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Voltammetric sizing of inert particles
Trevor J Davies1, Eleanor R Lowe, Shelley J Wilkins
1Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, UK.
Summary
This study introduces a simple electrochemical method to measure average inert particle size. The technique uses cyclic voltammetry on alumina particles, achieving accurate measurements by ensuring diffusion layer thickness exceeds particle size.
Area of Science:
- Electrochemistry
- Materials Science
- Nanotechnology
Background:
- Accurate particle size determination is crucial for material properties.
- Electrochemical methods offer potential for in-situ particle analysis.
- Previous methods may lack simplicity or directness for average particle sizing.
Purpose of the Study:
- To develop a straightforward electrochemical procedure for determining the average size of inert particles.
- To validate the method using alumina particles deposited on a graphite electrode.
- To establish a reliable technique for particle size analysis in materials science.
Main Methods:
- Cyclic voltammetry was performed on alumina particles immobilized on an edge-plane graphite electrode.
- A range of scan rates (0.2–2 V s⁻¹) were employed to optimize measurement conditions.
- Experimental data were compared with simulated voltammograms for accurate size determination.
Main Results:
- The electrochemical procedure successfully determined the average size of alumina particles.
- Operating at scan rates where diffusion layer thickness exceeded particle size minimized height influence.
- Simulations provided a reliable basis for extracting average particle size from voltammetric data.
Conclusions:
- A simple and effective electrochemical method for average inert particle size determination has been established.
- The technique is suitable for analyzing particles like alumina without complex instrumentation.
- This method offers a valuable tool for materials characterization and quality control.