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Communication Dans Un Congrès Année : 2015

Enhanced active motion of Janus Colloids at the water surface

Xiaolu Wang
  • Fonction : Auteur
  • PersonId : 967058
Maurizio Nobili
  • Fonction : Auteur
  • PersonId : 879255
Christophe Blanc
Martin In

Résumé

Active colloids are an emerging and promising class of colloidal particles, which are designed to perform autonomous motion by transforming chemical or other form of energies into work and propulsion. Here, we have investigated the active motion of self-propelled colloids confined at the air-water interface. The two dimensional motion of micron-sized Silica-Platinum Janus colloids has been experimentally measured by particle tracking video-microscopy under increasing concentration of the catalytic fuel, i.e. H2O2. Comparing to the motion in 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, 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-01163595 , version 1 (15-06-2015)

Identifiants

  • HAL Id : hal-01163595 , version 1

Citer

Antonio Stocco, Xiaolu Wang, Maurizio Nobili, Christophe Blanc, Martin In. Enhanced active motion of Janus Colloids at the water surface. MICROSWIMMERS - FROM BULK TO INTERFACES, Apr 2015, Bordeaux, France. ⟨hal-01163595⟩
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