Autonomously moving catalytic microellipsoids dynamically guided by external magnetic fields.

Advances toward the realization of smarter transport systemsrequire the design of artificial microengines with versatilemagneticproperties,capableofdistinguishingthedirectionsofmotion, and to make complete 1808 turns without losingcontrol.Here we report on a new technique for realizingparamagnetic catalytic microellipsoids, displaying all pre-viously mentioned properties. Our approach is based on theuseofjanusparamagneticellipsoidalparticleshalf-coatedwitha thin Pt layer and immersed in a H

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