REMOVAL OF OXYGEN FROM METHANE AND THE USE OF NUCLEAR SPIN RELAXATION TO MEASURE OXYGEN CONCENTRATION

1960 ◽  
Vol 38 (4) ◽  
pp. 493-495 ◽  
Author(s):  
H. S. Sandhu ◽  
J. Lees ◽  
M. Bloom
Keyword(s):  
Oxygen Concentration ◽  
Spin Relaxation ◽  
Nuclear Spin ◽  
Nuclear Spin Relaxation ◽  
Upper Limit ◽  
Misch Metal ◽  
Relaxation Measurements

Nuclear spin relaxation measurements are used to measure quantitatively the amount of oxygen present in methane. An upper limit of 2.5 × 10−4% is placed on the amount of oxygen present in methane after treatment with a getter made of misch metal.

scholarly journals Functional Group Resolved Nuclear Spin Relaxation in Porous Media

2021 ◽  
Author(s):  
Neil Robinson ◽  
Eric May ◽  
Michael Johns
Keyword(s):  
Spin Relaxation ◽  
Nuclear Spin ◽  
Functional Group ◽  
Proton Exchange ◽  
Nuclear Spin Relaxation ◽  
Separation Processes ◽  
Diverse Range ◽  
Non Invasive ◽  
Relaxation Measurements ◽  
Low Magnetic Field

Understanding solid-fluid interactions within porous materials is critical for their efficient utilisation across chemical reaction and separation processes. However, detailed characterisation of interfacial phenomena within such systems is hampered by their optically opaque nature. Motivated by the need to bridge this capability gap, we detail here the application of low magnetic field 2D <sup>1</sup>H nuclear spin relaxation measurements as a non-invasive probe of sorbate/sorbent interactions, exploring the relaxation characteristics exhibited by liquid adsorbates confined to a model mesoporous silica. For the first time, we demonstrate the capacity of such measurements to distinguish functional group-specific relaxation phenomena across a diverse range of protic adsorbates of wide importance as solvents, reagents, and hydrogen carriers, with distinct relaxation environments assigned to the alkyl and hydroxyl moieties of the confined liquids. Uniquely, this relaxation behaviour is shown to correlate with adsorbate acidity, with the observed relationship rationalised on the basis of surface-adsorbate proton exchange dynamics.

scholarly journals Functional Group Resolved Nuclear Spin Relaxation in Porous Media

2021 ◽  
Author(s):  
Neil Robinson ◽  
Eric May ◽  
Michael Johns
Keyword(s):  
Spin Relaxation ◽  
Nuclear Spin ◽  
Functional Group ◽  
Proton Exchange ◽  
Nuclear Spin Relaxation ◽  
Separation Processes ◽  
Diverse Range ◽  
Non Invasive ◽  
Relaxation Measurements ◽  
Low Magnetic Field

Understanding solid-fluid interactions within porous materials is critical for their efficient utilisation across chemical reaction and separation processes. However, detailed characterisation of interfacial phenomena within such systems is hampered by their optically opaque nature. Motivated by the need to bridge this capability gap, we detail here the application of low magnetic field 2D <sup>1</sup>H nuclear spin relaxation measurements as a non-invasive probe of sorbate/sorbent interactions, exploring the relaxation characteristics exhibited by liquid adsorbates confined to a model mesoporous silica. For the first time, we demonstrate the capacity of such measurements to distinguish functional group-specific relaxation phenomena across a diverse range of protic adsorbates of wide importance as solvents, reagents, and hydrogen carriers, with distinct relaxation environments assigned to the alkyl and hydroxyl moieties of the confined liquids. Uniquely, this relaxation behaviour is shown to correlate with adsorbate acidity, with the observed relationship rationalised on the basis of surface-adsorbate proton exchange dynamics.

scholarly journals Dislocation dynamics in alkali halide single crystals investigated by nuclear spin relaxation measurements

