Evolution and Reversible Polarity of Multilayering at the Ionic Liquid/Water Interface

HANDLE オープンアクセス
  • 天野, 健一
    Department of Energy and Hydrocarbon Chemistry, Kyoto University
  • 作花, 哲夫
    Department of Energy and Hydrocarbon Chemistry, Kyoto University・Faculty of Agriculture, Meijo University
  • 西, 直哉
    Department of Energy and Hydrocarbon Chemistry, Kyoto University
  • Bu, Wei
    ChemMatCARS, Center for Advanced Radiation Sources, University of Chicago
  • Lin, Binhua
    ChemMatCARS, Center for Advanced Radiation Sources, University of Chicago
  • Schlossman, Mark L.
    Department of Physics, University of Illinois at Chicago
  • Nishi, Naoya
    Department of Energy and Hydrocarbon Chemistry, Kyoto University

抄録

Highly correlated positioning of ions underlies Coulomb interactions between ions and electrified interfaces within dense ionic fluids such as biological cells and ionic liquids. Recent work has shown that highly correlated ionic systems behave differently than dilute electrolyte solutions, and interest is focused upon characterizing the electrical and structural properties of the dense electrical double layers (EDLs) formed at internal interfaces. It has been a challenge for experiments to characterize the progressive development of the EDL on the nanoscale as the interfacial electric potential is varied over a range of positive and negative values. Here we address this challenge by measuring X-ray reflectivity from the interface between an ionic liquid (IL) and a dilute aqueous electrolyte solution over a range of interfacial potentials from −450 to 350 mV. The growth of alternately charged cation-rich and anion-rich layers was observed along with a polarity reversal of the layers as the potential changed sign. These data show that the structural development of an ionic multilayer-like EDL with increasing potential is similar to that suggested by phenomenological theories and MD simulations, although our data also reveal that the excess charge beyond the first ionic layer decays more rapidly than predicted.

収録刊行物

詳細情報

  • CRID
    1050848650357054464
  • NII論文ID
    120006890698
  • ISSN
    15206106
    15205207
  • HANDLE
    2433/255281
  • 本文言語コード
    ja
  • 資料種別
    journal article
  • データソース種別
    • IRDB
    • CiNii Articles

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