1 Scope
This document specifies a method for the application of small-angle X-ray scattering
(SAXS) to the estimation of mean particle sizes in the 1 nm to 100 nm size range. It is applicable in dilute dispersions where
the interaction and scattering effects between the particles are negligible. This document describes several data evaluation methods: the Guinier
approximation, model-based data fitting, Monte-Carlo–based data fitting, the indirect
Fourier transform method and the expectation maximization method. The most appropriate
evaluation method is intended to be selected by the analyst and stated clearly in
the report. While the Guinier approximation only provides an estimate for the mean
particle diameter, the other methods also give insight in the particle size distribution.
BS ISO 17867:2020 history
2020BS ISO 17867:2020 Particle size analysis. Small angle X-ray scattering (SAXS)
2015BS ISO 17867:2015 Particle size analysis. Small-angle X-ray scattering