Nuclear Magnetic Resonance Spectroscopy of Liquid Crystals. için kapak resmi
Nuclear Magnetic Resonance Spectroscopy of Liquid Crystals.
Başlık:
Nuclear Magnetic Resonance Spectroscopy of Liquid Crystals.
Yazar:
Dong, Ronald Y.
ISBN:
9789814273671
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 online resource (462 pages)
İçerik:
Contents -- Preface -- 1. Novel Strategies for Solving Highly Complex NMR Spectra of Solutes in Liquid Crystals E. E. Burnell, C. A. de Lange and W. Leo Meerts -- 1.1. Introduction -- 1.2. Theory -- 1.3. Multiple-quantum NMR -- 1.3.1. The MQ experiment and some variants -- 1.3.2. Spectral analysis with MQ -- 1.3.2.1. 2,6-dichloro-1-ethenylbenzene -- 1.3.2.2. Biphenyl -- 1.3.2.3. Butane -- 1.3.2.4. Some problems -- 1.4. Automated analysis using evolutionary strategies -- 1.4.1. Limiting parameter search space -- 1.4.2. The GA-method -- 1.5. Results obtained with the GA-method -- 1.6. Spectral analysis using Evolutionary Algorithms -- 1. 7. Conclusions -- Acknowledgments -- References -- 2. Analytical Potentials of Natural Abundance Deuterium NMR Spectroscopy in Achiral Thermotropics and Polypeptide Chiral Oriented Solvents P. Lesot and C. Aroulanda -- 2.1. Introduction -- 2.2. Theoretical Framework of NAD-NMR in Anisotropic Solvents -- 2.2.1. Brief description of spin Hamiltonian involved in NAD-NMR -- 2.2.2. NAD-NMR in chiral oriented solvents -- 2.2.3. 2 H relaxation and consequences on NAD-NMR spectra -- 2.3. NAD-NMR Spectroscopy of Strongly Aligned Molecules -- 2.3.1. Analysis of mesogenic molecules through NAD-NMR -- 2.3.2. Studies of solutes oriented in thermotropic liquid crystals -- 2.4. NAD-NMR in Weakly Orienting Polypeptide Solvents -- 2.4.1. Spectral discrimination of enantiomers using NAD-NMR -- 2.4.2. Design of 2D pulse sequences dedicated to NAD-NMR -- 2.4.3. Analysis of chiral rigid and flexible hydrocarbons -- 2.4.4. Applications of NAD-NMR in asymmetric synthesis -- 2.4.5. Spectral discrimination of enantiotopic elements -- 2.5. NAD-NMR in CLCs Using the Technology of Cryogenic Probes -- 2.5.1. NAD-NMR and 2H cryoprobe: new analytical frontiers -- 2.5.2. From 2D to 3D NAD-NMR experiments.

2.5.3. Anisotropic extension of the SNIF-NMR . method -- 2.5.4. Empirical assignment of the absolute configuration of enantiomers using NAD-NMR -- 2.6. Conclusion -- Acknowledgments -- References -- 3. Noble Gas Probes in NMR Studies of Liquid Crystals J. Jokisaari -- 3.1. Introduction -- 3.2. NMR Properties of Noble Gases -- 3.3. Enhancement of Polarization by Optical Pumping -- 3.4. Noble Gases in Bulk Liquid Crystals -- 3.4.1. Chemical shift -- 3.4.2. Diffusion -- 3.4.3. Relaxation -- 3.4.4. Quadrupole coupling -- 3.4.5. Simulations -- 3.5. Xenon in Confined Liquid Crystals -- 3.5. Conclusions -- Acknowledgments -- References -- 4. Bicelles - A Much Needed Magic Wand to Study Membrane Proteins by NMR Spectroscopy R. Soong, J. Xu and A. Ramamoorthy -- 4.1. Introduction -- 4.2. Bicelles: Simple, Elegant, Yet Controversial -- 4.3. Applications of Bicelles in Structural Biology -- Acknowledgement -- References -- 5. Advances in Proton NMR Relaxometry in Thermotropic Liquid Crystals P. J. Sebasti~ao, C. Cruz and A. C. Ribeiro -- 5.1. Introduction -- 5.2. Mesophases of Thermotropic Liquid Crystals -- 5.3. Proton NMR Relaxation in Liquid Crystals -- 5.3.1. Relaxation Mechanisms: Theoretical Models -- 5.3.1.1. Local molecular rotations/reorientations (R) -- 5.3.1.2. Molecular translational di usion (SD) -- 5.3.1.3. Collective motions -- 5.3.1.4. Other relaxation models for speci c motions -- 5.3.2. Experimental Techniques -- 5.4. Relaxometry Results and Molecular Dynamics -- 5.4.1. Isotropic phase -- 5.4.2. Nematic phase and Smectic phases with liquid-like layers -- 5.4.3. Smectic phases with ordered layers -- 5.4.4. Columnar phases -- 5.5. Conclusions and Outlook -- References -- 6. Deuterium NMR Study of Magnetic Field Distortions in Ferroelectric Mesogens R. Y. Dong -- 6.1. Introduction -- 6.2. Theoretical background -- 6.2.1. DNMR.

