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  Reversible morphology-resolved chemotactic actuation and motion of Janus emulsion droplets

Frank, B. D., Djalali, S., Baryzewska, A., Giusto, P., Seeberger, P. H., & Zeininger, L. (2022). Reversible morphology-resolved chemotactic actuation and motion of Janus emulsion droplets. Nature Communications, 13: 2562. doi:10.1038/s41467-022-30229-3.

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 Creators:
Frank, Bradley D.1, Author              
Djalali, Saveh1, Author              
Baryzewska, Agata1, Author              
Giusto, Paolo2, Author              
Seeberger, Peter H.3, Author              
Zeininger, Lukas1, Author              
Affiliations:
1Lukas Zeininger, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_3179204              
2Paolo Giusto, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_3245192              
3Peter H. Seeberger - Automated Systems, Biomolekulare Systeme, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863306              

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 Abstract: We report, for the first time, a chemotactic motion of emulsion droplets that can be controllably and reversibly altered. Our approach is based on using biphasic Janus emulsion droplets, where each phase responds differently to chemically induced interfacial tension gradients. By permanently breaking the symmetry of the droplets’ geometry and composition, externally evoked gradients in surfactant concentration or effectiveness induce anisotropic Marangoni-type fluid flows adjacent to each of the two different exposed interfaces. Regulation of the competitive fluid convections then enables a controllable alteration of the speed and the direction of the droplets’ chemotactic motion. Our findings provide insight into how compositional anisotropy can affect the chemotactic behavior of purely liquid-based microswimmers. This has implications for the design of smart and adaptive soft microrobots that can autonomously regulate their response to changes in their chemical environment by chemotactically moving towards or away from a certain target, such as a bacterium.

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Language(s): eng - English
 Dates: 2022-05-102022
 Publication Status: Published in print
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 Identifiers: DOI: 10.1038/s41467-022-30229-3
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 13 Sequence Number: 2562 Start / End Page: - Identifier: ISSN: 2041-1723