Simultaneous diffusion of ions and ion pairs across liquid membranes

M. E. Duffey, D. Fennell Evans, E. L. Cussler

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


The flux of tetrabutylammonium nitrate (Bu4 NNO3) across a liquid membrane of n-heptyl cyanide varies with the salt concentrations in dilute solution, but with the concentration squared in more concentrated solution. The results are consistent with a mechanism which includes parallel diffusion of ions and ion pairs. This type of behavior, which will be common in homogeneous membranes of low dielectric constant, is a form of facilitated diffusion in which the salt acts as its own carrier.

Original languageEnglish (US)
Pages (from-to)1-14
Number of pages14
JournalJournal of Membrane Science
Issue number1
StatePublished - 1978
Externally publishedYes

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