Lu, Q. and Keskar, Gayatri and Ciocan, Razvan and Rao, Rahul and Mathur, Rakesh B. and rao, Appa M. Rao and Larcom, Lyndon L. (2006) Determination of carbon nanotube density by gradient sedimentation. Journal of Physical Chemistry B , 110 (48). pp. 24371-24376. ISSN 1520-5207

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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.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s American Chemical Society.
Subjects:	Chemistry > Physical Chemistry
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	08 May 2018 11:55
Last Modified:	08 May 2018 11:55
URI:	http://npl.csircentral.net/id/eprint/2446

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