Dresden 2020 – scientific programme

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BP: Fachverband Biologische Physik

BP 15: Active Matter III (joint session DY/BP/CPP)

BP 15.6: Talk

Tuesday, March 17, 2020, 15:15–15:30, ZEU 160

Anomalous fluctuations accompany dynamical arrest in a cluster of chemically active colloids — •Suropriya Saha, Prathyusha K R, and Ramin Golestanian — Max Planck Institute for Dynamics and Self Organisation

Recent years have seen enormous scientific activity exploring the ability of catalytic colloids to collectively form patterns and clusters. However, fluctuations of individual colloids within a cluster remains unstudied, and is the focus of our work. Using the simplest example of active colloids, hard spheres that generate an isotropic chemical field, we find that an interplay of non-local interactions and finite system size results in the formation of a core and a surface layer in the cluster, both of which exhibit dynamics distinct from one another. The simplicity of our model suggests that aspects of the fluctuations revealed here are generic to matter driven phoretically, including enzymes.