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PHYSICS (576 journals)                  1 2 3 | Last

Showing 1 - 200 of 741 Journals sorted alphabetically
Acta Acustica united with Acustica     Full-text available via subscription   (Followers: 7)
Acta Mechanica     Hybrid Journal   (Followers: 20)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
Advanced Composite Materials     Hybrid Journal   (Followers: 66)
Advanced Functional Materials     Hybrid Journal   (Followers: 50)
Advanced Materials     Hybrid Journal   (Followers: 257)
Advanced Science Focus     Free   (Followers: 3)
Advanced Structural and Chemical Imaging     Open Access   (Followers: 2)
Advanced Studies in Theoretical Physics     Open Access  
Advances in Condensed Matter Physics     Open Access   (Followers: 8)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 3)
Advances in Geophysics     Full-text available via subscription   (Followers: 6)
Advances in High Energy Physics     Open Access   (Followers: 19)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 2)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 20)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 29)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances In Physics     Hybrid Journal   (Followers: 19)
Advances in Physics : X     Open Access  
Advances in Physics Theories and Applications     Open Access   (Followers: 12)
Advances in Remote Sensing     Open Access   (Followers: 37)
AIP Advances     Open Access   (Followers: 8)
AIP Conference Proceedings     Full-text available via subscription   (Followers: 3)
American Journal of Condensed Matter Physics     Open Access   (Followers: 4)
American Journal of Signal Processing     Open Access   (Followers: 11)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 3)
Annalen der Physik     Hybrid Journal   (Followers: 5)
Annales Geophysicae (ANGEO)     Open Access   (Followers: 15)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3)
Annales UMCS, Physica     Open Access  
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 5)
Annals of Physics     Hybrid Journal   (Followers: 4)
Annals of West University of Timisoara - Physics     Open Access   (Followers: 1)
Annual Reports on NMR Spectroscopy     Full-text available via subscription   (Followers: 4)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 11)
Annual Review of Condensed Matter Physics     Full-text available via subscription  
Annual Review of Materials Research     Full-text available via subscription   (Followers: 5)
APL Materials     Open Access   (Followers: 12)
Applied Composite Materials     Hybrid Journal   (Followers: 48)
Applied Physics A     Hybrid Journal   (Followers: 7)
Applied Physics Frontier     Open Access   (Followers: 1)
Applied Physics Letters     Hybrid Journal   (Followers: 32)
Applied Physics Research     Open Access   (Followers: 3)
Applied Physics Reviews     Hybrid Journal   (Followers: 8)
Applied Radiation and Isotopes     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 23)
Applied Spectroscopy Reviews     Hybrid Journal   (Followers: 5)
Archive for Rational Mechanics and Analysis     Hybrid Journal  
Asia Pacific Physics Newsletter     Hybrid Journal  
ASTRA Proceedings     Open Access   (Followers: 1)
Astronomy & Geophysics     Hybrid Journal   (Followers: 47)
Astronomy and Astrophysics Review     Hybrid Journal   (Followers: 21)
Astrophysical Journal Supplement Series     Full-text available via subscription   (Followers: 8)
Atoms     Open Access   (Followers: 1)
Attention, Perception & Psychophysics     Full-text available via subscription   (Followers: 10)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Axioms     Open Access  
Bangladesh Journal of Medical Physics     Open Access  
Bauphysik     Hybrid Journal   (Followers: 2)
Berkala Fisika Indonesia     Open Access  
Biomaterials     Hybrid Journal   (Followers: 44)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 17)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 32)
Biophysical Reviews     Hybrid Journal   (Followers: 1)
Biophysical Reviews and Letters     Hybrid Journal   (Followers: 3)
BMC Biophysics     Open Access   (Followers: 5)
Boson Journal of Modern Physics     Open Access   (Followers: 11)
Brazilian Journal of Physics     Hybrid Journal  
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Materials Science     Open Access   (Followers: 43)
Bulletin of the Atomic Scientists     Hybrid Journal   (Followers: 3)
