Geometric effects induce anomalous size-dependent active transport in structured environments

TL;DR

This study reveals how geometric effects in structured environments cause size-dependent variations in active transport efficiency, with longer bacteria escaping trapping more effectively, influencing biological and material design.

Contribution

It demonstrates that geometric effects induce a size-dependent transition in transport behavior of active particles, combining experiments and modeling to explain the mechanism.

Findings

Longer bacteria escape trapping more effectively.

Transport switches from trapping to dispersive at a critical size.

Geometric effects can tune active matter transport.

Abstract

Variations of transport efficiency in structured environments between distinct individuals in actively self-propelled systems is both hard to study and poorly understood. Here, we study the transport of a non-tumbling {\ecoli} strain, an active-matter archetype with intrinsic size variation but fairly uniform speed, through a periodic pillar array. We show that long-term transport switches from a trapping dominated state for shorter cells to a much more dispersive state for longer cells above a critical bacterial size set by the pillar array geometry. Using a combination of experiments and modeling, we show that this anomalous size-dependence arises from an enhancement of the escape rate from trapping for longer cells caused by nearby pillars. Our results show that geometric effects can lead to size being a sensitive tuning knob for transport in structured environments, with implications in general for active matter systems and, in particular, for the morphological adaptation of bacteria to structured habitats, spatial structuring of communities and for anti-biofouling materials design.