1 زیست شناسی:: بردار کایرالیتی
A vector in this system describing a nanotube is termed the "chirality vector"~c 1/4 n~e1 � m~e2, where Thetube axis is perpendicular to the chirality vector. Two types of chirality vector provide the nanotubes with a very special arrangement of the carbon atoms; these are the "zig-zag line"~c 1/4 �n; 0� and the armchair line~c 1/4 �n; n�. Based on the chirality vector, it is possible to calculate the diameter d of a nanotube, which is given by: Any vector in this system can serve as the chirality vector; two special forms - leading to the "armchair" and the "zig-zag" line - are indicated.
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