Alignment Dynamics of Single-Walled Carbon Nanotubes in Pulsed Ultrahigh Magnetic Fields

We have measured the dynamic alignment properties of single-walled carbon nanotube (SWNT) suspensions in pulsed high magnetic fields through linear dichroism spectroscopy. Millisecond-duration pulsed high magnetic fields up to 56 T as well as microsecond-duration pulsed ultrahigh magnetic fields up...

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Bibliographic Details
Published in:ACS nano 2009-01, Vol.3 (1), p.131-138
Main Authors: Shaver, Jonah, Parra-Vasquez, A. Nicholas G, Hansel, Stefan, Portugall, Oliver, Mielke, Charles H, von Ortenberg, Michael, Hauge, Robert H, Pasquali, Matteo, Kono, Junichiro
Format: Article
Language:English
Subjects:
Algorithms
Anisotropy
Carbon - chemistry
Condensed Matter
Electromagnetic Fields
Light
Microscopy, Atomic Force
Models, Statistical
Nanoparticles - chemistry
Nanotechnology - methods
Nanotubes - chemistry
Nanotubes, Carbon - chemistry
Physics
Rheology
Spectrum Analysis
Superconductivity
Surface Properties
Time Factors
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Summary:We have measured the dynamic alignment properties of single-walled carbon nanotube (SWNT) suspensions in pulsed high magnetic fields through linear dichroism spectroscopy. Millisecond-duration pulsed high magnetic fields up to 56 T as well as microsecond-duration pulsed ultrahigh magnetic fields up to 166 T were used. Because of their anisotropic magnetic properties, SWNTs align in an applied magnetic field, and because of their anisotropic optical properties, aligned SWNTs show linear dichroism. The characteristics of their overall alignment depend on several factors, including the viscosity and temperature of the suspending solvent, the degree of anisotropy of nanotube magnetic susceptibilities, the nanotube length distribution, the degree of nanotube bundling, and the strength and duration of the applied magnetic field. To explain our data, we have developed a theoretical model based on the Smoluchowski equation for rigid rods that accurately reproduces the salient features of the experimental data.
ISSN:1936-0851
1936-086X
DOI:10.1021/nn800519n