The convective transport rate of polymers through confined geometries depends on their size, allowing for size-based separation of polymer mixtures (chromatography). Here, we investigate whether mixtures of active polymers can be separated in a similar manner based on their activity. We use thin, living
Tubifex tubifex
worms as a model system for active polymers and study the transport of these worms by an imposed flow through a channel filled with a hexagonal pillar array. The transport rate through the channel depends strongly on the degree of activity, an effect that we assign to the different distribution of conformations sampled by the worms depending on their activity. Our results demonstrate a unique way to sort mixtures of active polymers based on their activity and provide a versatile and convenient experimental system to investigate the hydrodynamics of active polymers.
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for commercial advantage and provided the original work is properly cited.
We thank B. Pirok and P. Schoenmakers for fruitful discussions, the UvA’s workshop for technical assistance, and aquarium shop Rainer for the fresh batches of
T. tubifex
.
Funding:
The authors acknowledge that they received no funding in support of this research.
Author contributions:
T.H., A.D., and S.W. designed the research, and T.H. built the experimental setup with the help of the workshop of the University of Amsterdam; T.H. and A.D. performed the research; T.H. analyzed the data; and all the authors contributed to the final version of the manuscript.
Competing interests:
The authors declare that they have no competing interests.
Data and materials availability:
All data needed to evaluate the conclusions in the paper are present in the paper and/or the Supplementary Materials.
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