The surface pressure of ionized monolayers

G. M. Bell, S. Levine, B. A. Pethica

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


It is shown that the commonly accepted relation ΔΠ = ∫0ψo for the increase in surface pressure resulting from the charging of a monolayer is not general. The surface pressure increase also includes a term relating to the change of the " non-electrostatic " contribution to the surface free energy. An important part of this additional term originates in the fluctuation or "self-atmosphere" electrostatic potential at an ion in the monolayer and may also be described as the "discreteness-of-change" contribution. The use of two-dimensional equations of state for ionized films as a way of investigating the properties of the ionic double layer is briefly considered.

Original languageEnglish (US)
Pages (from-to)904-917
Number of pages14
JournalTransactions of the Faraday Society
StatePublished - 1962
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Engineering
  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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