WALLIS – Zeta Potential AnalyserWALLISTM is an innovative high resolution Zeta potential analyser purely dedicated to nanoparticle and colloidal charge characterisation.
Based on a modern version of Laser Doppler Electrophoresis (LDE) technique. Ideal tool for studying colloidal suspension’s stability and nanoparticles’ electrophoretic properties.
- No electro-osmosis → Artifact-free measurements
- Improved LDE technology → Efficient, reliable & simple
- High-resolution measurement → Accurate & repeatable Zeta potential analysis
- High durability electrodes → robustness & cost-effectiveness
- Designed for standard disposable and quartz cuvette → Easy-to-fill, compatible with organic solvents and high-pH suspensions
- Advanced software functionalities (Time, pH, Temperature kinetic modes, SOPs, reporteditor, etc.)
- Easy-to-use and intuitive Graphical User Interface (GUI) software
Technologies & Innovations
- Simple and easy sample preparation ; no risk of bubble
- Robust : high durability vitreous carbon electrodes
- Artifact-free : optimized dip cell electrodes design → no electro-osmosis bias
- High resolution measurements : sampling frequency 30 times higher than competitors / significantly improving measurement resolution down to 0,1 mV
- Zeta potential measurement range: -200mV to +200 mV
- High resolution measurement: better than 0.1 mV
- Dip cell with unique high durability amorphous carbon electrodes
- ZetaQ proprietary software (lien vers onglet ZetaQ)
- Compliant with ISO 13099-2 Colloidal system – methods for Zeta potential determination – Part 2
Zeta potential (ζ)
Is a fundamental property of colloidal suspension related to the effective surface electrical charges of particles immersed in a solvent.
ζ measurement is very important because it gives an indication on formulation stability and electrophoretic properties of NPs. Zeta potential is measured by the well-known technique of Laser Doppler Electrophoresis
Laser Doppler Electrophoresis principle:
An alternative electrical field/voltage is applied between two electrodes immersed deeply in the colloidal suspension; the charged particles are forced into a translation motion (electrophoresis) with a speed (ν) proportional to the applied electrical field. The electrophoretic mobility is defined by the ratio between the particle speed and the applied field amplitude.