A device for determining the size and charge of colloidal...

Details A device for determining the size and charge of colloidal... A device for determining the size and charge of colloidal...

G - Physics

01

N

G01N 29/02 (2006.01) G01N 15/02 (2006.01) G01N 27/447 (2006.01) G01N 29/34 (2006.01)

Patent

CA 2119781

An apparatus (20) for determining the particle charge and size distribution of particles in suspensions (23) of artibrary con- centration is provided. The apparatus includes a cell (21, 22) for application of an unsteady electric field or an unsteady mechani- cal force across the suspension of at least two different frequencies for accelerating the particles. The resulting acoustic wave gen- erated by application of the electric field applied to the electrodes (34, 36), or the electrical response and the acoustic pressure at the electrodes (34, 36) generated by application of the mechanical force is measured. Transducers (37, 38) convert the mechanical forces to electrical forces. Apparatus (20) includes acoustic delay rods (24, 26) to suppress crosstalk and a third acoustic transdu- cer (32) at one electrode (34).

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