Abstract
Controlled atmosphere electron microscopy has been used to continuously follow the behavior of silver particles supported on graphite when heated in the presence of various gases including helium, hydrogen and water vapor. In dry systems particles were observed to exhibit mobility over the range 320°–515°C. When water vapor was introduced either continuously or as a pulse injection particle motion was suppressed. At higher temperatures all systems showed similar behavior irrespective of the nature of the gas. Silver particles tended to collect into large globular islands at 615°C, and in this form showed characteristics of the bulk metal rather than those associated with small discrete particles. When the temperature was raised to 960°C discrete particles re-formed and once again exhibited mobility. This sequence of events and possible reasons for the inhibition of particle movement by water vapor is discussed.
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