Foam and wetting films: electrostatic and steric stabilization

Exerowa, D.; Churaev, N. V.; Kolarov, T.; Ng, Esipova; Panchev, N.; Zorin, Z. M.

doi:10.1016/s0001-8686(03)00033-2

Cited by 80 publications

(41 citation statements)

References 36 publications

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“…The critical thickness for rupturing of water films on quartz is found to be about 40 AE 10 nm. 71 Critical thicknesses found in literature for similar salt solutions like in the present study are about 75 nm for 5 Â 10 À4 M NaCl on quartz 37 and for KCl films on polished vitreous silica. 31,72,73 These findings agree with the critical thicknesses observed in the present work.…”

Section: Aqueous Wetting Film Stabilitiessupporting

confidence: 59%

Correlation between specific ion adsorption at the air/water interface and long–range interactions in colloidal systems

Schelero

Klitzing

2011

Soft Matter

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Specific ion effects are of high impact in colloid science and dominate processes in aqueous systems from protein folding or precipitation to ordering of particles or macromolecules in bulk solutions. Due to the large internal interface of colloidal systems especially interfacial ion effects are of importance. This paper presents a new insight into the specific ion effects at the air/water interface of monovalent electrolyte solutions and their consequences for long-range interactions in colloidal systems. Solely, in an asymmetric film (i.e. wetting film) one can determine the sign and precise value of the surface potential of the free air/water surface. It is shown that the all over charges of the interfacial region, which are affected by the type of ion, dominate the interfacial forces even over several tens of nm. This is of interest for tailoring the stability of colloidal systems. It is clearly shown that the air/water interface is negatively charged and that both anions and cations affect the surface potential even at very low electrolyte concentrations (10 À4 M).

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Section: Aqueous Wetting Film Stabilitiessupporting

confidence: 59%

Correlation between specific ion adsorption at the air/water interface and long–range interactions in colloidal systems

Schelero

Klitzing

2011

Soft Matter

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“…In our previous investigation [2] we found thick wetting films on silica formed from an aqueous solution of the triblock copolymer 'Pluronic F127' (PEO 99 -PPO 65 -PEO 99 ). In contrast with [3][4][5], we observed a pronounced increase of the thickness upon increasing of the NaCl concentration at a constant hydrostatic pressure [2]. This observation was rather unexpected; firstly, because electrostatic repulsion diminishes upon increase electrolyte concentration, secondly, because the amount of adsorbed F127 at silica was shown to decrease with increasing NaCl concentration.…”

Section: Introductioncontrasting

confidence: 67%

Thinning of wetting films formed from aqueous solutions of non-ionic surfactant

Eliseeva¹,

Fokkink²,

Besseling³

et al. 2006

Journal of Colloid and Interface Science

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“…Only the latter type of films is relevant to the present work. As shown, the metastable film reaches a quasi-equilibrium state [55] with a constant thickness (H) before rupture. By assuming that the refractive index of the film is equal to that of the bulk aqueous solution of the film (that is, the film has a homogeneous optical structure), we reported the H values as the equivalent solution film thicknesses without correction for surfactant layers adsorbed at the film surfaces An expression for the equivalent solution film thickness can be found in Ref.…”

Section: Film Thickness Measurementmentioning

confidence: 88%