NoThe motion of an artificial micro-scale swimmer that uses a chemical reaction catalyzed on its\ud own surface to achieve autonomous propulsion is fully characterized experimentally. It is shown\ud that at short times, it has a substantial component of directed motion, with a velocity that depends\ud on the concentration of fuel molecules. At longer times, the motion reverts to a random walk with\ud a substantially enhanced diffusion coefficient. Our results suggest strategies for designing artificial\ud chemotactic systems
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