Device Architecture and Materials for Organic Light-Emitting Devices focuses on the design of new device and material concepts for organic light-emitting devices, thereby targeting high current densities and an improved control of the triplet concentration. A new light-emitting device architecture, the OLED with field-effect electron transport, is demonstrated. This device is a hybrid between a diode and a field-effect transistor. Compared to conventional OLEDs, the metallic cathode is displaced by one to several micrometers from the light-emitting zone, reducing optical absorption losses. The electrons injected by the cathode accumulate at an organic heterojunction and are transported to the light-emission zone by field-effect. High mobilities for charge carriers are achieved in this way, enabling a high current density and a reduced number of charge carriers in the device. Pulsed excitation experiments show that pulses down to 1 us can be applied to this structure without affecting the light intensity, suggesting that pulsed excitation might be useful to reduce the accumulation of triplets in the device. The combination of all these properties makes the OLED with field-effect electron transport particularly interesting for waveguide devices and future electrically pumped lasers. In addition, triplet-emitter doped organic materials, as well as the use of triplet scavengers in conjugated polymers are investigated.

Clear, Practical Coverage of an Important Reemerging Technology Supercritical Fluid Extraction provides a clear, practical, step-by-step introduction to a sample preparation method that helps laboratories reduce or eliminate the use of halogenated solvents, extract samples more quickly and efficiently, and improve the accuracy of their results. By encouraging a deliberate, systematic approach to supercritical fluid extraction (SFE) methods and techniques, this book enables scientists and technicians to avoid disappointing results and erroneous conclusions and develop reliable guidelines for using this versatile technology. It demonstrates how to make the most of a process that is highly reproducible, fast, and quantitative at sub-ppb levels; preserves the chemical integrity of the analyte to be extracted; and yields a concentrated sample solution that can be easily manipulated. Topics covered include:

• Properties of supercritical fluids
• Functional group solubility in supercritical fluids
• Collection efficiency in off-line SFE
• Extraction strategies
• Applications of analytical SFE

Basic Multidimensional Gas Chromatography is aimed at the next generation of multidimensional gas chromatography users who will require basic training in the fundamentals of both GC and GCxGC. This book fills the current need for an inexpensive, straightforward guidebook to get new users started. It will help new users determine when to add or purchase a multidimensional system and teach them to optimize and maximize the capability of each system. Readers will also learn to select specific modes for each portion of a multidimensional analysis. This ideal resource is a concise, hard-hitting text that provides the facts needed to get users up and running.

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The first edition of "Chromatography: Concepts and Contrasts," published in 1988, was one of the first books to discuss all the different types of chromatography under one cover. The second edition continues with these principles but has been updated to include new chapters on sampling and sample preparation, capillary electrophoresis and capillary electrochromatography (CEC), chromatography with mass spec detection, and industrial and governmental practices in regulated industries.

• Covers extraction, solid phase extraction (SPE), and solid phase microextraction (SPME), and introduces mass spectrometry
• Updated with the latest techniques in chromatography
• Discusses both liquid chromatography (LC)and gas chromatography(GC)

This monograph contains a survey on the role of chirality in ecotoxicological processes. The focus is on environmental trace analysis. Areas such as toxicology, ecotoxicology, synthetic chemistry, biology, and physics are also covered in detail in order to explain the different properties of enantiomers in environmental samples. This monograph delivers a comprehensive survey for environmental trace analysts, analytical chemists, ecotoxicologists, food scientists and experienced lab workers.

Research and development in the field of hyphenated techniques has been growing rapidly in the last few years, as indicated by the growing number of conferences on the subject and also the huge number of papers published on techniques such as LC-GC (Liquid Chromatography-Gas Chromatography). Multidimensional techniques - the combination of 2 separation techniques - is an important subsection of hyphenation technologies and up to now there has been no book covering all multidimensional techniques.

This monograph, edited by pioneers in the field, is the first book to review all multidimensional techniques including LC-GC, GC-GC and GC-Supercritical Fluid Chromatography. Part 1 describes the numerous combinations of techniques with much practical advice for the beginner as well as for experienced practitioners, while Part 2 details the many and varied applications in areas as diverse as polymer separations and environmental analysis.

Multidimensional Chromatography will be an invaluable resource for technicians, engineers and research scientists across a wide range of disciplines, both in industrial and academic laboratories. It is also a suitable text for graduate courses. The nature of the material means it can find a place in any analytical laboratory and scientific library.

