Fig. 5: Marangoni hydrogel rotors for kinetic energy transmission and mini-generator.
From: High-performance Marangoni hydrogel rotors with asymmetric porosity and drag reduction profile
a Autonomous gear trains (speed reducer and multiplier) as motors. b Illustration of the mini-generator. The copper wire coil is connected to an electrochemical workstation to measure the induced voltage. c Time-lapse image of hydrogel rotor driving passive rotor with two magnets. d Induced voltage generated by the mini-generator with time. e Comparison of induced peak voltage in this work and that in previously reported works. f A high voltage can be obtained by half-wave rectification and switching the connection mode of ten charged capacitors. g Voltage-time curve of the capacitors when discharging to light an LED bulb (inset image). The scale bars are 1 mm in (a), 5 mm in (c).
