Shaping the gradients driving phoretic micro-swimmers: influence of swimming speed, budget of carbonic acid and environment
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...
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ftulbdarmstadt:oai:tuprints.ulb.tu-darmstadt.de:23596 2024-04-28T08:15:38+00:00 Shaping the gradients driving phoretic micro-swimmers: influence of swimming speed, budget of carbonic acid and environment Möller, Nadir Liebchen, Benno Palberg, Thomas 2024-04-05 text http://tuprints.ulb.tu-darmstadt.de/23596/ https://tuprints.ulb.tu-darmstadt.de/23596/1/s10189-021-00026-9.pdf https://tuprints.ulb.tu-darmstadt.de/23596/3/10189_2021_26_MOESM1_ESM.docx https://doi.org/10.26083/tuprints-00023596 en eng Springer https://tuprints.ulb.tu-darmstadt.de/23596/1/s10189-021-00026-9.pdf https://tuprints.ulb.tu-darmstadt.de/23596/3/10189_2021_26_MOESM1_ESM.docx Möller, Nadir <http://tuprints.ulb.tu-darmstadt.de/view/person/M=F6ller=3ANadir=3A=3A.html> Liebchen, Benno <http://tuprints.ulb.tu-darmstadt.de/view/person/Liebchen=3ABenno=3A=3A.html> Palberg, Thomas <http://tuprints.ulb.tu-darmstadt.de/view/person/Palberg=3AThomas=3A=3A.html> (2024)Shaping the gradients driving phoretic micro-swimmers: influence of swimming speed, budget of carbonic acid and environment. In: The European Physical Journal E : Soft Matter and Biological Physics, 2021, 44 (3) doi:10.26083/tuprints-00023596 <https://doi.org/10.26083/tuprints-00023596> Article, Secondary publication, Publisher's Version CC BY 4.0 International - Creative Commons, Attribution info:eu-repo/semantics/openAccess Article NonPeerReviewed info:eu-repo/semantics/article 2024 ftulbdarmstadt https://doi.org/10.26083/tuprints-00023596 2024-04-09T23:38:56Z 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 ∼0.02pH 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 CO₂. 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. Article in Journal/Newspaper Carbonic acid TU Darmstadt: tuprints |
institution |
Open Polar |
collection |
TU Darmstadt: tuprints |
op_collection_id |
ftulbdarmstadt |
language |
English |
description |
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 ∼0.02pH 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 CO₂. 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. |
format |
Article in Journal/Newspaper |
author |
Möller, Nadir Liebchen, Benno Palberg, Thomas |
spellingShingle |
Möller, Nadir Liebchen, Benno Palberg, Thomas Shaping the gradients driving phoretic micro-swimmers: influence of swimming speed, budget of carbonic acid and environment |
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 |
publishDate |
2024 |
url |
http://tuprints.ulb.tu-darmstadt.de/23596/ https://tuprints.ulb.tu-darmstadt.de/23596/1/s10189-021-00026-9.pdf https://tuprints.ulb.tu-darmstadt.de/23596/3/10189_2021_26_MOESM1_ESM.docx https://doi.org/10.26083/tuprints-00023596 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_relation |
https://tuprints.ulb.tu-darmstadt.de/23596/1/s10189-021-00026-9.pdf https://tuprints.ulb.tu-darmstadt.de/23596/3/10189_2021_26_MOESM1_ESM.docx Möller, Nadir <http://tuprints.ulb.tu-darmstadt.de/view/person/M=F6ller=3ANadir=3A=3A.html> Liebchen, Benno <http://tuprints.ulb.tu-darmstadt.de/view/person/Liebchen=3ABenno=3A=3A.html> Palberg, Thomas <http://tuprints.ulb.tu-darmstadt.de/view/person/Palberg=3AThomas=3A=3A.html> (2024)Shaping the gradients driving phoretic micro-swimmers: influence of swimming speed, budget of carbonic acid and environment. In: The European Physical Journal E : Soft Matter and Biological Physics, 2021, 44 (3) doi:10.26083/tuprints-00023596 <https://doi.org/10.26083/tuprints-00023596> Article, Secondary publication, Publisher's Version |
op_rights |
CC BY 4.0 International - Creative Commons, Attribution info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.26083/tuprints-00023596 |
_version_ |
1797581096646344704 |