Bulletin of the Lebedev Physics Institute     Hybrid Journal   (Followers: 1)
Bulletin of the Russian Academy of Sciences: Physics     Hybrid Journal   (Followers: 1)
Caderno Brasileiro de Ensino de Física     Open Access  
Canadian Journal of Physics     Hybrid Journal   (Followers: 13)
Case Studies in Nondestructive Testing and Evaluation     Open Access   (Followers: 11)
Cells     Open Access   (Followers: 2)
CERN courier. International journal of high energy physics     Free   (Followers: 7)
Chemical Physics of Solid Surfaces     Full-text available via subscription  
Chinese Journal of Astronomy and Astrophysics     Full-text available via subscription   (Followers: 13)
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 1)
Chinese Journal of Physics     Hybrid Journal  
Chinese Physics B     Full-text available via subscription  
Chinese Physics C     Full-text available via subscription  
Chinese Physics Letters     Full-text available via subscription  
Cogent Physics     Open Access   (Followers: 1)
Cohesion and Structure     Full-text available via subscription   (Followers: 2)
Colloid Journal     Hybrid Journal   (Followers: 2)
Communications in Mathematical Physics     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Communications in Theoretical Physics     Full-text available via subscription   (Followers: 3)
Complex Analysis and its Synergies     Open Access   (Followers: 2)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 183)
Composites Part B : Engineering     Hybrid Journal   (Followers: 276)
Computational Astrophysics and Cosmology     Open Access   (Followers: 1)
Computational Condensed Matter     Open Access  
Computational Materials Science     Hybrid Journal   (Followers: 21)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (Followers: 3)
Computational Particle Mechanics     Hybrid Journal   (Followers: 1)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Physics Communications     Hybrid Journal   (Followers: 6)
Contemporary Concepts of Condensed Matter Science     Full-text available via subscription  
Contemporary Physics     Hybrid Journal   (Followers: 26)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 7)
Contributions to Plasma Physics     Hybrid Journal   (Followers: 3)
COSPAR Colloquia Series     Full-text available via subscription   (Followers: 7)
Cryogenics     Hybrid Journal   (Followers: 51)
Current Applied Physics     Full-text available via subscription   (Followers: 4)
Current Science     Open Access   (Followers: 60)
Diagnostic and Interventional Imaging     Full-text available via subscription  
Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Doklady Physics     Hybrid Journal   (Followers: 1)
Dynamical Properties of Solids     Full-text available via subscription  
ECS Journal of Solid State Science and Technology     Hybrid Journal   (Followers: 6)
Egyptian Journal of Remote Sensing and Space Science     Open Access   (Followers: 19)
EJNMMI Physics     Open Access  
Electrospinning     Open Access  
Embedded Systems Letters, IEEE     Hybrid Journal   (Followers: 41)
Energy Procedia     Open Access   (Followers: 2)
Engineering Failure Analysis     Hybrid Journal   (Followers: 69)
Engineering Fracture Mechanics     Hybrid Journal   (Followers: 23)
Environmental Fluid Mechanics     Hybrid Journal   (Followers: 5)
EPJ Nonlinear Biomedical Physics     Open Access  
EPJ Quantum Technology     Open Access  
EPJ Techniques and Instrumentation     Full-text available via subscription  
EPJ Web of Conferences     Open Access  
European Journal of Physics     Full-text available via subscription   (Followers: 18)
European Physical Journal - Applied Physics     Full-text available via subscription   (Followers: 17)
European Physical Journal C     Hybrid Journal   (Followers: 1)
Europhysics News     Open Access  
Experimental Mechanics     Hybrid Journal   (Followers: 22)
Experimental Methods in the Physical Sciences     Full-text available via subscription  
Experimental Techniques     Hybrid Journal   (Followers: 56)
Exploration Geophysics     Hybrid Journal   (Followers: 4)
Few-Body Systems     Hybrid Journal  
Fire and Materials     Hybrid Journal   (Followers: 5)
Flexible Services and Manufacturing Journal     Hybrid Journal   (Followers: 1)
Fluctuation and Noise Letters     Hybrid Journal   (Followers: 1)
Fluid Dynamics     Hybrid Journal   (Followers: 14)
Fortschritte der Physik/Progress of Physics     Hybrid Journal  
Frontiers in Physics     Open Access   (Followers: 6)
