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Books > Science & Mathematics > Chemistry > Physical chemistry > General

Supramolecular Assembly via Hydrogen Bonds II (Hardcover, 2004 ed.): David M. P. Mingos Supramolecular Assembly via Hydrogen Bonds II (Hardcover, 2004 ed.)
David M. P. Mingos; Contributions by D. Braga, F Grepioni, M.J. Hardie, P. Hubberstey, …
R5,244 Discovery Miles 52 440 Ships in 18 - 22 working days
Applications of Synchrotron Light to Scattering and Diffraction in Materials and Life Sciences (Hardcover, 2009 ed.): T.A.... Applications of Synchrotron Light to Scattering and Diffraction in Materials and Life Sciences (Hardcover, 2009 ed.)
T.A. Ezquerra, MariCruz Garcia-Gutierrez, Aurora Nogales, Marian Gomez
R1,458 Discovery Miles 14 580 Ships in 18 - 22 working days

In a ?rst approximation, certainly rough, one can de?ne as non-crystalline materials those which are neither single-crystals nor poly-crystals. Within this category, we canincludedisorderedsolids,softcondensed matter,andlivesystemsamong others. Contrary to crystals, non-crystalline materials have in common that their intrinsic structures cannot be exclusively described by a discrete and periodical function but by a continuous function with short range of order. Structurally these systems have in common the relevance of length scales between those de?ned by the atomic and the macroscopic scale. In a simple ?uid, for example, mobile molecules may freely exchange their positions, so that their new positions are permutations of their old ones. By contrast, in a complex ?uid large groups of molecules may be interc- nected so that the permutation freedom within the group is lost, while the p- mutation between the groups is possible. In this case, the dominant characteristic length, which may de?ne the properties of the system, is not the molecular size but that of the groups. A central aspect of some non-crystalline materials is that they may self-organize. This is of particular importance for Soft-matter materials. Self-organization is characterized by the spontaneous creation of regular structures at different length scales which may exhibit a certain hierarchy that controls the properties of the system. X-ray scattering and diffraction have been for more than a hundred years an essential technique to characterize the structure of materials. Quite often scattering anddiffractionphenomenaexhibitedbynon-crystallinematerialshavebeenreferred to as non-crystalline diffraction.

Calorimetry and Thermal Methods in Catalysis (Hardcover, 2013 ed.): Aline Auroux Calorimetry and Thermal Methods in Catalysis (Hardcover, 2013 ed.)
Aline Auroux
R5,772 R4,994 Discovery Miles 49 940 Save R778 (13%) Ships in 10 - 15 working days

The book is about calorimetry and thermal analysis methods, alone or linked to other techniques, as applied to the characterization of catalysts, supports and adsorbents, and to the study of catalytic reactions in various domains: air and wastewater treatment, clean and renewable energies, refining of hydrocarbons, green chemistry, hydrogen production and storage. The book is intended to fill the gap between the basic thermodynamic and kinetics concepts acquired by students during their academic formation, and the use of experimental techniques such as thermal analysis and calorimetry to answer practical questions. Moreover, it supplies insights into the various thermal and calorimetric methods which can be employed in studies aimed at characterizing the physico-chemical properties of solid adsorbents, supports and catalysts, and the processes related to the adsorption desorption phenomena of the reactants and/or products of catalytic reactions. The book also covers the basic concepts for physico-chemical comprehension of the relevant phenomena. Thermodynamic and kinetic aspects of the catalytic reactions can be fruitfully investigated by means of thermal analysis and calorimetric methods, in order to better understand the sequence of the elemental steps in the catalysed reaction. So the fundamental theory behind the various thermal analysis and calorimetric techniques and methods also are illustrated.

