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Dynamic clustering of active chemotactic Janus particles
Abstract
Modeling self-propulsion as an emergent diffusiophoretic effect, we come back to the dynamic clustering experiment of active Janus colloids. Working in the original three-dimensional geometry, and using the chemical solute concentration as a control parameter, we find that the dynamic clustering region occupies a robust fraction of the phase diagram. This behavior is rationalized using a linear stability analysis that efficiently captures the instability of the gas phase to dynamic clusters. We also find that dynamic clustering results from the combined effects of a Keller-Segel collapse and of a motility-induced phase separation, either being arrested by the orientational coupling to the chemical field in agreement with previous work.
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BibTeX
@misc{mabillard2026dynamic,
title = {{Dynamic clustering of active chemotactic Janus particles}},
author = {Joël Mabillard and Frédéric van Wijland and Jean-Baptiste Fournier},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.26657},
eprint = {2610.26657},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.26657},
}
RIS
TY - UNPB
TI - Dynamic clustering of active chemotactic Janus particles
AU - Joël Mabillard
AU - Frédéric van Wijland
AU - Jean-Baptiste Fournier
PY - 2026
DA - 2026/10/19
PB - arXiv
DO - 10.48550/arxiv.2610.26657
UR - https://arxiv.org/abs/2610.26657
AB - Modeling self-propulsion as an emergent diffusiophoretic effect, we come back to the dynamic clustering experiment of active Janus colloids. Working in the original three-dimensional geometry, and using the chemical solute concentration as a control parameter, we find that the dynamic clustering region occupies a robust fraction of the phase diagram. This behavior is rationalized using a linear stability analysis that efficiently captures the instability of the gas phase to dynamic clusters. We also find that dynamic clustering results from the combined effects of a Keller-Segel collapse and of a motility-induced phase separation, either being arrested by the orientational coupling to the chemical field in agreement with previous work.
ER -