Frontiers of Materials Science     Hybrid Journal   (Followers: 3)
Frontiers of Physics     Hybrid Journal   (Followers: 2)
Fusion Engineering and Design     Hybrid Journal   (Followers: 10)
Geochemistry, Geophysics, Geosystems     Full-text available via subscription   (Followers: 30)
Geografiska Annaler, Series A : Physical Geography     Hybrid Journal   (Followers: 3)
Geophysical Research Letters     Full-text available via subscription   (Followers: 130)
Geoscience and Remote Sensing, IEEE Transactions on     Hybrid Journal   (Followers: 156)
Glass Physics and Chemistry     Hybrid Journal   (Followers: 4)
Global Journal of Physics     Open Access   (Followers: 2)
Granular Matter     Hybrid Journal   (Followers: 1)
Graphs and Combinatorics     Hybrid Journal   (Followers: 7)
Gravitation and Cosmology     Hybrid Journal   (Followers: 3)
Handbook of Geophysical Exploration: Seismic Exploration     Full-text available via subscription  
Handbook of Metal Physics     Full-text available via subscription  
Handbook of Surface Science     Full-text available via subscription   (Followers: 3)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription   (Followers: 1)
Haptics, IEEE Transactions on     Hybrid Journal   (Followers: 3)
Heat Transfer - Asian Research     Hybrid Journal   (Followers: 12)
High Energy Density Physics     Hybrid Journal   (Followers: 2)
High Pressure Research: An International Journal     Hybrid Journal   (Followers: 3)
IEEE Journal of Quantum Electronics     Hybrid Journal   (Followers: 21)
IEEE Signal Processing Magazine     Full-text available via subscription   (Followers: 68)
IET Optoelectronics     Hybrid Journal   (Followers: 1)
Il Colle di Galileo     Open Access  
Image Analysis & Stereology     Open Access  
Imaging Science Journal     Hybrid Journal   (Followers: 2)
Indian Journal of Biochemistry and Biophysics (IJBB)     Open Access   (Followers: 3)
Indian Journal of Physics     Hybrid Journal   (Followers: 20)
Indian Journal of Pure & Applied Physics (IJPAP)     Open Access   (Followers: 38)
Indian Journal of Radio & Space Physics (IJRSP)     Open Access   (Followers: 36)
Industrial Electronics, IEEE Transactions on     Hybrid Journal   (Followers: 41)
Industry Applications, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Infinite Dimensional Analysis, Quantum Probability and Related Topics     Hybrid Journal  
InfraMatics     Open Access  
Infrared Physics & Technology     Hybrid Journal   (Followers: 11)
Intelligent Transportation Systems Magazine, IEEE     Full-text available via subscription   (Followers: 8)
Intermetallics     Hybrid Journal   (Followers: 23)
International Applied Mechanics     Hybrid Journal   (Followers: 3)
International Geophysics     Full-text available via subscription   (Followers: 3)
International Heat Treatment and Surface Engineering     Hybrid Journal   (Followers: 5)
International Journal for Computational Methods in Engineering Science and Mechanics     Hybrid Journal   (Followers: 11)
International Journal for Ion Mobility Spectrometry     Hybrid Journal   (Followers: 1)
International Journal for Simulation and Multidisciplinary Design Optimization     Open Access   (Followers: 4)
International Journal of Abrasive Technology     Hybrid Journal   (Followers: 2)
International Journal of Aeroacoustics     Hybrid Journal   (Followers: 34)
International Journal of Applied Electronics in Physics & Robotics     Open Access   (Followers: 4)
International Journal of Astronomy and Astrophysics     Open Access   (Followers: 23)
International Journal of Computational Materials Science and Surface Engineering     Hybrid Journal   (Followers: 6)
International Journal of Damage Mechanics     Hybrid Journal   (Followers: 5)
International Journal of Fatigue     Hybrid Journal   (Followers: 37)
International Journal of Fracture     Hybrid Journal   (Followers: 12)
International Journal of Geometric Methods in Modern Physics     Hybrid Journal   (Followers: 2)
International Journal of Heat and Fluid Flow     Hybrid Journal   (Followers: 35)
International Journal of Low Radiation     Hybrid Journal  
International Journal of Low-Carbon Technologies     Open Access   (Followers: 1)
International Journal of Mass Spectrometry     Hybrid Journal   (Followers: 17)
International Journal of Material Forming     Hybrid Journal   (Followers: 1)
International Journal of Materials and Product Technology     Hybrid Journal   (Followers: 4)
International Journal of Mechanical Sciences     Hybrid Journal   (Followers: 12)

