Length Characterization of Multi-Walled CNT by Capillary Hydrodynamic Fractionation (CHDF)
| Autor: | Ji Young Chang, Hye Jin Park, Han-Na Noh, Hyunjung Lee, Kihong Park, Min Park |
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| Rok vydání: | 2008 |
| Předmět: |
Materials science
Chromatography Capillary action Sonication Composite number Biomedical Engineering Bioengineering General Chemistry Fractionation Carbon nanotube Condensed Matter Physics law.invention Characterization (materials science) Colloid Volume (thermodynamics) Chemical engineering law General Materials Science |
| Zdroj: | Journal of Nanoscience and Nanotechnology. 8:5220-5223 |
| ISSN: | 1533-4880 |
| Popis: | Multi-walled carbon nanotubes (MWCNT) should be treated via cutting process for engineering applications because almost as-prepared MWCNT are highly entangled and aggregated. Especially, the size distribution of MWCNT after cutting process is very important factor to determine the final properties of polymer-MWCNT composite. In this study, we take a novel method for CNT characterization, a capillary hydrodynamic fractionation (CHDF), which is a traditional chromatographic method for colloid particles. The length distributions of pre-treated MWCNT by two different methods were investigated by CHDF. One is a high-power ultrasonication directly and the other is an acid treatment followed by a high-power ultrasonication. For MWCNT, retention volume apparently depends on a combination of the length, diameter and rigidity of CNTs. We found that a high-power ultrasonication renders MWCNT short into segments of a few micrometers and the additional treatment by acid solution made those much shorter and more flexible. |
| Databáze: | OpenAIRE |
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