Modern Physical Chemistry - A Molecular Approach (Hardcover, and ed.): G. H. Duffey Modern Physical Chemistry - A Molecular Approach (Hardcover, and ed.)
G. H. Duffey
R6,945 Discovery Miles 69 450 Ships in 18 - 22 working days

In this new textbook on physical chemistry, fundamentals are introduced simply yet in more depth than is common. Topics are arranged in a progressive pattern, with simpler theory early and more complicated theory later. General principles are induced from key experimental results. Some mathematical background is supplied where it would be helpful. Each chapter includes worked-out examples and numerous references. Extensive problems, review, and discussion questions are included for each chapter. More detail than is common is devoted to the nature of work and heat and how they differ. Introductory Caratheodory theory and the standard integrating factor for dGrev are carefully developed. The fundamental role played by uncertainty and symmetry in quantum mechanics is emphasized. In chemical kinetics, various methods for determined rate laws are presented. The key mechanisms are detailed. Considerable statistical mechanics and reaction rate theory are then surveyed. Professor Duffey has given us a most readable, easily followed text in physical chemistry.

Magnetic Resonance in Colloid and Interface Science (Hardcover, 2002 ed.): J. Fraissard, Olga Lapina Magnetic Resonance in Colloid and Interface Science (Hardcover, 2002 ed.)
J. Fraissard, Olga Lapina
R7,768 Discovery Miles 77 680 Ships in 18 - 22 working days

Magnetic resonance techniques are especially interesting in the study of colloids and interfaces due to their unique ability to elucidate structure, dynamics and function at the atomic and molecular level. This book illustrates the most up to date applications of innovative NMR and EPR techniques, including magnetic resonance imaging and microscopy, to gas-solid and liquid-solid interfaces, organic and biological surfaces, microemulsions, liquid crystals, membranes, structure and dynamics of polymers and micellar systems, and diffusion in heterogeneous systems.

A compendium of advanced NMR and EPR techniques and a state of the art description of the power of advanced new methodologies for the study of molecular dynamics and interfaces.

Reaction Kinetics and the Development and Operation of Catalytic Processes, Volume 133 (Hardcover): G.F. Froment, K.C. Waugh Reaction Kinetics and the Development and Operation of Catalytic Processes, Volume 133 (Hardcover)
G.F. Froment, K.C. Waugh
R4,238 Discovery Miles 42 380 Ships in 10 - 15 working days

"Reaction Kinetics and the Development and Operation of Catalytic Processes" is a trendsetter. The Keynote Lectures have been authored by top scientists and cover a broad range of topics like fundamental aspects of surface chemistry, in particular dynamics and spillover, the modeling of reaction mechanisms, with special focus on the importance of transient experimentation and the application of kinetics in reactor design.
Fundamental and applied kinetic studies are well represented. More than half of these deal with transient kinetics, a new trend made possible by recent sophisticated experimental equipment and the awareness that transient experimentation provides more information and insight into the microphenomena occurring on the catalyst surface than steady state techniques. The trend is not limited to purely kinetic studies since the great majority of the papers dealing with reactors also focus on transients and even deliberate transient operation. It is to be expected that this trend will continue and amplify as the community becomes more aware of the predictive potential of fundamental kinetics when combined with detailed realistic modeling of the reactor operation.

Supramolecular Assembly via Hydrogen Bonds I (Hardcover, 2004 ed.): David Michael P. Mingos Supramolecular Assembly via Hydrogen Bonds I (Hardcover, 2004 ed.)
David Michael P. Mingos; Contributions by M. Alajarin, A. E. Aliev, A.D. Burrows, K.D.M. Harris, …
R5,242 Discovery Miles 52 420 Ships in 18 - 22 working days
Proceedings of the International Conference on Colloid and Surface Science, Volume 132 (Hardcover, 1st ed): Y. Iwasawa, N.... Proceedings of the International Conference on Colloid and Surface Science, Volume 132 (Hardcover, 1st ed)
Y. Iwasawa, N. Oyama, H. Kunieda
R4,299 Discovery Miles 42 990 Ships in 10 - 15 working days

The purpose of this Conference was to discuss the results of recent developments and the future prospect in science and technology of the field. The field has been growing and flourishing, while indicating many problems to be uncovered and solved. The conference was structured to encourage interaction and to stimulate the exchange of ideas to accomplish the above purpose.

Key issues and materials related to the Conference were included as follows:
- Molecular Assemblies in Solutions;
- Fine Particles and Colloidal Dispersions;
- Supramolecular Organized Films;
- Nanostructural Solid Surfaces;
- Industrial Applications and Products.