        1 2 3 | Last

Journal Cover Annual Reports on NMR Spectroscopy
  [SJR: 0.627]   [H-I: 31]   [4 followers]  Follow
   Full-text available via subscription Subscription journal
   ISSN (Print) 0066-4103
   Published by Elsevier Homepage  [3043 journals]
  • NMR Studies of Organic Aerosols
    • Authors: Regina M.B.O. Duarte; João T.V. Matos; Andreia S. Paula; Sónia P. Lopes; Guilherme Pereira; Pérola Vasconcellos; Adriana Gioda; Renato Carreira; Artur M.S. Silva; Armando C. Duarte; Patricia Smichowski; Nestor Rojas; Odon Sanchez-Ccoyllo
      Pages: 513 - 525
      Abstract: Publication date: Available online 26 May 2017
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Regina M.B.O. Duarte, Armando C. Duarte
      Organic aerosols (OAs) composition in the atmosphere is highly complex and strongly influenced by a panoply of sources and different formation processes. Although OAs have been extensively studied in urban, rural, and marine environments, their complexity is still a major obstacle to an improved understanding on how OAs affect the climate and human health. Nuclear magnetic resonance (NMR) spectroscopy has become one of the leading analytical approaches for the characterization of OAs and has gained importance in atmospheric chemistry sciences. This review highlights both solid-state and one- and two-dimensional solution-state NMR spectroscopy as unmatched tools for nontarget structural elucidation of atmospheric OAs. This work aims to demonstrate various applications of NMR in OAs studies, ranging from OAs source apportionment in field studies to investigation of secondary OAs composition in laboratory experiments. The limitations, weaknesses, and major challenges ahead on the application of NMR tools for OAs research are also overviewed.

      PubDate: 2017-05-27T21:55:30Z
      DOI: 10.1016/j.envpol.2017.05.011
      Issue No: Vol. 227 (2017)
  • Recent NMR Studies of Thermoelectric Materials
    • Authors: Ali A. Sirusi; Joseph H. Ross
      Abstract: Publication date: Available online 16 June 2017
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Ali A. Sirusi, Joseph H. Ross
      Thermoelectric materials can directly convert heat to electricity and are expected to lead to new devices to harvest waste heat for energy efficiency as well as new cooling technologies. Optimization of these properties requires tailoring vibrational properties as well as the entropy carried by electrical charges and spins. NMR measurements have been important for understanding these processes, providing a measure of anharmonic “rattling” phonon behavior, local fluctuations in charge carrier and magnetic properties, and atomic-scale symmetries and distortions within these materials. Here we report recent NMR results focusing on inorganic clathrates, skutterudites, oxides, noble metal chalcogenides, complex tellurides, and half-Heusler compounds in which high thermoelectric efficiencies have been reported.

