Ex Situ Nmr
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Method And Apparatus For High Resolution Ex Situ Nmr Spectroscopy
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Author :
language : en
Publisher:
Release Date : 2004
Method And Apparatus For High Resolution Ex Situ Nmr Spectroscopy written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
A method and apparatus for ex-situ nuclear magnetic resonance spectroscopy for use on samples outside the physical limits of the magnets in inhomogeneous static and radio-frequency fields. Chemical shift spectra can be resolved with the method using sequences of correlated, composite z-rotation pulses in the presence of spatially matched static and radio frequency field gradients producing nutation echoes. The amplitude of the echoes is modulated by the chemical shift interaction and an inhomogeneity free FID may be recovered by stroboscopically sampling the maxima of the echoes. In an alternative embodiment, full-passage adiabatic pulses are consecutively applied. One embodiment of the apparatus generates a static magnetic field that has a variable saddle point.
Ex Situ Nmr
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Author : Vasiliki Demas
language : en
Publisher:
Release Date : 2006
Ex Situ Nmr written by Vasiliki Demas and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
Nmr And Mri Of Electrochemical Energy Storage Materials And Devices
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Author : Yong Yang
language : en
Publisher: Royal Society of Chemistry
Release Date : 2021-06-21
Nmr And Mri Of Electrochemical Energy Storage Materials And Devices written by Yong Yang and has been published by Royal Society of Chemistry this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-06-21 with Science categories.
The aim of this book is to introduce the use of NMR and MRI methods for investigating electrochemical storage materials and devices to help both NMR spectroscopists entering the field of batteries and battery specialists seeking diagnostic methods for material and device degradation.
On Ex Situ Nmr
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Author : R. Maxwell
language : en
Publisher:
Release Date : 2006
On Ex Situ Nmr written by R. Maxwell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
Nuclear magnetic resonance spectroscopy (NMR) is of unsurpassed versatility in its ability to non-destructively probe for chemical identity. Portable, low-cost NMR sensors would enable on site identification of potentially hazardous substances, such as signatures from production of nuclear, chemical, and biological weapon agents, narcotics, explosives, toxins, and poisons. There exist however problems that need to be considered in the case of such sensors: (a) small-scale magnets produce inhomogeneous magnetic fields and therefore undesired Larmor frequency distributions that conceal much of the useful spectral information, and (b) sensitivity in most experiments decreases due to the inherently low and strongly inhomogeneous fields associated with portable instruments. Our approach is to: (a) try to improve the field of low cost magnets either with hardware (e.g. magnet design and construction of ''shim coils'') or via special pulse sequences, where the field is ''effectively shimmed'' to appear homogeneous to the sample, and (b) to use microcoils to improve sensitivity and to allow focusing in smaller regions and therefore smaller static field variations. We have been working in setting up a table top, 2-Tesla permanent Halbach magnet system for tabletop NMR. The Spectrometer console is a Tecmag Apollo, controlled by a dell notebook. Currently an external linear chemagnetics rf amplifier is being used, though the power requirements for our system are quite low (a few Watts). The Magnetic Resonance lab in LLNL, has developed several types and sizes of microcoils, which have been proven to perform well for NMR experiments. We have evaluated an rf, 360 {micro}m O.D., microcoil probe that was built previously. We have finished mapping the magnetic field of the magnet. In the optimal position (in terms of field quality), the field inhomogeneity was at 17ppm. Preliminary fluorine spectra with a resolved two peak separation have now been obtained. For the field, as mapped, we have initial designs of first degree shimming, or gradient coils (linear correction to the field). We have calculated ''shim pulses'' to effectively shim the mapped field, for ideal gradient coils. These calculations will be repeated after the coils will be built and evaluated.
In Situ Nmr Methods In Catalysis
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Author : Joachim Bargon
language : en
Publisher: Springer
Release Date : 2007-04-18
In Situ Nmr Methods In Catalysis written by Joachim Bargon and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-04-18 with Science categories.
This will be a must-have work for scientists and practitioners in any field related to modern chemical research. It will also be highly useful for many workers in industry who are required to keep up-to-date with the latest news in chemistry and applied chemistry. So much is covered here in critical review, from the present position of developing research to future trends, that this book will still be an indispensable text ten years from now.
Nmr Studies Of Ruthenium And Rhodium Complexes
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Author : Sarah-Louise Henshaw
language : en
Publisher:
Release Date : 2016
Nmr Studies Of Ruthenium And Rhodium Complexes written by Sarah-Louise Henshaw and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Ex Situ And Remote Detection Nuclear Magnetic Resonance
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Author : Adam James Moulé
language : en
Publisher:
Release Date : 2003
Ex Situ And Remote Detection Nuclear Magnetic Resonance written by Adam James Moulé and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
Degradation Of Lithium Ion Battery Electrolytes
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Author : Simon Wiemers-Meyer
language : en
Publisher:
Release Date : 2017
Degradation Of Lithium Ion Battery Electrolytes written by Simon Wiemers-Meyer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Solid State Nmr In Zeolite Catalysis
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Author : Jun Xu
language : en
Publisher: Springer
Release Date : 2019-05-11
Solid State Nmr In Zeolite Catalysis written by Jun Xu and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-05-11 with Science categories.
Solid-State NMR Characterization of Heterogeneous Catalysts and Catalytic Reactions provides a comprehensive account of state-of-the-art solid-state NMR techniques and the application of these techniques in heterogeneous catalysts and related catalytic reactions. It includes an introduction to the basic theory of solid-state NMR and various frequently used techniques. Special emphasis is placed on characterizing the framework and pore structure, active site, guest-host interaction, and synthesis mechanisms of heterogeneous catalysts using multinuclear one- and two-dimensional solid-sate NMR spectroscopy. Additionally, various in-situ solid-state NMR techniques and their applications in investigation of the mechanism of industrially important catalytic reactions are also discussed. Both the fundamentals and the latest research results are covered, making the book suitable as a reference guide for both experienced researchers in and newcomers to this field. Feng Deng is a Professor at Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences.
In Situ Nmr Methodologies Development For Lithium Ion Batteries
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Author : Lina Zhou
language : en
Publisher:
Release Date : 2015
In Situ Nmr Methodologies Development For Lithium Ion Batteries written by Lina Zhou and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.