Blow, M. L. ; Aqil, M. ; Liebchen, B. ; Marenduzzo, D. (2017)
Motility of active nematic films driven by "active anchoring".
In: Soft Matter, 13 (36)
doi: 10.1039/c7sm00325k
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We provide a minimal model for an active nematic film in contact with both a solid substrate and a passive isotropic fluid, and explore its dynamics in one and two dimensions using a combination of hybrid Lattice Boltzmann simulations and analytical calculations.We provide a minimal model for an active nematic film in contact with both a solid substrate and a passive isotropic fluid, and explore its dynamics in one and two dimensions using a combination of hybrid Lattice Boltzmann simulations and analytical calculations. By imposing nematic anchoring at the substrate while active flows induce a preferred alignment at the interface ("active anchoring"), we demonstrate that directed fluid flow spontaneously emerges in cases where the two anchoring types are opposing. In one dimension, our model reduces to an analogue of a loaded elastic column. Here, the transition from a stationary to a motile state is akin to the buckling bifurcation, but offers the possibility to reverse the flow direction for a given set of parameters and boundary conditions solely by changing initial conditions. The two-dimensional variant of our model allows for additional tangential instabilities, and it is found that undulations form in the interface above a threshold activity. Our results might be relevant for the design of active microfluidic geometries or curvature-guided self-assembly.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2017 |
| Autor(en): | Blow, M. L. ; Aqil, M. ; Liebchen, B. ; Marenduzzo, D. |
| Art des Eintrags: | Bibliographie |
| Titel: | Motility of active nematic films driven by "active anchoring" |
| Sprache: | Englisch |
| Publikationsjahr: | 31 Juli 2017 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Soft Matter |
| Jahrgang/Volume einer Zeitschrift: | 13 |
| (Heft-)Nummer: | 36 |
| DOI: | 10.1039/c7sm00325k |
| Kurzbeschreibung (Abstract): | We provide a minimal model for an active nematic film in contact with both a solid substrate and a passive isotropic fluid, and explore its dynamics in one and two dimensions using a combination of hybrid Lattice Boltzmann simulations and analytical calculations.We provide a minimal model for an active nematic film in contact with both a solid substrate and a passive isotropic fluid, and explore its dynamics in one and two dimensions using a combination of hybrid Lattice Boltzmann simulations and analytical calculations. By imposing nematic anchoring at the substrate while active flows induce a preferred alignment at the interface ("active anchoring"), we demonstrate that directed fluid flow spontaneously emerges in cases where the two anchoring types are opposing. In one dimension, our model reduces to an analogue of a loaded elastic column. Here, the transition from a stationary to a motile state is akin to the buckling bifurcation, but offers the possibility to reverse the flow direction for a given set of parameters and boundary conditions solely by changing initial conditions. The two-dimensional variant of our model allows for additional tangential instabilities, and it is found that undulations form in the interface above a threshold activity. Our results might be relevant for the design of active microfluidic geometries or curvature-guided self-assembly. |
| Freie Schlagworte: | publiziert |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Festkörperphysik (2021 umbenannt in Institut für Physik Kondensierter Materie (IPKM)) |
| Hinterlegungsdatum: | 27 Mai 2019 13:27 |
| Letzte Änderung: | 19 Aug 2020 10:45 |
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