Speciation and crystal chemistry of Iron(III) chloride hydrolyzed in the presence of SiO4 ligands. 3. Semilocal scale structure of the aggregates

Authors
Masion, A Doelsch, E Rose, J Moustier, S Bottero, JY Bertsch, PM
Citation
A. Masion et al., Speciation and crystal chemistry of Iron(III) chloride hydrolyzed in the presence of SiO4 ligands. 3. Semilocal scale structure of the aggregates, LANGMUIR, 17(16), 2001, pp. 4753-4757
Citations number
35
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
LANGMUIR
ISSN journal
07437463 → ACNP
Volume
17
Issue
16
Year of publication
2001
Pages
4753 - 4757
Database
ISI
SICI code
0743-7463(20010807)17:16<4753:SACCOI>2.0.ZU;2-G
Abstract
A series of fresh and 7 day aged Fe-Si samples have been investigated at th e semilocal scale by small-angle X-ray scattering (SAXS), All the scatterin g curves are typical of amorphous aggregates. The subunits of the precipita tes 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 Angstrom. The high fractal dimension (D-f) values of the aggregates ran ging from about 2.0 to 2.7 are attributed to the presence of Si ligands. Ho wever, the value of D-f as a function of pH and Si concentration varies lin early with the polymerization state of iron.