Möller, Nadir ; Liebchen, Benno ; Palberg, Thomas (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
Artikel, Zweitveröffentlichung, Verlagsversion
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Kurzbeschreibung (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 ∼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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Möller, Nadir ; Liebchen, Benno ; Palberg, Thomas |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Shaping the gradients driving phoretic micro-swimmers: influence of swimming speed, budget of carbonic acid and environment |
| Sprache: | Englisch |
| Publikationsjahr: | 5 April 2024 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | März 2021 |
| Ort der Erstveröffentlichung: | Berlin ; Heidelberg |
| Verlag: | Springer |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | The European Physical Journal E : Soft Matter and Biological Physics |
| Jahrgang/Volume einer Zeitschrift: | 44 |
| (Heft-)Nummer: | 3 |
| Kollation: | 17 Seiten |
| DOI: | 10.26083/tuprints-00023596 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/23596 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung DeepGreen |
| Kurzbeschreibung (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 ∼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. |
| Freie Schlagworte: | Soft and Granular Matter, Complex Fluids and Microfluidics, Biological and Medical Physics, Biophysics, Surfaces and Interfaces, Thin Films, Nanotechnology, Polymer Sciences, Complex Systems |
| ID-Nummer: | Artikel-ID: 41 |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-235964 |
| Zusätzliche Informationen: | Part of 1 collection: Motile Active Matter |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 530 Physik |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Physik Kondensierter Materie (IPKM) |
| Hinterlegungsdatum: | 05 Apr 2024 11:15 |
| Letzte Änderung: | 11 Apr 2024 09:49 |
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| Suche nach Titel in: | TUfind oder in Google |
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- Shaping the gradients driving phoretic micro-swimmers: influence of swimming speed, budget of carbonic acid and environment. (deposited 05 Apr 2024 11:15) [Gegenwärtig angezeigt]
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