This book reviews the development, characterization and applications of aptamers in different areas of biotechnology ranging from therapeutics to diagnostics and protein purification. Hailed as chemical antibodies, these single-stranded nucleic acid receptors were predicted to supersede antibodies in traditional assays, such as ELISA, within a short time. While this has yet to happen, readers will find in this book a deep insight into the progress of aptamer technology and a critical discussion about the limitations that need to be overcome in order to find wider acceptance and use outside of the still relatively small aptamer-community. This book covers all aspects of aptamer generation and application for the aptamer-experienced reader and curious novice alike, with the addition of an industry perspective on the future of aptamer-use in biotechnology.

This handbook is one of three containing an invaluable collection of research grade XPS spectra. Each handbook concentrates on a specific family of materials (the elements and their native oxides, semiconductors, and polymers) and is entirely self-contained. The introductory section to each handbook includes comprehensive information about the XPS instruments used, the materials, and the advanced methods of collecting the spectra. Energy resolution settings, instrument characteristics, energy referencing methods, traceability, energy scale calibration details and transmission function are all reported. Among the many valuable features included in each of these handbooks are:
* All spectra were measured by using Al_K monochromatic X-rays.
* All spectra were collected in a self-consistent manner to maximize data reliability and quality.
* All peaks in the wide spectra are fully annotated and accompanied by detailed atom % tables that report BEs for each of the labelled peaks.
* Each high-energy resolution spectrum is peak-fitted and accompanied by detailed tables containing binding energies, FWHMs and relative percentages.
In this volume, The Elements and Native Oxides, are contained XPS spectra of the elements and real-world practical grade spectra of their native oxides. Exclusive features of this volume include:
* Binding energies for pure elements that are accurate to +/- 0.06 eV
* Alphabetical organization based on commonplace chemical abbreviations
* Charge compensation with patented flood-gun-mesh-screen system
* C (1s) binding energies for adventitious hydrocarbons revealing that the BE ranges from 284.2 to 286.3 eV
* Valence band spectrafrom the elements.
This handbook is an invaluable reference for scientists in industry, academia and government laboratories that use XPS spectra in materials science and surface science. Also available: Handbook of Monochromatic XPS Spectra: Polymers and Polymers Damaged by X-rays Handbook of Monochromatic XPS Spectra: Semiconductors

Nanomaterials in Chromatography: Current Trends in Chromatographic Research Technology and Techniques provides recent advancements in the wide variety of chromatographic techniques applied to nanotechnology. As nanomaterials' unique properties can improve detection sensitivity and miniaturize the devices used in analytical procedures, they can substantially affect the evaluation and analysis ability of scientists and researchers and foster exciting developments in separation science. The book includes chapters on such crucial topics as the use of nanomaterials in sample preparation and the legalization of nanomaterials, along with a section on reducing the cost of the analysis process, both in terms of chemicals and time consumption.

Covers application of Deep Eutectic Solvents (DES) in extraction of aromatics and polyaromatics from fuel oil by Liquid-Liquid extraction Studies eutectic behavior with respect to hydrocarbon and aqueous solutions Describes molecular dynamics insights of extraction by DES Explores possible industrial applicability of potential DES Includes results from Gaussian, NAMD and PACKMOL software packages

This book provides an in-depth understanding of molecular recognition mechanisms in designing chromatographical processes for separations. The title explains the importance of chemistry in chromatography and molecule-molecule interaction mechanisms and extends the concepts of separation to isomers and chiral isomers.
"Chromatographic Separations Based on Molecular Recognition" discusses the theoretical interpretations of chromatographic retention processes, explains the molecular recognition concept for the separation of various isomers, and provides a foundation in separation science which will lead to a better grasp of other chemical fields and simplify the design and synthesis of novel stationary phases.

Demonstrates the conditions under which a 2D-LC method should be considered as an alternative to a 1D-LC method. Establishes a sound fundamental basis of the principles of the technique, followed by guidelines for method optimization. Provides a single source for technical knowledge advances and practical guidance described in recent literature. Assists with the initial decision to develop a 2D-LC method. Guides the reader in developing a high-quality method that meets the needs of their application.

Updated and expanded, the classic guide to GC/MS helps chromatographers quickly learn to use this technique for analyzing and identifying compounds. After explaining the fundamentals, it discusses optimizing, tuning, using, and maintaining GC/MS equipment; explores advances in miniaturized and field-portable GC/MS systems and microfluidic components; and more. Complete with a CD-ROM, it covers applications in the environmental laboratory and in forensics, toxicology, and space science. This is the premier resource for professionals in those fields and for students.

