Structure of Foam Films Containing Additionally Polyelectrolytes

Klitzing, Regine von; Espert, A.; Colin, Annie; Langévin, D.

doi:10.1007/978-94-015-9157-7_4

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…From the disjoining pressure isotherms, one can extract the value of the surface potential in symmetric films (like foam films) but not the sign of the potential. However, the surface charge density can be estimated by eqn (3) and eqn (4). For instance, the addition of SDS leads to surface potentials up to 150 mV close to the cmc.…”

Section: Pure Surfactant Systemsmentioning

confidence: 99%

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Effect of polyelectrolyte/surfactant combinations on the stability of foam films

Kristen

Klitzing

2010

Soft Matter

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What happens if polymers are added to a macroscopic foam or to foam films? This is an important question for many technical applications, but it is also important for materials and life science. This paper reviews the effect of the surface composition on the thickness and stability of aqueous foam films containing surfactants and polymers. The surfactant concentration is below the critical micellisation concentration (cmc) and the critical aggregation concentration (cac). The addition of polymers to foam films leads to the formation of surface active polymer/surfactant complexes or to depletion of polymers close to the interfaces, which has a strong effect on the film stability. The review mainly concentrates on the dilute polymer regime (below the overlap concentration c*), and results at the semi-dilute regime (above c*) are briefly reviewed. A principle concept for the relation between the surfactant/polymer combination and the film thickness and stability is developed. It allows the prediction, of whether an unstable Newton black film (NBF) or a stable common black film (CBF) will be formed.

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Section: Pure Surfactant Systemsmentioning

confidence: 99%

“…4,8 This means that the interaction between the polyelectrolytes and surfactant molecules can be neglected with respect to their effect on structural forces. Fig.…”

Section: Stratification Phenomenamentioning

confidence: 99%

Effect of polyelectrolyte/surfactant combinations on the stability of foam films

Kristen

Klitzing

2010

Soft Matter

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“…The advantage of the statistical copolymer P(DADMAC-stat-NMVA) is that it is water soluble over the whole range of polymer charge density (0-100%) and that it produces foam films of a homogeneous thickness. In contrast to this polyelectrolyte, poly(styrene sulfonate sodium salt) (PSS) at a degree of charge below 60% induces gel-like aggregates in the films [122,155] (figure 12), which is due to hydrophobic parts along the polymer chain making it difficult to get reproducible (h) curves. However, the advantage of a statistical poly(styrene-stat-styrene sulfonate sodium salt) is that the (poly(styrene)) backbone does not change with variation of the charge density as is the case for P(DADMAC-stat-NMVA).…”

Section: 42mentioning

confidence: 99%

Disjoining pressure in thin liquid foam and emulsion films—new concepts and perspectives

Stubenrauch

Klitzing

2003

J. Phys.: Condens. Matter

291

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The present review is a topical survey of the disjoining pressure in thin liquid foam and emulsion films from both the experimental and the theoretical points of view. Section 2 deals with the latest research work on experimental techniques with which the disjoining pressure Π in foam, emulsion, and pseudo-emulsion films can be measured. Although a lot of techniques are available, the question of the origin of the charges at the water/air and the water/oil interfaces of films, which are stabilized by non-ionic surfactants, has not yet been answered. We address this question in section 3, reviewing the latest relevant literature. The relevance of structural forces for the disjoining pressure is outlined in section 4, which focuses on films which are stabilized by surfactant/polyelectrolyte mixtures.

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