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Colloidal transport by active filaments.

Raj Kumar Manna1, P B Sunil Kumar1, R Adhikari2

  • 1Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India.

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Summary
This summary is machine-generated.

This study demonstrates active colloidal transport using an energy-powered filament, achieving speeds beyond diffusion limits. This biomimetic mechanism offers insights for designing efficient micro-scale transport systems.

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Area of Science:

  • Colloidal science
  • Active matter physics
  • Biophysics

Background:

  • Colloidal transport typically relies on external fields to overcome diffusion limits.
  • Active filaments offer a potential internal energy source for enhanced particle motion.

Purpose of the Study:

  • To demonstrate and analyze ballistic transport of a colloidal sphere powered by an attached active filament.
  • To investigate the relationship between filament dynamics and transport efficiency.

Main Methods:

  • Modeling an active filament as a semi-flexible, self-avoiding chain of chemo-mechanically active beads.
  • Incorporating fluid flow and forces from active beads into overdamped equations of motion for the colloid-filament system.
  • Characterizing filament conformational states using writhe as an order parameter.

Main Results:

  • Achieved ballistic transport of a colloidal sphere driven by internal filament energy.
  • Demonstrated that transport speed and efficiency are dependent on the filament's dynamic conformational states.
  • Identified specific filament states that maximize transport speed and efficiency.

Conclusions:

  • Internal energy sources within active filaments can drive colloidal transport beyond diffusion limits.
  • Filament conformation plays a critical role in optimizing transport performance.
  • The described mechanism provides a biomimetic model for flagellar propulsion and has potential applications in micro-scale systems.