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The Donnan potential revealed

Author

Listed:
  • Pinar Aydogan Gokturk

    (Lawrence Berkeley National Laboratory)

  • Rahul Sujanani

    (The University of Texas at Austin)

  • Jin Qian

    (Lawrence Berkeley National Laboratory
    Lawrence Berkeley National Laboratory)

  • Ye Wang

    (Lawrence Berkeley National Laboratory
    Lawrence Berkeley National Laboratory)

  • Lynn E. Katz

    (The University of Texas at Austin)

  • Benny D. Freeman

    (The University of Texas at Austin)

  • Ethan J. Crumlin

    (Lawrence Berkeley National Laboratory
    Lawrence Berkeley National Laboratory)

Abstract

Selective transport of solutes across a membrane is critical for many biological, water treatment and energy conversion and storage systems. When a charged membrane is equilibrated with an electrolyte, an unequal distribution of ions arises between phases, generating the so-called Donnan electrical potential at the solution/membrane interface. The Donnan potential results in the partial exclusion of co-ion, providing the basis of permselectivity. Although there are well-established ways to indirectly estimate the Donnan potential, it has been widely reported that it cannot be measured directly. Here we report the first direct measurement of the Donnan potential of an ion exchange membrane equilibrated with salt solutions. Our results highlight the dependence of the Donnan potential on external salt concentration and counter-ion valence, and show a reasonable agreement with current theoretical models of IEMs, which incorporate ion activity coefficients. By directly measuring the Donnan potential, we eliminate ambiguities that arise from limitations inherent in current models.

Suggested Citation

  • Pinar Aydogan Gokturk & Rahul Sujanani & Jin Qian & Ye Wang & Lynn E. Katz & Benny D. Freeman & Ethan J. Crumlin, 2022. "The Donnan potential revealed," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33592-3
    DOI: 10.1038/s41467-022-33592-3
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    References listed on IDEAS

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