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Synthesis and Characterization of Supramolecular Colloids
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Cyclic force driven colloidal self-assembly near a solid surface.

Md Mahmudur Rahman1, Stuart J Williams1

  • 1Department of Mechanical Engineering, University of Louisville, KY, 40292 Louisville, USA.

Journal of Colloid and Interface Science
|September 29, 2021
PubMed
Summary
This summary is machine-generated.

Hydrodynamic interactions influence colloidal particle self-assembly near surfaces. Particle rotation and gravity dictate whether colloids form clusters or lanes, with lateral migration observed.

Keywords:
Active colloidsColloidal clusterColloidal interactions near a solid surfaceColloidal laneLateral migrationSelf-assemblyStokesian dynamicsSwarm

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Area of Science:

  • Colloid and Surface Science
  • Soft Matter Physics
  • Fluid Dynamics

Background:

  • Colloidal self-assembly is driven by various forces, including often-overlooked hydrodynamic interactions.
  • Understanding these forces is crucial for predicting and controlling particle behavior in non-equilibrium systems.

Purpose of the Study:

  • To investigate the influence of hydrodynamic interactions on the collective behavior and self-assembly of colloidal particles near a solid surface.
  • To explore how external forces, specifically rotation and gravity, affect colloidal dynamics and structure formation.

Main Methods:

  • Studied 4.0 µm PMMA colloidal particles in a rotating cylindrical cell (3.0 mm diameter, 0.25 mm height) at 20 rpm.
  • Validated experimental observations using Stokesian dynamics simulations, employing a hard-sphere-like mobility model and avoiding complex lubrication force calculations.

Main Results:

  • Colloidal particles formed circular orbits and exhibited hydrodynamic interactions.
  • Particle agglomeration into clusters or lanes was dependent on the rotation scheme and gravity forces.
  • Observed lateral migration of colloids away from the solid surface during structure evolution.

Conclusions:

  • Hydrodynamic interactions significantly influence colloidal self-assembly and structure formation.
  • The applied rotation and resulting gravity patterns are key factors in determining whether particles form clusters or lanes.
  • Colloidal dynamics near surfaces are complex, involving both attractive/repulsive forces and fluid-mediated interactions.