Speciation and crystal chemistry of iron(III) chloride hydrolyzed in the presence of SiO4 ligands. 3. Semilocal scale structure of the aggregates
Armand Masion1, Emmanuel Doelsch1, Jérôme
Rose1, Stéphane Moustier1, Jean Yves Bottero1,
1CEREGE (UMR 6635 CAIRS Aix Marseille III), Europole Méditerranéen
de l'Arbois, BP 80,
Abstract: A series of fresh and 7 day aged Fe-Si samples have been investigated at the semilocal scale by small-angle X-ray scattering (SAXS). All the scattering curves are typical of amorphous aggregates. The subunits of the precipitates could not be determined precisely. However, the trend derived from SAXS modeling indicates that almost all the Fe is within subunits smaller than 7.5 Å. The high fractal dimension (Df) values of the aggregates ranging from about 2.0 to 2.7 are attributed to the presence of Si ligands. However, the value of Df as a function of pH and Si concentration varies linearly with the polymerization state of iron.
SREL Reprint #2552
Masion, A., E. Doelsch, J. Rose, S. Moustier, J. Y. Bottero, and P. M. Bertsch. 2001. Speciation and crystal chemistry of iron(III) chloride hydrolyzed in the presence of SiO4 ligands. 3. Semilocal scale structure of the aggregates. Langmuir 17:4753-4757.