Issue 6, 2024

Active chiral dynamics and boundary accumulation phenomenon in confined camphor particles

Abstract

In this work, we perform experimental and numerical investigations on the dynamics of camphor-infused discs, well-established as active particles in their behavior. Our analysis focuses on examining the individual dynamics of these discs within a confined circular domain, revealing that they exhibit characteristics akin to active chiral particles. To characterize this behavior effectively, we introduce a methodology for estimating key model parameter values from our experiments, including linear velocity, angular velocity, and angular noise intensity. To validate our findings, we compare our experimental results with numerical simulations of the model. Our results demonstrate a striking phenomenon associated with camphor-infused discs: a pronounced accumulation of particles along the boundary. This intriguing observation suggests the occurrence of an attractive interaction between the active particles and the boundary, resulting in a kind of adsorption effect. The latter results in the confinement of the camphor disc along the Petri dish wall, which we refer to as sliding dynamics. We empirically determine the velocity of the particle along the Petri dish wall as well as its fluctuations, properties whose behavior notably deviates from the bulk dynamics.

Graphical abstract: Active chiral dynamics and boundary accumulation phenomenon in confined camphor particles

Supplementary files

Article information

Article type
Paper
Submitted
19 Oct 2023
Accepted
21 Dec 2023
First published
27 Dec 2023

Soft Matter, 2024,20, 1199-1209

Active chiral dynamics and boundary accumulation phenomenon in confined camphor particles

J. Cruz, O. Díaz-Hernández, A. Castañeda-Jonapá, G. Morales-Padrón, A. Estudillo and R. Salgado-García, Soft Matter, 2024, 20, 1199 DOI: 10.1039/D3SM01407J

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