Figure S3
A simplified set-up to test the relative importance of capacitive and resistive driving force in the propulsion and stabilization of the robot. The bottom electrode is covered with an insulating film (65 μm Kapton tape) and the motion of the robot is observed from different starting positions. With the electrodes insulated and voltage in the range 1.3 kV – 3.5 kV, we did not observe any significant propulsion nor attraction. The robot slowly floated in the container driven by thermal fluctuations.