1. Andrew Evan Kamholz is at MesoSystems Technology Inc., 1001A Menaul Boulevard NE, Albuquerque, New Mexico 87107, USA. e-mail: andrew@kamholz.net

Abstract

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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