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Separation of single-walled carbon nanotubes using aqueous two-phase system


Tang, Malcolm S. Y. and Show, Pau Loke and Yu, Kiat Lin and Woon, Kai Lin and Tan, Chin Ping and Ling, Tau Chuan (2014) Separation of single-walled carbon nanotubes using aqueous two-phase system. Separation and Purification Technology, 125. pp. 136-141. ISSN 1383-5866; ESSN: 1873-3794


The separation of metallic single-walled carbon nanotubes (M-SWCNTs) from semiconducting single-walled carbon nanotubes (S-SWCNTs) in as-received SWCNTs is an important step to integrate carbon nanotubes into electronic applications. In this study, the effect of molecular weight (Mw) of polyethylene glycol (PEG) on the separation of M-SWCNTs from as-received SWCNTs using aqueous two-phase system (ATPS) consist of PEG, dextran, organic solvent N-methylpyrrolidone (NMP) and water has been investigated. PEG with Mw 6000 and 10,000 showed higher partition coefficient (K) and yield (Y). The semiconducting single-walled carbon nanotube (S-SWCNT) was attracted to the bottom phase. Varying the concentration of PEG 6000 and dextran could enrich the purity of M-SWCNT in the top phase to 0.2574 compared to the pristine value of 0.1506. The volume ratio (VR) that gave the highest enrichment of M-SWCNT is found to be 1.5. However, there was no significant changes in purification factor (PF) and purity when the concentration of NMP and water were manipulated. This finding provides a solid foundation for the studies of ATPS to separate different species of SWCNTs.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Food Science and Technology
DOI Number: https://doi.org/10.1016/j.seppur.2014.01.044
Publisher: Elsevier
Keywords: Aqueous two-phase system; Polyethylene glycol; Dextran; Carbon nanotubes; Purification
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 18 Feb 2016 06:40
Last Modified: 18 Feb 2016 06:40
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.seppur.2014.01.044
URI: http://psasir.upm.edu.my/id/eprint/35351
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