Pore size dependent behavior of hydrated Ag+ ions confined in mesoporous MCM-41 materials under synchrotron X-ray irradiation

Kanae Ito; Koji Yoshida; Shigeharu Kittaka; Toshio Yamaguchi

doi:10.2116/analsci.28.639

Pore size dependent behavior of hydrated Ag+ ions confined in mesoporous MCM-41 materials under synchrotron X-ray irradiation

Anal Sci. 2012;28(7):639-41. doi: 10.2116/analsci.28.639.

Authors

Kanae Ito¹, Koji Yoshida, Shigeharu Kittaka, Toshio Yamaguchi

Affiliation

¹ Department of Chemistry, Faculty of Science, Fukuoka University, Jonan, Fukuoka, Japan.

PMID: 22790363
DOI: 10.2116/analsci.28.639

Abstract

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.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Porosity
Silicon Dioxide / chemistry*
Silver Nitrate / chemistry*
Solutions
Synchrotrons*
Temperature
Water / chemistry*
X-Ray Absorption Spectroscopy / instrumentation*

Substances

MCM-41
Solutions
Water
Silicon Dioxide
Silver Nitrate