Figure 1.

Geometry elements. (Color online) Pictorial view of (a) a carbon disk composed of six wedge sections of angle π/3, then (b) the removal of a <a onClick="popup('http://www.nanoscalereslett.com/content/8/1/384/mathml/M2','MathML',630,470);return false;" target="_blank" href="http://www.nanoscalereslett.com/content/8/1/384/mathml/M2">View MathML</a> wedge sections from the disk, and (c) by folding, it is constructed as a cone. Geometrical elements: generatrix rD, height hc, base radius rc, and apex opening angle 2θ, where sinθ=1−nw/6.

Ulloa et al. Nanoscale Research Letters 2013 8:384   doi:10.1186/1556-276X-8-384
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