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Diffusion-Based Height Analysis Reveals Robust Microswimmer-Wall Separation.

Stefania Ketzetzi¹, Joost de Graaf², Daniela J Kraft¹

¹Soft Matter Physics, Huygens-Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, Netherlands.

Physical Review Letters

|December 18, 2020

Summary

This summary is machine-generated.

Researchers measured microswimmer distance from walls, discovering "ypsotaxis," a fixed-height behavior. This activity-induced phenomenon impacts understanding microswimmer propulsion mechanisms.

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Area of Science:

Physics
Physical Chemistry
Soft Matter Physics

Background:

Microswimmers are artificial microorganisms that propel themselves in fluids.
Their motion is often influenced by nearby surfaces like walls.
Precisely measuring the distance between microswimmers and walls is experimentally challenging.

Purpose of the Study:

To experimentally determine the separation distance between model catalytic microswimmers and a nearby wall.
To investigate the phenomenon of microswimmer-wall interaction and its dependence on various parameters.
To understand the underlying mechanisms driving microswimmer behavior near surfaces.

Main Methods:

Utilized the height dependence of the passive component of the mean-squared displacement to infer swimmer-wall separation.
Experimentally varied salt concentrations, swimmer surface charges, and swimmer sizes.
Observed and analyzed the motion of model catalytic microswimmers near a wall.

Main Results:

Successfully determined the elusive swimmer-wall separation for model catalytic microswimmers.
Discovered and termed the behavior "ypsotaxis," characterized by a fixed height maintained above the wall.
Observed ypsotaxis across a range of tested salt concentrations, surface charges, and swimmer sizes.

Conclusions:

Ypsotaxis is an activity-induced behavior in microswimmers, not solely a passive hydrodynamic or electrostatic interaction.
The fixed-height swimming (ypsotaxis) imposes constraints on current models of microswimmer propulsion.
Further research is needed to fully elucidate the propulsion mechanisms of microswimmers, considering the influence of ypsotaxis.