We investigate coarse-grained models of suspended self-thermophoretic
microswimmers. Upon heating, the Janus spheres, with hemispheres made of different
materials, induce a heterogeneous local solvent temperature that causes the self-phoretic
particle propulsion. Starting from molecular dynamics simulations that schematically
resolve the molecular composition of the solvent and the microswimmer, we verify the
coarse-grained description of the fluid in terms of a local molecular temperature field, and
its role for the particle’s thermophoretic self-propulsion and hot Brownian motion. The
latter is governed by effective nonequilibrium temperatures, which are measured from
simulations by confining the particle position and orientation. They are theoretically shown
to remain relevant for any further spatial coarse-graining towards a hydrodynamic
description of the entire suspension as a homogeneous complex fluid.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:84413 |
| Date | 30 March 2023 |
| Creators | Auschra, Sven, Chakraborty, Dipanjan, Falasco, Gianmaria, Pfaller, Richard, Kroy, Klaus |
| Publisher | Frontiers Research Foundation |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 2296-424X, 655838 |
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