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(Color online) Dropping ethanol into water generates the motion of a plastic boat floating on water. By changing the relative position of ethanol outlet, the moving direction can be steered [(a)–(d)] in a straight line, and [(e)–(h)] in a circular track.
(Color online) (a) Moving speed of the boat with different loads, where the starting volume of ethanol in syringe is identical for each run, and the weight is equally distributed to avoid tilting. (b) Scheme of cantilever bending and force measurement. (c) Dropping five ethanol droplets ( volume of each drop) into water bends the cantilever (red); dropping water in the same manner produces no significant motion (purple), which can hardly be distinguished from the background (blue). The curves are vertically shifted for comparison. (d) Dropping the mixtures of ethanol-water at a different volume ratio drives the motion of the boat.
(Color online) (a) Moving speed of an unloaded boat driven by different solvents. (b) Bending of a cantilever induced by of each solvent: the numbers from 1 to 5 stand for methanol, ethanol, isopropanol, acetone, and acetonitrile, respectively. (c) Dropping ethanol into water. (d) Dropping water into water.
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