Particle size and zeta potential are important parameters for the characterization of nanoparticles. The technique of dynamic light scatteringis well suited to the measurement of the size of nanoparticle dispersions. Traditionally, measurement of very small and/or poorly scattering particles or samples that are very dilute were difficult unless high powered lasers were used. These problems have been addressed in a light scattering instrument incorporating novel non-invasive backscatter optics (NIBS^®). This novel optic arrangement maximises the detection of scattered light while maintaining signal quality.

Laser Doppler electrophoresis is an accepted method for the measurement of particle mobility and zeta potential of dispersions of colloidal size materials. A novel sheme using a combination of Phase Analysis Light Scattering (PALS) and a pathented method of measurement called M3 to improve the accuracy and ease of use of the technique will be discussed.

These technologies have been incorporated in the Zetasizer Nano Series of instruments from Malvern Instruments Ltd (Malvern, Worcestershire, UK). Examples of the application of these novel light scattering techniques to a wide range of nanoparticle samples will be presented which will illustrate the capabilities of the technology.

* Dr Michael Kaszuba is the product technical specialist in Malvern Instruments Ltd, UK

** Dr Adam Prochniak is the exclusive representative of Malvern Instruments Ltd in Poland

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1. Nanoparticle size and zeta potential analysers Zetasizer and NanoSight from Malvern Instruments.
2. Charakteryzacja nanocząstek z pomocą analizatora Zetasizer Nano ZS firmy Malvern Instruments