Issue 44, 2024

Stochastic migrations of Marangoni surfers between two lobes of a dumbbell-shaped confinement

Abstract

We report an experimental investigation on the stochastic migration dynamics of Marangoni surfers (camphor-infused paper disks) between the two lobes of a dumbbell-shaped chamber. We characterize the migration dynamics using survival analysis of a configuration, wherein a configuration represents a distinct distribution of disks between the lobes. We observe that a configuration's stability decreases with increasing pairwise interactions. Consequently, the configuration with equal partitioning of disks between the lobes—that is exactly one-half of disks in each lobe for even-numbered systems but with one extra disk in either of the lobes for odd-numbered systems—has the lowest pairwise interactions, thus is always the most stable configuration. Furthermore, all configurations exhibit a stretched exponential decay with time, which is ascribed to a disk's activity decay with time or “aging”—a phenomenon validated by modeling a camphor disk as a chiral active particle (CAP) as initially proposed by Cruz et al.

Graphical abstract: Stochastic migrations of Marangoni surfers between two lobes of a dumbbell-shaped confinement

Supplementary files

Article information

Article type
Paper
Submitted
30 Jul 2024
Accepted
19 Oct 2024
First published
22 Oct 2024

Soft Matter, 2024,20, 8775-8782

Stochastic migrations of Marangoni surfers between two lobes of a dumbbell-shaped confinement

A. Upadhyaya and V. S. Akella, Soft Matter, 2024, 20, 8775 DOI: 10.1039/D4SM00914B

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