Image: Cobalt hydroxide nanotubes

Description: Co(OH)2 nanotubes: (a,b, SWNT; c, double-layer nanotube). Spiral structures and tubes can coexist by altering the reaction conditions (d,e). One end of the tube shows a clear transit from a helical structure to a tubular structure by enlarging the area in the red square of (d). Scale bars: (a) 500 nm, inset, 200  nm; (b) 500  nm; (c,e) 50 nm; (d) 100  nm.
Title: Cobalt hydroxide nanotubes
Credit: http://www.nature.com/ncomms/2015/151029/ncomms9756/full/ncomms9756.html
Author: Bing Ni et al.
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