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Related Experiment Video

Updated: Jun 16, 2026

Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces

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Published on: July 26, 2016

The intensity correlation function in evanescent wave scattering.

B Cichocki¹, E Wajnryb, J Bławzdziewicz

¹Institute of Theoretical Physics, University of Warsaw, Hoza 69, 00-681 Warsaw, Poland. cichocki@fuw.edu.pl

The Journal of Chemical Physics

|February 23, 2010

Summary

This summary is machine-generated.

This study presents a new theory for interpreting dynamic light scattering near walls, crucial for understanding colloidal suspension behavior. The findings offer insights into near-wall colloidal dynamics, essential for advanced materials and nanotechnology applications.

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Measurement of Particle Size Distribution in Turbid Solutions by Dynamic Light Scattering Microscopy

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Area of Science:

Colloid and Interface Science
Soft Matter Physics
Dynamic Light Scattering

Background:

Interpreting dynamic light scattering (DLS) near walls is challenging.
Understanding near-wall dynamics of interacting spheres is vital for applications.

Purpose of the Study:

Develop a theory for the initial slope of the intensity autocorrelation function in DLS with evanescent illumination.
Probe near-wall dynamics of interacting spheres in colloidal suspensions.

Main Methods:

Derived an expression for the first cumulant valid for arbitrary concentrations.
Generalized bulk diffusion coefficient to include wall effects.
Used a leading-order virial expansion for explicit expressions and numerical results.
Included far-field and lubrication contributions for hydrodynamic interactions.
Performed simulations to verify the theory.

Main Results:

Obtained explicit expressions for the initial slope, considering wave vector components and evanescent-light penetration depth.
Demonstrated the importance of lubrication contributions for small penetration depths.
Estimated the validity range of the virial expansion.

Conclusions:

The developed theory provides a framework for interpreting DLS experiments near walls.
The findings are crucial for understanding near-interface dynamics in colloidal systems.
The computational algorithm will aid future experiments and theoretical development.