Small-angle X-ray scattering analysis of porous powders of CaCO3

The results of small‐angle and ultra‐small‐angle X‐ray scattering on porous CaCO3 microparticles of pulverulent vaterite made by a conventional chemical route and by using supercritical CO2 are presented. The scattering curves are analysed in the framework of the Guinier–Porod model, which gives the...

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Bibliographic Details
Published in:Journal of applied crystallography 2012-10, Vol.45 (5), p.881-889
Main Authors: Chavez Panduro, Elvia Anabela, Beuvier, Thomas, Fernández Martínez, Manuel, Hassani, Leila, Calvignac, Brice, Boury, Frank, Gibaud, Alain
Format: Article
Language:English
Subjects:
Calcium carbonate
Carbon dioxide
Crystallography
Fractal analysis
Invariants
Materials science
Microparticles
Porosity
Scattering
small-angle X-ray scattering
Surface chemistry
ultra-small-angle X-ray scattering
vaterite
X-rays
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Summary:The results of small‐angle and ultra‐small‐angle X‐ray scattering on porous CaCO3 microparticles of pulverulent vaterite made by a conventional chemical route and by using supercritical CO2 are presented. The scattering curves are analysed in the framework of the Guinier–Porod model, which gives the radii of gyration of the scattering objects and their fractal dimension. In addition, the porosity and the specific surface area are determined by using the Porod invariant, which is modified to take into account the effective thickness of the pellet. The results of this analysis are compared with those obtained by nitrogen adsorption.
ISSN:1600-5767
0021-8898
1600-5767
DOI:10.1107/S0021889812032219