Zeta potential probe DT-300 and DT-310 when titration is included.
These instruments have Zeta potential probe that allows characterizing concentrated dispersions and emulsions with no dilution. They yield information on the following parameters:
– zeta potential in concentrated dispersions and emulsions when volume fraction >1 %
– electric surface charge density when conductivity known
– iso-electric point when model DT310
– optimum dose of surfactant
– sedimentation stability of the sample
– presence of small amounts of large sedimenting particles
Zeta potential probe can be simply inserted into the sample. Alternatively, a plastic cup on the top face of the probe serves as a sample holder. Accordingly, the sample volume in this setup is under 1 ml.
There are several options available for this instrument. Conductivity probe allows monitoring ionic strength and estimate Debye length when samples are aqueous. In case when samples are non-aqueous, standalone instrument DT700 yields conductivity for such calculations. Temperature and pH probe are also optional.
Advantages over micro-electrophoresis and ELS:
- no dilution when volume fraction up to 50%
- less sensitive to contamination
- higher precision (± 0.1 mV)
- low charges (down to 0.1 mV)
- electro-osmotic flow is not important
- convection is not important
- accurate for non-aqueous dispersions