The isolation and structural characterization of substances present at very low concentrations, as is necessary to satisfy regulatory requirements for pharmaceutical drug degradants and impurities, can present scientific challenges. The coupling of HPLC with NMR spectroscopy has been at the forefront of cutting-edge technologies to address these issues. LC-NMR: Expanding the Limits of Structure Elucidation presents a comprehensive overview of key concepts in HPLC and NMR that are required to achieve definitive structure elucidation with very low levels of analytes. Because skill sets from both of these highly established disciplines are involved in LC-NMR, the author provides introductory background to facilitate readers' proficiency in both areas, including an entire chapter on NMR theory. The much-anticipated second edition provides guidance in setting up LC-NMR systems, discussion of LC methods that are compatible with NMR, and an update on recent hardware and software advances for system performance, such as improvements in magnet design, probe technology, and solvent suppression techniques that enable unprecedented mass sensitivity in NMR. This edition features methods to quantify concentration and assess purity of isolated metabolites on the micro scale and incorporates computational approaches to accelerate the structure elucidation process. The author also includes implementation and application of qNMR and automated and practical use of computational chemistry combined with QM and DFT to predict highly accurate NMR chemical shifts. The text focuses on current developments in chromatographic-NMR integration, with particular emphasis on utility in the pharmaceutical industry. Applications include trace analysis, analysis of mixtures, and structural characterization of degradation products, impurities, metabolites, peptides, and more. The text discusses novel uses and emerging technologies that challenge detection limits as well future directions for this important technique. This book is a practical primary resource for NMR structure determination-including theory and application-that guides the reader through the steps required for isolation and NMR structure elucidation on the micro scale.

For six decades, scientists and researchers have relied on the Advances in Chromatography series for the most up-to date information on a wide range of developments in chromatographic methods and applications. The clear presentation of topics and vivid illustrations for which this series has become known makes the material accessible and engaging to analytical, biochemical, organic, polymer, and pharmaceutical chemists at all levels of technical skill. Key Features: Discusses the basic concepts of affinity chromatography and examines recent developments in this method and related supramolecular separation methods. Outlines the different types of gradient stationary phases and how they have been used in and benefited the field of separation science. Reviews recent trends in detectors for GC, focusing on those that are readily available and seeing wide usage. Addresses peak compression in GELC and offers the reader a plate height equation to work with that incorporates its effects.

Advanced Separations by Specialized Sorbents opens a new window into sorbent materials, presenting fundamental principles for their syntheses and adsorption properties. The book presents advanced techniques used to create specialized sorbents with a wide range of functions that can be used to enhance the separation and/or purification of useful bioactive compounds, heavy metals, dyes, and other substances. It discusses the most recent developments in the field of separation processes, covering specialized sorbents such as monolith cryogels, composite hydrogels, metal-impregnated ion exchangers, and molecularly imprinted polymers. The book provides a comprehensive discussion of the selectivity in separation processes by composite materials based on synthetic polymers/biopolymers and inorganic particles. It is a comprehensive resource for academic and research scientists as well as students interested in the preparation, characterization, and application of specialized sorbents.

Thermoelectric devices could play an important role in making efficient use of our energy resources but their efficiency would need to be increased for their wide scale application. There is a multidisciplinary search for materials with an enhanced thermoelectric responses for use in such devices. This volume covers the latest ideas and developments in this research field, covering topics ranging from the fabrication and characterization of new materials, particularly those with strong electron correlation, use of nanostructured, layered materials and composites, through to theoretical work to gain a deeper understanding of thermoelectric behavior. It should be a useful guide and stimulus to all working in this very topical field.

This book presents recent research and advances in various solid-liquid separation technologies and some applications for treating produced water. It covers fundamental principles and the importance of produced water in major industrial sectors and compares solid-liquid separation technologies. In addition, this book Presents the results of research studies conducted to evaluate the performance of solid-liquid separation technologies Discusses a wide range of technologies, including membrane, filtration, crystallization, desalination, supercritical fluids, coagulation, and floatation Includes experimental, theoretical, modeling, and process design studies With its comprehensive coverage, this book is an essential reference for chemical researchers, scientists, and engineers in industry, academia, and professional laboratories. It is also an important resource for graduate and advanced undergraduate students studying solid-liquid separations.

