Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 14, Issue 5, Pages 3398-3402Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2014.8680
Keywords
Carbon Nanotube; Aqueous Two Phase; Purification
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Funding
- University of Malaya Research Grant (UMRG) [RG006/09AFR]
- HIR-MOHE [F000006-21001]
- eScience Fund [02-01-03-SF0649]
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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.
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