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Interactions of hydrocarbon monolayer surfaces across N-alkanes: A steric repulsion
YKI – Ytkemiska institutet. KTH Royal Institute of Technology, Sweden.
Australian National University, Australia.
Australian National University, Australia.
1989 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 90, 5801-5805 p.Article in journal (Refereed)
Abstract [en]

We present results of force measurements between hydrocarbon monolayer surfaces across n-alkanes (hexane, decane, and tetradecane). The interaction id qualitatively different from that of any previously system and, in particular, bears no resemblance to an oscillatory solvation force. Instead, the force is repulsive from about 2.5 nm, with the exeption of a shallow minimum just outside a force maximum at 0.8-0.9 nm. At smaller separations the force becomes attractive and there is a waek adhesion at contact. We suggest that the force law is due to a steric effect____a repulsive interaction originating in restrictions on chain conformations of the alkanes at small surface separations. This interaction is acessible via simple mean-field theories. The similarity of the liquid-liquid and liquid-surface interactions allows this to dominate over solvation effects. The results are of significance for interaggregate interactions in lamellar liquid crystals, microemulsions, and surfactant- stabilized dispersions.

Place, publisher, year, edition, pages
1989. Vol. 90, 5801-5805 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26648OAI: oai:DiVA.org:ri-26648DiVA: diva2:1053651
Note
A614Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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