13C NMR Spin-Lattice Relaxation Properties and Quantitative Analytical Methodology of 13C NMR Spectroscopy for Coals

1995 ◽  
Vol 67 (13) ◽  
pp. 2188-2194 ◽  
Author(s):  
Antoni. Jurkiewicz ◽  
Gary E. Maciel
Keyword(s):  
Nmr Spectroscopy ◽  
13C Nmr ◽  
Lattice Relaxation ◽  
13C Nmr Spectroscopy ◽  
Spin Lattice Relaxation ◽  
Analytical Methodology ◽  
Relaxation Properties ◽  
Spin Lattice

A Novel Method for 13C-NMR Spectroscopy of Polymer in Emulsion: Quantitative Analysis of Microstructure of Crosslinked Polybutadiene in Latex

1999 ◽  
Vol 72 (5) ◽  
pp. 844-853 ◽  
Author(s):  
Seiichi Kawahara ◽  
Saori Bushimata ◽  
Takashi Sugiyama ◽  
Chihiro Hashimoto ◽  
Yasuyuki Tanaka
Keyword(s):  
Nmr Spectroscopy ◽  
High Resolution ◽  
13C Nmr ◽  
Lattice Relaxation ◽  
13C Nmr Spectroscopy ◽  
Lattice Relaxation Time ◽  
Solid Sample ◽  
Spin Lattice Relaxation ◽  
High Resolution Spectrum ◽  
C Nmr

Abstract A novel analytical method using high resolution 13C-NMR spectroscopy to study polymer latex, which is a heterogeneous system comprising polymer dispersoid and water, is described. The appropriate concentrations of surfactant and dried rubber content of a polybutadiene latex, which give the best spectrum, were found to be 1 w/v % and 10%, respectively. The half-widths of resonance peaks for the latex sample were almost identical to the half-widths obtained in solution, which were about one-third the width of those obtained using a solid sample of either a crosslinked or soluble polybutadiene. Nevertheless, the signal to noise ratio for the latex sample was slightly smaller than that for the solution sample. The values of spin-lattice relaxation time, T1, for the latex sample were similar to those for the solid sample. These demonstrate that the latex state C-NMR spectroscopy will be a powerful technique for structural characterization of crosslinked gels in the dispersoid because it gives a high resolution spectrum comparable to solution state spectroscopy, showing short T1 values corresponding to those for solid state C-NMR spectroscopy. High resolution latex state 13C-NMR spectroscopy was used to determine the concentrations of the various isomers of the polybutadiene in the dispersoid.

scholarly journals A quantum mechanical alternative to the Arrhenius equation in the interpretation of proton spin–lattice relaxation data for the methyl groups in solids

2015 ◽  
Vol 17 (43) ◽  
pp. 28866-28878 ◽  
Author(s):  
Piotr Bernatowicz ◽  
Aleksander Shkurenko ◽  
Agnieszka Osior ◽  
Bohdan Kamieński ◽  
Sławomir Szymański
Keyword(s):  
Nmr Spectroscopy ◽  
Arrhenius Equation ◽  
Lattice Relaxation ◽  
Proton Spin ◽  
Spin Lattice Relaxation ◽  
Quantum Mechanical ◽  
Methyl Groups ◽  
Relaxation Data ◽  
Spin Lattice ◽  
Nuclear Spin Lattice Relaxation

The issue of nuclear spin–lattice relaxation in methyl groups in solids has been a recurring problem in NMR spectroscopy.

scholarly journals Effect of H bond removal and changes in the position of the iron–sulphur head domain on the spin–lattice relaxation properties of the [2Fe–2S]2+Rieske cluster in cytochrome bc1

2015 ◽  
Vol 17 (38) ◽  
pp. 25297-25308 ◽  
Author(s):  
Marcin Sarewicz ◽  
Małgorzata Dutka ◽  
Rafał Pietras ◽  
Arkadiusz Borek ◽  
Artur Osyczka
Keyword(s):  
Membrane Protein ◽  
Electron Spin ◽  
Protein Complex ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Membrane Protein Complex ◽  
Relaxation Properties ◽  
Spin Lattice ◽  
Relaxation Studies ◽  
Comparative Electron

Here, comparative electron spin–lattice relaxation studies of the 2Fe–2S iron–sulphur (Fe–S) cluster embedded in a large membrane protein complex – cytochromebc1– are reported.

13C NMR Spin−Lattice Relaxation and Conformational Dynamics in a 1,4-Polybutadiene Melt

2001 ◽  
Vol 34 (15) ◽  
pp. 5192-5199 ◽  
Author(s):  
Grant D. Smith ◽  
Oleg Borodin ◽  
Dmitry Bedrov ◽  
Wolfgang Paul ◽  
XiaoHua Qiu ◽  
...  
Keyword(s):  
13C Nmr ◽  
Conformational Dynamics ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Polybutadiene Melt

Ionic mobility in Nasicon-type LiMIV2(PO4)3 materials followed by 7Li NMR spectroscopy.

2011 ◽  
Vol 1313 ◽  
Author(s):  
K. Arbi ◽  
I. Sobrados ◽  
M. Hoelzel ◽  
A. Kuhn ◽  
F. Garcia-Alvarado ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Impedance Spectroscopy ◽  
Nmr Relaxation ◽  
Lattice Relaxation ◽  
Ionic Mobility ◽  
Spin Lattice Relaxation ◽  
Pulse Field ◽  
Relaxation Rates ◽  
Arrhenius Behavior ◽  
Spin Lattice

AbstractLithium mobility in LiM2(PO4)3 compounds, with M= Ge, Ti, Sn, Zr and Hf, has been investigated by 7Li Nuclear Magnetic Resonance (NMR) spectroscopy in the temperature range 100-500 K. From the analysis of 7Li NMR quadrupole interactions (CQ and η parameters), Li sites occupancy and exchange processes between structural sites have been studied. Below 250K, Li ions are preferentially located at M1 sites in rhombohedral phases, but occupy M12 sites in triclinic ones. At increasing temperatures, Li mobility has been deduced from spin-spin () and spin-lattice relaxation () rates. In this analysis, the presence of two relaxation mechanisms in plots has been associated with departures of conductivity from the Arrhenius behavior. At high temperatures, residence times at M12−T11−T11−T1 and M12 sites become similar and conductivity significantly increase. This superionic state can be achieved by enlarged order-disorder transformations in rhombohedral phases, or by sharp first order transitions in triclinic ones. Results described in the LiTi2(PO4)3 sample have been compared with those obtained in rhombohedral Li1+xTi2-xAlx(PO4)3 and LiTi2-xZrx(PO4)3 series showing respectively higher and lower conductivities. In the case of Li1.2Ti1.8Al0.2(PO4)3, displaying the highest reported conductivity, NMR results are discussed in relation with those obtained by Neutron Diffraction (ND) and Impedance Spectroscopy (IS). Diffusion coefficients determined by NMR Pulse Field Gradient (PFG) technique are similar to those deduced from Impedance Spectroscopy and NMR relaxation data.

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