The Conference comprised 2 plenary lectures, 42 invited lectures, 150 oral presentations and 266 poster presentations.

Isotope Effects - in the Chemical, Geological, and Bio Sciences (Hardcover, 2009 ed.): Max Wolfsberg, W. Alexander Van Hook,... Isotope Effects - in the Chemical, Geological, and Bio Sciences (Hardcover, 2009 ed.)
Max Wolfsberg, W. Alexander Van Hook, Piotr Paneth, Luis Paulo N. Rebelo
R5,402 Discovery Miles 54 020 Ships in 18 - 22 working days

As the title suggests, Isotope Effects in the Chemical, Geological and Bio Sciences deals with differences in the properties of isotopically substituted molecules, such as differences in the chemical and physical properties of water and the heavy waters. Since the various fields in which isotope effects are applied do not only share fundamental principles but also experimental techniques, this book includes a discussion of experimental apparatus and experimental techniques.

Isotope Effects in the Chemical, Geological and Bio Sciences is an educational monograph addressed to graduate students and others undertaking isotope effect research. The fundamental principles needed to understand isotope effects are presented in appropriate detail. While it is true that these principles are more familiar to students of physical chemistry and some background in physical chemistry is recommended, the text provides enough detail to make the book an asset to students in organic and biochemistry, and geochemistry.

Handbook on the Physics and Chemistry of Rare Earths, Volume 28 (Hardcover): Karl A. Gschneidner Jr, L. Eyring Handbook on the Physics and Chemistry of Rare Earths, Volume 28 (Hardcover)
Karl A. Gschneidner Jr, L. Eyring
R5,186 Discovery Miles 51 860 Ships in 10 - 15 working days

Even at the beginning of the new millenium the rare earths still remain, to a certain extent, a mystery. The chapters in this volume will help to unravel some of these. In the filling of the 4f electronic orbitals the lanthanides defy the elementary aufbau principle that underlies the periodic sequence of the elements, and the authors of the first chapter introduce the readers to the basic physics of the orbital collapse leading to that failure. Furthermore an explanation is offered in terms of double-well potentials. The phenomenon is illustrated using the valence transitions observed in some of the rare earth atoms, including Sm group metals and the higher oxides of cerium, praseodymium and terbium. In the second chapter the synthesis and structure of the many types of rare earth halides are described. They have been described as simple, complex, binary, ternary and multinuclear complex, and other categories needed to deal with the most studied of the rare earth compounds. The structure types are skillfully illustrated to show the elementary architecture of each type.
In chapter three the authors discuss the science and applications of rare earth super ionic conductors as solid electrolytes. Conduction by oxygen and fluorine anions as well as hydrogen and other cations associated with these electrolytes is emphasized. They deal with extrinsic and intrinsic types together with their associated structures and structural types including structural defects. The chapter concludes with an outline of the many applications of solid electrolytes.
Chapter four introduces the reader to the principles that underlie thermoluminescence and its application to dosimetry and provides detailed information on the R-activated phosphors that support dosimetry. This is a selective review of detailed literature based on the areas making most progress.
The final chapter elaborates on the data gained by the studies and interpretation around the analytical separation of the individual rare earth elements utilizing chromatographic techniques. The authors describe the fundamental chemistry that underpins contemporary analytical separation techniques for lanthanide separation and analysis. This is done after a description of the rich assortment of separation methods in use has been introduced.

Progress in Ultrafast Intense Laser Science - Volume IX (Hardcover, 2013 ed.): Kaoru Yamanouchi, Katsumi Midorikawa Progress in Ultrafast Intense Laser Science - Volume IX (Hardcover, 2013 ed.)
Kaoru Yamanouchi, Katsumi Midorikawa
R3,890 R3,337 Discovery Miles 33 370 Save R553 (14%) Ships in 10 - 15 working days

The PUILS series delivers up-to-date reviews of progress in Ultrafast Intense Laser Science, a newly emerging interdisciplinary research field spanning atomic and molecular physics, molecular science, and optical science, which has been stimulated by the recent developments in ultrafast laser technologies. Each volume compiles peer-reviewed articles authored by researchers at the forefront of each their own subfields of UILS. Every chapter opens with an overview of the topics to be discussed, so that researchers unfamiliar to the subfield, as well as graduate students, can grasp the importance and attractions of the research topic at hand; these are followed by reports of cutting-edge discoveries. This ninth volume covers a broad range of topics from this interdisciplinary research field, focusing on ultrafast molecular responses to an intense laser field, advanced techniques for attosecond pulse generation, atomic and molecular responses to attosecond pulses, photoelectron spectroscopy of atoms and molecules interacting with intense light fields, and attosecond pulse interaction with solid materials.

