BS ISO 21822:2019,Fine ceramics (advanced ceramics, advanced technical ceramics) — Measurement of iso-electric point of ceramic powder.BS ISO 21822:2019 pdf free download.
BS ISO 21822:2019 specifies the test method to determine the iso-electric point of fine ceramic powders, which is measured in the state of suspension.
2 Normative references
ISO 4316, Surface active agents -Determination of plt of aqueous solutions-Potentiometric method;
ISO 13099-1, Colloidal systems-Methods for zeta-potential determination-Part 1: Electroacoustic and electrokinetic phenomena;
ISO 13099-2, Colloidal systems-Methods for zeta-potential determinatiom-Part2: Optical methods;
ISO 13099-3, Colloidal systems-Methods for zeta potential determination-Part 3 Acoustic methods;
The zeta potential analyser may vary according to the measurement principle, such as electroacoustic and electrokinetic phenomena, the optical method or the acoustic method, and shall conform to performed using the standard sample with a predefined zeta potentiation of the analyser shall be ISO 13099-1, ISO 13099-2 and ISO 13099-3, respectively.
NOTE The standard sample provided by the zeta potential analyser supplier could be applied.
6.3 Sample preparation and dispersion
Preparation
dispersion solution of ion-exchanged distilled water shall be selected as in 6.1 and an electrolyte solution of 10-3-10-2 mol/1 prepared. The powder sample shall be dispersed in the electrolyte solution to produce a ceramic slurry of suspension.
6.3. 2 Dispersion
The ceramic slurry shall be well dispersed by using a tip sonicator or ultrasonic bath. The ultrasonic irradiation shall be carried out as follows. If the ultrasonic bath is applied, place the sample abo the spot of oscillation for no less than 3 min below 300 W power. If using an ultrasonic tip sonicator place the sonicator tip in the middle of the beaker bottom and top liquid interface of the ceramic slurry sonicate for 1 min to 5 min and stabilize for 5 min to prevent any temperature increase.
BS ISO 21822:2019 pdf download
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