Elution behavior of shortened multiwalled carbon nanotubes in size exclusion chromatography

Title
Elution behavior of shortened multiwalled carbon nanotubes in size exclusion chromatography
Authors
이원목조영진최흥렬박혜진장태현박민이현정
Keywords
Fractionation; Light scattering detection; Multiwalled carbon nanotube; Size-exclusion chromatography; Ultrasonic shortening
Issue Date
2012-12
Publisher
Journal of separation science
Citation
VOL 35, NO 23, 3250-3256
Abstract
We present a rigorous investigation on elution behaviors of ultrasonically shortened multiwalled carbon nanotubes in size-exclusion chromatography. The size separation of five carbon nanotube samples that underwent ultrasonic shortening for varying lengths of time revealed the existence of three kinds of carbon species: large nanotubes, small nanotubes, and amorphous carbon species. Separation of the three different carbon species was confirmed by SEM analyses on the fractionated eluates and also by light scattering/UV absorbance double detection. The chromatographic peak intensity ratio between the large and small nanotubes suggested an increased amount of small carbon nanotubes upon longer mechanical treatment time. The effect of the concentration of carbon nanotube dispersion on elution behavior was examined, and the elution volume of the shortened nanotubes was found to decrease upon dilution while that of the large nanotubes showed the opposite tendency. Unusual elution behaviors of the multiwalled carbon nanotubes were also observed by altering the flow rate, and these behaviors could be explained by the longer equilibration time taken for large nanotubes to access the pores of the packing materials and a possible morphology change of small carbon nanotubes.
URI
http://pubs.kist.re.kr/handle/201004/44374
ISSN
16159306
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KIST Publication > Article
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