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Issue 47, 2018
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Electrokinetic droplet transport from electroosmosis to electrophoresis

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Abstract

Droplet transport in microfluidic channels by electrically induced flows often entails the simultaneous presence of electroosmosis and electrophoresis. Here we make use of coupled lattice-Boltzmann/molecular dynamics simulations to compute the mobility of a droplet in a microchannel under the effect of an external electric field. By varying the droplet solvation free energy of the counterions released at the channel walls, we observe the continuous transition between the electroosmotic and electrophoretic regime. We show that it is possible to describe the mobility of a droplet in a unified, consistent way, by combining the theoretical description of the electroosmotic flow with, in this case, the Hückel limit of electrophoresis, modified in order to take into account the Hadamard–Rybczynski droplet drag.

Graphical abstract: Electrokinetic droplet transport from electroosmosis to electrophoresis

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Publication details

The article was received on 31 Aug 2018, accepted on 08 Nov 2018 and first published on 16 Nov 2018


Article type: Paper
DOI: 10.1039/C8SM01788C
Citation: Soft Matter, 2018,14, 9571-9576
  • Open access: Creative Commons BY license
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    Electrokinetic droplet transport from electroosmosis to electrophoresis

    A. Bazarenko and M. Sega, Soft Matter, 2018, 14, 9571
    DOI: 10.1039/C8SM01788C

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