Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.208302
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Funding
- National Science Foundation [CBET-1336893]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1336893] Funding Source: National Science Foundation
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We show that dielectric colloidal dimers with broken symmetry in geometry, composition, or interfacial charges can all propel in directions that are perpendicular to the applied ac electric field. The asymmetry in particle properties ultimately results in an unbalanced electrohydrodynamic flow on two sides of the particles. Consistent with scaling laws, the propulsion direction, speed, and orientation of dimers can be conveniently tuned by frequency. The new propulsion mechanism revealed here is important for building colloidal motors and studying collective behavior of active matter.
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