Download or read book Surface Diffusion of Hydrogen on Carbon written by Andrew J. Robell and published by . This book was released on 1964 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Basic Study of Gas solid Interactions I Interaction of Hydrogen with Platinized Carbon written by Andrew J. Robell and published by . This book was released on 1964 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: It has been confirmed that the dispersion of platinum on the surface of Spheron-6 carbon increases the adsorption of hydrogen, both in rate and in amount. This excess adsorption, which is too great to be accounted for by the platinum alone, has been measured at 300 to 392 degrees C, at pressures from 30 to 60 cm Hg, and at Pt contents of 0.2 percent and 1.0 percent by weight. The observed dependence of the excess adsorption on these variables and the results of deuterium adsorptions point to a mechanism pictured as follows: Hydrogen adsorbs and dissociates quickly on the Pt. Around the Pt a zone is established which is in equilibrium with the gas phase. This zone acts as a source for surface diffusion of H atoms along the carbon surface. Alternate mechanisms are discussed and rejected. The proposed model is described quantitatively and adequate agreement is obtained with experiment. Within the framework of the model, the activation energy for surface diffusion is 39.2 kcal/g-atom H, and the surface diffusion coefficient at 392C is 5.77 times 10 to the -17th power sq cm/sec. (Author).
Download or read book Diffusion in Carbon Allotropes written by David J. Fisher and published by Trans Tech Publications Ltd. This book was released on 2013-06-13 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon has always been an essential feature of human civilisation (not to mention the human constitution), whether as mere fuel, as an expensive bauble or as an essential component of those two supporting pillars (organic chemicals, steel) of the industrial revolution. Even since its recognition as an element, 21?4 centuries ago, it has never ceased to offer new surprises and properties. Just decades ago, students had to contend with only two main forms, graphite and diamond, but nowadays there is a plethora of nanotubes, fullerenes, graphenes, etc. The present volume offers a compilation (over 400 items) of data on mass diffusion, in all of the various known allotropes of carbon, spanning some 6 decades.
Download or read book Diffusion at Interfaces Microscopic Concepts written by Michael Grunze and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diffusion in solids and at interfaces is a very active area of research, as the contributions to this volume attest.
Download or read book Surface Diffusion and Reaction of Diatomic Molecules on Pt 111 written by Vincent John Kwasniewski and published by . This book was released on 1991 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface Diffusion written by M.C. Tringides and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 701 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interest in the problem of surface diffusion has been steadily growing over the last fifteen years. This is clearly evident from the increase in the number of papers dealing with the problem, the development of new experimental techniques, and the specialized sessions focusing on diffusion in national and international meetings. Part of the driving force behind this increasing activity is our recently acquired ability to observe and possibly control atomic scale phenomena. It is now possible to look selectively at individual atomistic processes and to determine their relative importance during growth and reactions at surfaces. The number of researchers interested in this problem also has been growing steadily which generates the need for a good reference source to farniliarize newcomers to the problem. While the recent emphasis is on the role of diffusion during growth, there is also continuing progress on the more traditional aspects of the problem describing mass transport in an ensemble of particles. Such a description is based on the statistical mechanical analysis of a collection of particles that mutually interact and develop correlations. An average over the multitude of atomistic processes that operate under these conditions is necessary to fully describe the dynamics in the system.
Download or read book Spillover and Mobility of Species on Solid Surfaces written by A. Guerrero-Ruiz and published by Elsevier. This book was released on 2001-08-02 with total page 501 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Spillover and Mobility of Species and Solid Surfaces" collects the papers which were presented at the Fifth International Conference Spillover, either as oral or poster contributions, as well as the summaries of the invited lectures. This congress and its publication in the Studies on Surface Science and Catalysis series follow the tradition of previous conferences on spillover, initiated in Lyon, 1983, and continued in Leipzig, 1989, Kyoto 1993 and Dalian, 1997. For the fifth conference, held in S.L. el Escorial (Madrid), the organising committee has attempted to compile representative contributions which illustrate the advances in understanding the spillover phenomenon since 1997. Spillover is a process taking place during the interface of gas reactant molecules (mainly hydrogen and oxygen) on solid surfaces. However, different contributions to the more general area of the chemistry at surfaces, related with the mobility and migration of species, diffusion through membranes, fuel cell catalysts, etc., have also been included. In fact the title of the present volume summarizes this attempt to extend the conference topics towards dynamics at surfaces.Among the 70 contributions received, the 56 accepted papers were selected on the basis of the reports of at least two international reviewers, according to standards comparable to those applied for other specialised journals. These papers are from 21 different countries.
Download or read book Encyclopedia of Interfacial Chemistry written by and published by Elsevier. This book was released on 2018-03-29 with total page 5276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Encyclopedia of Interfacial Chemistry: Surface Science and Electrochemistry, Seven Volume Set summarizes current, fundamental knowledge of interfacial chemistry, bringing readers the latest developments in the field. As the chemical and physical properties and processes at solid and liquid interfaces are the scientific basis of so many technologies which enhance our lives and create new opportunities, its important to highlight how these technologies enable the design and optimization of functional materials for heterogeneous and electro-catalysts in food production, pollution control, energy conversion and storage, medical applications requiring biocompatibility, drug delivery, and more. This book provides an interdisciplinary view that lies at the intersection of these fields. Presents fundamental knowledge of interfacial chemistry, surface science and electrochemistry and provides cutting-edge research from academics and practitioners across various fields and global regions
Download or read book Molecular Diffusion on Surfaces of Carbon Materials written by Emanuel Bahn and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents my PhD work about molecular diffusion on surfaces of carbon materials. The main research has been undertaken in the form of neutron and helium spectroscopy studies and theoretical models have been developed for an interpretation of experimental data.In the first part, the growth procedure of an epitaxial graphene layer on the (111) surface of a nickel crystal is described and the adsorption and diffusion of water and of benzene on the graphene surface are discussed. Results from helium spin-echo spectroscopy studies are presented with the aspiration to obtain a detailed qualitative and quantitative description of the structure of the adsorbate and the molecular diffusion on the surface.In the following chapters, the diffusion of molecular hydrogen adsorbed in carbon aerogel, in a novel porous carbon D-96-7, and in exfoliated graphite is discussed, based on results from neutron time-of-flight spectroscopy. The aim is a detailed understanding of the connection between porosity, surface chemistry, and the molecular diffusion.
