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This study models artificial microswimmer diffusion, revealing that active diffusion is suppressed by swimmer eccentricity and angular fluctuations. The findings show a transition in diffusion dependence on self-propulsion speed, impacting experimental data interpretation.

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Statistical Mechanics

Background:

  • Artificial microswimmers exhibit complex diffusive dynamics in viscous media.
  • Understanding these dynamics is crucial for applications in micro-robotics and targeted drug delivery.
  • Eccentricity and angular fluctuations are key factors influencing microswimmer motion.

Purpose of the Study:

  • To model and analyze the two-dimensional diffusive dynamics of an eccentric artificial microswimmer.
  • To investigate the impact of propulsion offset and angular velocity fluctuations on active diffusion.
  • To explore the transition in diffusion behavior with varying self-propulsion speeds.

Main Methods:

  • Analytical modeling of microswimmer dynamics.
  • Numerical simulations to validate theoretical predictions.
  • Analysis of the active diffusion constant's dependence on model parameters.

Main Results:

  • Active diffusion is significantly suppressed by swimmer eccentricity and angular fluctuations.
  • A transition from quadratic to linear dependence of the diffusion constant on self-propulsion speed was observed.
  • The degree of suppression is highly sensitive to specific model parameters.

Conclusions:

  • The model provides a framework for understanding suppressed active diffusion in eccentric microswimmers.
  • Results have practical implications for interpreting experimental data from microswimmer studies.
  • The model is extended to include chiral eccentric swimmers, broadening its applicability.