6.2.2. Free energy consideration -- 6.2.3. Helical unwinding/winding transitions in a magnetic field -- 6.3. SmC phase of 8BEF5 -- 6.4. SmC phase of BP8Cl -- 6.5. Anticlinic phases -- 6.5.1. SmC phases of 10B1M7 -- 6.6. Magnetic field effect on the transition to SmC phase -- 6.7. Conclusion -- Acknowledgment -- References -- 7. Deuteron NMR Study of the E ects of Random Quenched Disorder in 12CB Silica Dispersions D. Finotello and V. Pandya -- 7.1. Introduction -- 7.2. Experimental Details -- 7.2.1. Aerosil properties and sample preparation -- 7.2.2. Network types and relevant lengthscales -- 7.2.3. The Deuteron Nuclear Magnetic Resonance Tech- nique for Con ned Liquid Crystals -- 7.3. Experimental Results -- 7.3.1. Low Silica Density Dispersions -- 7.3.2. Higher Silica Density Dispersions -- 7.3.3. Stiff -gel dispersions -- 7.4. Conclusions -- Acknowledgments -- References -- 8. Dynamics of Liquid Crystals by means of Deuterium NMR Relaxation C. A. Veracini and V. Domenici -- 8.1. Introduction -- 8.2. Molecular Motions in Liquid Crystals -- 8.3. Dynamic Motions and NMR Techniques -- 8.3.1. Relaxation times -- 8.3.1.1. 2H NMR spin-lattice relaxation times -- 8.3.1.2. 2H NMR spin-spin relaxation times -- 8.3.2. Modeling of different motions in liquid crystals -- 8.3.2.1. Rotational diffusion in ordered phases -- 8.3.2.2. Internal motions -- 8.3.2.3. Collective motions -- 8.4. Selection of Experimental Cases -- 8.4.1. Determining the diffusion coefficients for the overall molecular and internal motions from T1 analysis -- 8.4.2. 2H NMR T1Z and T1Q analysis applied to ferroelectric (biaxial) smectic phases -- 8.4.3. 2H NMR T1Z and T1Q studies vs other experimental techniques -- 8.4.4. Applications of 2H NMR T2 relaxation to liquid crystals -- 8.5. Conclusions and Future Developments -- References.

9. Translational Self-di usion Measurements in Thermotropics by means of Static Field Gradients NMR Di usometry M. Cifelli -- 9.1. Introduction: Why Translational Diffusion in Liquid Crystals? -- 9.2. The Basic Principles of NMR Diffusometry: From the Echo Decay to the Self-Diffusion Coefficient -- 9.2.1. Spin echo versus stimulated echo -- 9.2.1.1. Echo attenuation in a Static Field Gradient (SFG) -- 9.2.2. A couple of words on the dynamic range of the measurements: which nucleus and which gradient? -- 9.3. NMR Diffusometry in Thermotropic Liquid Crystals: Measuring Diffusion in Anisotropic Systems -- 9.3.1. Further "anisotropic complications" of residual couplings -- 9.3.1.1. Fast transverse relaxation in liquid crystals -- 9.3.1.2. Dipolar correlation effect (DCE): slow modulation of residual dipolar couplings -- 9.4. A SFG Approach to Measure Translational Self-diffusion -- 9.4.1. Stray field NMR diffusometry: Exploiting the SFG present in the fringe field of the magnet -- 9.4.1.1. Pulses in the SFG and their calibrations -- 9.4.2. Pulse sequences for measuring diffusion with SFG -- 9.4.2.1. Two stimulated echo ratio -- 9.4.2.2. Constant time double stimulated echo (CTSTE) -- 9.4.2.3. Which method is preferable? -- 9.4.3. Sample rotation for full tensor diffusion measurements -- 9.4.4. Where should one place the probe to do the measurements? -- 9.5. Application of the Static Field Gradient Approach to Nematic and Smectic A phase in HAB and OAB -- 9.5.1. Translational order from diffusion data -- 9.6. Conclusions -- References -- 10. Deuterium NMR Studies of Static and Dynamic Director Alignment for Low Molar Mass Nematics A. Sugimura and G. R. Luckhurst -- 10.1. Introduction -- 10.2. Theoretical Background -- 10.3. Experimental -- 10.4. Static Director Orientation -- 10.5. Director Dynamics -- 10.6. Molecular Site Dependence of Director Dynamics.

