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  Chemotaxis and autochemotaxis of self-propelling droplet swimmers

Jin, C., Krüger, C., & Maass, C. C. (2017). Chemotaxis and autochemotaxis of self-propelling droplet swimmers. Proceedings of the National Academy of Sciences of the United States of America, 114(20), 5089-5094. doi:10.1073/pnas.1619783114.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-2FA5-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-98A6-7
Genre: Journal Article

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 Creators:
Jin, Chenyu1, Author              
Krüger, Carsten2, Author              
Maass, Corinna C.1, Author              
Affiliations:
1Group Active soft matter, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063307              
2Group Granular matter and irreversibility, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063306              

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Free keywords: Artificial swimmers; Chemotaxis; Autochemotaxis; Microfluidics
 Abstract: Chemotaxis and autochemotaxis play an important role in many essential biological processes. We present a self-propelling artificial swimmer system that exhibits chemotaxis as well as negative autochemotaxis. Oil droplets in an aqueous surfactant solution are driven by interfacial Marangoni flows induced by micellar solubilization of the oil phase. We demonstrate that chemotaxis along micellar surfactant gradients can guide these swimmers through a microfluidic maze. Similarly, a depletion of empty micelles in the wake of a droplet swimmer causes negative autochemotaxis and thereby trail avoidance. We studied autochemotaxis quantitatively in a microfluidic device of bifurcating channels: Branch choices of consecutive swimmers are anticorrelated, an effect decaying over time due to trail dispersion. We modeled this process by a simple one-dimensional diffusion process and stochastic Langevin dynamics. Our results are consistent with a linear surfactant gradient force and diffusion constants appropriate for micellar diffusion and provide a measure of autochemotactic feedback strength vs. stochastic forces. This assay is readily adaptable for quantitative studies of both artificial and biological autochemotactic systems.

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Language(s): eng - English
 Dates: 2017-05-022017
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1073/pnas.1619783114
 Degree: -

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Title: Proceedings of the National Academy of Sciences of the United States of America
Source Genre: Journal
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Publ. Info: -
Pages: - Volume / Issue: 114 (20) Sequence Number: - Start / End Page: 5089 - 5094 Identifier: ISSN: 0027-8424