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Time-Resolved Inverse Gas Chromatography and Its Applications |
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Nicholas A. Katsanos and George Karaiskakis |
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$55.00 |
June 2004 |
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Preface
Time-resolved chemistry allows the
study of chemical kinetics mechanism of structural changes and the
identification of important but easily overlooked transient structural
intermediates. The practical applications of time-resolved studies cover a broad
range of chemistry and biophysics, as well as materials.
Gas chromatography is a technique
of separating substances. Although similar to distillation techniques, it can
also be used to separate physicochemical quantities by means of inverse gas
chromatography (IGC). This method records properties of the stationary phase
statistically weighted over the time period of the measurement of the
chromatographic band. Since gas-liquid chromatography is based on the properties
of heterogeneous solid surfaces, every physicochemical quantity so determined,
such as adsorption energy, represents the weighted mean of a surface variate
distributed over the time of measurement. Therefore, it is not a time-resolved
methodology.
In contrast, IGC can become time resolved
and, therefore, record properties that are local with respect to time. These do
not involve all adsorption sites, but only those active at a certain time t
with respect to a chosen property. This monograph shows how the method can be
used to record such properties as time adsorption energies, local monolayer
capacities, local isotherms, energy distribution functions, adsorption rates
with lateral molecular interactions, surface diffusion coefficients,
effectiveness factors in heterogeneous catalysis, and surface energy on
heterogeneous surfaces of solids. The time-resolved character of the methods
described, the heterogeneity of the chromatographic surfaces, and the relevant
measurements and calculations are explained. The last chapter explores some
important practical applications of time-resolved IGC in various scientific and
industrial fields.
The book will appeal to
chromatographers, materials scientists, and investigators of heterogeneous
catalysis and interfacial science, as well as researchers and postgraduate
students in analytical and environmental chemistry.