TY - JOUR
T1 - Alignment dynamics of single-walled carbon nanotubes in pulsed ultrahigh magnetic fields
AU - Shaver, Jonah
AU - Parra-Vasquez, A. Nicholas G.
AU - Hansel, Stefan
AU - Portugall, Oliver
AU - Mielke, Charles H.
AU - Von Ortenberg, Michael
AU - Hauge, Robert H.
AU - Pasquali, Matteo
AU - Kono, Junichiro
PY - 2009/1
Y1 - 2009/1
N2 - 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.
AB - 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.
KW - Absorption spectra of molecules
KW - Carbon nanotubes
KW - Dichroism of molecules
KW - Light absorption and transmission, generation of high magnetic fields
KW - Optical properties of carbon nanotubes
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U2 - 10.1021/nn800519n
DO - 10.1021/nn800519n
M3 - Article
C2 - 19206259
AN - SCOPUS:61849183670
SN - 1936-0851
VL - 3
SP - 131
EP - 138
JO - ACS nano
JF - ACS nano
IS - 1
ER -