Light-activated Janus particles in geometrically confined binary solvent
arXiv:2607.15085
The paper studies how light‑activated Janus particles move in a binary solvent confined within a channel, showing that confinement slows the particles but prolongs directed motion and that light intensity induces strong fluctuations in speed.
Abstract
The coupled dynamics of local fields exert a drastic influence on the light-activated self-propulsion of a Janus particle in a binary solvent under spatial confinement. In this work, we investigate this problem using numerical simulations that account for local phase separation and wetting phenomena, as well as hydrodynamic effects. We find that confining the binary solvent within a channel results in a reduction of the active particle's propulsion speed and an extension of the duration of its directed motion. Furthermore, the orientational dynamics of this self-propelled particle are not restricted to two dimensions, unlike the phenomenon known as "orientational quenching". Increasing the light intensity leads to strong fluctuations in the local fields and, consequently, in the particle's speed. In this context, the significance of key physical parameters governing the efficiency of particle motion control is elucidated.
16 pages, 13 figures, and 2 tables