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Application of Voltage in Dynamic Light Scattering Particle Size Analysis

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Published on: January 24, 2020

High-concentration zeta potential measurements using light-scattering techniques.

Michael Kaszuba¹, Jason Corbett, Fraser Mcneil Watson

¹Malvern Instruments Ltd, Grovewood Road, Enigma Business Park, Malvern, Worcestershire WR14 1XZ, UK. michael.kaszuba@malvern.com

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences

|August 25, 2010

Summary

Measuring zeta potential in concentrated, turbid dispersions is challenging. A novel cell with reduced path length allows accurate electrophoretic mobility measurements, crucial for understanding particle interactions.

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Area of Science:

Colloid and Surface Science
Materials Science
Analytical Chemistry

Background:

Zeta potential governs electrostatic interactions in particle dispersions.
Laser Doppler electrophoresis (LDE) measures electrophoretic mobility for zeta potential.
Traditional LDE requires optically transparent samples, necessitating dilution for concentrated or turbid dispersions.

Purpose of the Study:

To investigate the measurement of zeta potential in turbid samples at high concentrations.
To address the challenges of measuring electrophoretic mobility in concentrated dispersions using light-scattering techniques.
To evaluate a novel cell design for improved measurements of turbid samples.

Main Methods:

Electrophoretic mobility measurements using Laser Doppler Electrophoresis (LDE).
Utilized a novel cell with a reduced optical path length to accommodate turbid samples.
Tested titanium dioxide and polyurethane dispersions at various concentrations.

Main Results:

Electrophoretic mobility measurements were successfully performed on turbid samples at high concentrations.
A gradual decrease in electrophoretic mobility was observed with increasing sample concentration for both titanium dioxide and polyurethane dispersions.
The study discussed potential reasons for the observed decrease in mobility and compared results with theoretical models.

Conclusions:

The novel reduced path length cell enables reliable zeta potential measurements in concentrated, turbid dispersions.
Dilution can alter zeta potential, making direct measurement of neat samples desirable.
The findings provide insights into particle interactions in concentrated systems and inform material characterization.