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Research Article

Tunable Separation of Single-Walled Carbon Nanotubes by Dual-Surfactant Density Gradient Ultracentrifugation

Pei Zhao1Erik Einarsson1,2Georgia Lagoudas3Junichiro Shiomi1Shohei Chiashi1Shigeo Maruyama1( )
Department of Mechanical EngineeringThe University of TokyoTokyo113-8656Japan
Global Center of Excellence for Mechanical Systems InnovationThe University of TokyoTokyo113-8656Japan
Department of BioengineeringRice UniversityHoustonTX77005USA
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Abstract

We present a systematic study of the effects of surfactants in the separation of single-walled carbon nanotubes (SWNTs) by density gradient ultracentrifugation (DGU). Through analysis of the buoyant densities, layer positions, and optical absorbance spectra of SWNT separations using the bile salt sodium deoxycholate (DOC) and the anionic salt sodium dodecyl sulfate (SDS), we clarify the roles and interactions of these two surfactants in yielding different DGU outcomes. The separation mechanism described here can also help in designing new DGU experiments by qualitatively predicting outcomes of different starting recipes, improving the efficacy of DGU and simplifying post-DGU fractionation.

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Nano Research
Pages 623-634
Cite this article:
Zhao P, Einarsson E, Lagoudas G, et al. Tunable Separation of Single-Walled Carbon Nanotubes by Dual-Surfactant Density Gradient Ultracentrifugation. Nano Research, 2011, 4(7): 623-634. https://doi.org/10.1007/s12274-011-0118-9

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Received: 11 January 2011
Revised: 24 February 2011
Accepted: 01 March 2011
Published: 24 March 2011
© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2011
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