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Microchip Thermal Gradient Gas Chromatography
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Book Synopsis Microchip Thermal Gradient Gas Chromatography by : Anzi Wang
Download or read book Microchip Thermal Gradient Gas Chromatography written by Anzi Wang and published by . This book was released on 2014 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although the airbath oven is a reliable heating method for gas chromatography (GC), resistive heating is needed for higher analytical throughput and on-site chemical analysis because of size, heating rate and power requirements. In the last thirty years, a variety of resistive heating methods were developed and implemented for both benchtop and portable GC systems. Although fast heating rates and low power consumption have been achieved, losses in column efficiency and resolution, complex construction processes and difficulties experienced in recovering damaged columns have also become problematic for routine use of resistively heated columns. To solve these problems, a new resistively heated column technique, which uses metal columns and self-insulated heating wires, was developed for capillary gas chromatography. With this method, the total thermal mass was significantly less than in commercial column assemblies. Temperature-programming using resistive heating was at least 10 times faster than with a conventional oven, while only consuming 1−5% of the power that an oven would use. Cooling a column from 350 °C to 25 °C with an air fan only required 1.5 min. Losses in column efficiency and peak capacity were negligible when compared to oven heating. The major trade-off was slightly worse run-to-run retention time deviations, which were still acceptable for most GC analyses. The resistively heated column bundle is highly suitable for fast GC separations and portable GC instruments.
Book Synopsis Gas Chromatography Micro-chip with High Temperature Interface and Silk Screen Heaters by : Carlos R. Vilorio
Download or read book Gas Chromatography Micro-chip with High Temperature Interface and Silk Screen Heaters written by Carlos R. Vilorio and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: There has been substantial market demand for a portable Gas Chromatography (GC) system. Throughout the years, much progress has been made on fabricating a micro system that works as well as a benchtop system. Unfortunately, even though many substrates, channel types, channel widths, temperature control systems, and interface solutions have been attempted, existing versions of the micro-GC still fall short of the ideal. This thesis presents the design, fabrication, and testing of a silicon based micro-GC column that presents a solution for interfacing and heating of the chip. A polyimide resin is used to create a durable high temperature low thermal mass interface with the chip, while a silk screen method is demonstrated for easy printing of heaters. Chromatogram results are shown in both Temperature Program and Thermal Gradient runs.
Download or read book Gas Chromatography written by Colin Poole and published by Elsevier. This book was released on 2021-04-20 with total page 938 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas Chromatography, Second Edition, offers a single source of authoritative information on all aspects relating to the practice of gas chromatography. A focus on short, topic-focused chapters facilitates the identification of information that will be of immediate interest for familiar or emerging uses of gas chromatography. The book gives those working in both academia and industry the opportunity to learn, refresh and deepen their understanding of fundamental and instrumental aspects of gas chromatography and tools for the interpretation and management of chromatographic data. Users will find a consolidated guide to the selection of separation conditions and the use of auxiliary techniques. This new edition restores the contemporary character of the book with respect to those involved in advancing the technology, analyzing the data produced, or applying the technique to new application areas. New topics covered include hyphenated spectroscopic detectors, micromachined instrument platforms, derivatization and related microchemical techniques, petrochemical applications, volatile compounds in the atmosphere, and more. - Includes chapters written by recognized authoritative and visionary experts in the field, thus providing an overview and focused treatments on a single topic - Provides comprehensive coverage of modern gas chromatography, from theory, to methods and selected applications - Places modern developments in research literature into a general context not always apparent to inexperienced users of the techniques
Book Synopsis Temperature-Programmed Gas Chromatography by : Leonid M. Blumberg
Download or read book Temperature-Programmed Gas Chromatography written by Leonid M. Blumberg and published by John Wiley & Sons. This book was released on 2011-09-22 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive up-to-date overview of temperature-programmed gas chromatography (GC). The first part of the book introduces the reader to the basics concepts of GC, as well as the key properties of GC columns. The second part describes the mathematical and physical background of GC. In the third part, different aspects in the formation of a chromatogram are discussed, including retention times, peak spacing and peak widths. An invaluable reference for any chromatographer and analytical chemist, it provides all the answers to questions like: At what temperature does a solute elute in a temperature-programmed analysis? What is the value of the retention factor of eluting solute? How wide are the peaks? How large is the time distance between two peaks? How do all these parameters depend on the heating rate?
