Pore size dependent behavior of hydrated Ag+ ions confined in mesoporous MCM-41 materials under synchrotron X-ray irradiation.
The behavior of hydrated Ag+ ions in a 1.5 mol dm(-3) AgNO3 aqueous solution confined in mesoporous silica MCM-41 with different pore sizes was characterized by synchrotron X-ray absorption spectroscopy. The hydrated Ag+ ions are stabilized in 4-fold coordination down to 195 K in the pores (21 Å in diameter), whereas in the larger pores (28 Å) the hydrated Ag+ ions are reduced to Ag0 to form nano clusters with the Ag-Ag interactions of 2.80 Å.
Department of Chemistry, Faculty of Science, Fukuoka University, Jonan, Fukuoka, Japan.
Kanae
K
Ito
Koji
K
Yoshida
Shigeharu
S
Kittaka
Toshio
T
Yamaguchi
D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D012835:Silver Nitrate / Q000737:chemistry*; D012996:Solutions; D017356:Synchrotrons; D013696:Temperature; D014867:Water / Q000737:chemistry*; D056928:X-Ray Absorption Spectroscopy / Q000295:instrumentation*
C509968:MCM-41; D012996:Solutions; D014867:Water; D012822:Silicon Dioxide; D012835:Silver Nitrate