scholarly journals The Effect of Clay Content on the Spin–Spin NMR Relaxation Time Measured in Porous Media

ACS Omega ◽  
2020 ◽  
Vol 5 (12) ◽  
pp. 6545-6555
Author(s):  
Mahmoud Elsayed ◽  
Guenther Glatz ◽  
Ammar El-Husseiny ◽  
Abdullah Alqubalee ◽  
Abdulrauf Adebayo ◽  
...  
Keyword(s):  
Porous Media ◽  
Relaxation Time ◽  
Nmr Relaxation ◽  
Clay Content ◽  
Nmr Relaxation Time

A laboratory study of the effect of clay, silt, and sand content on low-field NMR relaxation time distributions

Geophysics ◽  
2021 ◽  
pp. 1-34
Author(s):  
Yonghui Peng ◽  
Kristina Keating
Keyword(s):  
Relaxation Time ◽  
Relaxation Times ◽  
Nmr Relaxation ◽  
Clay Content ◽  
High Specific Surface Area ◽  
Unconsolidated Sediments ◽  
Sand Content ◽  
Kaolinite Clay ◽  
Nmr Study ◽  
Nmr Relaxation Time

We have developed a laboratory nuclear magnetic resonance (NMR) study to investigate the effect of clay, silt, and sand content on the NMR relaxation time distribution. Transverse NMR relaxation times ( T2) were determined for water-saturated unconsolidated sediment mixtures of 1%–60% kaolinite clay, 5%–85% silt-size glass beads, and 8%–94% quartz sand by mass. Nearly all of the mixtures were characterized by a unimodal T2 distribution. When clay is present in quantities greater than 10%, the clay content dominates the response. For these samples, the mean-log relaxation times ( T2ML) range from 0.03 to 0.06 s, regardless of silt or sand content. For mixtures with <10% clay, T2ML decreases with increasing clay content. When the clay content is kept the same, T2ML decreases with increasing silt content and increases with the increasing sand content. The strong effect of the clay content on the NMR response is due to the high specific surface area of the clay and the distribution of clay throughout the samples. These results will help improve the interpretation of NMR field data in soils and unconsolidated sediments.

scholarly journals Solvent inhibition in the liquid-phase catalytic oxidation of 1,4-butanediol: understanding the catalyst behaviour from NMR relaxation time measurements

2016 ◽  
Vol 6 (21) ◽  
pp. 7896-7901 ◽  
Author(s):  
Carmine D'Agostino ◽  
Mark R. Feaviour ◽  
Gemma L. Brett ◽  
Jonathan Mitchell ◽  
Andrew P. E. York ◽  
...  
Keyword(s):  
Relaxation Time ◽  
Liquid Phase ◽  
Catalytic Oxidation ◽  
Heterogeneous Catalysts ◽  
Nmr Relaxation ◽  
Nmr Relaxation Time

Solvent inhibition over surfaces affects behaviour and performances of heterogeneous catalysts.

Molecular Dynamics of Cellulose-Water Systems Investigated by NMR Relaxation Method

Holzforschung ◽  
2000 ◽  
Vol 54 (5) ◽  
pp. 501-504 ◽  
Author(s):  
K. Banas ◽  
B. Blicharska ◽  
W. Dietrich ◽  
M. Kluza
Keyword(s):  
Molecular Dynamics ◽  
Relaxation Time ◽  
Nmr Relaxation ◽  
Relaxation Method ◽  
Water Systems ◽  
Motion Model ◽  
Cellulose Pulp ◽  
Time Dependencies ◽  
Nmr Relaxation Time ◽  
Different Origin

Summary On the basis of the proton NMR relaxation time dependencies on temperature and frequency in cellulose pulp a simple two-motion model of molecular dynamics has been proposed. The parameters, activation energies and correlation times, describing the model may be correlated with structure features such as level of crystallinity of cellulose with different origin, as well as degree of paper devastation.

Evaluation of the time-dependent stability of starch–hydrocolloid binary gels involving NMR relaxation time measurements

2012 ◽  
Vol 109 (4) ◽  
pp. 685-690 ◽  
Author(s):  
Hanna Maria Baranowska ◽  
Marek Sikora ◽  
Magdalena Krystyjan ◽  
Piotr Tomasik
Keyword(s):  
Relaxation Time ◽  
Nmr Relaxation ◽  
Time Dependent ◽  
Nmr Relaxation Time
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