Book Synopsis Thermal Gradient Characterization and Control in Micro-fabricated Gas Chromatography Systems by : Austin Richard Foster
Download or read book Thermal Gradient Characterization and Control in Micro-fabricated Gas Chromatography Systems written by Austin Richard Foster and published by . This book was released on 2019 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High-speed Comprehensive Two Dimensional Gas Chromatography with Thermal Gradient Along the First Dimension Column by : Marie Thes M. Castro
Download or read book High-speed Comprehensive Two Dimensional Gas Chromatography with Thermal Gradient Along the First Dimension Column written by Marie Thes M. Castro and published by . This book was released on 1996 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Static and Dynamic Thermal Gradients in Gas Chromatography by : Samuel Avila
Download or read book Effects of Static and Dynamic Thermal Gradients in Gas Chromatography written by Samuel Avila and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas chromatography (GC) is an analytical chemistry tool used to determine the chemical composition of a gas sample by separating sample analytes as they travel through a GC column. Recent efforts have been made to understand and control gas chromatography separations with a negative thermal gradient on the column. The present work presents results from thermal gradient GC separations on two GC columns in different configurations (serpentine and radial) in a stainless-steel plate. Methods to fabricate the GC systems capable of isothermal, temperature programmed and thermal gradient separations are presented. Isothermal experimental data from the serpentine column were used to fit retention and dispersion parameters in a transport model that simulates GC separation for hydrocarbons C12-C14. Transport model simulated retention times and peak widths matched experimental values well for isothermal, temperature programmed and thermal gradient separations. The validated transport model was used to study the effect of static (not varying temporally) thermal gradients on GC separations with varying injection widths, injection band shapes and stationary phase thickness. Resolution results from different heating conditions were considered comparable if retention times for each analyte were within 5%. An optimal, static thermal gradient is shown to reduce analyte band spreading from axially-varying velocity gradients with resolution improvements over isothermal separations of up to 8% for analytes with similar retention factors. Static thermal gradients have a larger effect on fronting peak shape than tailing peak shape. Stationary phase distribution acts similar to a velocity gradient and can be corrected by a thermal gradient. Another transport model was created from isothermal experimental data on a commercial column for hydrocarbons C12-C20. An optimal, static thermal gradient does not improve resolution for all analyte pairs. An optimal, dynamic (varying tempo-rally) thermal gradient is created by uniformly increasing the temperature on an optimal, static thermal gradient. Improvements in resolution of up to 20% are achievable over temperature programmed GC separation. A dynamic thermal gradient can also correct for a poor sample injection by creating a temperature trap at the beginning of the column.
Book Synopsis Design and Application of Thermal Gradient Programming Techniques for Use in Multidimensional Gas Chromatography-mass Spectrometry (MDGC-MS) by : Jesse Alberto Contreras
Download or read book Design and Application of Thermal Gradient Programming Techniques for Use in Multidimensional Gas Chromatography-mass Spectrometry (MDGC-MS) written by Jesse Alberto Contreras and published by . This book was released on 2004 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Programmed Temperature Gas Chromatography by : Walter Edgar Harris
Download or read book Programmed Temperature Gas Chromatography written by Walter Edgar Harris and published by New York : J. Wiley. This book was released on 1966 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gas Chromatography Using Simultaneously Programmed Temperature and a Programmed Longitudinal Negative Temperature Gradient by : M. Coudert
Download or read book Gas Chromatography Using Simultaneously Programmed Temperature and a Programmed Longitudinal Negative Temperature Gradient written by M. Coudert and published by . This book was released on 1971 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recent Advances in Gas Chromatography by : Fabrice Mutelet
Download or read book Recent Advances in Gas Chromatography written by Fabrice Mutelet and published by BoD – Books on Demand. This book was released on 2022-04-13 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas chromatography is one of the most used analytical techniques in the industry. It is a powerful tool with a wide range of applications. This book presents recent advances in gas chromatography, multidimensional gas chromatography, and gas chromatography mass spectrometry. It also discusses inverse gas chromatography. The main focus is the use of gas chromatography techniques to analyze petroleum fluids, biomass, and ionic liquids in medical and petrochemical industries.
