Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 142, Issue 5, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4906823
Keywords
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Funding
- National Natural Science Foundation of China [11404379]
- National Science Foundation of China [11474327]
- government of China
- MOST [2015CB856800]
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An asymmetric gear with homogeneous surface properties is, here, presented as a prototype to fabricate catalytic microrotors. The driving torque arises from the diffusiophoretic effect induced by the concentration gradients generated by catalytic chemical reactions at the gear surface. This torque produces a spontaneous and unidirectional rotation of the asymmetric gear. By means of mesoscopic simulations, we prove and characterize this scenario. The gear rotational velocity is determined by the gear-solvent interactions, the gear geometry, the solvent viscosity, and the catalytic reaction ratio. Our work presents a simple way to design self-propelled microrotors, alternative to existing catalytic bi-component, or thermophoretic ones. (C) 2015 AIP Publishing LLC.
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