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Working principle of the fluidic energy harvester based on conductive droplet (not to scale): (a) and (b) indicates different droplet position vs. the IDEs and (c) equivalent circuit.
Capacitance versus droplet position.
Prototype and test setup: (a) optical image for prototype of fluidic energy harvester on PCB; (b) cross-section view of the prototype; and (c) schematic drawing of the test system.
Typical output voltage and power vs. time in the prototype finger with w = 500 µm: (a) D = 1.0 mm and (b) D = 1.2 mm.
Typical output voltage and power vs. time for ionic liquid marble in the prototype.
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