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Linking Catalyst-Coated Isotropic Colloids into "Active" Flexible Chains Enhances Their Diffusivity.

Bipul Biswas1, Raj Kumar Manna2, Abhrajit Laskar3

  • 1Complex Fluids and Polymer Engineering, Polymer Science and Engineering, CSIR-National Chemical Laboratory , Dr. Homi Bhabha Road, Pune 411008, India.

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Summary
This summary is machine-generated.

Active colloids, even simple ones, can move faster. Linking isotropic colloids into flexible chains significantly enhances their diffusion, showing activity can control mobility.

Keywords:
Brownian motionactive mattercolloidal assemblydiffusivityice templating

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Area of Science:

  • Soft Matter Physics
  • Colloidal Science
  • Active Matter

Background:

  • Active colloids exhibit non-equilibrium behavior, such as enhanced diffusion and collective motion (flocks, swarms).
  • Previous studies focused on Janus particles or high concentrations for activity-induced phenomena.
  • The role of hydrodynamic interactions and chain flexibility in active colloidal systems remains less explored.

Purpose of the Study:

  • To demonstrate significant diffusivity enhancement in uniformly catalyzed, isotropic colloids without Janus architecture or high concentrations.
  • To investigate the effect of chain formation and flexibility on colloidal mobility.
  • To elucidate the mechanisms behind diffusivity enhancement using simulations.

Main Methods:

  • Synthesized uniformly platinum-nanoparticle-coated, isotropic colloidal beads.
  • Linked colloids into chains to enforce proximity and study collective behavior.
  • Measured diffusivity enhancements using experimental techniques and validated with simulations incorporating hydrodynamic interactions.

Main Results:

  • Achieved up to 60% diffusivity enhancement for individual colloidal chains in dilute solutions.
  • Demonstrated a positive correlation between chain flexibility and diffusivity.
  • Simulations accurately reproduced experimental results, attributing enhancement to chain dynamics and active phoretic flows.

Conclusions:

  • Activity can be engineered in simple, isotropic colloids through controlled hydrodynamic interactions.
  • Colloidal chain flexibility is a key factor in modulating mobility in active systems.
  • This work provides a pathway to systematically control the transport properties of soft slender bodies.