A new purification method for carbon nanotubes and associated atomic force microscope force–distance curve analysis
| Autor: | Tian Tang, Jie Chen, Chuan He, James Xing, Yuzhi Hao, Hongbo Zeng |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Materials science
Force-distance curves Filtration and Separation Mechanical properties of carbon nanotubes Nanotechnology Carbon nanotube Analytical Chemistry law.invention JKR model Gene Delivery Condensed Matter::Materials Science Gene therapy Microelectronics Single-walled carbon nanotubes (SWCN) law Magnetic characteristic Sample point Magnetic properties Peak values Nanomagnetics Purification methods Sample surface AFM tip Gene transfer Nanoscopic scale Atomic force microscopes business.industry Conventional methods Force Curve Biomedical applications Transmission electron microscopy Micro-electronic devices Magnetic nanoparticles Magnetic SWNTs Purification method Magnetic force microscope business Medical applications |
| Zdroj: | Separation and Purification Technology. 81:174-183 |
| ISSN: | 1383-5866 |
| DOI: | 10.1016/j.seppur.2011.07.025 |
| Popis: | The discovery of carbon nanotubes has opened numerous cutting-edge nanoscale research fields, such as microelectronic devices and biomedical applications. Although pure nanotubes suffice for most purposes, highly purified magnetic carbon nanotubes are more suitable for specialized applications such as gene delivery. The conventional methods of purification are too harsh for nanotubes to retain their magnetic properties, hence it requires loading of magnetic nanoparticles inside individual tubes. In this paper, we propose an innovative purification method to directly extract magnetic carbon nanotubes from arc-discharged single-walled carbon nanotubes. The procedure is easy, and atomic force microscope (AFM) force-distance curve analysis combined with transmission electron microscopy (TEM) images are used to monitor the purification process. The AFM force-distance curves present the forces between the AFM tip and different sample surfaces. By comparing the peak values on a series of curves associated with different sample points, we can directly differentiate the carbon nanotubes retaining magnetic characteristics from other nanotubes after the purification process. © 2011 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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