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Books > Science & Mathematics > Chemistry > Physical chemistry > Colloid chemistry
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Dynamic Processes on Solid Surfaces (Hardcover, 1993 ed.)
Loot Price: R4,572
Discovery Miles 45 720
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Dynamic Processes on Solid Surfaces (Hardcover, 1993 ed.)
Series: Fundamental and Applied Catalysis
Expected to ship within 10 - 15 working days
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When we see a jumbo jet at the airport, we sometimes wonder how
such a huge, heavy plane can fly high in the sky. To the extent
that we think in a static way, it is certainly not understandable.
In such a manner, dynamics yields behavior quite different from
statics. When we want to prepare an iron nitride, for example, one
of the most orthodox ways is to put iron in a nitrogen atmosphere
under pressures higher than the dissociation pressure of the iron
nitride at temperatures sufficiently high to let the nitrogen
penetrate into the bulk iron. This is the way thermodynamics tells
us to proceed, which requires an elaborate, expensive high-pressure
apparatus, sophisticated techniques, and great efforts. However, if
we flow ammonia over the iron, even under low pressures, we can
easily prepare the nitride-provided the hydrogen pressure is
sufficiently low. Since the nitrogen desorption rate is the
determining step of the ammonia decomposition on the iron surface,
the virtual pressure of nitrogen at the surface can reach an
extremely high level (as is generally accepted) because, in such a
dynamic system, the driving force of the ammonia decomposition
reaction pushes the nitrogen into the bulk iron to form the
nitride. Thus, dynamics is an approach considerably different from
statics.
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