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Abstract <p>Fractions of single-walled carbon nanotubes separated by diameter and conductivity type are obtained by aqueous two-phase extraction. In the case of the sodium cholate - Pluronic F127 pair of surfactants, the upper fraction is enriched with nanotubes of smaller diameters, while the lower fraction is enriched with nanotubes of larger diameters. In the case of the sodium cholate - sodium dodecylsulfate pair, the upper fraction is enriched with semiconducting nanotubes, while metallic nanotubes dominate in the lower fraction. The effect of the surfactant concentration on the purity of the fractions separated by conductivity type is studied. The concentrations of polymers and surfactants used in the one-step separation are found to provide the 97.6% purity of the metallic fraction and more than 99.9% of the semiconductor fraction.</p>

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Separation of Single-Walled Carbon Nanotubes of Large Diameters by Aqueous Two-Phase Extraction

  • 期刊论文

  • 发表日期：

    2025年3月28日

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  • N. R. Arutyunyan,
  • Z. E. Aldikanji,
  • S. V. Terekhov,
  • E. D. Obraztsova

摘要

Abstract

Fractions of single-walled carbon nanotubes separated by diameter and conductivity type are obtained by aqueous two-phase extraction. In the case of the sodium cholate - Pluronic F127 pair of surfactants, the upper fraction is enriched with nanotubes of smaller diameters, while the lower fraction is enriched with nanotubes of larger diameters. In the case of the sodium cholate - sodium dodecylsulfate pair, the upper fraction is enriched with semiconducting nanotubes, while metallic nanotubes dominate in the lower fraction. The effect of the surfactant concentration on the purity of the fractions separated by conductivity type is studied. The concentrations of polymers and surfactants used in the one-step separation are found to provide the 97.6% purity of the metallic fraction and more than 99.9% of the semiconductor fraction.