ENTROPIES OF COMPRESSION OF CHARGED MONOLAYERS AT AQUEOUS INTERFACES.

J. Mingins, N. F. Owens, J. A.G. Taylor, J. H. Brooks, B. A. Pethica

Research output: Contribution to conferencePaperpeer-review

9 Scopus citations

Abstract

Entropies of compression calculated from surface pressure-area isotherms for anionic or cationic monolayers of the same chain length (18 carbons) that are spread at n-heptane/water (O/W) or air/water (A/W) interfaces or for their equimolar mixture at the O/W interface are negative. When plotted against the logarithm of the area they give two lines - one for the A/W interface and a steeper one for the O/W interface. As well as being independent of head group, the entropies do not depend on ionic strength. A model that treats the monolayer as an ensemble of discs that interact only through hard sphere and coulombic forces explains the size of the entropies at A/W but not at O/W where an extra chain-conformation term is needed.

Original languageEnglish (US)
Pages14-27
Number of pages14
StatePublished - Jan 1 1974
Eventfor Mem Symp to N. K. Adam, Monolayers, 168th Meet of Am Chem Soc - Atlantic City, NJ
Duration: Sep 11 1974Sep 13 1974

Conference

Conferencefor Mem Symp to N. K. Adam, Monolayers, 168th Meet of Am Chem Soc
CityAtlantic City, NJ
Period9/11/749/13/74

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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