1980 ◽  
Vol 41 (C6) ◽  
pp. C6-146-C6-149
Author(s):  
W. H. M. Alsem ◽  
A. W. Sleeswyk ◽  
H. J. Hackelöer ◽  
R. Münter ◽  
H. Tamler ◽  
...  
Keyword(s):  
Single Crystals ◽  
Spin Relaxation ◽  
Nuclear Spin ◽  
Alkali Halide ◽  
Dislocation Dynamics ◽  
Nuclear Spin Relaxation ◽  
Relaxation Measurements

NUCLEAR SPIN RELAXATION IN GASES AND LIQUIDS: III. MOMENTUM-DEPENDENT INTERACTIONS

1964 ◽  
Vol 42 (1) ◽  
pp. 70-83 ◽  
Author(s):  
I. Oppenheim ◽  
M. Bloom ◽  
H. C. Torrey
Keyword(s):  
Spin Relaxation ◽  
Nuclear Spin ◽  
Hard Spheres ◽  
Exact Calculation ◽  
Nuclear Spin Relaxation ◽  
Interatomic Potentials ◽  
Constant Acceleration ◽  
Relaxation Measurements ◽  
Good Agreement ◽  
Dependent Interaction

A momentum-dependent interaction has been used by Torrey to explain the Xe129 nuclear spin relaxation measurements of Carr and co-workers. T1 is calculated here for this interaction for gases and liquids using the constant-acceleration approximation. The gas results are in good agreement with Torrey's exact calculation for a gas of hard spheres, and have the advantage of being usable with more realistic interatomic potentials. The results for the liquid are in good agreement with experiment.

INTERACTION OF ELECTRON AND NUCLEAR SPINS IN QUANTUM WELLS

2007 ◽  
Vol 21 (08n09) ◽  
pp. 1266-1275
Author(s):  
KOJI MURAKI ◽  
NORIO KUMADA ◽  
YOSHIRO HIRAYAMA
Keyword(s):  
Quantum Wells ◽  
Spin Relaxation ◽  
Nuclear Spin ◽  
Optical Measurements ◽  
Antiferromagnetic Order ◽  
Double Quantum ◽  
Nuclear Spin Relaxation ◽  
Goldstone Mode ◽  
Nuclear Spins ◽  
Relaxation Measurements

We describe our resistively detected nuclear-spin relaxation measurements on bilayer electron systems in double quantum wells. The measurements were carried out to study the compressible-incompressible transition at total filling factor νtot = 1 and the canted antiferromagnetic order and its Goldstone mode predicted for νtot = 2. The data demonstrate how nuclear-spin relaxation can shed light on spin/pseudospin order and associated phase transitions that may not be visible through conventional transport or optical measurements.

Diffusivity and Nuclear Spin Relaxation Measurements at High Pressure in Methanol

1997 ◽  
Vol 499 ◽  
Author(s):  
R. F. Marzke ◽  
D. P. Raffaelle ◽  
G. H. Wolf ◽  
J. L. Yarger
Keyword(s):  
Spin Relaxation ◽  
Nuclear Spin ◽  
Hydrodynamic Radius ◽  
Relaxation Times ◽  
Einstein Relation ◽  
Nuclear Spin Relaxation ◽  
Simple Modification ◽  
Molecular Correlation ◽  
Relaxation Measurements ◽  
Diamond Anvil

ABSTRACTDiffusivity D and nuclear spin relaxation times T1 and T2 have been measured by NMR to 4.0 GPa in methanol, using a diamond anvil cell probe. In pure MeOH, D−1 and T2 show essentially identical activation volumes. However, these are ∼18% larger than the activation volume of viscosity. By relating these observations to an average molecular correlation time a pressure-dependent infinite-frequency shear modulus G∞ can be inferred, using two independent approaches. The relation between diffusivity and viscosity shows increasing departure from Stokes-Einstein behavior with increasing pressure, if a constant hydrodynamic radius is assumed. This departure is attributed to the pressure dependence of G∞, and can be described empirically by a simple modification of the Stokes-Einstein relation.

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