Determination of Carbon Nanotube Density by Gradient Sedimentation
- 10 November 2006
- journal article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry B
- Vol. 110 (48), 24371-24376
- https://doi.org/10.1021/jp063660k
Abstract
Density gradient centrifugation is a high-resolution technique for the separation and characterization of large molecules and stable complexes. We have analyzed various nanotube structures by preparative centrifugation in sodium metatungstate-water solutions. Bundled, isolated and acid-treated single-walled nanotubes (SWNTs) and multiwall nanotubes (MWNTs) formed sharp bands at well-defined densities. The structure of the material in each band was confirmed by transmission electron microscopy and Raman spectroscopy. Our data suggest respective densities of 1.87, 2.13, 1.74, and 2.1 g/cm(3) for bundled, isolated, and acid-treated SWNTs and MWNTs. These measured results compare well with their calculated densities.This publication has 9 references indexed in Scilit:
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