Interaction forces in thin liquid films stabilized by hydrophobically modified inulin polymeric surfactant. 2. Emulsion films

Langmuir : the ACS Journal of Surfaces and Colloids
D ExerowaT F Tadros

Abstract

The interaction forces in emulsion films stabilized using hydrophobically modified inulin (INUTEC SP1) were investigated by measuring the disjoining pressure of a microscopic horizontal film between two macroscopic emulsion drops of isoparaffinic oil (Isopar M). A special measuring cell was used for this purpose whereby the disjoining pressure Pi was measured as a function of the equivalent film thickness hw. The latter was determined using an interferometric method. In this way Pi-hw curves were established at a constant INUTEC SP1 concentration of 2x10(-5) mol.dm-3 and at various NaCl concentrations. At a constant disjoining pressure of 36 Pa, a constant temperature of 22 degrees C, and a film radius of 100 microm, hw decreased with an increase in the NaCl concentration, Cel, and reached a constant value of 11 nm at Cel=5x10(-2) mol.dm-3. This reduction in film thickness is due to the compression of the electrical double layer, and at the above critical NaCl concentration any electrostatic repulsion is removed and only steric interaction remains. This critical electrolyte concentration represents the transition from electrostatic to steric interaction. At a NaCl concentration of 2x10(-4) mol.dm-3 the Pi-hw isotherms showed a ...Continue Reading

Citations

May 28, 2011·Advances in Colloid and Interface Science·G GotchevD Exerowa
Mar 8, 2011·Advances in Colloid and Interface Science·Tharwat Tadros
Aug 13, 2010·Journal of Colloid and Interface Science·Yoon Sung NamHan Kon Kim
Apr 23, 2015·Advances in Colloid and Interface Science·Tharwat Tadros
Dec 2, 2008·Advances in Colloid and Interface Science·Tharwat Tadros
Oct 22, 2008·Advances in Colloid and Interface Science·D Exerowa, Dimo Platikanov
Oct 24, 2007·Journal of Colloid and Interface Science·Walkíria RibeiroBenilde Saramago
Sep 2, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Jiebin BiZhenghe Xu
May 8, 2008·Advances in Colloid and Interface Science·Brian Vincent

Related Concepts

Polymorphism, Crystallization
Emulsions
Inulin
Polymers
Tensides
X-Ray Diffraction
Spectroscopy, Fourier Transform Infrared
Hydrophobicity

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