TY - JOUR
T1 - Characterization of fine particles of different iron oxides formed in aqueous media
AU - Suzuki, Shigeru
AU - Suzuki, Shinya
AU - Kwon, Sang Koo
AU - Kanie, Kiyoshi
AU - Muramatsu, Atsushi
AU - Waseda, Yoshio
AU - Sakurai, Masaki
AU - Matsubara, Eiichiro
AU - Okui, Makoto
AU - Fukushima, Sei
PY - 2006/4/12
Y1 - 2006/4/12
N2 - Small-angle X-ray scattering (SAXS) measurements using synchrotron radiation and transmission electron microscopy (TEM) observation have been carried out for characterizing fine particles of ferric oxides including hydroxides and oxyhydroxides. A compact chamber was designed for SAXS measurements at BL15XU of SPring-8, Japan. SAXS profiles of reference particles of ferric oxyhydroxides, namely, α-FeOOH (goethite), β-FeOOH (akaganetite), and γ-FeOOH (lepidocrocite), obtained using the measurement system were compared with their morphologies observed by TEM. SAXS profiles of fine particles of ferric oxides, that were converted from condensed Fe(OH) 3 gel to β-FeOOH and α-Fe2O3 by aging, were also measured. While TEM observation provided information on the characteristic microstructure of well-crystallized fine particles of ferric oxides in a selected area of a sample, information regarding fine particles including poorly crystallized ferric oxides in the entire sample was obtained by SAXS measurements. The SAXS and TEM results indicated that the addition of foreign anions of sulfate or silicate to the gel delayed the conversion processes of the gel to β-FeOOH and α-Fe2O3. A combination of SAXS measurement with TEM observation and X-ray diffraction measurement is shown to be effective in the characterization of fine particles of different iron oxides, which are formed by aging in aqueous media.
AB - Small-angle X-ray scattering (SAXS) measurements using synchrotron radiation and transmission electron microscopy (TEM) observation have been carried out for characterizing fine particles of ferric oxides including hydroxides and oxyhydroxides. A compact chamber was designed for SAXS measurements at BL15XU of SPring-8, Japan. SAXS profiles of reference particles of ferric oxyhydroxides, namely, α-FeOOH (goethite), β-FeOOH (akaganetite), and γ-FeOOH (lepidocrocite), obtained using the measurement system were compared with their morphologies observed by TEM. SAXS profiles of fine particles of ferric oxides, that were converted from condensed Fe(OH) 3 gel to β-FeOOH and α-Fe2O3 by aging, were also measured. While TEM observation provided information on the characteristic microstructure of well-crystallized fine particles of ferric oxides in a selected area of a sample, information regarding fine particles including poorly crystallized ferric oxides in the entire sample was obtained by SAXS measurements. The SAXS and TEM results indicated that the addition of foreign anions of sulfate or silicate to the gel delayed the conversion processes of the gel to β-FeOOH and α-Fe2O3. A combination of SAXS measurement with TEM observation and X-ray diffraction measurement is shown to be effective in the characterization of fine particles of different iron oxides, which are formed by aging in aqueous media.
KW - Iron Oxide
KW - Surface-liquid interfaces
KW - X-ray Scattering
UR - http://www.scopus.com/inward/record.url?scp=33645774821&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33645774821&partnerID=8YFLogxK
U2 - 10.1380/ejssnt.2006.352
DO - 10.1380/ejssnt.2006.352
M3 - Article
AN - SCOPUS:33645774821
SN - 1348-0391
VL - 4
SP - 352
EP - 358
JO - e-Journal of Surface Science and Nanotechnology
JF - e-Journal of Surface Science and Nanotechnology
ER -