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Capillarity ion concentration polarization as spontaneous desalting mechanism

Author

Listed:
  • Sungmin Park

    (Seoul National University)

  • Yeonsu Jung

    (Seoul National University)

  • Seok Young Son

    (Seoul National University)

  • Inhee Cho

    (Seoul National University)

  • Youngrok Cho

    (Seoul National University)

  • Hyomin Lee

    (Seoul National University
    Institute of Advanced Machines and Design, Seoul National University)

  • Ho-Young Kim

    (Seoul National University
    Institute of Advanced Machines and Design, Seoul National University
    Big Data Institute, Seoul National University)

  • Sung Jae Kim

    (Seoul National University
    Big Data Institute, Seoul National University
    Inter-university Semiconductor Research Center, Seoul National University)

Abstract

To overcome a world-wide water shortage problem, numerous desalination methods have been developed with state-of-the-art power efficiency. Here we propose a spontaneous desalting mechanism referred to as the capillarity ion concentration polarization. An ion-depletion zone is spontaneously formed near a nanoporous material by the permselective ion transportation driven by the capillarity of the material, in contrast to electrokinetic ion concentration polarization which achieves the same ion-depletion zone by an external d.c. bias. This capillarity ion concentration polarization device is shown to be capable of desalting an ambient electrolyte more than 90% without any external electrical power sources. Theoretical analysis for both static and transient conditions are conducted to characterize this phenomenon. These results indicate that the capillarity ion concentration polarization system can offer unique and economical approaches for a power-free water purification system.

Suggested Citation

  • Sungmin Park & Yeonsu Jung & Seok Young Son & Inhee Cho & Youngrok Cho & Hyomin Lee & Ho-Young Kim & Sung Jae Kim, 2016. "Capillarity ion concentration polarization as spontaneous desalting mechanism," Nature Communications, Nature, vol. 7(1), pages 1-9, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11223
    DOI: 10.1038/ncomms11223
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