Figure 2. Chirality separation of SWCNTs using single-surfactant multicolumn gel chromatography (SS-MUGEC).

(a) Schematic diagram of SS-MUGEC for separating SWCNTs. (b) Optical absorption spectra and (c) photograph of the separated metallic and semiconducting SWCNT fractions (2,000 ml per fraction, ~0.8 μg ml⁻¹). In b, the relative interaction strength between SWCNTs and the gel is indicated with an arrow (Col., column; Semi, semiconducting).