Size and Size Distribution of Gold Nanoparticles by SAXS

Gold nanoparticle dispersions were measured with the SAXSpace system. SAXS proved to be a well-suited method for determining the size distribution of a binary mixture of two dispersions comprising very small and at the same time similar particle size.

Determining particle size with SAXS

Many materials gain their properties from the grain size of their constituting particles. Examples are the activity of catalysts and enzymes, the mechanical stability of ceramics and the thermal, electrical and optical properties of nanoparticles.

Aggregate formation and imperfect re-dispersion may lead to an effective particle size in suspension much larger than the primary particle size. Coalescence is one of the main break-down processes in emulsions.

SAXS is a powerful technique to characterize particle suspensions with respect to their colloidal stability, aggregation and coalescence. This is due to the fact that large particles scatter a lot and are thus easily detectable. The SAXSpace system has proven to deliver excellent data well suited for determining the particle size and size distribution.

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