DT-300 zeta potential with no dilution

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