After many years of speculation, effective microdevices that can separate particles by converting random motion into directed motion have finally arrived. A new study demonstrates ratcheted transport of microspheres across a microfabricated membrane.
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Kamholz, A. A microscale Brownian ratchet. Nature Mater 2, 507–508 (2003). https://doi.org/10.1038/nmat950
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DOI: https://doi.org/10.1038/nmat950
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