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Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores
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Artificial sodium-selective ionic device based on crown-ether crystals with subnanometer pores.

Tingyan Ye1, Gaolei Hou2, Wen Li1

  • 1Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou, China.

Nature Communications
|September 2, 2021
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Summary

Researchers developed an artificial sodium-selective ionic device using porous crown-ether crystals. This device mimics biological sodium channels, achieving high selectivity for sodium ions over other metal ions.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Biological sodium channels selectively transport sodium ions across membranes.
  • Artificial solid-state ionic devices with ion selectivity are crucial for separation technologies.
  • Achieving high ion selectivity in artificial devices remains a significant challenge.

Purpose of the Study:

  • To report the development of an artificial sodium-selective ionic device.
  • To investigate the ion selectivity of synthesized porous crown-ether crystals.
  • To compare the performance of the artificial device with biological sodium channels.

Main Methods:

  • Synthesis of porous crown-ether crystals with densely packed 0.26-nm-wide pores.
  • Fabrication of an artificial ionic device utilizing these crystals.
  • Measurement of ion selectivity ratios for Na+ against K+, Ca2+, and Mg2+.

Main Results:

  • The artificial device demonstrated a Na+ selectivity of 15 against K+.
  • Exceptional selectivity was observed against Ca2+ (523) and Mg2+ (1128).
  • Selectivity performance against Ca2+ and Mg2+ significantly surpassed biological counterparts.

Conclusions:

  • The synthesized porous crown-ether crystals form an effective artificial sodium-selective ionic device.
  • The observed selectivity is attributed to a combination of size exclusion and molecular recognition effects.
  • This study advances the understanding of structure-performance relationships in ion-selective nanopores.