What's the Matter? Measuring Heat and Matter Fourth Grade Nonfiction Books Science, Nature & How It Works (Hardcover):... What's the Matter? Measuring Heat and Matter Fourth Grade Nonfiction Books Science, Nature & How It Works (Hardcover)
Baby Professor
R689 R613 Discovery Miles 6 130 Save R76 (11%) Ships in 18 - 22 working days
Three-Dimensional Free-Radical Polymerization - Cross-Linked and Hyper-Branched Polymers (Hardcover, 2009 ed.): Gennady V.... Three-Dimensional Free-Radical Polymerization - Cross-Linked and Hyper-Branched Polymers (Hardcover, 2009 ed.)
Gennady V. Korolyov, Michael Mogilevich
R4,038 Discovery Miles 40 380 Ships in 18 - 22 working days

At present, three-dimensional free-radical polymerization (TFRP) is a special ?eld of radical polymerization. TFRP is characterized by speci?c kinetic regularities and mechanisms of processes for the formation of cross-linked or hyper-branched po- mers, and they are different from the kinetics and mechanism of classical radical polymerization. The fundamental studies of kinetics and mechanism of TFRP with formation of cross-linked polymers have been carried out in three stages. The ?rst stage lasted from 1960 until 1983, and the main mechanisms of TFRP of oligo(acrylates) were established during this stage [1-3]. Condensation telomerization, being a universal oligo(acrylate) synthesis procedure, allows us to vary certain molecular parameters, such as length and ?exibility of oligomeric blocks, number and type of reactive groups (methacrylic or acrylic groups), and chemical nature of atomic groups of an oligomeric block, which represent the centers of strong intermolecular interactions. For this reason, oligo(acrylates) were very convenient compounds for establi- ing the main kinetic regularities of TFRP and regularities of formation of polymer three-dimensional cross-linkedstructures,according totheso-calledmicrohetero- neous mechanism (G.V. Korolev, 1977), at the topological and morphological levels.

Multifunctional Molecular Magnets Based on Octacyanidometalates (Hardcover, 1st ed. 2017): Kenta Imoto Multifunctional Molecular Magnets Based on Octacyanidometalates (Hardcover, 1st ed. 2017)
Kenta Imoto
R2,653 Discovery Miles 26 530 Ships in 18 - 22 working days

This thesis demonstrates the novel magnetic functionalities in cyanido-bridged metal assemblies, and as such appeals to readers in the field of materials science. The utilization of octacyanidometalates as building blocks enables the observation of (i) photo-induced magnetization due to a light-induced spin-crossover in an iron octacyanidoniobate-based assembly, (ii) photo-induced magnetization with a two-step spin-crossover behavior in an iron octacyanidoniobate-based material, and (iii) the coexistence of super-ionic conductivity and metamagnetism in a manganese-octacyanoniobate system. These multi-functionalities are achieved by incorporating a spin-crossover moiety or a hydrogen-bonding network into a cyanido-bridged network structure with a strong magnetic interaction. In particular, in light-induced spin-crossover magnets, a magnetically non-ordered state can be altered to a magnetically ordered state by photo-irradiation, which is one of the attractive mechanisms for novel optical switching devices.

