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  • Title: Wall-induced lateral migration in particle electrophoresis through a rectangular microchannel.
    Author: Liang L, Ai Y, Zhu J, Qian S, Xuan X.
    Journal: J Colloid Interface Sci; 2010 Jul 01; 347(1):142-6. PubMed ID: 20400083.
    Abstract:
    The fundamental study of particle electrophoresis in microchannels is relevant to many applications. It has long been accepted that particles move parallel to the applied electric field in a straight uniform microchannel. This paper presents the first experimental demonstration of lateral particle migration in electrophoresis through a rectangular microchannel. This wall-induced dielectrophoresis-resembled motion is driven by the electrical force arising from the non-uniform electric field around the particle. It decays rapidly when the particle is away from the channel wall, and vanishes in the center of the channel. The observed result is a focused particle stream flowing along the channel centerline. The measured widths of the particle stream at various electric fields agree reasonably with the predictions of an approximate analytical model.
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