Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 261, Issue 1-3, Pages 65-73Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2004.11.044
Keywords
adsorption; surface tension; ionic surfactants; counterions; electric double layer
Categories
Ask authors/readers for more resources
An improved model of ionic surfactant adsorption was applied for description of CTABr (cetyltrimethylammonium bromide), CTACI and CTAHSO(4) surfactants adsorption from their aqueous solutions containing KCl and KBr at liquid/air interface. The model is based on the assumption that the surfactant ions and their counterions undergo non-equivalent adsorption within the Stern layer. The surface tension isotherms for various concentrations of surfactant ions and Br- and Cl- counterions were calculated and compared with the results of surface tension measurements performed by the pendant drop shape analysis methods. The dependences of surface excess values of all ions on CTA(+)/Br-/Cl- bulk concentrations were calculated. Obtained results showed much larger affinity to the interface of Br- anions than Cl- anions. This was explained in terms of a larger repulsion of chloride anions from the interface than bromide anions. It may be caused by the difference in their excess polarizability and the van der Waals interaction with the interface. (c) 2004 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available