To anyone who is interested in surface chemical analysis of materials on the nanometer scale, this book is prepared to give appropriate information. Based on typical application examples in materials science, a concise approach to all aspects of quantitative analysis of surfaces and thin films with AES and XPS is provided. Starting from basic principles which are step by step developed into practically useful equations, extensive guidance is given to graduate students as well as to experienced researchers. Key chapters are those on quantitative surface analysis and on quantitative depth profiling, including recent developments in topics such as surface excitation parameter and backscattering correction factor. Basic relations are derived for emission and excitation angle dependencies in the analysis of bulk material and of fractional nano-layer structures, and for both smooth and rough surfaces. It is shown how to optimize the analytical strategy, signal-to-noise ratio, certainty and detection limit. Worked examples for quantification of alloys and of layer structures in practical cases (e.g. contamination, evaporation, segregation and oxidation) are used to critically review different approaches to quantification with respect to average matrix correction factors and matrix relative sensitivity factors. State-of-the-art issues in quantitative, destructive and non-destructive depth profiling are discussed with emphasis on sputter depth profiling and on angle resolved XPS and AES. Taking into account preferential sputtering and electron backscattering corrections, an introduction to the mixing-roughness-information depth (MRI) model and its extensions is presented.

This book highlights the potential and scope of green chemistry for clean and sustainable development. Covering the basics, the book introduces readers to the need and the many applications and benefits and advantages of environmentally friendly chemical practice and application in industry. The book addresses such topics as ecologically safe products, catalysts and solvents, conditions needed to produce such products, types of chemical processes that are conducive to green chemistry, and much more.

Provides a systematic review of microextraction techniques applied in analytical toxicology. A comprehensive guide for practical implementation of microextraction techniques in forensic, clinical and analytical laboratories. Contains figures and tables for easy understanding and quick adaptation of parameters of microextraction techniques. Fundamentals, development, and applications of microextraction techniques as a sample preparation procedure are discussed in detail. Extremely useful for the researchers and academicians engaged in the analytical method development using microextraction techniques.

Due to its high sensitivity and selectivity, liquid chromatography-mass spectrometry (LC-MS) is a powerful technique. It is used for various applications, often involving the detection and identification of chemicals in a complex mixture. Ultra Performance Liquid Chromatography Mass Spectrometry: Evaluation and Applications in Food Analysis presents a unique collection of up-to-date UPLC-MS/MS methods for the separation and quantitative determination of components, contaminants, vitamins, and aroma and flavor compounds in a wide variety of foods and food products. The book begins with an overview of the history, principles, and advancement of chromatography. It discusses the use of UHPLC techniques in food metablomics, approaches for analysis of foodborne carcinogens, and details of UPLC-MS techniques used for the separation and determination of capsaicinoids. Chapters describe the analysis of contaminants in food, including pesticides, aflatoxin, perfluorochemicals, and acrylamide, as well as potentially carcinogenic heterocyclic amines in cooked foods. The book covers food analysis for beneficial compounds, such as the determination of folate, vitamin content analysis, applications for avocado metabolite studies, virgin olive oil component analysis, lactose determination in milk, and analysis of minor components of cocoa and phenolic compounds in fruits and vegetables. With contributions by experts in interdisciplinary fields, this reference offers practical information for readers in research and development, production, and routing analysis of foods and food products.

Within the last 30 years, electron energy-loss spectroscopy (EELS) has become a standard analytical technique used in the transmission electron microscope to extract chemical and structural information down to the atomic level. In two previous editions, "Electron Energy-Loss Spectroscopy in the Electron Microscope" has become the standard reference guide to the instrumentation, physics and procedures involved, and the kind of results obtainable. Within the last few years, the commercial availability of lens-aberration correctors and electron-beam monochromators has further increased the spatial and energy resolution of EELS. This thoroughly updated and revised Third Edition incorporates these new developments, as well as advances in electron-scattering theory, spectral and image processing, and recent applications in fields such as nanotechnology. The appendices now contain a listing of inelastic mean free paths and a description of more than 20 MATLAB programs for calculating EELS data.

With contributions from experts from both the industry and academia, this book presents the latest developments in the identified areas. In addition, a thorough and updated coverage of the traditional aspects of heterogeneous catalysis such as preparation, characterization and use in well-established technologies such as nitration, ammoxidation and hydrofluorination is included. This book incorporates appropriate case studies, explanatory notes, and schematics for more clarity and better understanding.