NMR Relaxation and Pulsed Gradient NMR Diffusion Measurements of Ultrasonically Devulcanized Poly(dimethylsiloxane)

2002 ◽  
Vol 106 (46) ◽  
pp. 12072-12078 ◽  
Author(s):  
Sang E. Shim ◽  
Jennifer C. Parr ◽  
Ernst von Meerwall ◽  
Avraam I. Isayev
Keyword(s):  
Nmr Relaxation ◽  
Nmr Diffusion

Interaction of ferulic acid derivatives with human erythrocytes monitored by pulse field gradient NMR diffusion and NMR relaxation studies

2005 ◽  
Vol 134 (2) ◽  
pp. 109-117 ◽  
Author(s):  
Cecilia Anselmi ◽  
Francesca Bernardi ◽  
Marisanna Centini ◽  
Elena Gaggelli ◽  
Nicola Gaggelli ◽  
...  
Keyword(s):  
Ferulic Acid ◽  
Field Gradient ◽  
Nmr Relaxation ◽  
Human Erythrocytes ◽  
Pulse Field ◽  
Pulse Field Gradient ◽  
Relaxation Studies ◽  
Nmr Diffusion

scholarly journals NMR Investigation into the Influence of Surface Interactions on Liquid Diffusion in a Mesoporous Catalyst Support

2019 ◽  
Vol 63 (3-4) ◽  
pp. 319-327 ◽  
Author(s):  
Neil Robinson ◽  
Carmine D’Agostino
Keyword(s):  
Catalyst Support ◽  
Nmr Relaxation ◽  
Primary Alcohols ◽  
Mesoporous Catalyst ◽  
Porous Catalyst ◽  
Self Diffusion ◽  
Non Invasive ◽  
Diffusion Characteristics ◽  
Diffusion Dynamics ◽  
Nmr Diffusion

AbstractPulsed field gradient NMR diffusion measurements provide a non-invasive measure of the mass transport (self-diffusion) characteristics of liquids confined to porous catalyst materials. Here we explore the ability of this technique to probe the diffusive behaviour of a series of short-chain primary alcohols within a mesoporous catalyst support material; through the comparison of our results with highly surface-sensitive NMR relaxation data, we show that the evaluation of bulk-pore diffusion dynamics may provide a simple and indirect method to access and explore surface interaction phenomena occurring at the catalyst-liquid interface.

scholarly journals Sensitivity of Proton NMR Relaxation and Proton NMR Diffusion Measurements to Olive Oil Adulterations with Vegetable Oils

2021 ◽  
Author(s):  
Donatella Ancora ◽  
Jerneja Milavec ◽  
Anton Gradišek ◽  
Mario Cifelli ◽  
Ana Sepe ◽  
...  
Keyword(s):  
Olive Oil ◽  
Vegetable Oils ◽  
Proton Nmr ◽  
Nmr Relaxation ◽  
Nmr Diffusion

scholarly journals NMR relaxation and modelling study of the dynamics of SF6 and Xe in porous organic cages

2019 ◽  
Vol 21 (44) ◽  
pp. 24373-24382 ◽  
Author(s):  
Pär Håkansson ◽  
Muhammad Asadullah Javed ◽  
Sanna Komulainen ◽  
Linjiang Chen ◽  
Daniel Holden ◽  
...  
Keyword(s):  
Molecular Level ◽  
Nmr Relaxation ◽  
Porous Solid ◽  
Relaxation Experiments ◽  
Nmr Diffusion ◽  
Modelling Study

The dynamics of gas in CC3 porous solid is explored with NMR diffusion and relaxation experiments and interpreted with molecular level modeling.

Mononucleotides 31P NMR relaxation measurement

1983 ◽  
Vol 80 ◽  
pp. 831-832 ◽  
Author(s):  
A.M. Avedikian ◽  
D. Besserre ◽  
M. Delepierre
Keyword(s):  
31P Nmr ◽  
Nmr Relaxation ◽  
Relaxation Measurement

1H-NMR RELAXATION STUDIES ON THE NATURE OF THE SEMICONDUCTING STATE OF (TMTTF)2Br AND (TMTTF)2PF6: MAGNETISM

1983 ◽  
Vol 44 (C3) ◽  
pp. C3-1095-C3-1097
Author(s):  
T. Takahashi ◽  
F. Creuzet ◽  
D. Jérôme ◽  
J. M. Fabre
Keyword(s):  
1H Nmr ◽  
Nmr Relaxation ◽  
Relaxation Studies

Structure and Dynamics of Spherical and Rodlike Alkyl Ethoxylate Surfactant Micelles Investigated Using NMR Relaxation and Atomistic Molecular Dynamics Simulations

2019 ◽  
Author(s):  
Allison Edwards ◽  
Abdolreza Javidialesaadi ◽  
Katie Weigandt ◽  
George Stan ◽  
Charles Eads
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Nmr Relaxation ◽  
Cross Relaxation ◽  
Relaxation Rates ◽  
Surfactant Micelles ◽  
Cylindrical Micelles ◽  
Spherical Micelles ◽  
Dynamics Simulations ◽  
Relative Motions

We study molecular arrangements and dynamics in alkyl ethoxylate nonionic surfactant micelles by combining high field (600 and 700 MHz) NMR relaxation measurements with large-scale atomistic molecular dynamics simulations. For spherical micelles, but not for cylindrical micelles, cross relaxation rates are positive only for surfactant alkyl tail atoms connected to the hydrophilic head group. All cross relaxation rates are negative for cylindrical micelles. This effect is reproducible either by changing composition (ratios of the nonionic surfactants) or changing temperature of a single surfactant in order to change the micelle shape. We validate the micelle shape by SANS and use the results as a guide for our simulations. We calculate parameters that determine relaxation rates directly from simulated trajectories, without introducing specific functional forms. Results indicate that relative motions of nearby atoms are liquid-like, in agreement with 13C T1 measurements, though constrained by micelle morphology. Relative motions of distant atoms have slower components because the relative changes in distances and angles are smaller when the moving atoms are further apart. The slow, long-range motions appear to be responsible for the predominantly negative cross relaxation rates observed in NOESY spectra. The densities of atoms from positions 1 and 2 in the boundary region are lower in spherical micelles compared to cylindrical micelles. Correspondingly, motions in this region are less constrained by micelle morphology in the spherical compared to the cylindrical cases. The two effects of morphology lead to the unusual occurrence of positive cross relaxation involving positions 1 and 2 for spheres.

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