Self-propulsion of a catalytically active particle near a planar wall: from reflection to sliding and hovering
William E. Uspal,William E. Uspal,Mihail N. Popescu,Mihail N. Popescu,Mihail N. Popescu,Siegfried Dietrich,Siegfried Dietrich,Mykola Tasinkevych,Mykola Tasinkevych +8 more
TLDR
In this paper, the authors focus on a catalytically active Janus particle and predict that near a hard planar wall such a particle exhibits several scenarios of motion: reflection from the wall, motion at a steady-state orientation and height above the wall.Abstract:
Micron-sized particles moving through solution in response to self-generated chemical gradients serve as model systems for studying active matter. Their far-reaching potential applications will require the particles to sense and respond to their local environment in a robust manner. The self-generated hydrodynamic and chemical fields, which induce particle motion, probe and are modified by that very environment, including confining boundaries. Focusing on a catalytically active Janus particle as a paradigmatic example, we predict that near a hard planar wall such a particle exhibits several scenarios of motion: reflection from the wall, motion at a steady-state orientation and height above the wall, or motionless, steady "hovering." Concerning the steady states, the height and the orientation are determined both by the proportion of catalyst coverage and the interactions of the solutes with the different "faces" of the particle. Accordingly, we propose that a desired behavior can be selected by tuning these parameters via a judicious design of the particle surface chemistry.read more
Citations
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Active Particles in Complex and Crowded Environments
Clemens Bechinger,Roberto Di Leonardo,Hartmut Löwen,Charles Reichhardt,Giorgio Volpe,Giovanni Volpe +5 more
TL;DR: In this article, the authors provide a guided tour through the development of artificial self-propelling microparticles and nanoparticles and their application to the study of nonequilibrium phenomena, as well as the open challenges that the field is currently facing.
Journal ArticleDOI
Physics of microswimmers--single particle motion and collective behavior: a review.
TL;DR: The physics of locomotion of biological and synthetic microswimmers, and the collective behavior of their assemblies, are reviewed and the hydrodynamic aspects of swimming are addressed.
Journal ArticleDOI
Topographical pathways guide chemical microswimmers
Juliane Simmchen,Jaideep Katuri,William E. Uspal,William E. Uspal,Mihail N. Popescu,Mihail N. Popescu,Mykola Tasinkevych,Mykola Tasinkevych,Samuel Sanchez,Samuel Sanchez +9 more
TL;DR: It is demonstrated that step-like submicrometre topographical features can be used as reliable docking and guiding platforms for chemically active spherical Janus colloids, indicating that the chemical activity and associated hydrodynamic interactions with the nearby topography are the main physical ingredients behind the observed behaviour.
Journal ArticleDOI
Boundaries can steer active Janus spheres.
Sambeeta Das,Astha Garg,Andrew I. Campbell,Jonathan R. Howse,Ayusman Sen,Darrell Velegol,Ramin Golestanian,Stephen J. Ebbens +7 more
TL;DR: Direct motion of a specific class of catalytic motors when moving in close proximity to solid surfaces is reported through active quenching of their Brownian rotation by constraining it in a rotational well, caused not by equilibrium, but by hydrodynamic effects.
Journal ArticleDOI
Emergent behavior in active colloids
TL;DR: Active colloids are microscopic particles which self-propel through viscous fluids by converting energy extracted from their environment into directed motion as mentioned in this paper, and they generate near-surface flow fields via self-phoresis or the self-induced Marangoni effect.
References
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Proceedings of the International School of Physics Enrico Fermi
Gabriel Aeppli,Herbert A. Mook,T.E. Mason,Stephen M Hayden,Andrew Taylor,Toby Perring,Kurt Nørgaard Clausen,Peter B. Littlewood,S.-W. Cheong,Z. Fisk +9 more
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Analysis of transport phenomena
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