Larger diameter selection of carbon nanotubes by two phase extraction using amphiphilic polymeric surfactant

Seokhyeon Son, Hyunjun Park, Woo Dong Jang, Sang Yong Ju

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1 Citation (Scopus)


Aqueous two-phase extraction is instrumental for obtaining single-walled carbon nanotubes (SWNT) with uniform physical properties. This study reports that a nonionic amphiphilic poly(2-ethyloxazoline)-benzyl ether derivative (POBE-BzE) not only efficiently disperses SWNT in both water and p-xylene, but can also be utilized as a single-surfactant for partitioning SWNT in a water/p-xylene two-phase extraction in a diameter (dt) selective manner. While individual POBE-BzE/SWNT dispersions exhibit similar photoluminescence positions from the SWNT, dt-dependency occurs according to the solvent. Upon two-phase extraction, a dt SWNT >0.9 nm was mainly extracted to the p-xylene layer, and its partition coefficient was investigated by varying the phase transfer catalyst or sodium chloride amounts, where sodium chloride served as a better transfer agent. The dt selective behavior and its partition coefficient were rationalized by the tight and loose configurations of the BzE moiety in each medium. This novel amphiphilic polymeric surfactant and two-phase extraction may be useful for sorting SWNT and other nanomaterials according to their size.

Original languageEnglish
Article number120425
JournalJournal of Molecular Liquids
Publication statusPublished - 2022 Dec 1

Bibliographical note

Publisher Copyright:
© 2022 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Materials Chemistry


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