Download or read book Surface Photochemistry microform Semiconductor Mediated Reactions written by Anthony Montague Draper and published by National Library of Canada. This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of related strained hydrocarbons; quadricyclane, tetracyclo(3.3.0.0$\sp{2,8}$.0$\sp{4,6}$) octane, pentacyclo(4.3.0.$\sp{2,4}$.0$\sp{3,8}$.0$\sp{5,7}$) nonane and pentacyclo(4.4.0.0$\sp{2,4}$.0$\sp{3,8}$.0$\sp{5,7}$) decane were examined as to their radical cation rearrangements or lack thereof on illuminated CdS, ZnO and sensitized by dicyanoanthracene. The reactivity of these compounds was investigated by molecular mechanics (MM2) and semiempirical (MNDO) calculations. The results of which suggested that the activation energy of the radical cation isomerizations varied considerably and was attributed to the differences in the structure of the radical cations.
Download or read book Surface Photochemistry written by Anthony Montague Draper and published by . This book was released on 1987 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface mediated photochemistry written by Thomas Lee Pettit and published by . This book was released on 1986 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Translational energy resolved Studies of Photogenerated Carrier induced Reactions on UHV Semiconductor Surfaces written by and published by . This book was released on 1993 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: This year we have observed and understood the central phenomena of adsorbate photochemistry of semiconductor-adsorbate interfaces. In particular, it was observed that a major channel of photochemistry on a semiconductor surface is through the transfer of photoexcited substrate electrons to the adsorbed molecules. In contrast, photochemical processes by direct intra-adsorbate excitation are largely quenched for molecules in direct contact with the surface. The electron-transfer mediated process leads to both desorption and intra-adsorbate bond cleavage. The transfer may be by hot electrons or thermalized electrons in the conduction band. Dynamics of the electron-transfer reaction vary greatly for molecules in the first and second layer and for molecules of different orientations in the first layer. While molecules in the second layer can be dissociated only through the transfer of hot electrons or direct photon bond cleavage, those in the first layer react by thermalized electrons as well as hot electrons, depending on the orientation of the molecules. The two processes are differentiated experimentally by the different characteristic energy and angular distribution of the photofragments. In addition, we have discovered that reaction self-quenching can be an important process in thermalized electron-induced reactions on semiconductor surfaces. This behavior stems from effects on lifetime of the thermalized carriers by reaction products left on the surface. Finally, importance of electron-transfer-induced reactions at surfaces arises in part from shift in lowering of unoccupied electronic orbitals of adsorbates in image region of semiconductor surfaces. This latter effect is also largely responsible for a red shift observed for photochemical processes on surfaces.
Download or read book Heterogeneous Photocatalysis Using Inorganic Semiconductor Solids written by Umar Ibrahim Gaya and published by Springer Science & Business Media. This book was released on 2013-11-08 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book underscores the essential principles of photocatalysis and provides an update on its scientific foundations, research advances, and current opinions, and interpretations. It consists of an introduction to the concepts that form the backbone of photocatalysis, from the principles of solid-state chemistry and physics to the role of reactive oxidizing species. Having recognised the organic link with chemical kinetics, part of the book describes kinetic concepts as they apply to photocatalysis. The dependence of rate on the reaction conditions and parameters is detailed, the retrospective and prospective aspects of the mechanism of photocatalysis are highlighted, and the adsorption models, photocatalytic rate expressions, and kinetic disguises are examined. This book also discusses the structure, property, and activity relationship of prototypical semiconductor photocatalysts and reviews how to extend their spectral absorption to the visible region to enable the effective use of visible solar spectrum. Lastly, it presents strategies for deriving substantially improved photoactivity from semiconductor materials to support the latest applications and potential trends.
Download or read book American Doctoral Dissertations written by and published by . This book was released on 2002 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1990 with total page 978 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Synthetic Photochemistry written by Angelo Albini and published by John Wiley & Sons. This book was released on 2010-02-01 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unique in its focus on preparative impact rather than mechanistic details, this handbook provides an overview of photochemical reactions classed according to the structural feature that is built in the photochemical step, so as to facilitate use by synthetic chemists unfamiliar with this topic. An introductory section covers practical questions on how to run a photochemical reaction, while all classes of the most important photocatalytic reactions are also included. Perfect for organic synthetic chemists in academia and industry.
Download or read book Index to American Doctoral Dissertations written by and published by . This book was released on 1989 with total page 1252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Solar Energy Update written by and published by . This book was released on 1981 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Briefs written by and published by . This book was released on 1992 with total page 1416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fossil Energy Update written by and published by . This book was released on 1983 with total page 1028 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1999 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanomaterials Chemistry written by C. N. R. Rao and published by John Wiley & Sons. This book was released on 2007-09-24 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: With this handbook, the distinguished team of editors has combined the expertise of leading nanomaterials scientists to provide the latest overview of this field. They cover the whole spectrum of nanomaterials, ranging from theory, synthesis, properties, characterization to application, including such new developments as quantum dots, nanoparticles, nanoporous materials, nanowires, nanotubes, and nanostructured polymers. The result is recommended reading for everybody working in nanoscience: Newcomers to the field can acquaint themselves with this exciting subject, while specialists will find answers to all their questions as well as helpful suggestions for further research.
Download or read book Fluorescent Nanodiamonds written by Huan-Cheng Chang and published by John Wiley & Sons. This book was released on 2018-11-12 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most comprehensive reference on fluorescent nanodiamond physical and chemical properties and contemporary applications Fluorescent nanodiamonds (FNDs) have drawn a great deal of attention over the past several years, and their applications and development potential are proving to be manifold and vast. The first and only book of its kind, Fluorescent Nanodiamonds is a comprehensive guide to the basic science and technical information needed to fully understand the fundamentals of FNDs and their potential applications across an array of domains. In demonstrating the importance of FNDs in biological applications, the authors bring together all relevant chemistry, physics, materials science and biology. Nanodiamonds are produced by powerful cataclysmic events such as explosions, volcanic eruptions and meteorite impacts. They also can be created in the lab by high-pressure high-temperature treatment of graphite or detonating an explosive in a reactor vessel. A single imperfection can give a nanodiamond a specific, isolated color center which allows it to function as a single, trapped atom. Much smaller than the thickness of a human hair, a nanodiamond can have a huge surface area that allows it to bond with a variety of other materials. Because of their non-toxicity, nanodiamonds may be useful in biomedical applications, such as drug delivery and gene therapy. The most comprehensive reference on a topic of rapidly increasing interest among academic and industrial researchers across an array of fields Includes numerous case studies and practical examples from many areas of research and industrial applications, as well as fascinating and instructive historical perspectives Each chapter addresses, in-depth, a single integral topic including the fundamental properties, synthesis, mechanisms and functionalisation of FNDs The first book published by the key patent holder with his research group in the field of FNDs Fluorescent Nanodiamonds is an important working resource for a broad range of scientists and engineers in industry and academia. It will also be a welcome reference for instructors in chemistry, physics, materials science, biology and related fields.
