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  Photogravitactic microswimmers

Singh, D. P., Uspal, W. E., Popescu, M. N., Wilson, L. G., & Fischer, P. (2018). Photogravitactic microswimmers. Advanced Functional Materials, 28(25): 1706660, pp. 1-10. doi:10.1002/adfm.201706660.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000B-23F8-6 Version Permalink: https://hdl.handle.net/21.11116/0000-000B-23F9-5
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 Creators:
Singh, Dhruv P., Author
Uspal, William E., Author
Popescu, Mihail N., Author
Wilson, Laurence G., Author
Fischer, Peer1, Author           
Affiliations:
1Optical Nanoscopy, Max Planck Institute for Medical Research, Max Planck Society, ou_2364730              

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Free keywords: artificial microswimmers, Janus particles, light-driven micromotors, phototaxis, self-propulsion
 Abstract: Phototactic microorganisms are commonly observed to respond to natural sunlight by swimming upward against gravity. This study demonstrates that synthetic photochemically active microswimmers can also swim against gravity. The particles initially sediment and, when illuminated at low light intensities exhibit wall-bound states of motion near the bottom surface. Upon increasing the intensity of light, the artificial swimmers lift off from the wall and swim against gravity and away from the light source. This motion in the bulk has been further confirmed using holographic microscopy. A theoretical model is presented within the framework of self-diffusiophoresis, which allows to unequivocally identify the photochemical activity and the phototactic response as key mechanisms in the observed phenomenology. Since the lift-off threshold intensity depends on the particle size, it can be exploited to selectively address particles with the same density from a polydisperse mixture of active particles and move them in or out of the boundary region. This study provides a simple design strategy to fabricate artificial microswimmers whose two- or three-dimensional swimming behavior can be controlled with light.

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Language(s): eng - English
 Dates: 2018-01-092017-11-152018-02-282018-06-20
 Publication Status: Issued
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/adfm.201706660
BibTex Citekey: 2018singh
 Degree: -

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Title: Advanced Functional Materials
  Abbreviation : Adv. Funct. Mater.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH Verlag GmbH
Pages: - Volume / Issue: 28 (25) Sequence Number: 1706660 Start / End Page: 1 - 10 Identifier: ISSN: 1616-301X
CoNE: https://pure.mpg.de/cone/journals/resource/954925596563