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• W2913338438 endingPage "3460" @default.
• W2913338438 startingPage "3455" @default.
• W2913338438 abstract "Microscale devices must overcome fluid reversibility to propel themselves in environments where viscous forces dominate. One approach, used by colloidal microwheels (μwheels) consisting of superparamagnetic particles assembled and powered by rotating ac magnetic fields, is to employ a nearby surface to provide friction. Here, we used total internal reflection microscopy to show that individual 8.3 μm particles roll inefficiently with significant slip because of a particle–surface fluid gap of 20–80 nm. We determined that both gap width and slip increase with the increasing particle rotation rate when the load force is provided by gravity alone, thus providing an upper bound on translational velocity. By imposing an additional load force with a dc magnetic field gradient superimposed on the ac field, we were able to decrease the gap width and thereby enhance translation velocities. For example, an additional load force of 0.2 Fg provided by a dc field gradient increased the translational velocity from 40 to 80 μm/s for a 40 Hz rotation rate. The translation velocity increases with the decreasing gap width whether the gap is varied by dc field gradient-induced load forces or by reducing the Debye length with salt. These results present a strategy to accelerate surface-enabled rolling of microscale particles and open the possibility of high-speed μwheel rolling independent of the gravitational field." @default.
• W2913338438 created "2019-02-21" @default.
• W2913338438 creator A5030297463 @default.
• W2913338438 creator A5050438606 @default.
• W2913338438 creator A5070205215 @default.
• W2913338438 date "2019-02-06" @default.
• W2913338438 modified "2023-10-18" @default.
• W2913338438 title "ac/dc Magnetic Fields for Enhanced Translation of Colloidal Microwheels" @default.
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• W2913338438 doi "https://doi.org/10.1021/acs.langmuir.8b04084" @default.
• W2913338438 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6536127" @default.
• W2913338438 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30726100" @default.
• W2913338438 hasPublicationYear "2019" @default.
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