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. 2015 Jun 19;6:7470. doi: 10.1038/ncomms8470

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(a) Sketch of the setup. Five5-micrometre PMMA colloids roll in a microchannel made of two ITO-coated glass slides assembled with double-sided scotch tape. An electrokinetic flow confines the rollers at the centre of the device in a circular chamber of radius R_c. (b) Superimposed fluorescence pictures of a dilute ensemble of rollers (E₀/E_Q=1.1, φ₀=6 × 10⁻³). The colloids propel only inside a circular disc of radius R_c=1 mm and follow persistent random walks.