      PubDate: 2017-08-04T10:41:15Z
      DOI: 10.1016/bs.arnmr.2017.04.002
  • Applications of Solid-State 43Ca Nuclear Magnetic Resonance:
           Superconductors, Glasses, Biomaterials, and NMR Crystallography
    • Authors: Cory M. Widdifield
      Abstract: Publication date: Available online 10 July 2017
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Cory M. Widdifield
      The application of 43Ca solid-state nuclear magnetic resonance (SSNMR) experiments to probe various materials is reviewed. Methods used to obtain high-quality 43Ca SSNMR spectra, and the types of information which can be gained by recording 43Ca NMR spectra, are outlined. Substantial discussion is provided in relation to the classes of materials which have already been studied, at least in part, by 43Ca SSNMR. This includes, but is not limited to, superconductors, binary and ternary calcium-containing inorganics (and hydrates thereof), silicates, glasses, cements, concretes, clays, phosphates, bones, teeth, calcium-containing organics, and biomaterials. Studies that include the computation of calcium NMR parameters using quantum chemistry methods are discussed in detail, which leads naturally to accounts pertaining to NMR crystallography. This review concludes with brief speculations on the future of 43Ca SSNMR.

      PubDate: 2017-07-19T08:27:27Z
      DOI: 10.1016/bs.arnmr.2017.04.006
  • Nonlinear Effects in NMR
    • Authors: Matthias Bechmann; Norbert Müller
      Abstract: Publication date: Available online 23 June 2017
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Matthias Bechmann, Norbert Müller
      Analytical applications of NMR exploit the widely assumed linearity of the NMR response with respect to the spin concentration. Deviations of this linearity are undesired and in this review some current approaches to tackle this problem are given. However, from a physics point of view, the nonlinearity is a more complex affair. Indeed, NMR as a primary representative of coherent spectroscopy can be viewed as an inherently nonlinear method, in particular with respect to the excitation amplitude. Even excluding this intrinsic property, amplitude response is not always found to be linear and several distinct fundamental nonlinearity or nonadditivity effects can be caused by spin interactions, which can either be internal to the specimen, or owed to feedback from the observation electronics as summarized here with references to the latest literature. Ways to avoid nonlinear response for quantitative NMR applications are summarized briefly.

      PubDate: 2017-06-29T10:47:28Z
      DOI: 10.1016/bs.arnmr.2017.04.005
  • Solid-State NMR Spectroscopy: The Magic Wand to View Bone at Nanoscopic
    • Authors: Kamal H. Mroue; Akhila Viswan; Neeraj Sinha; Ayyalusamy Ramamoorthy
      Abstract: Publication date: Available online 7 June 2017
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Kamal H. Mroue, Akhila Viswan, Neeraj Sinha, Ayyalusamy Ramamoorthy
      The unique potential of solid-state NMR (SSNMR) spectroscopy to provide atomistic-scale piercing insights into the structure and dynamics of complex biomaterials, such as the extracellular matrix of bone and related connective tissues, has been well demonstrated over the past several years. With its highly complex hierarchical architecture, bone indeed represents a significant challenge to structural studies using many conventional analytical and biophysical techniques. Recent instrumental and technological advances have considerably improved the sensitivity and resolution in multidimensional magic-angle spinning SSNMR experiments and have made it possible to obtain key high-resolution information, that are otherwise unobtainable by conventional microscopic and diffraction studies, from insoluble and amorphous heterogeneous materials of biological importance such as bone. In this review, we briefly present recent and continuing advances in the area of SSNMR of bone and related connective tissues like cartilage, by summarizing a selected ensemble of key SSNMR applications that highlight the potential with which this technique has contributed to our growing understanding of the complex structures and dynamics of these materials.

