Migration and separation of polymers in non-uniform active baths
arxiv(2024)
摘要
Polymer-like structures are ubiquitous in nature and synthetic materials.
Their configurational and migration properties are often affected by crowded
environments leading to non-thermal fluctuations. Here, we study an ideal Rouse
chain in contact with a non-homogeneous active bath, characterized by the
presence of active self-propelled agents which exert time-correlated forces on
the chain. By means of a coarse-graining procedure, we derive an effective
evolution for the center of mass of the chain and show its tendency to migrate
towards and preferentially localize in regions of high/low bath activity
depending on the model parameters. In particular, we demonstrate that an active
bath with non-uniform activity can be used to separate efficiently polymeric
species with different lengths and/or connectivity.
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