Electrosurface properties of lysophosphatidylcholine foam films: Effect of pH and Ca2+

Cohen, R.; Exerowa, D.

doi:10.1016/0927-7757(94)02849-4

Cited by 30 publications

(36 citation statements)

References 23 publications

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“…The present study provides further evidence for the general phenomenon that surfaces of foam films stabilized by nonionic surfactants are charged. 1,6,[8][9][10]12,13,15,32,33 In the present work, the surface potentials are found to be c 0 ¼ 40 and 38 mV for c ¼ 2.5 Â 10 À4 and 5.0 Â 10 À4 M, respectively, which correspond to surface charge densities of q 0 ¼ 1.01 and 0.95 mC m À2 . The DLVO calculations are presented as solid lines in Fig.…”

Section: Disjoining Pressuresupporting

confidence: 49%

Correlation between film properties and the purity of surfactants

Schlarmann

Stubenrauch

Strey

2002

Phys. Chem. Chem. Phys.

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Section: Disjoining Pressuresupporting

confidence: 49%

Correlation between film properties and the purity of surfactants

Schlarmann

Stubenrauch

Strey

2002

Phys. Chem. Chem. Phys.

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“…At present, the widely accepted explanation for the origin of the charges is the specific adsorption of OH À ions at the water/ air interface, 1,4,10,[27][28][29] although the mechanism and thus the driving force for the ion adsorption is not completely clarified. In a recently proposed model 10 the specific adsorption of hydroxide ions is combined with image charge and dispersion forces on ions in the diffuse double layer.…”

Section: Discussionmentioning

confidence: 99%

A disjoining pressure study of n-dodecyl-β-D-maltoside foam films

Stubenrauch

Schlarmann

Strey

2002

Phys. Chem. Chem. Phys.

132

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The disjoining pressure P as function of film thickness h of aqueous n-dodecyl-b-D-maltoside (b-C 12 G 2 ) solutions has been measured using a newly assembled thin film pressure balance. The theoretical analysis of the experimental P(h) curves in terms of the DLVO theory confirms the existence of electrical charges and provides numerical values for their density at the water/air interface of this nonionic sugar surfactant system. The origin of the charges is discussed on the basis of a recently proposed adsorption model for OH À ions. The surface charge density is found to decrease with increasing surfactant concentration, to increase with increasing electrolyte concentration and stay constant in the range 4 < pH < 8. Furthermore, it is shown that the molecular structure of sugar surfactants has no influence on the magnitude of the long-range repulsive forces stabilizing the common black film. However, the structure influences the stability of the film as well as its ability to form a Newton black film. The good agreement between the results presented and those for nonionic alkyl polyglycol ethers (C i E j ) suggests a common origin of the properties of thin liquid films stabilized by nonionic surfactants.

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“…The surface charge density is also dependent on the type of salt used and on the pH (31). The origin of the charges is believed to be due to specific ion adsorption, and most authors claim that hydroxide ions are most important (34,35). Different mechanisms for the ion adsorption have been proposed.…”

Section: Thin Film Balance Measurementsmentioning

confidence: 98%