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

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

Published on: January 9, 2017

Static light scattering resolves colloid structure in index-matched porous media.

David C Mays¹, Orion T Cannon, Adam W Kanold

¹University of Colorado Denver, Department of Civil Engineering, Campus Box 113, PO Box 173364, Denver, CO 80217-3364, USA. david.mays@ucdenver.edu

Journal of Colloid and Interface Science

|August 16, 2011

Summary

Researchers developed a new method using static light scattering to measure colloid aggregate structure in porous media. This technique quantifies fractal dimension, offering insights into soil structuring and contaminant transport.

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Area of Science:

Colloid and Surface Science
Porous Media Physics
Materials Science

Background:

Colloidal phenomena are crucial in natural porous media, affecting soil structure, contaminant transport, filtration, and clogging.
Existing pore space geometry measurement methods are inadequate for dynamic colloidal processes.

Purpose of the Study:

To introduce a novel technique for quantifying colloid aggregate structure as a fractal dimension.
To enable the study of dynamic colloidal phenomena in porous media.

Main Methods:

Utilized static light scattering within index-matched porous media (granular Nafion).
Validated the method by comparing scattering in suspensions and porous media.
Assessed the impact of multiple scattering on fractal dimension determination.

Main Results:

Achieved consistent fractal dimension measurements in both suspensions and porous media.
Confirmed that multiple scattering does not affect fractal dimension at relevant concentrations.
Observed aggregate restructuring in porous media, indicated by an increased fractal dimension, linked to fluid shear stress.

Conclusions:

The developed static light scattering technique effectively quantifies colloid aggregate fractal dimension in porous media.
This method overcomes limitations of existing techniques for dynamic colloidal processes.
The findings facilitate fundamental descriptions of colloidal behavior in natural porous systems.