Figure 5
Contact sensing for different device configurations (twisting, pre-load, and strain), (a) When cyclic loading is applied (period 0.7 seconds), sensors respond consistently under repeated loading over several hundred cycles. Top: 6 turns. Bottom panel: 11 turns. (b) Resistance increased with force applied to an unstretched sensor (0% strain) at all levels of twisting, and (c) likewise increased with force applied to a stretched sensor (100% strain). (d) Images showing the deformation of the twisted microtubules with applied pressure (6 turns shown). The nominal untwisted length of the tested devices was 40 mm. Other details were as described in the main text.
