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W1985103578 abstract "To achieve permanent propulsion of micro-objects in confined fluids is an elusive but challenging goal that will foster future development of microfluidics and biotechnology. Recent attempts based on a wide variety of strategies are still far from being able to design simple, versatile, and fully controllable swimming engines on the microscale. Here we show that DNA-linked anisotropic colloidal rotors, composed of paramagnetic colloidal particles with different or similar size, achieve controlled propulsion when subjected to a magnetic field precessing around an axis parallel to the plane of motion. During cycling motion, stronger viscous friction at the bounding plate, as compared to fluid resistance in the bulk, creates an asymmetry in dissipation that rectifies rotation into a net translation of the suspended objects. The potentiality of the method, applicable to any externally rotated micro/nano-object, is finally demonstrated in a microfluidic platform by guiding the colloidal rotors through microscopic-size channels connected in a simple geometry." @default.
W1985103578 created "2016-06-24" @default.
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W1985103578 date "2008-11-24" @default.
W1985103578 modified "2023-10-16" @default.
W1985103578 title "Magnetically Actuated Colloidal Microswimmers" @default.
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W1985103578 doi "https://doi.org/10.1021/jp808354n" @default.
W1985103578 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19367983" @default.
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