Non-equilibrium properties of an active nanoparticle in a harmonic potential

Alois Wurger; Falko Schmidt; Giovanni Volpe; Hana Sipova-Jungova; Mikael Käll

doi:10.1117/12.2616155

27 October 2021 Non-equilibrium properties of an active nanoparticle in a harmonic potential

Alois Wurger, Falko Schmidt, Giovanni Volpe, Hana Sipova-Jungova, Mikael Käll

Author Affiliations +

Proceedings Volume 11926, Optical Manipulation and Structured Materials Conference 2021; 119260T (2021) https://doi.org/10.1117/12.2616155
Event: SPIE Technologies and Applications of Structured Light, 2021, Online, Japan

Abstract

Thermally driven microswimmers self-propel by con- verting a self-generated heat flow to motion. In the last decade, many studies have been performed on Janus col- loids, which absorb laser light through an active cap, resulting in a temperature gradient and corresponding thermodynamic forces along the surface [1]. Particles trapped between two fluid phases, on the other hand, are advected by the Marangoni flow due to the temperature gradient along the interface [2, 3]. Steering along a given trajectory has been implemented by dynamical feedback [4] or spatial shaping of the laser beam [5]. Active motion arises from the creep flow along the particle surface. Its axisymmetric component results in linear motion of the Janus particle. In various instances, however, active particles show also rotational motion. Thus complex trajectories have been observed for Janus colloids carrying a metal cap of irregular shape or moving in a in non- uniform laser intensity profile [3–6].

Citation Download Citation

Alois Wurger, Falko Schmidt, Giovanni Volpe, Hana Sipova-Jungova, and Mikael Käll "Non-equilibrium properties of an active nanoparticle in a harmonic potential", Proc. SPIE 11926, Optical Manipulation and Structured Materials Conference 2021, 119260T (27 October 2021); https://doi.org/10.1117/12.2616155

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