Comparison of spread monolayers and adsorbed monolayers at an n-heptane/aqueous sodium chloride interface

J. H. Brooks, B. A. Pethica

Research output: Contribution to journalReview article

19 Scopus citations

Abstract

Relationships have been determined between film pressure and bulk concentration for dodecyl trimethylammonium bromide and for sodium dodecyl sulphate in a n-heptane/0.1 M aqueous sodium chloride system at 20°C. The results obtained by means of the dipping-plate technique conflict with previously reported results from drop-volume measurements. Relationships between film pressure and area per molecule for adsorbed monolayers were derived by means of the Gibbs equation. Excellent agreement was found for the force-area relations of spread and adsorbed films of the same head-group, confirming the earlier finding that these relations are independent of chain length. The insoluble-monolayer technique thus provides an accurate criterion of the reliability of interfacial tension-concentration data for soluble films.

Original languageEnglish (US)
Pages (from-to)571-576
Number of pages6
JournalTransactions of the Faraday Society
Volume61
DOIs
StatePublished - Jan 1 1965
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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