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- W2012807122 abstract "We studied, in situ and in real time, the optical absorption spectrum of small silver particles supported on silica. A reversible change induced by a change of ambient gas between 5%H2/He and 1%O2/He was observed at temperatures between 373 and 573 K. Calculations of the optical spectrum of small silver particles were made using the Maxwell-Garnett theory with respect to the effects of a change in particle shape and the formation of a surface oxide layer. Comparison of experimental with calculated spectra indicates a reversible change in the shape of silver particles between spherical in 5%H2/He and oblate-spheroidal in 1%O2/He. The change was rapid and enhanced with increasing temperature. The mechanism of this phenomenon is discussed, using a model in which the small supported silver particle is treated as a liquid droplet on a solid surface: The adsorption and desorption of oxygen causes a large change in the surface stress of the droplet." @default.
- W2012807122 created "2016-06-24" @default.
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- W2012807122 date "1992-03-01" @default.
- W2012807122 modified "2023-10-09" @default.
- W2012807122 title "In situ optical observation of oxygen-adsorption-induced reversible change in the shape of small supported silver particles" @default.
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- W2012807122 doi "https://doi.org/10.1016/0039-6028(92)90173-4" @default.
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