ζ-potential

Dispersed-phases characterisation (Structural & Morphology Characterization)

This technology allows the measurement of the zeta potential of particles which are dispersed in liquid media that is strictly related with the colloidal stability of the suspensions.

The measurement of the zeta potential of particles dispersed in concentrated water-based dispersions (0.1-50 vol% depending on the sample) is performed by an electroacoustic technique (CVI). It is based on the application of a sound wave and to the detection of the corresponding electrical current generated between two electrodes immersed in the sample. From these raw data the dynamic mobility of the particles can be obtained that in turn can be converted in zeta potential on the basis of theoretical models.

Main characterizations

  • Zeta potential dependence on pH (isoelectric point determination).
  • Zeta potential dependence on the concentration of an additive (determination of the optimal concentration).

 

Instrument available:

- Dispersion Technology DT-310

Additional information on tests available:

https://www.istec.cnr.it/en/research/technological-laboratories/colloidal-property-laboratory-of-interface/  

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