ISO 17867:2020-ed.2.0

Podrobné informácie

Označenie: ISO 17867:2020-ed.2.0

Dátum vydania: 05.10.2020

Stránok: 27

Krajina: Medzinárodná technická norma

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Anotácia

Description / Abstract: 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.