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Length Fractionation of Carbon Nanotubes Using Centrifugation


  • The authors gratefully acknowledge the support of the National Institute of Standards and Technology, in funding this work through an Innovation in Measurement Science award. Support from a National Research Council – National Institute of Standards and Technology postdoctoral fellowship (J. A. F.) is gratefully acknowledged. This article, a contribution of the National Institute of Standards and Technology, is not subject to US copyright. Certain equipment and instruments or materials are identified in the paper to adequately specify the experimental details. Such identification does not imply recommendation by the National Institute of Standards and Technology, nor does it imply the materials are necessarily the best available for the purpose.


Scalable separation of single-walled carbon nanotubes (SWCNTs)by length and chirality is critical to the adaptation of these materials for applications. Ultracentrifugation of SWCNTs within a density gradient produces chiral separation of the NTs, and it is shown here that ultracentrifugation can also be used to produce length fractionated SWCNTs by exploiting their transient motion in response to applied centripetal acceleration.

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