above a nano-bubble resembles more a foam film, which is unstable as a rule, thus explaining why wetting films with repulsive interactions could also rupture.

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Section: Acoustically Exited Surface Wavesmentioning

confidence: 99%

Wetting Film Dynamics and Stability

Radoev

Stöckelhuber

Tsekov

et al. 2007

Colloid Stability and Application in Pharmacy

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“…3. However, bearing in mind the high accuracy of the measurements of the wavelength which can be achieved with the use of modern experimental methods, [8][9][10][11][12] it is easy to reveal a noticeable influence of the multiple scattering.…”

Section: ͑34͒mentioning

confidence: 99%

“…8 On the other hand, recent studies have shown high sensitivity of the capillary wave characteristics to the surface rheological properties and made possible the use of the cap-illary wave method in the investigation of heterogeneous insoluble monolayers. [8][9][10][11][12][13][14] According to some authors, 8,11 one of the obstacles to this is the absence of an adequate theory of surface wave propagation in systems with tangentially heterogeneous interface. However, this is not quite correct: The first theoretical study of the surface wave scattering by two-dimensional viscoelastic particles appeared several years ago.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic properties of heterogeneous surface films: Multiple scattering of capillary waves

Noskov

1998

The Journal of Chemical Physics

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“…Experiments on capillary wave propagation at fluid-gas interfaces covered with surfactants can show a dramatic increase in the damping rate of the surface capillary waves. [10][11][12][13][14][15] In these experiments, a wave maker generates a capillary wave and either the dispersion relation, wave amplitude, or the width of the spectral peaks generated from light scattering of a thermally fluctuating interface, is measured, and the damping coefficient characterizing the attenuation of the interface deformation is extracted. The damping coefficient is observed to depend on the surface coverage and appears to have a maximum near the regime where surface phases coexist.…”

Section: Introductionmentioning

confidence: 99%

Capillary wave scattering from a surfactant domain

1995

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The study of capillary wave scattering by a circular region with different interfacial properties from the rest of an otherwise homogeneous interface is motivated by experiments on wave attenuation at a monolayer-covered air–water interface where domains of one surface phase are dispersed in a second surface phase. Here the scattering function is calculated for an incident wave of frequency ω (wavevector k0) scattering from an isolated circular domain of radius a with surface tension σ1 which is imbedded in an otherwise infinite interface of surface tension σ0. The underlying fluid is treated as irrotational and the three-dimensional flow problem coupling the heterogeneous surface to the underlying liquid is reduced to a set of dual integral equations, which are solved numerically. With this solution the scattering amplitudes and the total scattering cross sections are calculated as a function of the surface tension ratio σ0/σ1 and incident wavenumber k0a. The analogous problem of a discontinuous change in bending rigidity is also considered and the solution to the complete viscous problem is outlined in the Appendix. Experimental implications of these results are discussed.

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Capillary Wave Damping in Heterogeneous Monolayers

Cited by 20 publications

References 4 publications

Wetting Film Dynamics and Stability

Wetting Film Dynamics and Stability

Dynamic properties of heterogeneous surface films: Multiple scattering of capillary waves

Capillary wave scattering from a surfactant domain

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