Surface Segregation and Adsorption on Surfaces


Book Description

Surface Science is understood as a relatively young scientific discipline, concerned with the physical and chemical properties of a phenomena on clean and covered solid surfaces, studied under a variety of conditions. The adsorption of atoms and molecules on solid surfaces is, for example, such a condition, connected with more or less drastic changes of all surface properties. An adsorption event is frequently observed in nature and found to be of technical importance in many industrial processes. For this reason, Surface Science is interdisciplinary by its very nature, and as such an important intermediary between fundamental and applied research.




Surface Segregationphenomena


Book Description

The purpose of this book is to discuss the phenomena associated with the segregation of one element in a multicomponent material. It describes the kinetics of segregation and contains a tabular summary of the pros and cons of the various models. The easy-to-read chapters outline in detail the macroscopic approach and provide an in-depth review of broken-bond models. This comprehensive informative resource also addresses important multicomponent systems. These systems include metals with non-metallic constituents, semiconductor-metal interfaces, steels and steel-related alloys, and real catalysts. Readers of this text will gain a good fundamental understanding and overview of surface, interfacial, and selvedge segregation. Those who have an interest in physics, vacuum science, material science, and chemical, mechanical, and electrical engineering will benefit from this imperative work.




Surface Segregation and Adsorption on Surfaces


Book Description

Surface Science is understood as a relatively young scientific discipline, concerned with the physical and chemical properties of a phenomena on clean and covered solid surfaces, studied under a variety of conditions. The adsorption of atoms and molecules on solid surfaces is, for example, such a condition, connected with more or less drastic changes of all surface properties. An adsorption event is frequently observed in nature and found to be of technical importance in many industrial processes. For this reason, Surface Science is interdisciplinary by its very nature, and as such an important intermediary between fundamental and applied research.




Surface Segregation


Book Description

The book presents the fundamental aspects of surface segregation theory. The material is presented in a self-contained manner and mathematical procedures are worked through in some cases in order to provide the reader with the necessary opportunity to realize the restrictions under which the expressions are valid.




Adsorption on Metal Surfaces


Book Description

Evolution in methods of investigation and concepts; Properties of clean metal substrates; Equilibrium adsorption and surface segregation; Structure and crystallography of adsorbed layers; Epitaxial growth: the problem of the interface; Effects of adsorption on some fundamental substrate properties; Adsorption - desorption kinetics and catalysis on single crystals; Influence of adsorption on electrochemical properties; Composition of grain boundaries in binary alloys; The influence of chemisorption on adhesion and friction.




The Chemical Physics of Solid Surfaces


Book Description

The Chemical Physics of Solid Surfaces, Volume 6: Coadsorption, Promoters, and Poisons focuses on the processes, reactions, and approaches involved in coadsorption and the functions of promoters and poisons in synthesis and reactions. The selection first offers information on adsorbate-adsorbate interactions on metal surfaces and interaction between alkali metal adsorbates and adsorbed molecules. Discussions focus on coadsorption of alkali metals and other molecules; model experiments of catalyst promotion; effective medium theory; direct and indirect hybridization effects; and elastic interaction between adsorbates. The publication then ponders on coadsorption of carbon monoxide and hydrogen on metal surfaces and adsorption on bimetallic surfaces. The manuscript examines the chemical properties of alloy single crystal surfaces and promotion in ammonia synthesis. Topics include substrate dependence of nitrogen adsorption and ammonia synthesis; effects of promotion on nitrogen dissociation and ammonia synthesis; and theoretical modeling. The text then elaborates on promotion in the Fischer-Tropsch hydrocarbon synthesis, promoters and poisons in the water-gas shift reaction, and strong metal-support interactions. The selection is a recommended reference for physicists and readers interested in coadsorption, promoters, and poisons.




Surface Alloys and Alloy Surfaces


Book Description

DescriptionSurface Alloys and Alloy Surfaces is concerned with the structural, compositional, electronic and chemical properties of the surfaces of solids in which the surface layers, at least are alloyed. Two different categories of system are covered - the surfaces of bulk alloys (alloy surfaces) and surface phases in which one or more outermost atomic layers are alloyed, while the underlying bulk involves no such intermixing (surface alloys).Importance of TopicThe surfaces of bulk alloys have long been known to be of practical interest for their chemical properties. It has also long been known that the surface composition of such alloys commonly differs from that of the underlying bulk. However, our understanding of these chemical and physical phenomena is far from complete and the application of surface science methods to investigate these phenomena is a manifestation of a general trend to study the surfaces of increasing complexity. Surface alloy formation, as a much more recently recognized phenomenon deserves more attention.Why This TitleThis title is important as it provides new insights into a mixture of new and old problems. It is the first to cover the important mixture of material on surface alloys and alloy surfaces. Each chapter is written by experts in different areas of these two interrelated topics, covering theory and experiment, physics and chemistry, geometrical and electronic structure. The coverage of the surface alloy topic is especially novel as it is relatively newly-recognised as quite a common phenomenon.




Surface Segregation and Adsorption on Surfaces


Book Description

Surface Science is understood as a relatively young scientific discipline, concerned with the physical and chemical properties of a phenomena on clean and covered solid surfaces, studied under a variety of conditions. The adsorption of atoms and molecules on solid surfaces is, for example, such a condition, connected with more or less drastic changes of all surface properties. An adsorption event is frequently observed in nature and found to be of technical importance in many industrial processes. For this reason, Surface Science is interdisciplinary by its very nature, and as such an important intermediary between fundamental and applied research.




Films on Solid Surfaces


Book Description

Films on Solid Surfaces presents the physics and chemistry of physical adsorption. This book contains 10 chapters that are ordered according to the flow of a course given in a graduate study in University of Washington during 1973. The introductory chapter presents the motivation for the completion of the book. As the motivating factors are established, the book follows with the topic on atomic nature of physical adsorption and the states of single adsorbed atoms. A review of experimental techniques for the study of solid surfaces and films is given, as well as a discussion of substrate preparation and equilibrium thermodynamics. The various states of films and their phase transitions encompass four chapters. Lastly, the book also reviews thin film superfluidity. This book specifically caters to scientists in the fields of physics and biology working on physical adsorption and surface science.




Surface Segregation in Multicomponent Systems


Book Description

The study of surface segregation, although of great technological importance, has been largely restricted to experimental work due to limitations associated with theoretical methods. However, recent improvements in both first-particle and semi-empirical methods are opening, the doors to an array of new possibilities for surface scientists. We apply one of these techniques, the Bozzolo, Ferrante and Smith (BFS) method for alloys, which is particularly suitable for complex systems, to several aspects of the computational modeling of surfaces and segregation, including alloy surface segregation, structure and composition of alloy surfaces, and the formation of surface alloys. We conclude with the study of complex NiAl-based binary, ternary and quaternary thin films (with Ti, Cr and Cu additions to NiAl). Differences and similarities between bulk and surface compositions are discussed, illustrated by the results of Monte Carlo simulations. For some binary and ternary cases, the theoretical predictions are compared to experimental results, highlighting the accuracy and value of this developing theoretical tool.Bozzolo, Guillermo and Ferrante, John and Noebe, Ronald D. and Good, Brian and Honecy, Frank S. and Abel, PhillipGlenn Research CenterMETAL SURFACES; THIN FILMS; SURFACE STABILITY; ALLOYS; SEPARATION; MONTE CARLO METHOD; NICKEL ALUMINIDES