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No. 29 offers new insights into the energies of activation of electrode reactions and the interfacial behavior of proteins.



1. Energies of Activation of Electrode Reactions: A Revisited Problem

A century has passed since Roszkowsky in 1894 indicated in Zeitschrift für Physikalische Chemie that the electrode potential of the hydrogen evolution reaction, taken at constant current density, is affected by temperature.1 His paper was the first report on the effect of temperature on the kinetics of electrode reactions. During the next half century after the publication of Roszkowsky’s paper, however, studies of temperature effects in electrode kinetics were scarce and involved mostly determinations of temperature coefficients of the potential or overpotential for a few electrode reactions.2-18
Darko B. Šepa

2. The Electrochemical Activation of Catalytic Reactions

The use of electrochemistry to activate and precisely tune heterogeneous catalytic processes is a new development1-7 which originally emerged due to the existence of solid electrolytes. Depending on their composition, these specific anionic or cationic conductor materials exhibit substantial electrical conductivity at temperatures between 25 and 1000°C. Within this broad temperature range, which covers practically all heterogeneous catalytic reactions, solid electrolytes can be used as reversible in situ promoter donors or poison acceptors to affect the catalytic activity and product selectivity of metals deposited on solid electrolytes in a very pronounced, reversible, and, to some extent, predictable manner.
Constantinos G. Vayenas, Milan M. Jaksic, Symeon I. Bebelis, Stylianos G. Neophytides

3. Effect of Surface Structure and Adsorption Phenomena on the Active Dissolution of Iron in Acid Media

An understanding at the molecular level of the processes leading to iron corrosion and of the complex factors influencing it have long been considered a sine qua non condition for progress in the field of corrosion research. During its long history,1-240 this research has provided the scientific background for attempts to master, to prevent, or at least to minimize all kinds of corrosion phenomena as well as to elaborate new highly corrosion-resistant materials. Uniform corrosion in aqueous acid electrolytes is one of the most important corrosion phenomena in practice, being encountered in many branches of the chemical and related industries, during the cleaning of heat-transfer surfaces in traditional power plants, and in the reprocessing of nuclear fuel and decontamination of heavy water reactors. Insight into the processes leading to iron corrosion has mainly come from the study of electrode kinetics using electrochemical methods in conjunction with surface-morphological and crystallographic investigations and chemical analysis of the electrolyte.
Ileana-Hania Plonski

4. Electrochemical Investigations of the Interfacial Behavior of Proteins

A number of studies have been made on the interaction of proteins with solid surfaces in an attempt to determine the molecular conformation or orientation of the adsorbed molecules. This interest in the interfacial behavior of proteins at solid surfaces originates from the need to better understand the mechanisms of processes associated with their use in advanced technical applications and industrial problems. The use of immobilized enzymes in analytical techniques in biotechnology and in chromatography requires knowledge of the interfacial behavior of proteins. Adsorption of proteins and enzymes on various kinds of adsorbents is widely used for the purification, identification, fixation, and separation of these materials.1 The interaction of proteins with solid surfaces causes major problems in many industrial and medical areas, such as the “fouling” of surfaces in the food processing industry and in medical implant devices and biosensors, as well as microbial growth due to protein adhesion to surfaces. The mechanism of protein interactions with surfaces of artificial materials as well as the ability to control these processes are of great interest for such areas as molecular electronics, biometrics, biocompatible materials, drug release systems, and immunoassays.2
Sharon G. Roscoe

5. Chemisorption of Thiols on Metals and Metal Sulfides

This chapter reviews the adsorption of thiols at metal and metal sulfide surfaces. The motivation for studying these systems derives from the interaction of this interesting group of organic compounds with native metal and sulfide mineral surfaces being the key chemical step in the separation and concentration of such minerals from their ores by froth flotation. A number of different species can be formed by the interaction of thiols with metals and sulfides, the identity of the adsorbate depending on the particular thiol and mineral, the adsorption conditions, and the extent of reaction. This review focuses on the chemisorbed species formed in these systems. The concept of chemisorption is one of the formation of chemical bonds between the thiol and atoms in the mineral surface without removal of component atoms from their positions in the metal or metal sulfide lattice.
Ronald Woods


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