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Effect of surfactant dispersed in oil on interaction force between an oil film and a steel substrate in water

Kumar, Deepak and Biswas, Sanjay K (2011) Effect of surfactant dispersed in oil on interaction force between an oil film and a steel substrate in water. In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, 377 (1-3). pp. 195-204.

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Official URL: http://dx.doi.org/10.1016/j.colsurfa.2010.12.049

Abstract

The oil phase, in an oil-in-water emulsion on a steel substrate, is strongly repelled by the substrate. The oil in this situation does not wet the steel and steel/steel friction is high. In this work we disperse anionic surfactants in an oil film and study the effect of this dispersion on the force of interaction between a silica colloid probe (AFM) carrying the oil film and a steel substrate in water. It is observed that when the surfactant is oil insoluble and the interaction time is short the strong entropic repulsion (without the surfactant) is replaced by a strong attraction. The steel on steel sliding friction in this case is low compared to that what is achieved when the surfactant is soluble in oil. The rationale underlying these interactions is explored here. (C) 2011 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science B.V.
Keywords: Disjoining thin water film;Physical forces;Oil/water soluble surfactant;O/W emulsion
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 12 Apr 2011 06:52
Last Modified: 12 Apr 2011 06:52
URI: http://eprints.iisc.ernet.in/id/eprint/36758

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