A further note on the activation energy of diffusion
SummaryThe activation energy of diffusion can be expressed in terms of thermodynamic quantities such as entropy and enthalpy of sorption. A substantial simplification to such a published expression is presented.
On the activation energy of diffusion of water in wood
SummaryThe diffusion equation for water in wood is expanded in terms of temperature and moisture gradient on the assumption that the driving force for the diffusion of water in wood is the partial pressure of water vapour. An analytic expression is then developed for the activation energy of diffusion in terms of enthalpy and entropy changes associated with the sorption process. The expression is compared with another published curve and some similarity was observed.
Adsorption und Kapillarkondensation: Theorien der Adsorption und Kapillarkondensation von Gasen und Dämpfen an festen Oberflächen und in porösen Körpern
IN this critical survey of the theories of the processes of adsorption, particular attention is directed to the limits of validity of the assumptions made in the various hypotheses, and the gaps between existing theories have been bridged by an application of the resources of modern physics. A unification of theory has been attempted, and the same basic principles have been applied to the whole range of adsorption phenomena. Irreversible processes—for example, chemical action—do not come within its scope; the knowledge of these branches is too incomplete to warrant the extension of the theory to them. The book has been written with the aim of its being intelligible to a public possessing no great mathematical knowledge.Adsorption und Kapillarkondensation: Theorien der Adsorption und Kapillarkondensation von Gasen und Dämpfen an festen Oberflächen und in porösen Körpern.Von Erich Hückel. (Kolloidforschung in Einzeldarstellungen, herausgegeben von Richard Zsigmondy, Band 7.) Pp. vii+308. (Leipzig: Akademische Verlagsgesellschaft m.b.H., 1928.) 20 gold marks.