Research Article

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2011, 4(7): 623–634

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https://doi.org/10.1007/s12274-011-0118-9

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

Pei Zhao1, Erik Einarsson1,2, Georgia Lagoudas3, Junichiro Shiomi1, Shohei Chiashi1, and Shigeo Maruyama1 ()

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1 Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan
2 Global Center of Excellence for Mechanical Systems Innovation, The University of Tokyo, Tokyo 113-8656, Japan
3 Department of Bioengineering, Rice University, Houston, TX 77005, USA

Keywords: Single-walled carbon nanotubes, density gradient ultracentrifugation, sodium deoxycholate, sodium dodecyl sulfate
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  • Abstract
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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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Tunable Separation of Single-Walled Carbon Nanotubes by Dual-Surfactant Density Gradient Ultracentrifugation. Nano Res. 2011, 4(7): 623–634 https://doi.org/10.1007/s12274-011-0118-9

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