19/30376087 DC - BS ISO 17867. Determination of particle size distribution. SAXS method

19/30376087 DC

BS ISO 17867. Determination of particle size distribution. SAXS method

Status : Current, Draft for public comment   Published : August 2019



Small-angle X-ray scattering (SAXS) is a well-established technique that allows structural information to be obtained about inhomogeneities in materials with characteristic lengths typically ranging from 1 nm to 100 nm. Under certain conditions (narrow size distributions, appropriate instrumental configuration, and idealised shape) the limit of 100 nm can be significantly extended. This International Standard specifies a method for the application of SAXS to the estimation of mean particle sizes in dilute dispersions where the interaction and scattering effects between the particles are negligible. This International Standard 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 shall 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.

Standard Number19/30376087 DC
TitleBS ISO 17867. Determination of particle size distribution. SAXS method
StatusCurrent, Draft for public comment
Publication Date06 August 2019
Normative References(Required to achieve compliance to this standard)ISO 92762, ISO 26824, ISO 92761, ISO/TS 27687
Informative References(Provided for Information)No other standards are informatively referenced
International RelationshipsISO/DIS 17867
Draft Expiry Date25 September 2019
DescriptorsDispersions (chemical), Optical measurement, Suspensions (chemical), Particulate materials, Particle size distribution, Particle size measurement, Microscopic analysis
Title in FrenchDétermination de la distribution granulométrique — Méthode SAXS
File Size1.804 MB
NotesWarning: this draft is not current beyond its expiry date for comments.

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