The removal of metallic single-walled carbon nanotubes using an aqueous two-phase system

Malcolm S.Y. Tang, T. J. Whitcher, K. H. Yeoh, C. L. Chua, K. L. Woon, P. L. Show, Y. K. Lin, T. C. Ling

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Here we report our findings on the removal of metallic single-walled carbon nanotubes using an aqueous two-phase system. The aqueous two-phase system contained as received carbon nanotubes, polyethylene glycol, dextran, N-methylpyrrolidone, cetyltrimethylammonium bromide, and water which phase separated into top and bottom phases. The top phase was dominated by polyethylene glycol whereas the bottom phase was dominated by dextran. The dextran-rich phase contained more semiconducting species while metallic species was more abundant in the polyethylene glycol rich-phase. It was found via Fourier-Transform Infrared Spectroscopy that cetyltrimethylammonium bromide only present in the dextran-rich phase. A selectivity mechanism is tentatively proposed and discussed.

Original languageBritish English
Pages (from-to)3398-3402
Number of pages5
JournalJournal of Nanoscience and Nanotechnology
Volume14
Issue number5
DOIs
StatePublished - May 2014

Keywords

  • Aqueous two phase
  • Carbon nanotube
  • Purification

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