Ion Implantation and Synthesis of Materials (Hardcover, 2006 ed.): Michael Nastasi, James W. Mayer Ion Implantation and Synthesis of Materials (Hardcover, 2006 ed.)
Michael Nastasi, James W. Mayer
R2,677 Discovery Miles 26 770 Ships in 18 - 22 working days

Ion implantation is one of the key processing steps in silicon integrated circuit technology. Some integrated circuits require up to 17 implantation steps and circuits are seldom processed with less than 10 implantation steps. Controlled doping at controlled depths is an essential feature of implantation. Ion beam processing can also be used to improve corrosion resistance, to harden surfaces, to reduce wear and, in general, to improve materials properties. This book presents the physics and materials science of ion implantation and ion beam modification of materials. It covers ion-solid interactions used to predict ion ranges, ion straggling and lattice disorder. Also treated are shallow-junction formation and slicing silicon with hydrogen ion beams. Topics important for materials modification topics, such as ion-beam mixing, stresses, and sputtering, are also described.

CCEA AS Unit 1 Chemistry Student Guide: Basic concepts in Physical and Inorganic Chemistry (Paperback): Alyn G. Mcfarland CCEA AS Unit 1 Chemistry Student Guide: Basic concepts in Physical and Inorganic Chemistry (Paperback)
Alyn G. Mcfarland
R434 Discovery Miles 4 340 Ships in 9 - 17 working days

Reinforce students' understanding throughout their course; clear topic summaries with sample questions and answers will improve exam technique to achieve higher grades. Written by examiners and teachers, Student Guides: * Help students identify what they need to know with a concise summary of the topics examined in the AS and A-level specification * Consolidate understanding with exam tips and knowledge check questions * Provide opportunities to improve exam technique with sample graded answers to exam-style questions * Develop independent learning and research skills * Provide the content for generating individual revision notes

Transport and Fate of Chemicals in the Environment - Selected Entries from the Encyclopedia of Sustainability Science and... Transport and Fate of Chemicals in the Environment - Selected Entries from the Encyclopedia of Sustainability Science and Technology (Hardcover, 2012 ed.)
John S. Gulliver
R4,063 Discovery Miles 40 630 Ships in 18 - 22 working days

What happens when a chemical is released into the environment? It diffuses, disperses, adsorbs, reacts, and/or changes state. To predict and analyze this process, the mathematics of diffusion is applied to lakes, rivers, groundwater, the atmosphere, the oceans, and transport between these media. A sustainable world requires a deep understanding of the transport of chemicals through the environment and how to address and harness this process. This volume presents a succinct and in-depth introduction to this critical topic. Featuring authoritative, peer-reviewed articles from the Encyclopedia of Sustainability Science and Technology, Transport and Fate of Chemicals in the Environment represents an essential one-stop reference for an audience of researchers, undergraduate and graduate students, and industry professionals.

Fundamental Chemical Kinetics - An Explanatory Introduction to the Concepts (Hardcover): M.R. Wright Fundamental Chemical Kinetics - An Explanatory Introduction to the Concepts (Hardcover)
M.R. Wright
R1,159 Discovery Miles 11 590 Ships in 10 - 15 working days

The unusual approach of this text gives final honours and post-graduate students a clear and explanatory account of one of the harder areas of physical chemistry. The author takes care to provide detailed verbal clarification of the concepts and their importance together with full explanations of the mathematical developments. Her explanations are an essential and vital feature of the text, which is scholarly, lucid and well-written with a combination of depth of coverage and clarity which helps students to work through on their own.
A clear and explanatory account of one of the more difficult areas of physical chemistryProvides detailed verbal clarification of the concepts and their importance together with full explanations of the mathematical developmentsDiscusses energy transfer, molecular beam studies of reactive scattering and historical developments and modern kinetics, among other topics"

Radiation Safety Problems in the Caspian Region - Proceedings of the NATO Advanced Research Workshop on Radiation Safety... Radiation Safety Problems in the Caspian Region - Proceedings of the NATO Advanced Research Workshop on Radiation Safety Problems in the Caspian Region, Baku, Azerbaijan, 11-14 September 2003 (Hardcover, 2004 ed.)
Mohammed K Zaidi, Islam Mustafaev
R2,797 Discovery Miles 27 970 Ships in 18 - 22 working days

Senior scientists from neighboring and other NATO countries joined their efforts to help this region to get to know their problems, discussed their solutions and how they can be helped out. Distinguished experts described how they had succeeded in developing the solutions to such problem in their countries.