Book Synopsis High Temperature Gas Chromatography of Aromatic Hydrocarbons by : Robert A. Baxter
Download or read book High Temperature Gas Chromatography of Aromatic Hydrocarbons written by Robert A. Baxter and published by . This book was released on 1959 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fundamentals of Microfluidics and Lab on a Chip for Biological Analysis and Discovery by : Paul C.H. Li
Download or read book Fundamentals of Microfluidics and Lab on a Chip for Biological Analysis and Discovery written by Paul C.H. Li and published by CRC Press. This book was released on 2010-02-24 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lab-on-a-chip technology permits us to make many important discoveries that can only be observed at the microscale or the nanoscale. Using this technology, biological and biochemical analyses translate into greater sensitivity, more accurate results, and more valuable findings. Authored by one of the field's pioneering researchers, Fundamentals of
Book Synopsis Dynamics of Chromatography by : J. Calvin Giddings
Download or read book Dynamics of Chromatography written by J. Calvin Giddings and published by CRC Press. This book was released on 2017-12-19 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: This classic and bestselling landmark publication, originally published in 1965, examines the dynamic mechanisms, fundamental principles, and physical properties of various chromatographic procedures. It offers methods to characterize, identify, and predict chromatographic phenomena - providing strategies to select the most appropriate separation tools and techniques for specific applications in chemistry, physics, biology, and forensic and environmental science. Written by a world-renowned pioneer in the field, Dynamics of Chromatography contains many worked equations and real-world examples in gas and liquid chromatography. It includes numerous schematic figures for visualization of key concepts, introduces the means to control migration rate differences and zone spreading, and presents a detailed random-walk model for clarification of column processes. It also analyzes flow, diffusion, and kinetic events, stresses the link between theory and practice, and summarizes mathematical quantities and parameters.
Book Synopsis Split and Splitless Injection for Quantitative Gas Chromatography by : Konrad Grob
Download or read book Split and Splitless Injection for Quantitative Gas Chromatography written by Konrad Grob and published by John Wiley & Sons. This book was released on 2008-11-21 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive and unique handbook of split and splitless injection techniques has been completely revised and updated. This new edition offers: - New insights concerning sample evaporation in the injector - Information about matrix effects - A new chapter on injector design The real processes within the injector are for the first time visualized and explained by the CD-ROM included in the book. Furthermore the reader will understand the concepts of injection techniques and get a knowledge of the sources of error. The handbook also includes many practical guidelines. From reviews of former editions: "This substantial book is on injection techniques alone, which ... demonstrates this can have many pitfalls ... no one should be allowed to direct a laboratory doing quantitative analysis by GC without first being thoroughly familar with this book ..." The Analyst "This is a detailed reference volume filled with practical suggestions and techniques for managing split and splitless injection in the day-to-day world of the working gas chromatographer. It will be useful ... for anyone who must work hands-on with GC." Journal of High Resolution Chromatography
Book Synopsis Encyclopedia of Microfluidics and Nanofluidics by : Dongqing Li
Download or read book Encyclopedia of Microfluidics and Nanofluidics written by Dongqing Li and published by Springer Science & Business Media. This book was released on 2008-08-06 with total page 2242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering all aspects of transport phenomena on the nano- and micro-scale, this encyclopedia features over 750 entries in three alphabetically-arranged volumes including the most up-to-date research, insights, and applied techniques across all areas. Coverage includes electrical double-layers, optofluidics, DNC lab-on-a-chip, nanosensors, and more.
Download or read book Chromatography written by Elsa Lundanes and published by John Wiley & Sons. This book was released on 2013-12-04 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Finally a book on chromatography which is easy to grasp for undergraduates and technicians; covers the area in sufficient depth while still being concise. The book includes all recent technology advances and has core textbook features further improving the learning experience. This book is the perfect introduction into a methodology which is the underlying principle of the vast majority of separation methods worldwide. Everyone working in a lab environment must be familiar with the basis of these technologies and Tyge Greibrokk, Elsa Lundanes and Leon Reubsaet succeed in delivering a text which is easy to read for undergraduates and laboratory technicians, and covers the area in sufficient depth while still being concise. The book includes all recent technology advances and has core textbook features further improving the learning experience. Importantly, the text does not only cover all major modern chromatography technology (thin layer, gas, high pressure liquid, and supercritical fluid chromatography) but also related methods, in particular electrophoretic technologies.
