Malvern Instruments

Molecular Weight Measurement Systems

Glossary of Common Dynamic Light Scattering Terms

Malvern Instruments

Mathematical descriptions of the terms used in dynamic light scattering are not always useful in understanding their potential applications. This whitepaper provides a glossary of definitions of a number of terms, with notes on their specific use in the context of dynamic light scattering.

Z-Average size

The Z-average size (or Z-average mean) is used in dynamic light scattering as a parameter also known as the cumulants mean. It is a primary and most stable parameter produced by the tecnique. The Z-average mean is the best value to report when used in a quality control setting as it is defined in ISO 13321 and more recently ISO 22412, which defined this mean as the 'harmonic intensity averaged particle diameter'.

To fidn out more about the Z-average size and other key terms including cumulants analysis, polydispersity index, diffusion coefficient, and hydrodynamic diameter, download this free whitepaper.

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