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Surfactant Titration of Kaolin Slurries using ζ-Potential Probe

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Abstract

The electroacoustic sensor probe contains a piezoelectric transducer with a critical frequency of 3-MHz and a sensing electrode which is placed on the surface of the transducer. This electrode is separated from the external reference electrode with a non-conducting rigid ceramic insert. Internal electric impedance between these electrodes can be selected depending on the conductivity range of the samples by means of an internal transformer. The transformer is selected such that the input impedance is significantly less than the external impedance of the sample such that the resultant signal is proportional to the short circuit current. This transformer is located just behind the central electrode in order to minimize the stray capacitance.

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