Electrostatic and steric interactions in oil-in-water emulsion films from Pluronic surfactants

Advances in Colloid and Interface Science
G GotchevDotchi Exerowa

Abstract

Stabilization of oil-in-water emulsion films from PEO-PPO-PEO triblock copolymers is described in terms of interaction surface forces. Results on emulsion films from four Pluronic surfactants, namely F108, F68, P104 and P65 obtained with the Thin Film Pressure Balance Technique are summarized. It is found that film stabilization is due to DLVO (electrostatic) and non-DLVO (steric in origin) repulsive forces. The charging of the oil/water film interfaces is related to preferential adsorption of OH(-) ions. This is confirmed by pH-dependent measurements of the equivalent film thickness (h(w)) at both constant capillary pressure and ionic strength. With reducing pH in the acidic region, a critical value (pH(cr,st)) corresponding to an isoelectric state of the oil/water film surfaces is found where the electrostatic interaction in the films is eliminated. At pH≤pH(cr,st), the emulsion films are stabilized only by steric forces due to interaction between the polymer adsorption layers. Disjoining pressure (Π) isotherms measured for emulsion films from all the four Pluronic surfactants used at pH<pH(cr,st) show a transition to a Newton black film with increasing Π. The experimental data before the NBF-transition in the disjoining pres...Continue Reading

References

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May 17, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Dotchi ExerowaTharwat Tadros
Feb 7, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Cosima StubenrauchDotchi Exerowa
Feb 7, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Dotchi ExerowaTh F Tadros

Citations

Apr 4, 2015·International Journal of Pharmaceutics·Robert Damitz, Anuj Chauhan
Jul 15, 2015·Advances in Colloid and Interface Science·Masami Kawaguchi
May 12, 2012·Journal of Colloid and Interface Science·Pablo RamírezR Miller
Nov 26, 2013·Advances in Colloid and Interface Science·Amelia Torcello-GómezJulia Maldonado-Valderrama
Feb 22, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Ofer ManorRaymond Riley Dagastine
Apr 1, 2014·Advances in Colloid and Interface Science·V DutschkV M Starov
Jul 22, 2019·The Science of the Total Environment·Jared ChurchDanielle M Paynter

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