Shaping the gradients driving phoretic micro-swimmers: influence of swimming speed, budget of carbonic acid and environment
Abstract pH gradient-driven modular micro-swimmers are investigated as a model for a large variety of quasi-two-dimensional chemi-phoretic self-propelled entities. Using three-channel micro-photometry, we obtain a precise large field mapping of pH at a spatial resolution of a few microns and a pH re...
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Springer Science and Business Media LLC
2021
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Online Access: | http://dx.doi.org/10.1140/epje/s10189-021-00026-9 https://link.springer.com/content/pdf/10.1140/epje/s10189-021-00026-9.pdf https://link.springer.com/article/10.1140/epje/s10189-021-00026-9/fulltext.html |
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crspringernat:10.1140/epje/s10189-021-00026-9 2023-05-15T15:52:31+02:00 Shaping the gradients driving phoretic micro-swimmers: influence of swimming speed, budget of carbonic acid and environment Möller, Nadir Liebchen, Benno Palberg, Thomas Johannes Gutenberg-Universität Mainz 2021 http://dx.doi.org/10.1140/epje/s10189-021-00026-9 https://link.springer.com/content/pdf/10.1140/epje/s10189-021-00026-9.pdf https://link.springer.com/article/10.1140/epje/s10189-021-00026-9/fulltext.html en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY The European Physical Journal E volume 44, issue 3 ISSN 1292-8941 1292-895X Surfaces and Interfaces General Materials Science General Chemistry Biophysics Biotechnology journal-article 2021 crspringernat https://doi.org/10.1140/epje/s10189-021-00026-9 2022-01-04T15:55:31Z Abstract pH gradient-driven modular micro-swimmers are investigated as a model for a large variety of quasi-two-dimensional chemi-phoretic self-propelled entities. Using three-channel micro-photometry, we obtain a precise large field mapping of pH at a spatial resolution of a few microns and a pH resolution of $$\sim 0.02~\hbox {pH}$$ ∼ 0.02 pH units for swimmers of different velocities propelling on two differently charged substrates. We model our results in terms of solutions of the three-dimensional advection–diffusion equation for a 1:1 electrolyte, i.e. carbonic acid, which is produced by ion exchange and consumed by equilibration with dissolved $$\hbox {CO}_{2}$$ CO 2 . We demonstrate the dependence of gradient shape and steepness on swimmer speed, diffusivity of chemicals, as well as the fuel budget. Moreover, we experimentally observe a subtle, but significant feedback of the swimmer’s immediate environment in terms of a substrate charge-mediated solvent convection. We discuss our findings in view of different recent results from other micro-fluidic or active matter investigations. We anticipate that they are relevant for quantitative modelling and targeted applications of diffusio-phoretic flows in general and artificial micro-swimmers in particular. Graphic Abstract Article in Journal/Newspaper Carbonic acid Springer Nature (via Crossref) The European Physical Journal E 44 3 |
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Springer Nature (via Crossref) |
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English |
topic |
Surfaces and Interfaces General Materials Science General Chemistry Biophysics Biotechnology |
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Surfaces and Interfaces General Materials Science General Chemistry Biophysics Biotechnology Möller, Nadir Liebchen, Benno Palberg, Thomas Shaping the gradients driving phoretic micro-swimmers: influence of swimming speed, budget of carbonic acid and environment |
topic_facet |
Surfaces and Interfaces General Materials Science General Chemistry Biophysics Biotechnology |
description |
Abstract pH gradient-driven modular micro-swimmers are investigated as a model for a large variety of quasi-two-dimensional chemi-phoretic self-propelled entities. Using three-channel micro-photometry, we obtain a precise large field mapping of pH at a spatial resolution of a few microns and a pH resolution of $$\sim 0.02~\hbox {pH}$$ ∼ 0.02 pH units for swimmers of different velocities propelling on two differently charged substrates. We model our results in terms of solutions of the three-dimensional advection–diffusion equation for a 1:1 electrolyte, i.e. carbonic acid, which is produced by ion exchange and consumed by equilibration with dissolved $$\hbox {CO}_{2}$$ CO 2 . We demonstrate the dependence of gradient shape and steepness on swimmer speed, diffusivity of chemicals, as well as the fuel budget. Moreover, we experimentally observe a subtle, but significant feedback of the swimmer’s immediate environment in terms of a substrate charge-mediated solvent convection. We discuss our findings in view of different recent results from other micro-fluidic or active matter investigations. We anticipate that they are relevant for quantitative modelling and targeted applications of diffusio-phoretic flows in general and artificial micro-swimmers in particular. Graphic Abstract |
author2 |
Johannes Gutenberg-Universität Mainz |
format |
Article in Journal/Newspaper |
author |
Möller, Nadir Liebchen, Benno Palberg, Thomas |
author_facet |
Möller, Nadir Liebchen, Benno Palberg, Thomas |
author_sort |
Möller, Nadir |
title |
Shaping the gradients driving phoretic micro-swimmers: influence of swimming speed, budget of carbonic acid and environment |
title_short |
Shaping the gradients driving phoretic micro-swimmers: influence of swimming speed, budget of carbonic acid and environment |
title_full |
Shaping the gradients driving phoretic micro-swimmers: influence of swimming speed, budget of carbonic acid and environment |
title_fullStr |
Shaping the gradients driving phoretic micro-swimmers: influence of swimming speed, budget of carbonic acid and environment |
title_full_unstemmed |
Shaping the gradients driving phoretic micro-swimmers: influence of swimming speed, budget of carbonic acid and environment |
title_sort |
shaping the gradients driving phoretic micro-swimmers: influence of swimming speed, budget of carbonic acid and environment |
publisher |
Springer Science and Business Media LLC |
publishDate |
2021 |
url |
http://dx.doi.org/10.1140/epje/s10189-021-00026-9 https://link.springer.com/content/pdf/10.1140/epje/s10189-021-00026-9.pdf https://link.springer.com/article/10.1140/epje/s10189-021-00026-9/fulltext.html |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
The European Physical Journal E volume 44, issue 3 ISSN 1292-8941 1292-895X |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1140/epje/s10189-021-00026-9 |
container_title |
The European Physical Journal E |
container_volume |
44 |
container_issue |
3 |
_version_ |
1766387677050961920 |