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Titolo:
Stability of silver clusters in mordenites with different SiO2/Al2O3 molarratio
Autore:
Bogdanchikova, NE; Petranovskii, VP; Machorro, R; Sugi, Y; Soto, VM; Fuentes, S;
Indirizzi:
UNAM, Ctr Ciencias Mat Condensada, Mexico City 22800, DF, Mexico UNAM Mexico City DF Mexico 22800 ondensada, Mexico City 22800, DF, Mexico CICESE, Mexico City 22800, DF, Mexico CICESE Mexico City DF Mexico 22800CICESE, Mexico City 22800, DF, Mexico Gifu Univ, Gifu 50511, Japan Gifu Univ Gifu Japan 50511Gifu Univ, Gifu 50511, Japan
Titolo Testata:
APPLIED SURFACE SCIENCE
fascicolo: 1-4, volume: 150, anno: 1999,
pagine: 58 - 64
SICI:
0169-4332(199908)150:1-4<58:SOSCIM>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
AQUEOUS-SOLUTION; ABSORPTION-SPECTRA; PULSE-RADIOLYSIS; AG+ IONS; ATOMS; REDUCTION; STABILIZATION; AGGREGATION; MATRICES; GROWTH;
Keywords:
silver clusters; stability; mordenites;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Bogdanchikova, NE UNAM, POB 439036, San Ysidro, CA 92143 USA UNAM POB 439036 San Ysidro CA USA 92143 ro, CA 92143 USA
Citazione:
N.E. Bogdanchikova et al., "Stability of silver clusters in mordenites with different SiO2/Al2O3 molarratio", APPL SURF S, 150(1-4), 1999, pp. 58-64

Abstract

The stability and decay of silver clusters characterized by absorption bands 320 and 285 nm incorporated in mordenites with different SiO2/Al2O3 molar ratios were studied under ambient conditions. Significantly different rates of disappearance of these two bands were the basis for assigning them todifferent silver species. Oxidation converts the clusters peaking at 320 and 285 nm into other silver clusters characterized by absorption bands at 310 and 240 nm, respectively. The oxidation of silver clusters peaking at 285 nm is significantly faster than that at 320 nm. The stability of both original clusters decreases with acid site strength that, in its turn, dependson SiO2/Al2O3, molar ratio. The minimum lifetime of clusters peaking at 320 and 285 nm equal to ca. 40 and 20 days, respectively, was observed for mordenite characterized by the strongest acid sites. For mordenites possessing weaker acid sites, the lifetime of these clusters is found to be more than 50 months. The oxidation of silver clusters is reversible, and re-reducedsilver clusters were revealed to possess the same electron structure as original ones. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 04:22:26