      PubDate: 2017-06-12T09:46:20Z
      DOI: 10.1016/bs.arnmr.2017.04.004
  • The DEPT Experiment and Some of Its Useful Variants
    • Authors: Hedvika Primasova; Peter Bigler; Julien Furrer
      Abstract: Publication date: Available online 1 June 2017
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Hedvika Primasova, Peter Bigler, Julien Furrer
      The DEPT (distortionless enhancement by polarization transfer) experiment, proposed in 1982, has revolutionized NMR spectroscopy for signal assignment, particularly for obtaining information with respect to, e.g., the type (multiplicity) and the number of Cq, CH, CH2, and CH3 in the investigated molecule and for calculating corresponding carbon type-specific subspectra (spectral editing). In this chapter, we have explored various DEPT pulse sequences and have discussed how the pulse sequence elements cooperate and contribute to the final shape and appearance of the observed signals. In addition, we have compared the results with other experiments designed for the determination of multiplicities like the spin echo (SE)-based experiments SEFT, APT, and SEMUT, and the experiments where the signal intensity is enhanced by heteronuclear polarization transfer such as the INEPT-based experiments INEPT and PENDANT, and the DEPT-based experiments DEPT, POMMIE, and DEPTQ. After a short introduction, this chapter, with the aid of product operator formalism, provides a comprehensive description of these experiments. Building from basic principles, the DEPTQ variant, for including the signals of quaternary carbons, the ACCORDEPT, for equalizing intensities in case of a wide range of heteronuclear coupling constants, and the QDEPT and QDEPT+ sequences, for obtaining quantitative DEPT data are explained in detail.

      PubDate: 2017-06-07T09:29:22Z
      DOI: 10.1016/bs.arnmr.2017.04.001
  • MRI Studies of Plastic Crystals
    • Authors: K. Romanenko
      Abstract: Publication date: Available online 9 February 2017
      Source:Annual Reports on NMR Spectroscopy
      Author(s): K. Romanenko
      Over three decades ago, plastic crystals were proposed as a solid-state alternative to conventional liquid electrolytes. Particular attention has been later drawn to organic ionic plastic crystals (OIPCs) and OIPC-based electrolytes. These ionic solids exhibit crucial characteristics of a safe electrolyte material such as nonflammability, nonvolatility, electrochemical stability, and plasticity. Versatility of ionic pairs available to date and ongoing research on molecular design will provide OIPCs for specific operating conditions within a broad range of electrochemical applications. Single-point ramped imaging with T 1 enhancement (SPRITE), an MRI method known for its capability to visualize solids, has played a key role in the discovery of several novel phenomena inherent in OIPCs. This chapter is an overview of these solid-state MRI studies. SPRITE imaging of polycrystalline morphology revealed a striking T 2 * contrast anisotropy and shed light on molecular dynamics in solid phases of plastic crystals. These observations suggest the possibility of macroscopically anisotropic ion conduction supported by impedance spectroscopy and in situ MRI experiments. MRI studies of operating electrochemical cells have led to a breakthrough in understanding the function of doped plastic crystals. The discovered hybrid solid–liquid property of OIPC electrolytes is the key for their successful commercialization.

      PubDate: 2017-02-10T08:20:40Z
      DOI: 10.1016/bs.arnmr.2016.12.002
  • Magnetic Resonance Imaging Studies of the Spatial Distribution of Charge
    • Authors: K. Borzutzki; G. Brunklaus
      Abstract: Publication date: Available online 6 February 2017
      Source:Annual Reports on NMR Spectroscopy
      Author(s): K. Borzutzki, G. Brunklaus
      Charge carriers are an essential component of electrochemical devices or participants in redox processes and govern the achievable properties or performance of the considered materials. Since well-defined structural features of active components including the explicit coordination sphere of charge carriers typically exists at rather locale scale, the application of methods that require long-range order reflecting crystalline lattices such as X-ray diffraction is limited. In this context, magnetic resonance imaging (MRI) constitutes a highly viable option as MRI (or more general NMR) is element selective, hence, charge carrier specific and able to tolerate ill-defined structural arrangements. A skillful combination of available MRI methods allows for monitoring of electrochemical processes with sufficient spatial and temporal resolution, and their recent applications in the field of batteries and other redox chemistry are concisely summarized and discussed in this review.