Principles of Coordination Polymerisation (Hardcover): W. Kuran Principles of Coordination Polymerisation (Hardcover)
W. Kuran
R11,263 Discovery Miles 112 630 Ships in 10 - 15 working days

Principles of Coordination Polymerisation, is one of the first books to offer a unified and almost complete view of coordination polymerisation. It focuses on the polymerisation of monomers, belonging to all the important classes of hydrocarbons and non-hydrocarbon monomers, in the presence of various kinds of coordination catalysts.

Taking a user-friendly approach the book examines how the catalyst is involved in each step of the monomer coordination polymerisation process and presents:

  • the basic mechanisms which occur during the coordination polymerisation process
  • coordination polymerisation of unsaturated hydrocarbon monomers, such as olefins
  • problems connected with coordination polymerisation of non-hydrocarbon monomers, such as heterocyclic and heterounsaturated monomers
  • the role of co-polymerisation in the plastics and rubber industries
  • useful problem exercises at the end of each chapter

Written by a polymer and organometallic scientist with over 30 years experience of monomer polymerisation, this book will be essential reading for graduate researchers studying polymer science and all research scientists in the plastics and rubber industries.

Endofullerenes - A New Family of Carbon Clusters (Hardcover, 2002 ed.): T. Akasaka, Sh. Nagase Endofullerenes - A New Family of Carbon Clusters (Hardcover, 2002 ed.)
T. Akasaka, Sh. Nagase
R4,177 Discovery Miles 41 770 Ships in 18 - 22 working days

To the eyes of a chemist, carbon is certainly one of the most fascinating elements of the periodic table. Basically, the electronic structure and atomic size of carbon enables this element to form a variety of bonds with other elements and, most importantly, with other carbon atoms as weIl. These unique features lead to the amazingly complicated molecular structures we encounter e. g. in life sciences and organic chemistry. Of course, the technical importance of carbon is enormou- but I don't want to carry too many coals to Newcastle. Prom the viewpoint of an astrophysicist or chemist, the significance of carbon lies in the fact that it is the most abundant condensable element in space. Born in the interior of stars, and from there expelled into the interstellar medium, it initiates the formation of simple and complex molecules and of nanoscopic grains. These in turn form huge clouds in space - the birthplace of new stars and planetary systems. The decisive role of carbon in interstellar chemistry is widely accepted and the search for more and more families of interstellar carbon-bearing molecules is a topic of ongoing research. The interdisciplinary aspect of carbon also concerns its various solid forms, in which C and the other closed-cage fullerenes are certainly some of the most popular 60 newcomers.

Mathematical Stereochemistry (Hardcover, 2nd Edition): Shinsaku Fujita Mathematical Stereochemistry (Hardcover, 2nd Edition)
Shinsaku Fujita
R4,492 Discovery Miles 44 920 Ships in 10 - 15 working days

Chirality and stereogenicity are closely related concepts and their differentiation and description is still a challenge in chemoinformatics. In his 2015 book, Fujita developed a new stereoisogram approach that provided theoretical framework for mathematical aspects of modern stereochemistry. This new edition includes a new chapter on Computer-Oriented Representations developed by the author based on Groups, Algorithms, Programming (GAP) system.

Modern Aspects of Electrochemistry 39 (Hardcover, And And): Constantinos G. Vayenas, Ralph E. White Modern Aspects of Electrochemistry 39 (Hardcover, And And)
Constantinos G. Vayenas, Ralph E. White
R2,817 Discovery Miles 28 170 Ships in 18 - 22 working days

