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Colloidal transport in bacteria suspensions: from bacteria scattering to anomalous and enhanced diffusion
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Colloidal transport in bacteria suspensions: from bacteria scattering to anomalous and enhanced diffusion
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Paper
Colloidal transport in bacteria suspensions: from bacteria scattering to anomalous and enhanced diffusion
2020
Overview
Colloids coupled to a bath of swimming cells generically display enhanced diffusion. This transport dynamics stems from a subtle interplay between the active and passive particles that still resists our understanding despite decades of intense research. Here, we tackle the root of the problem by providing a quantitative characterisation of the single scattering events between a colloid and a bacterium. Based on our experiments, we build a minimal model that quantitatively predicts the geometry of the scattering trajectories, and enhanced colloidal diffusion at long times. This quantitative confrontation between theory and experiments elucidates the microscopic origin of enhanced transport. Collisions are solely ruled by stochastic contact interactions responsible both for genuine anomalous diffusion at short times and enhanced diffusion at long times with no ballistic regime at any scale.
Publisher
Cornell University Library, arXiv.org
Subject
