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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Online Access: | https://dx.doi.org/10.26083/tuprints-00023596 https://tuprints.ulb.tu-darmstadt.de/id/eprint/23596 |
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ftdatacite:10.26083/tuprints-00023596 2024-06-09T07:45:20+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 https://dx.doi.org/10.26083/tuprints-00023596 https://tuprints.ulb.tu-darmstadt.de/id/eprint/23596 unknown Springer Creative Commons Attribution 4.0 International Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 Text ScholarlyArticle article-journal Article 2024 ftdatacite https://doi.org/10.26083/tuprints-00023596 2024-05-13T10:49:26Z 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 ... Article in Journal/Newspaper Carbonic acid DataCite Metadata Store (German National Library of Science and Technology) |
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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 ... |
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 |
https://dx.doi.org/10.26083/tuprints-00023596 https://tuprints.ulb.tu-darmstadt.de/id/eprint/23596 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_rights |
Creative Commons Attribution 4.0 International Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_doi |
https://doi.org/10.26083/tuprints-00023596 |
_version_ |
1801374633949134848 |