Journal
SMALL
Volume 3, Issue 10, Pages 1784-1791Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.200700334
Keywords
carbon nanotubes; magnetophoresis; microfluidics; purification; separation
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Funding
- Ministry of Education, Science & Technology (MoST), Republic of Korea [kaist72] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2005-01291] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A magnetophoretic continuous purification method is presented of single-walled carbon nanotubes (SWCNTs) from the superparamagnetic iron-catalyst impurities in a microfluidic device without any influence on inherent SWCNT properties. By employing microfluidics and a magnetic-field-induced saw-tooth nickel microstructure, a highly enhanced magnetic force in adjoining microchannels is exploited. The iron impurities of SWCNTs are attracted towards areas of higher magnetic-flux density in the microchannels where magnetic field was asymmetrically generated perpendicularly to the streamline. We obtained highly purified SWCNTs at a rate of 0.36 mgh(-1) and that are estimated to be about 99 % purity.
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