Supplementary Information
Vibration driven vehicle inspired from grass spike
Suo Bai1, Qi Xu1, Yong Qin1,2,* 1. Institute of Nanoscience and Nanotechnology, Lanzhou University, Lanzhou 730000, China 2. Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100085, China * Correspondence and Requests for materials should be addressed to: Yong Qin,
[email protected]
Figure S1. A spike moving on a rolled cloth. (a) Images of a Setaria viridis spike’s motion on a vibrating cloth which is rolled up into a semi-tubular shape. The inset is a top view of the spike along with the cloth. The arrow points from the tail to the head of the spike. (b) The speed of the spike moving on a cotton wire and a cloth, respectively. The error bars represent standard deviations.
Figure S2. A VDV climbing up in a glass tube with a pencil in front of it. The inner diameter of the glass tube is 1.4 cm and the weight of the pencil is 0.63 g.
Figure S3. Procedure for fabricating a VDV. (a) Schematic of the process about fabrication of a patterned PDMS film with tilt pillar arrays. (b) Roll the film to form a VDV. (c) Optical image of the fabricated VDV.
Supplemental Movie: Movie S1: A live video of spike contest. Movie S2: The spike’s moving direction reversed when its initial placing direction was reversed. Movie S3: A loaded spike moving along a tilt track. Movie S4: Motion of skins on a vibrating tilt drum with tilt angle 21°. Movie S5: Motion of a spike on a rolled cloth. Movie S6: A spike climbing up a plastic tube. Movie S7: Motion of a VDV on a horizontal groove. Movie S8: A VDV moving along a circular plastic tube. Movie S9: A VDV climbing up in a glass tube. Movie S10: A micro-scaled VDV climbing up in a capillary whose inner diameter is 300 m. This video was captured by a transillumination method.
