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Merck

Length-dependent extraction of single-walled carbon nanotubes.

Nano letters (2005-12-15)
Kirk J Ziegler, Daniel J Schmidt, Urs Rauwald, Kunal N Shah, Erica L Flor, Robert H Hauge, Richard E Smalley
ABSTRACT

A two-phase liquid-liquid extraction process is presented which is capable of extracting water-soluble single-walled carbon nanotubes into an organic phase. The extraction utilizes electrostatic interactions between a common phase transfer agent and the sidewall functional groups on the nanotubes. Large length-dependent van der Waals forces for nanotubes allow the ability to control the length of nanotubes extracted into the organic phase as demonstrated by atomic force microscopy.

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Sigma-Aldrich
Ammonium bromide, ACS reagent, ≥99.0%
Sigma-Aldrich
Ammonium bromide, 99.999% trace metals basis
Sigma-Aldrich
Ammonium bromide, ≥99.99% trace metals basis