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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Biological membrane proteins inspire artificial ion channels for selective ion transport.
  • Increasing demand for lithium necessitates efficient separation technologies.
  • Existing artificial channels face challenges in achieving high monovalent cation selectivity.

Purpose of the Study:

  • To engineer a novel ion transport channel utilizing confined ice within two-dimensional (2D) capillaries.
  • To investigate the influence of confined ice anisotropy on monovalent cation permselectivity.
  • To explore the potential for efficient lithium separation using this engineered channel.

Main Methods:

  • Development of an ion transport channel based on 2D confined ice within vermiculite capillaries.
  • Analysis of monovalent cation permselectivity, focusing on lithium, sodium, and potassium ions.
  • Investigation of the relationship between confined ice anisotropy and ion transport properties.

Main Results:

  • Anomalous lithium-selective transport was observed along the (002) direction of 2D confined ice.
  • Exceptional Li+/Na+ (556 ± 86) and Li+/K+ (901 ± 172) permselectivity were achieved, surpassing most existing ion-selective channels.
  • Lithium permselectivity was found to be direction-dependent and tunable by adjusting interlayer spacing.

Conclusions:

  • The anisotropy of 2D confined ice plays a crucial role in achieving high monovalent cation permselectivity.
  • This engineered channel demonstrates significant potential for efficient lithium separation.
  • The findings provide insights for designing advanced monovalent ion-selective channels.