F. Alba et al., Acoustic spectroscopy as a technique for the particle sizing of high concentration colloids, emulsions and suspensions, COLL SURF A, 153(1-3), 1999, pp. 495-502
Citations number
5
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
The particle size distribution of particles in liquid-based suspensions and
emulsions is an important parameter in a wide variety of industrial applic
ations. Many particle-sizing methods require the transmission of light thro
ugh a sample of the system, and therefore these particulate systems must be
severely diluted. Many systems are unstable on dilution and therefore have
to be measured at high volume concentration. Sound waves interact with bot
h the suspending medium and the dispersed phase and are able to propagate t
hrough concentrated systems. The development of new ultrasonic transducer t
echnology together with advances in digital signal processing has opened th
e way for a powerful new analysis termed acoustic attenuation spectroscopy.
The technique consists of propagating ultrasonic waves of a range of frequ
encies through the particulate system and accurately measuring the attenuat
ion at each frequency. This attenuation spectrum can be converted to a part
icle size distribution and a measure of the concentration of the dispersed
phase. It offers the particle technologist the means to monitor and control
particle formation and reduction processes. (C) 1999 Elsevier Science B.V.
All rights reserved.