Time-Resolved Inverse Gas Chromatography and Its Applications

Nicholas A. Katsanos and George Karaiskakis

$55.00
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June 2004
180 pp.

ISBN: 0-9728061-0-5

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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.

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