This title appears in the Scientific Report :
2015
Please use the identifier:
http://hdl.handle.net/2128/9652 in citations.
Please use the identifier: http://dx.doi.org/10.1039/C5SM01364J in citations.
Effect of Fluid-Colloid Interactions on the Mobility of a Thermophoretic Microswimmer in Non-Ideal Fluids
Effect of Fluid-Colloid Interactions on the Mobility of a Thermophoretic Microswimmer in Non-Ideal Fluids
Janus colloids propelled by light, e.g., thermophoretic particles, offer promising prospects as artificial microswimmers. However, their swimming behavior and its dependence on fluid properties and fluid–colloid interactions remain poorly understood. Here, we investigate the behavior of a thermophor...
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Personal Name(s): | Fedosov, Dmitry (Corresponding author) |
---|---|
Sengupta, Ankush / Gompper, Gerhard | |
Contributing Institute: |
Theorie der Weichen Materie und Biophysik; IAS-2 Theorie der Weichen Materie und Biophysik; ICS-2 |
Published in: | Soft matter, 11 (2015) 33, S. 6703-6715 |
Imprint: |
London
Royal Soc. of Chemistry
2015
|
PubMed ID: |
26223678 |
DOI: |
10.1039/C5SM01364J |
Document Type: |
Journal Article |
Research Program: |
Functional Macromolecules and Complexes |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1039/C5SM01364J in citations.
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520 | |a Janus colloids propelled by light, e.g., thermophoretic particles, offer promising prospects as artificial microswimmers. However, their swimming behavior and its dependence on fluid properties and fluid–colloid interactions remain poorly understood. Here, we investigate the behavior of a thermophoretic Janus colloid in its own temperature gradient using numerical simulations. The dissipative particle dynamics method with energy conservation is used to investigate the behavior in non-ideal and ideal-gas like fluids for different fluid–colloid interactions, boundary conditions, and temperature-controlling strategies. The fluid–colloid interactions appear to have a strong effect on the colloid behavior, since they directly affect heat exchange between the colloid surface and the fluid. The simulation results show that a reduction of the heat exchange at the fluid–colloid interface leads to an enhancement of colloid's thermophoretic mobility. The colloid behavior is found to be different in non-ideal and ideal fluids, suggesting that fluid compressibility plays a significant role. The flow field around the colloid surface is found to be dominated by a source-dipole, in agreement with the recent theoretical and simulation predictions. Finally, different temperature-control strategies do not appear to have a strong effect on the colloid's swimming velocity. | ||
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