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Ultrasonic Measurements in Particle Size Analysis

Particle Size Analysis

  1. David Julian McClements

Published Online: 15 SEP 2006

DOI: 10.1002/9780470027318.a1518

Encyclopedia of Analytical Chemistry

Encyclopedia of Analytical Chemistry

How to Cite

McClements, D. J. 2006. Ultrasonic Measurements in Particle Size Analysis. Encyclopedia of Analytical Chemistry. .

Author Information

  1. University of Massachusetts, Amherst, USA

Publication History

  1. Published Online: 15 SEP 2006

Abstract

The particle size distribution and concentration of a colloidal dispersion can be determined by measuring its ultrasonic velocity and/or attenuation coefficient as a function of frequency and then using a suitable mathematical model to interpret the spectra. Ultrasonic spectroscopy can be used to analyze particle sizes between about 10 nm and 1000 µm, and is suitable for application to concentrated systems (often up to 50 wt%). This technique has considerable advantages over many alternative technologies because it can be applied to systems that are optically opaque without the need of any sample preparation.