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Schematic views of (a) two pristine SWCNTs (pCNT–pCNT), (b) pCNT–cwCNT and (c) cwCNT–cwCNT, where the SWCNT (labeled CNT in the figure) and the polymer used are the (8,8) armchair and 60% DD chitosan, respectively. The distances (d(Cgi–Cgj)) and (d(Si–Sj)) and the torsion angle (τ) between the two SWCNTs were defined through the center of gravity (Cg) and the surface of each tube in which τ = 0° means the two tubes are parallel.