This volume of Modern Aspects covers a wide spread of topics presented in an authoritative, informative and instructive manner by some internationally renowned specialists. Professors Politzer and Dr. Murray provide a comprehensive description of the various theoretical treatments of solute-solvent interactions, including ion-solvent interactions. Both continuum and discrete molecular models for the solvent molecules are discussed, including Monte Carlo and molecular dynamics simulations. The advantages and drawbacks of the resulting models and computational approaches are discussed and the impressive progress made in predicting the properties of molecular and ionic solutions is surveyed. The fundamental and applied electrochemistry of the silicon/electrolyte interface is presented in an authoritative review by Dr. Gregory Zhang, with emphasis in the preparation of porous silicon, a material of significant technological interest, via anodic dissolution of monocrystalline Si. The chapter shows eloquently how fundamental electrokinetic principles can be utilized to obtain the desired product morphology. Markov chains theory provides a powerful tool for modeling several important processes in electrochemistry and electrochemical engineering, including electrode kinetics, anodic deposit formation and deposit dissolution processes, electrolyzer and electrochemical reactors performance and even reliability of warning devices and repair of failed cells. The way this can be done using the elegant Markov chains theory is described in lucid manner by Professor Thomas Fahidy in a concise chapter which gives to the reader only the absolutely necessary mathematics and is rich in practical examples.

Transition Metal and Rare Earth Compounds - Excited States, Transitions, Interactions I (Hardcover, 2001 ed.): Hartmut Yersin Transition Metal and Rare Earth Compounds - Excited States, Transitions, Interactions I (Hardcover, 2001 ed.)
Hartmut Yersin; Contributions by K. L. Bray, M. Glasbeek, H. Kunkely, a. Vogler
R7,738 Discovery Miles 77 380 Ships in 18 - 22 working days

For a long time, the properties of transition metal and rare earth compounds have fascinated chemists and physicists from a scientific view-point, and more recently also their enormous potential as new materials has been explored. Applications in different fields have already been realized or are under c- rent investigation, for example, new laser materials, IR to visible upconversion systems, compounds for photolithographic processes, systems involving pho- redox processes for solar energy conversion, new photovoltaic devices, chemical sensors, biosensors, electroluminescent devices (OLEDs) for flat panel display systems, supramolecular devices with wide-range definable photophysical properties, materials for energy harvesting, optical information and storage systems, etc. Metal complexes are also highly important in biology and me- cine. Most of the applications mentioned are directly related to the properties of the electronic ground state and the lower-lying excited states. Metal complexes with organic ligands or organometallic compounds exhibit outstanding features as compared to purely organic molecules. For instance, metal compounds can often be prepared and applied in different oxidation states. Furthermore, various types of low-lying electronic excitations can be induced by a suitable choice of ligands, for example, such as metal-centered transitions (MC, e. g. d-d* tran- tion), ligand-centered (LC, e. g. n-n*), metal-to-ligand-charge transfer (MLCT, e. g. d-7r*), intra-ligand-charge-transfer (ILCT) transitions, etc. In particular, the orbitals involved in the resulting lowest excited states determine the photoph- ical and photochemical properties and thus the specific use of the compoun

Chemical Waves and Patterns (Hardcover, 1995 ed.): Raymond Kapral, K. Showalter Chemical Waves and Patterns (Hardcover, 1995 ed.)
Raymond Kapral, K. Showalter
R5,300 Discovery Miles 53 000 Ships in 18 - 22 working days

The concept of macroscopic waves and patterns developing from chemical reaction coupling with diffusion was presented, apparently for the first time, at the Main Meeting of the Deutsche Bunsengesellschaft fur Angewandte Physikalische Chemie, held in Dresden, Germany from May 21 to 24, 1906. Robert Luther, Director of the Physical Chemistry Laboratory in Leipzig, read his paper on the discovery and analysis of propagating reaction-diffusion fronts in autocatalytic chemical reactions [1, 2]. He presented an equation for the velocity of these new waves, V = a(KDC)1/2, and asserted that they might have features in common with propagating action potentials in nerve cell axons. During the discussion period, a skeptic in the audience voiced his objections to this notion. It was none other than the great physical chemist Walther Nernst, who believed that nerve impulse propagation was far too rapid to be akin to the propagating fronts. He was also not willing to accept Luther's wave velocity equation without a derivation. Luther stood his ground, saying his equation was "a simple consequence of the corresponding differential equation. " He described several different autocatalytic reactions that exhibit propagating fronts (recommending gelling the solution to prevent convection) and even presented a demonstration: the autocatalytic permanganate oxidation of oxalate was carried out in a test tube with the image of the front projected onto a screen for the audience.

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