Method and device for determining particle size distribution and zeta potential in concentrated dispersions
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United States of America Patent
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Sep 10, 2002
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app pub date -
Oct 12, 1999
filing date -
Oct 12, 1999
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Abstract
A 'coupled phase model' is used to characterize the motion induced by a sound wave of a particle relative to its dispersion medium. A Kuvabara cell model is used to describe the hydrodynamic effects, whereas a Shilov-Zharkikh cell model is used to characterize electrokinetic effects. A different approach for interpreting the experimental data is described in which the electroacoustic sensor is treated as a transmission line with various energy losses due to the reflection and sound attenuation. The experimental output is also expressed as a loss, namely the ratio of the Colloid Vibration Current to the gradient in the acoustic pressure, and is computed by subtracting all other known losses from the total loss of the electroacoustic sensor. These other energy losses can be either calculated or measured directly using reflected pulses.
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