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Liquid membrane potential in nonisothermal systems.

G Scibona, C Fabiani, B Scuppa

    Biophysical Journal
    |June 1, 1976
    PubMed
    Summary
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    New electrical membrane potential equations were derived for liquid ion exchange membranes, accounting for uncharged species and co-ion exclusion. These equations, based on irreversible thermodynamics, were validated experimentally, advancing membrane science.

    Area of Science:

    • Physical Chemistry
    • Membrane Science
    • Electrochemistry

    Background:

    • Liquid ion exchange membranes are crucial in separation processes.
    • Existing theories for solid membranes do not fully capture liquid membrane complexities.
    • Understanding electrical potential in these systems is key to optimizing their performance.

    Purpose of the Study:

    • To derive comprehensive electrical membrane potential equations for liquid ion exchange membranes.
    • To extend irreversible thermodynamic theories to liquid membranes with uncharged associated species.
    • To experimentally validate the derived theoretical models.

    Main Methods:

    • Extended irreversible thermodynamic theories to liquid membranes.
    • Formulated dissipation function considering all species' fluxes.

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  • Integrated electrical membrane potential equations under isothermal and nonisothermal conditions.
  • Experimental validation using tetraheptylammonium salt liquid membranes.

    • Main Results:

    • Derived novel electrical membrane potential equations for liquid ion exchange membranes.
    • Identified contributions of mobile charged sites, counterions, and uncharged species to membrane potential.
    • Demonstrated good agreement between theoretical predictions and experimental results.
    • Validated the extended thermodynamic framework for liquid membrane systems.

    Conclusions:

    • The derived equations accurately describe electrical potentials in liquid ion exchange membranes.
    • Irreversible thermodynamics provides a robust framework for understanding these complex systems.
    • The study advances the theoretical and experimental understanding of ion transport in liquid membranes.