Download or read book C H N and O in Si and Characterization and Simulation of Materials and Processes written by A. Borghesi and published by Newnes. This book was released on 2012-12-02 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: Containing over 200 papers, this volume contains the proceedings of two symposia in the E-MRS series. Part I presents a state of the art review of the topic - Carbon, Hydrogen, Nitrogen and Oxygen in Silicon and in Other Elemental Semiconductors. There was strong representation from the industrial laboratories, illustrating that the topic is highly relevant for the semiconductor industry. The second part of the volume deals with a topic which is undergoing a process of convergence with two concerns that are more particularly application oriented. Firstly, the advanced instrumentation which, through the use of atomic force and tunnel microscopies, high resolution electron microscopy and other high precision analysis instruments, now allows for direct access to atomic mechanisms. Secondly, the technological development which in all areas of applications, particularly in the field of microelectronics and microsystems, requires as a result of the miniaturisation race, a precise mastery of the microscopic mechanisms.
Download or read book Physical Methods of Chemistry Investigations of Surfaces and Interfaces written by Bryant W. Rossiter and published by John Wiley & Sons. This book was released on 1993-01-12 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt: Each volume of this series heralds profound changes in both the perception and practice of chemistry. This edition presents the state of the art of all important methods of instrumental chemical analysis, measurement and control. Contributions offer introductions together with sufficient detail to give a clear understanding of basic theory and apparatus involved and an appreciation of the value, potential and limitations of the respective techniques. The emphasis of the subjects treated is on method rather than results, thus aiding the investigator in applying the techniques successfully in the laboratory.
Download or read book Hydrogen in Metals Application oriented properties written by G. Alefeld and published by . This book was released on 1978 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carbon Nanotubes and Graphene written by Kazuyoshi Tanaka and published by Newnes. This book was released on 2014-07-10 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon Nanotubes and Graphene is a timely second edition of the original Science and Technology of Carbon Nanotubes. Updated to include expanded coverage of the preparation, purification, structural characterization, and common application areas of single- and multi-walled CNT structures, this work compares, contrasts, and, where appropriate, unitizes CNT to graphene. This much expanded second edition reference supports knowledge discovery, production of impactful carbon research, encourages transition between research fields, and aids the formation of emergent applications. New chapters encompass recent developments in the theoretical treatments of electronic and vibrational structures, and magnetic, optical, and electrical solid-state properties, providing a vital base to research. Current and potential applications of both materials, including the prospect for large-scale synthesis of graphene, biological structures, and flexible electronics, are also critically discussed. Updated discussion of properties, structure, and morphology of biological and flexible electronic applications aids fundamental knowledge discovery Innovative parallel focus on nanotubes and graphene enables you to learn from the successes and failures of, respectively, mature and emergent partner research disciplines High-quality figures and tables on physical and mathematical applications expertly summarize key information – essential if you need quick, critically relevant data
Download or read book Hydrogen Spillover written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Dissociative adsorption of hydrogen on catalyst sites followed by surface diffusion (spillover) to a carbon support was first reported for Pt-carbon catalysts (Robell, 1964) and was soon accepted as a valid step of numerous catalytic reactions. However, the concept of metal-assisted hydrogen storage (Schwarz, 1988) based on spillover entered much later the hydrogen community (Lueking and Yang, 2002) and is gaining recognition slowly as an alternate approach for enhancing hydrogen storage capacity of microporous materials for fuel-cell powered vehicles. This talk will analyze the significance and limits of the spillover mechanism for adsorptive storage of hydrogen, with examples of enhanced hydrogen uptake on Pd-containing activated carbon fibers. Evidence of the atomic nature of spilt-over hydrogen will be presented based on experimental results from inelastic neutron spectroscopy studies. Research sponsored by the Division of Materials Sciences and Engineering, U.S. Department of Energy under contract with UT-Battelle, LLC.
Download or read book Fundamental processes of plasma and reactive gas surface treatment for the recovery of hydrogen isotopes from carbon co deposits in fusion devices written by Sören Möller and published by Forschungszentrum Jülich. This book was released on 2014 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental and Theoretical Studies of Diffusion on Single crystal Surfaces written by Chi Ho Mak and published by . This book was released on 1988 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Adsorption and Diffusion written by Hellmut G. Karge and published by Springer Science & Business Media. This book was released on 2008-06-17 with total page 411 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Molecular Sieves - Science and Technology" covers, in a comprehensive manner, the science and technology of zeolites and all related microporous and mesoporous materials. The contributions are grouped together topically in such a way that each volume deals with a specific sub-field. Volume 7 treats fundamentals and analyses of adsorption and diffusion in zeolites including single-file diffusion. Various methods of measuring adsorption and diffusion are described and discussed.
