Dynamic Coupling at Low Reynolds Number.

Area of Science:

• Statistical physics
• Out-of-equilibrium systems
• Colloidal science

Background:

• Active colloids and microscopic swimmers are key to understanding energy transfer in non-equilibrium systems.
• Studies explore molecular energy transfer by active enzymes and catalysts.
• Low Reynolds number conditions are crucial for these investigations.

Purpose of the Study:

• To review research on energy transfer in systems with active swimmers.
• To highlight common features in the dynamic coupling of swimmers with their environment.
• To provide insights into statistical physics of out-of-equilibrium systems.

Main Methods:

• Monitoring the diffusion of non-reacting tracers in active solutions.
• Analyzing energy transfer mechanisms in colloidal suspensions.
• Comparing systems with different swimmer sizes, energy transduction modes, and propulsion strategies.

Main Results:

• Energy transfer by molecules to surroundings significantly influences system dynamics.
• The nature of energy transfer is remarkably similar across diverse swimmers.
• Common features are observed in the dynamic coupling of swimmers and their surroundings.

Conclusions:

• Active swimmers, regardless of scale or mechanism, exhibit similar energy transfer characteristics.
• Understanding these universal features offers broad insights into active matter physics.
• This research unifies observations in diverse active colloidal systems.