Influence of pH on colloidal properties and surface activity of polyglycerol fatty acid ester vesicles

Duerr-Auster, N.; Eisele, T.C.; Wepf, Roger; Gunde, R.; Windhab, Erich J.

doi:10.1016/j.jcis.2008.08.047

Cited by 23 publications

(31 citation statements)

References 21 publications

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“…In agreement with an earlier observation [14], surfactant adsorption occurs in a more rapid manner at low pH. This observation was related to the fact that PGE forms vesicles in dilute aqueous solution, which, due to an osmotic shock, are partially destroyed at low pH.…”

Section: Discussionsupporting

confidence: 92%

“…Comparison of the dynamic surfacetension profile at pH 3 and pH 7 shows that the coverage of the air/water interface occurs at a slightly higher rate at lower pH. This effect is in agreement with a previous observation made by us [14], where the osmotic stress imposed on PGE vesicles at low pH, causes them to partially open and hence allow for faster transport of PGE monomers to the interface.…”

Section: Properties Of Pge At the Air/water Interfacesupporting

confidence: 91%

“…The main objective of this study was to compare the bubble stability in dilute PGE solutions, and to test for any correlations with the surface properties of the surfactant at different ionic strength. This objective was based on the observation that PGE-foams show a different foaming efficiency and structural foam stability at different pH [14].…”

Section: Discussionmentioning

confidence: 99%

“…It is more likely that other factors, for example changes in surface-potential, are responsible for the difference in coalescence stability. An earlier study on the colloidal stability of dilute PGE dispersions [14] suggests that, despite being declared as non-ionic surfactant, the vesicle surface is charged at high pH, due to the presence of anionic fatty acid soaps. These molecules are residues of the industrial esterification reaction.…”

Section: Discussionmentioning

confidence: 99%

“…This surfactant is used for the production of food foams [13] and recently, it has been observed that an increase of the ionic strength of the solution positively influences foaming efficiency and stability [14]. To understand these macroscopic effects in more detail, and to find correlations between bubble stability and surface properties, binary coalescence experiments are carried out.…”

Section: Introductionmentioning

confidence: 99%

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Binary coalescence of gas bubbles in the presence of a non-ionic surfactant

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Section: Discussionsupporting

confidence: 92%

Section: Properties Of Pge At the Air/water Interfacesupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Binary coalescence of gas bubbles in the presence of a non-ionic surfactant

Duerr-Auster

Gunde

Mäder

et al. 2009

Journal of Colloid and Interface Science

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Polyglycerol Esters

Norn

2014

Emulsifiers in Food Technology

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Limiting coalescence by interfacial rheology: over-compressed polyglycerol ester layers

Gupta

Hooghten

Fischer³

et al. 2016

Rheol Acta

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The stabilisation of foam bubbles is of both scientific interest and technological importance. In this respect, the study of polyglycerol ester-based nonionic surfactants is highly relevant as they lead to remarkable foam stability. The present work investigates the thermodynamic and rheological properties leading to this stability with a particular focus on out-of-equilibrium conditions of the surface. These may occur after bubble coalescence events, which lead to a compression of the interface. To separate the effects of such a compression on surface tension and the extra stresses which arise due to deformation of the interface, a double wall ring geometry mounted in a ribbon trough was used. Surface tension and the linear viscoelastic properties are shown to be affected differently by compression of the surface. The surface tension relaxes to an equilibrium value while the surface moduli will continue to rise which each compression step. The presence of multilayered structures, which have been reported for polyglycerol esters, explains how these differences arise. The polyglycerol ester-based nonionic surfactants are an example of materials where a Jan Vermant

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Influence of pH on colloidal properties and surface activity of polyglycerol fatty acid ester vesicles

Cited by 23 publications

References 21 publications

Binary coalescence of gas bubbles in the presence of a non-ionic surfactant

Binary coalescence of gas bubbles in the presence of a non-ionic surfactant

Polyglycerol Esters

Limiting coalescence by interfacial rheology: over-compressed polyglycerol ester layers

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