Surface Roughness Created by Acidic Dissolution of Synthetic Goethite Monitored with SAXS and N2-Adsorption Isotherms
✍ Scribed by Peter G. Weidler; Gabor Degovics; Peter Laggner
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 714 KB
- Volume
- 197
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
Ismail and Pfeifer (7). Since then, an approach based on The development of surface roughness of two synthetic goethites the mathematical description of the adsorption isotherm by with a high, 176 m 2 /g, and a low, 7 m 2 /g, initial specific surface the BET-and FHH-theory has been very successfully used area by acid attack is described in terms of fractal geometry. The to evaluate the fractal dimension of surfaces (6, 7).
dissolution kinetics were influenced by the presence of micropores
Another method capable of describing self-similar or selfand small mesopores created during dissolution and leading to an affine surfaces is small angle X-ray scattering (SAXS) (8-12). initial increase in surface area causing S-shaped dissolution curves.
Different experiments of the dissolution of iron-
The fractal dimensions were calculated from the adsorption iso-( hydr ) oxides have been carried out and yielded a wide therms obtained with N 2 as adsorbate. These values of surface spectrum of dissolution kinetics ( 14,29 ) . So far no experfractal dimension agree quite well with the values of the mass and surface fractal dimension obtained with small angle X-ray iment has been conducted to monitor the changes in surscattering (SAXS).