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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

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Published on: May 20, 2014

Anisotropic diffusion in confined colloidal dispersions: the evanescent diffusivity.

James W Swan¹, John F Brady

¹Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA. jswan@caltech.edu

The Journal of Chemical Physics

|July 13, 2011

Summary

Colloidal particle diffusion near a solid boundary is described using evanescent wave dynamic light scattering. Near the wall, particle movement is significantly impacted by lubrication interactions, especially at smaller penetration depths.

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Area of Science:

Colloid and Surface Science
Soft Matter Physics
Hydrodynamics

Background:

Understanding colloidal particle dynamics near solid boundaries is crucial for various applications.
Traditional dynamic light scattering (DLS) methods have limitations in probing near-boundary phenomena.
Evanescent wave dynamic light scattering (EW-DLS) offers a unique approach to study confined colloidal systems.

Purpose of the Study:

To develop a theoretical framework for inhomogeneous and anisotropic diffusion of colloidal particles near a solid boundary.
To investigate the influence of volume fraction and evanescent penetration depth on colloidal diffusivities.
To elucidate the role of hydrodynamic interactions and lubrication forces in near-wall colloidal dynamics.

Main Methods:

Employed an analogy to traditional dynamic light scattering for analyzing EW-DLS data.
Derived new expressions for short-time self- and collective diffusivities.
Utilized accelerated Stokesian dynamics simulations to compute diffusivities across various parameters.

Main Results:

At high volume fractions and larger penetration depths, parallel diffusion is minimally affected by the boundary.
Near and normal to the wall, diffusivity strongly depends on penetration depth due to lubrication interactions.
The study provides a comprehensive determination of hydrodynamic effects on colloidal diffusion adjacent to a rigid boundary.

Conclusions:

The developed model accurately describes near-wall colloidal diffusion, accounting for boundary effects.
Lubrication forces are identified as the dominant factor influencing diffusivity normal to the wall.
Results offer significant insights into the behavior of colloidal suspensions in confined geometries.