      PubDate: 2017-02-10T08:20:40Z
      DOI: 10.1016/bs.arnmr.2016.12.003
  • Novel Synthetic As Well As Natural Auxiliaries With a Blend of NMR
           Methodological Developments for Chiral Analysis in Isotropic Media
    • Authors: Sandeep K. Mishra; Sachin R. Chaudhari; A. Lakshmipriya; Indrani Pal; N. Lokesh; N. Suryaprakash
      Abstract: Publication date: Available online 24 January 2017
      Source:Annual Reports on NMR Spectroscopy
      Author(s): Sandeep K. Mishra, Sachin R. Chaudhari, A. Lakshmipriya, Indrani Pal, N. Lokesh, N. Suryaprakash
      Chiral auxiliaries are routinely employed in the NMR spectroscopic discrimination of enantiomers in isotropic solutions. Most of the times the presence of impurities, superposition of peaks, enormous line broadening, and complex multiplicity pattern limit the NMR spectroscopic discrimination of enantiomers and determination of their composition. There are a few approaches to unravel the overlap of peaks. A simple approach is to utilize appropriate chiral auxiliary, which induces a large chemical shift difference between the discriminated peaks (Δδ) R/S , and minimize or unravel the overlap of peaks. In this direction, several new chiral auxiliaries and new chiral differentiation protocols have been introduced, which are both synthetic and naturally occurring molecules. An alternate spectroscopic approach is to design NMR experiments to circumvent inherent problems, viz., enhancing the spectral resolution, separation of the superimposed spectra of enantiomers, and reduction of the spectral complexity. A large number of NMR experiments, such as two-dimensional selective F 1 decoupling, RES-TOCSY, multiple quantum detection, frequency-selective homodecoupling, band-selective homodecoupling, and broadband homodecoupling called as pure shift NMR, to cite a few, are available for such a purpose. Many of these techniques have simplified the chiral analysis for molecules containing diverse functional groups in the presence of suitable chiral auxiliaries. The present chapter summarizes the work carried out in the authors’ laboratory on chiral analysis. This includes the recently introduced new chiral auxiliaries, which are either synthesizable or natural products. They could be either derivatizing agents or solvating agents or the developed three-component protocols, in addition to new NMR experimental methodologies.

      PubDate: 2017-01-29T08:11:07Z
      DOI: 10.1016/bs.arnmr.2016.12.001
  • NMR Relaxation in Dendrimers
    • Authors: D.A. Markelov; M. Dolgushev; E. Lähderanta
      Abstract: Publication date: Available online 9 January 2017
      Source:Annual Reports on NMR Spectroscopy
      Author(s): D.A. Markelov, M. Dolgushev, E. Lähderanta
      This review focuses on recent advances in the theory of local orientational mobility in dendrimers that reveals in the NMR relaxation. In particular, we summarize recent results of analytic theory, computer simulations, and NMR relaxation experiments. The analytic theory provides basic means for the analysis of the simulations and experiments by predicting the existence of two dominating processes: overall branch relaxation and local vibrations. On the other hand, the results of simulations and experiments complete the picture by a third process of rotation of the dendrimer as a whole. The NMR relaxation reveals a fundamental importance of the local constraints on segments’ orientations. Remarkably, the model, in which such constraints are absent, overestimates local vibrations making the NMR relaxation rate functions for segments that have different topological location in the dendrimer to be practically indistinguishable. Inclusion of the bending rigidity fixes this flaw by endorsing the process of overall branch relaxation. This leads to a correct recognition of the slower mobility of the segments that are located closer to the dendrimer's core. The crucial role of the local constraints for the NMR relaxation functions is supported by a series of experiments and simulations.

      PubDate: 2017-01-15T07:52:15Z
      DOI: 10.1016/bs.arnmr.2016.11.001
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