A chemical steering wheel for micromotors

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Molecular and colloidal \'motors\' have at-tracted much attention over the past two decades as synthetic analogues of mo-tor proteins and microorganisms such as bacteria.While schemes have been developed for powering these objects with light,ultrasound,electric and mag-netic fields,and thermal gradients,chem-ically propelled swimmers most closely resemble their biological counterparts by converting chemical energy to me-chanical energy [1].The chemical gradi-ents generated by one swimmer can be felt by its neighbors,and this gives rise to biomimetic collective behavior such as swarming and predator-prey interac-tions [2].
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