zetacompactbZetameter ZetaCompact

Zeta Potential using the technique of micro-electrophoresis

Description - Principle

ZetaCompact is a zetameter based on the micro-electrophoresis, i.e. coupling direct observation (microscopy) and particles motion under an applied electric field (electrophoresis). Illumination of the measuring cell is done by a laser sheet or Single Plane Illumination Microscopy generated by the combination of lenses and a laser. This technique allows an observation in a single vertical plane.




To determine Zeta Potential, this plane must correspond to the stationary layer which is accurately located and controlled. Particles motion is recorded with a high sensitivity digital camera.

ZetaCompact Principle

Electrophoretic mobilities distribution is thus measured using a novel tracking algorithm optimized to follow up to 5 000 tracks/sequence. Based on digital images correlation, this algorithm offers a more accurate and sensitive determination of Zeta Potential, either in dilute or semi-diluted systems.



ZetaCompact measures in live the following parameters, relevant in the determination of Zeta Potential:


Electrophoretic mobility

- 15 to +15 µms-1 /Vcm -1

Applied electric field

0 to 250 V


0,01 to 100 mScm -1

Particles size range

0 to 30 µm


1 to 10 000 ppm


2 to 12


Numerous applications of ZetaCompact end-users concern mainly the following activities:

  • Suspensions
  • Emulsions
  • Bacteria
  • Proteins
  • Nanoparticles


Download some references and literature published by ZetaCompact end-users.

New algorithm for particle tracking zetametry

Micro-electrophoresis: High resolution particle images velocimetry

Particle tracking velocimetry (PTV) is a velocimetry method to determine the velocity of particles suspended in a liquid. With over 20 years of experience in PTV, CAD Instruments implemented a new algorithm based on digital image correlation to improve zetameters accuracy.

Main advantages:

  • High resolution
  • Compatible with digital CCD
  • Up to 5000 tracking per video sequence
  • Updating possible for existing  ZetaCompact and Zetaphoremeter



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