10.7. Conclusions -- Acknowledgments -- References -- 11. Viscoelastic Properties of Liquid Crystals: Statistical-mechanical Approaches and Molecular Dynamics Simulations A. V. Zakharov -- 11.1. Introduction -- 11.2. Structure and elastic properties of nematic LCs -- 11.2.1. Elastic properties -- 11.2.2. Order parameters and direct correlation function: statistical-mechanical treatment -- 11.2.3. Order parameters and direct correlation function: molecular dynamics simulation -- 11.2.4. Flexoelectric effect -- 11.3. Viscous properties of a nematic liquid crystal -- 11.3.1. Statistical-mechanical formulas for the rotational viscosity -- 11.3.2. Motional constants and orientational time correla- tion functions -- 11.3.3. Numerical results for RVC0s and -- 11.4. Conclusion -- Acknowledgment -- References -- 12. Carbon-13 NMR Studies of Thermotropic Liquid Crystals R. Y. Dong -- 12.1. Introduction -- 12.2. Spin Hamiltonian in LC -- 12.2.1. Molecular orientational order and motion -- 12.3. 13C NMR Techniques -- 12.3.1. Spatial averaging -- 12.3.2. Spin averaging -- 12.3.3. Two-dimensional techniques -- 12.3.3.1. HETCOR -- 12.3.3.2. SLF experiment -- 12.3.3.3. MAS exchange experiment -- 12.3.3.4. SUPER experiment -- 12.4. Chemical Shifts in Uniaxial and Biaxial Phases -- 12.5. Bent-core Mesogens -- 12.5.1. Measurement of CSA tensors -- 12.5.2. 10DClPBBC and 11ClPBBC -- 12.5.3. Pbis11BB -- 12.5.4. ClPbis11BB -- 12.6. Calamitic Mesogens -- 12.6.1. Order parameters of 8BEF5 -- 12.6.2. Order parameters of 10B1M7 and 11EB1M7 -- 12.6.3. CSA tensors and molecular order in ZLL 7/* -- 12.7. Conclusion -- Acknowledgment -- References -- 13. A Combined DFT and Carbon-13 NMR Study of a Biaxial Bent-core Mesogen A. Marini, V. Prasad and R. Y. Dong -- 13.1. Introduction -- 13.2. Theory -- 13.2.1. QM Calculation of nuclear shieldings in vacuo.

13.2.2. Chemical Shielding: de nition and commonly used conventions.
Özet:
This edited volume provides an extensive overview of how nuclear magnetic resonance can be an indispensable tool to investigate molecular ordering, phase structure, and dynamics in complex anisotropic phases formed by liquid crystalline materials. The chapters, written by prominent scientists in their field of expertise, provide a state-of-the-art scene of developments in liquid crystal research. The fantastic assortment of shape anisotropy in organic molecules leads to the discoveries of interesting new soft materials made at a rapid rate which not only inject impetus to address the fundamental physical and chemical phenomena, but also the potential applications in memory, sensor and display devices. The review volume also covers topics ranging from solute studies of molecules in nematics and biologically ordered fluids to theoretical approaches in treating elastic and viscous properties of liquid crystals. This volume is aimed at graduate students, novices and experts alike, and provides an excellent reference material for readers interested in the liquid crystal research. It is, indeed, a reference book for every science library to have. Sample Chapter(s). Chapter 1: Novel Strategies for Solving Highly Complex NMR Spectra of Solutes in Liquid Crystals (1,464 KB). Contents: Novel Strategies for Solving Highly Complex NMR Spectra of Solutes in Liquid Crystals (E E Burnell et al.); Analytical Potentials of Natural Abundance Deuterium NMR Spectroscopy in Achiral Thermotropics and Polypeptide Chiral Oriented Solvents (P Lesot & C Aroulande); Noble Gas Probes in NMR Studies of Liquid Crystals (J Jokisaari); Bicelles - A Much Needed Magic Wand to Study Membrane Proteins by NMR Spectroscopy (R Soong et al.); Advances in Proton NMR Relaxometry in Thermotropic Liquid Crystals (P J Sebastião et al.); Deuterium NMR Study of Magnetic Field Distortions in

Ferroelectric Mesogens (R Y Dong); Deuteron NMR Study of the Effects of Random Quenched Disorder in 12CB Silica Dispersions (D Finotello & V Pandya); Dynamics of Liquid Crystals by Means of Deuterium NMR Relaxation (C A Veracini & V Domenici); Translational Self-Diffusion Measurements in Thermotropics by Means of Statistic Field Gradients NMR Diffusometry (M Cifelli); Deuterium NMR Studies of Static and Dynamic Director Alignment for Low Molar Mass Nematics (A Sugimura & G R Luckhurst); Viscoelastic Properties of Liquid Crystals: Statistical-Mechanical Approaches and Molecular Dynamics Simulations (A V Zakharov); Carbon-13 NMR Studies of Thermotropic Liquid Crystals (R Y Dong); A Combined DFT and Carbon-13 NMR Study of a Biaxial Bent-Core Mesogen (A Marini et al.). Readership: Chemists, physicists and material scientists. In particular, NMR spectroscopists.
Notlar:
Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, 2017. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries.
Elektronik Erişim:
Click to View
Ayırtma: Copies: