Supplementary Figure 4: Preparation of an HHF.
From: Preparation of biomimetic hierarchically helical fiber actuators from carbon nanotubes
(a) Clamping one end of the 20-ply fibre onto a rotating motor shaft. The other end is attached to a moveable paper, and the length of the fibre is 25 cm. The fibre lays on the top of the paper. (b) Cutting the left part of the paper. (c) Anticlockwise twisting of the CNT fibre with the moveable end being moved towards the shaft while keeping the fibre horizontal. (d) The completion of a coiled fibre. Scale bar in a-d, 2 cm.
