Elution behavior of shortened multiwalled carbon nanotubes in size exclusion chromatography

Authors
Lee, WonmokCho, Young JinChoi, Heung RyulPark, Hye JinChang, TaihyunPark, MinLee, Hyunjung
Issue Date
2012-12
Publisher
WILEY-V C H VERLAG GMBH
Citation
JOURNAL OF SEPARATION SCIENCE, v.35, no.23, pp.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.
Keywords
FIELD-FLOW FRACTIONATION; CAPILLARY-ELECTROPHORESIS; ELECTRONIC-STRUCTURE; MOLECULAR-WEIGHT; SEPARATION; LENGTH; PURIFICATION; NANOCOMPOSITES; EFFICIENCY; EMISSION; FIELD-FLOW FRACTIONATION; CAPILLARY-ELECTROPHORESIS; ELECTRONIC-STRUCTURE; MOLECULAR-WEIGHT; SEPARATION; LENGTH; PURIFICATION; NANOCOMPOSITES; EFFICIENCY; EMISSION; Fractionation; Light scattering detection; Multiwalled carbon nano-tube; Size-exclusion chromatography; Ultrasonic shortening
ISSN
1615-9306
URI
https://pubs.kist.re.kr/handle/201004/128594
DOI
10.1002/jssc.201200489
Appears in Collections:
KIST Article > 2012
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