Description
Zeta streaming potential analysis with the ZETA-Check
The ZETA-check is a zeta streaming potential and stability analysis system for colloids and dispersions.
Particle interface potentials like the oscillating zeta streaming potential measured in the ZETA-check, represent the level of electrostatic repulsion between particles. The potential is generated by ionic end groups on particles and macro-molecules, respectively. With ZETA-check, the state of the actual charge of dispersions and macromolecular solutions is obtained within seconds. Solutions and dispersions from 0.3 nm up to 100 µm particle size qualify for measurement. The typical concentration is between 0.01 and 40 vol%.
Method
The “heart” of the ZETA-check is a cylindrical PTFE beaker with an oscillating displacement piston. 1 or 5 – 10ml sample is given into the beaker. A fraction of the contained particles will be immobilised at the surface of the cell wall. By up and down movement of the piston the charge cloud of the electric double layer is pushed up and down the walls of the measurement device. The result is available at both electrodes as the oscillating zeta streaming potential ZSP. It is proportional to the particle charge quantity and the zeta potential present in the dispersion, respectively. Calibration is done with a macromolecular solution of known charge quantity or with a suspension of known zeta potential.
Up to 1000 data records are saved and can be queried later from a PC. One data record contains these information: data record No., time, measured value in mV. In case of no retrieval the data will be constantly overwritten. The results can be printed directly from the instrument with an optional printer. The ZETA-check is space-saving and easy to transport.
Interested in the ZETA-check? Request a quote or call us on +44(0)1954 232 776 to discuss your requirements.
