Measurement of the mobility according to the Laser-Doppler frequency shift or the PALS method (full phase analysis) with non-polar or high ionic strength liquids; electrode design with linear electrical field to avoid electroosmotic streaming.

2.1) NanoBrook ZetaPlus

The NanoBrook ZetaPlus is a laboratory system for determination of mobility of particles using the Laser Doppler shift method. This is the traditional method where the modification of frequency of light interacting with moving particles is measured to calculate zeta potential. As a minimum travelling speed of particles is required to get reasonable signals, this method is limited to aqueous samples of moderate ionic strength.

2.2) NanoBrook ZetaPALS

The PALS-method does not measure frequency shift but the phase difference of scattered light compared to a reference beam. As the phase difference is much faster to detect, this method is up to 100 times more precise and reproducible than the traditional method. Only this method permits determinations in non-polar liquids (oils, organic solvents) or highly conductive suspensions (high salt concentrations).

2.3) BI-870

With the new BI-870 measuring of dielectric constants has never been so easy. Simply insert the probe in the liquid to be measured, adjust the two controls on the front panel and read the dielectric constant from the display. The BI-870 can accurately measure in low and high dielectric solvents, including mixed liquids and solutions.

2.4) BI-ZTU

BI-ZTU titration unit is offered as an accessory for the determination of zeta potential dependences. It enables recording of zeta potential values with changing pH values (determining the iso electric point) or of concentration of wetting agents. The ZTU prepares the sample and pumps it into a flow through electrode unit, control of the system is done through the software of the zeta potential analyser.