Wallis

WALLIS – Zeta Potential Analyser WALLISTM 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. Key benefits 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 Dip cell : simple, robust, artifact-free 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 Main Characteristics 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 (?) Is a fundamental property of colloidal suspension related to the effective surface electrical charges of particles immersed in a solvent. ? 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 WALLIS - Meritics - Zeta Potential 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 (?) proportional to the applied electrical field. The electrophoretic mobility is defined by the ratio between the particle speed and the applied field amplitude.

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