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Ultrasonic Measurement of Sub‐Micron Particles
Author(s) -
Scott David M.,
Boxman Arthur,
Edwin Jochen C.
Publication year - 1995
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.19950120603
Subject(s) - attenuation , slurry , particle size distribution , ultrasonic sensor , materials science , scattering , particle (ecology) , particle size , ultrasonic attenuation , ultrasound , optics , analytical chemistry (journal) , chemistry , physics , composite material , acoustics , chromatography , geology , oceanography
Based on technology described in a Du Pont patent for an offline system, we have developed a prototype in‐line ultrasonic cell for measuring particle size distribution. We have used this cell to verify the Allegra‐Hawley model of ultrasonic attenuation in dilute (< 5 % vol) slurries of sub‐micron ceramic particles, and we are developing a model that can cope with the multiple scattering effects occuring at higher concentrations. In this paper we present the results of attenuation measurements for ultrasound (2–50 MHz) in slurries with concentrations ranging from 0.5 010 to 38 010 (vol). The attenuation is proportional to slurry concentration up to 5 010 (vol) and is predicted by single scattering models. Above approximately 100% concentration, the attenuation is actually lower than expected. For the dilute slurries we find excellent agreement between our measurements and the Allegra‐Hawley calculations, and the effects of the particle size distribution are evident in the ultrasonic attenuation spectrum. These ultrasonic data can be inverted to determine the particle size and concentration in aqueous slurries of sub‐micron particles.