Figure 3
Spatio-temporal speed dependence of vapor-powered micromotors.
(A) Dependence of the motor speed upon time and fuel concentration at a fixed separation distance of 0.5 cm. (a–c) Track lines of the micromotor motion, over a 2 sec period, taken from SI Video 3, 5 min after placing droplets of 10%, 20% and 30% hydrazine, respectively, 0.5 cm apart. (B) Dependence of the motor speed upon the time and separation distance using a source droplet containing 20% hydrazine. (a–c) Track lines of the micromotor motion, over 2 second periods, taken from SI Video 4, 5 min after placing the fuel droplet containing 20% hydrazine at separation distances of 1, 2 and 3 cm, respectively. (d) Corresponding 3D plots. Scale bar, 10 μm. Droplet diameter and volume: 2.5 mm and 1 μL, respectively.
