Foam, Emulsion and Wetting Films Stabilized by Polymeric Surfactants

Exerowa, D.; Platikanov, Dimo

doi:10.1002/9783527623884.ch6

Cited by 1 publication

(2 citation statements)

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“…At C el < 0.15 mol dm -3 NaCl, where the films formed from the mixture resemble those obtained from the LSP suspensions, a surface force component of steric origin can be inferred. 14 Such steric forces were previously found to be operative in foam films formed from lung surfactant fractions. 20,21 Lung surfactant is composed of more than 90% phospholipids and a few percent of specific hydrophobic proteins (SP-B and SP-C).…”

Section: Resultsmentioning

confidence: 92%

“…The effect of rhamnolipids on lung alveoli can be studied in vitro also using the free thin liquid film (foam film) method. As a model of studying surface forces operative between two interacting air/solution interfaces, the foam film has long been employed for corroborating important theoretical concepts. − Experimental studies conducted with black foam films formed from amniotic fluids and pulmonary surfactant solutions show that the horizontal microscopic black foam film, formed under the ambient conditions of the lung alveoli (capillary pressure, film radius, electrolyte concentration) can model the alveolar surface and stability. ,,− During the past decades, this model has demonstrated its advantages for solving some practical problems in medicine. − …”

Section: Introductionmentioning

confidence: 99%

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Effect of Rhamnolipids on Pulmonary Surfactant Foam Films

et al. 2010

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The effect of a rhamnolipid biosurfactant on pulmonary surfactant is studied employing the black foam film method. Pulmonary surfactant is modeled by a commercially available lung surfactant preparation (LSP). The effect of rhamnolipid concentration on the formation and stability of films formed from mixtures of LSP and rhamnolipids is experimentally studied by measurements of the probability W of formation of black foam films as a function of both LSP and rhamnolipid concentrations at the physiologically relevant electrolyte concentration C(el) = 0.15 mol dm(-3) NaCl. The obtained curves show that addition of rhamnolipid at a concentration C(RhL) = C(c) (critical concentration of black foam film formation) to LSP suspensions causes destabilization of the foam films. In this case, additional quantities of lung surfactant preparation are needed to obtain black films with probability W = 100%. Rhamnolipid adsorption and formation of mixed adsorbed layers at the solution/air interfaces of foam films formed from mixtures of lung surfactant and rhamnolipids are experimentally studied by monitoring the effect of electrolyte and rhamnolipid concentrations on the thickness h of the foam films. The incorporation of rhamnolipid ions in the adsorbed layers at the film interfaces is evidenced also by direct measurements of the disjoining pressure Pi in the films. The Pi(h) isotherms demonstrate that the added rhamnolipids change the surface electric parameters of the films and their thickness and stability at higher pressures. The obtained results show that the different molecular components in the mixture and the increased surface charge at the film interfaces originating from the rhamnolipid ions have a significant effect on the surface forces operative in the studied films.

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Section: Resultsmentioning

confidence: 92%