Document Type

Article

Date

2-25-1986

Embargo Period

2-6-2013

Keywords

ALUMINA- X-Ray Analysis; MATHEMATICAL TRANSFORMATIONS - Fourier Transforms; SILICA - X-Ray Analysis; X-RAYS - Scattering; SMALL-ANGLE X-RAY SCATTERING; VORONOI CELL MODELS

Disciplines

Chemistry

Description/Abstract

Small-angle X-ray scattering (SAXS) can be used to obtain interphase surface areas of a system, such as a supported-metal catalyst, composed of internally homogeneous phases with sharp interphase boundaries. Measurements of SAXS for samples of porous silica, alumina, platinum on silica, and platinum on alumina are reported. A variety of models and forms for the correlation function, the Fourier transform of which gives the X-ray scattering, are considered, and theoretical and measured intensities are compared. A criterion of fit for comparing models with different numbers of parameters is proposed. It is shown that values for the single interphase surface area can be obtained independently of a model. However, fitting intensities using a model-based correlation function gives information about the structure of the system. The two-cell-size Voronoi and the correlated Voronoi cell models are useful in this regard.

Additional Information

Copyright 1986 Journal of Applied Crystallography. This article may be downloaded for personal use only. Any other use requires prior permission of the author and Journal of Applied Crystallography.

The article may be found at http://journals.iucr.org/j/issues/1986/05/00/a26378/a26378.pdf

Source

local input

Creative Commons License

Creative Commons Attribution 3.0 License
This work is licensed under a Creative Commons Attribution 3.0 License.

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Chemistry Commons

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