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Article Dans Une Revue Soft Matter Année : 2015

Enhanced active motion of Janus colloids at the water surface

Xiaolu Wang
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Martin In
Christophe Blanc
Maurizio Nobili
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Antonio Stocco

Résumé

We have investigated the active motion of self-propelled colloids confined at the air–water interface and explored the possibility of enhancing the directional motion of self-propelled Janus colloids by slowing down their rotational diffusion. The two dimensional motion of micron-sized silica–platinum Janus colloids has been experimentally measured by particle tracking video-microscopy at increasing concentrations of the catalytic fuel, i.e. H2O2. Compared to the motion in the bulk, a dramatic enhancement of both the persistence length of trajectories and the speed has been observed. The interplay of colloid self-propulsion, due to an asymmetric catalytic reaction occurring on the colloid, surface properties and interfacial frictions controls the enhancement of the directional movement. The slowing down of the rotational diffusion at the interface, also measured experimentally, plays a pivotal role in the control and enhancement of active motion.
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Dates et versions

hal-01216307 , version 1 (11-03-2019)

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Xiaolu Wang, Martin In, Christophe Blanc, Maurizio Nobili, Antonio Stocco. Enhanced active motion of Janus colloids at the water surface. Soft Matter, 2015, 11 (37), pp.7376-7384. ⟨10.1039/c5sm01111f⟩. ⟨hal-01216307⟩
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