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Measuring Attractive Interaction between a Self-Electrophoretic Micromotor and a Wall.

Yankai Xu1, Chang Liu1, Jiayu Liu2

  • 1School of Physics and Astronomy, Institute of Natural Sciences and MOE-LSC, <a href="https://ror.org/0220qvk04">Shanghai Jiao Tong University</a>, Shanghai 200240, China.

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We measured the force needed to detach chemically driven micromotors from surfaces. Stronger chemical driving increased this force, revealing a novel attraction mechanism between like-charged objects.

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Area of Science:

  • Surface science
  • Chemical engineering
  • Physics

Background:

  • Chemically driven micromotors show strong surface affinity.
  • Quantifying micromotor-wall interactions is experimentally challenging.
  • Existing models do not fully explain these interactions.

Purpose of the Study:

  • To experimentally quantify the interaction strength between micromotors and surfaces.
  • To investigate the influence of chemical driving on motor-wall adhesion.
  • To elucidate the underlying physical mechanism of this attraction.

Main Methods:

  • Applying an external force to detach self-electrophoretic micromotors from a surface.
  • Measuring the disengaging force as a function of chemical driving strength.
  • Utilizing an electrokinetic numerical model with fully resolved double layers for validation.

Main Results:

  • The disengaging force increases with chemical driving strength.
  • This force can exceed the motor's effective gravity and propulsive thrust.
  • Experimental findings are accurately reproduced by the numerical model.

Conclusions:

  • A novel nonequilibrium mechanism drives attraction between like-charged objects.
  • Proton accumulation between the micromotor and wall generates this attractive force.
  • This work provides a quantitative understanding of micromotor-surface interactions.