ArticleScience advances2023
A simple catch: Fluctuations enable hydrodynamic trapping of microrollers by obstacles.
Article in Science advances, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed.
- Article
- Rolling vesicles: From confined rotational flows to surface-enabled motion.Proceedings of the National Academy of Sciences of the United States of America · 2025Article
- Spearheading a new era in complex colloid synthesis with TPM and other silanes.Nature reviews. Chemistry · 2024Review
- Nanomotor-enhanced transport of passive Brownian particles in porous media.Science advances · 2023Article
- The mismatch between experimental and computational fluid dynamics analyses for magnetic surface microrollers.Scientific reports · 2023Article
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Authors and funding
7 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
It is known that obstacles can hydrodynamically trap bacteria and synthetic microswimmers in orbits, where the trapping time heavily depends on the swimmer flow field and noise is needed to escape the trap. Here, we use experiments and simulations to investigate the trapping of microrollers by obstacles. Microrollers are rotating particles close to a bottom surface, which have a prescribed propulsion direction imposed by an external rotating magnetic field. The flow field that drives their motion is quite different from previously studied swimmers. We found that the trapping time can be controlled by modifying the obstacle size or the colloid-obstacle repulsive potential. We detail the mechanisms of the trapping and find two remarkable features: The microroller is confined in the wake of the obstacle, and it can only enter the trap with Brownian motion. While noise is usually needed to escape traps in dynamical systems, here, we show that it is the only means to reach the hydrodynamic attractor.
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Registered trials
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