Effect of Electrolyte on the Interfacial Dilational Properties of Sodium 4,5-Diheptyl-2-propylbenzene Sulfonate at the Oil-Water Interface

The dilational viscoelastic properties of 4,5-diheptyl-2-propylbenzene sulfonate (377) in the presence or absence of electrolyte were investigated by means of two methods: the interfacial tension response to sinusoidal area variations and the relaxation of an applied stress. The higher dilational mo...

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Bibliographic Details
Published in:Journal of dispersion science and technology 2009-01, Vol.30 (2), p.217-221
Main Authors: Zhang, Lei, Wang, Xiao-Chun, Gong, Qing-Tao, Luo, Lan, Zhang, Lu, Zhao, Sui, Yong-Yu, Jia
Format: Article
Language:English
Subjects:
4,5-Diheptyl-2-propylbenzene sulfonate
Chemistry
Colloidal state and disperse state
dilational modulus
dilational phase angle
electrolyte
Exact sciences and technology
General and physical chemistry
interface
relaxation process
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Summary:The dilational viscoelastic properties of 4,5-diheptyl-2-propylbenzene sulfonate (377) in the presence or absence of electrolyte were investigated by means of two methods: the interfacial tension response to sinusoidal area variations and the relaxation of an applied stress. The higher dilational modulus of 377 than ordinary surfactant indicates that the strength against perturbation of interfacial layer of the former is greater. This may due to the two long and flexible branched alkyl chains, which are easily cross-linked and entangled. Moreover, the results reveal that the added electrolyte results in screening of electrostatic interactions between the ionized groups, which decreased the interfacial dilational modulus.
ISSN:0193-2691
1532-2351
DOI:10.1080/01932690802498674