Difference between revisions of "Hauptseminar Soft Matter SS 2019/Microswimmers under confinement"
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{{Seminartopic | {{Seminartopic | ||
|topic=Microswimmers under confinement | |topic=Microswimmers under confinement | ||
| − | |speaker= | + | |speaker= Philipp Stärk |
|date=2019-06-21 | |date=2019-06-21 | ||
|time=14:00 | |time=14:00 | ||
|tutor=[[Christoph Lohrmann]] | |tutor=[[Christoph Lohrmann]] | ||
| − | |handout= | + | |handout=[https://www.icp.uni-stuttgart.de/~icp/html/teaching/2019-ss-hauptseminar/handout_stark.pdf] |
}} | }} | ||
Latest revision as of 08:48, 17 June 2019
- "{{{number}}}" is not a number.
- Date
- 2019-06-21
- Time
- 14:00
- Topic
- Microswimmers under confinement
- Speaker
- Philipp Stärk
- Tutor
- Christoph Lohrmann
- Handout
- [1]
Contents
When a boundary is nearby, the swimming trajectories of self-propelled active particles are greatly altered by the interactions between the swimmer and the confining surface. These interactions are not always repulsive, because the interplay of the hydrodynamic flow field generated by the swimmer and the boundary conditions imposed by the surface can yield an effective attraction. This can lead to phenomena like self-trapping and circular swimming on surfaces as well as oscillatory trajectories or a change in swimming speed.
To understand the swimmer dynamics near boundaries, first, the influence of boundaries on leading order singularities of a multipole expansion of the microswimmer-generated flow field are isolated and characterized. The results of this analytically tractable, minimalistic approach are then compared to numeric simulations of more realistic models of microswimmers.
Literature
-
Allison P Berke, Linda Turner, Howard C Berg, Eric Lauga.
Hydrodynamic attraction of swimming microorganisms by surfaces.
Physical Review Letters 101(3):038102, 2008.
[PDF] (245 KB) [DOI] -
S. E. Spagnolie, E. Lauga.
Hydrodynamics of self-propulsion near a boundary: predictions and accuracy of far-field approximations.
Journal of Fluid Mechanics 700:105–147, 2012.
[DOI] -
Eric Lauga, Willow R. DiLuzio, George M. Whitesides, Howard A. Stone.
Swimming in Circles: Motion of Bacteria near Solid Boundaries.
Biophysical Journal 90(2):400–412, 2006.
[DOI] [URL] -
Juho S Lintuvuori, Aidan T Brown, Kevin Stratford, Davide Marenduzzo.
Hydrodynamic oscillations and variable swimming speed in squirmers close to repulsive walls.
Soft Matter 12(38):7959–7968, 2016.
[DOI] -
Kenta Ishimoto, Eamonn A Gaffney.
Squirmer dynamics near a boundary.
Physical Review E 88(6):062702, 2013.
[DOI] -
W E Uspal, Mikhail N Popescu, S Dietrich, M Tasinkevych.
Self-propulsion of a catalytically active particle near a planar wall: from reflection to sliding and hovering.
Soft Matter 11(3):434–438, 2015.
[DOI]