Surface Rotational Dynamics of Liquids Confined in Nanopores

1996 ◽  
Vol 464 ◽  
Author(s):  
J.-P. Korb ◽  
L. Malier ◽  
F. Cros ◽  
Shu Xu ◽  
J. Jonas
Keyword(s):  
Relaxation Times ◽  
Nmr Relaxation ◽  
Rotational Dynamics ◽  
Surface Relaxation ◽  
Nanoporous Silica ◽  
Silica Glasses ◽  
H Nmr ◽  
Fast Exchange ◽  
Nmr Relaxation Times ◽  
Different Time Scales

ABSTRACT2H NMR relaxation times of selectively deuterated polar molecules confined to a set of calibrated nanoporous silica glasses are reported. These experiments, combined with the consideration of different time scales in the theory of surface relaxation, show how confinement effects can provide detailed information on the rotational dynamics of temporarily adsorbed liquid layers in presence of biphasic fast exchange.

A study of aqueous sodium cholate by 2H nmr

1981 ◽  
Vol 59 (11) ◽  
pp. 1602-1606 ◽  
Author(s):  
William B. Smith ◽  
Gareth D. Barnard
Keyword(s):  
Relaxation Times ◽  
Nmr Relaxation ◽  
Sodium Cholate ◽  
2H Nmr ◽  
Hydrogen Bonding Interaction ◽  
Aqueous Sodium ◽  
H Nmr ◽  
Tetramer Formation ◽  
Bonding Interaction ◽  
Nmr Relaxation Times

Solutions of aqueous sodium 7-2H-cholate have been studied as a function of cholate concentration by 2H nmr. Relaxation times and solution viscosities have been used to show that cholate is monomeric in solution at 0.1 M. Increasing concentration leads to tetramer formation which is complete at 0.1 M. The tetramer solutions are stable up to 55 °C. Solutions of cholate in aqueous pyridine also form tetramers in the same fashion. Evidence was found, however, for a weak hydrogen bonding interaction between the two.

Molecular Motion in Solid Tetramethylammonium Tetrafluoroborate

1992 ◽  
Vol 47 (6) ◽  
pp. 721-727 ◽  
Author(s):  
S. Torre ◽  
P. Ferloni
Keyword(s):  
Phase Transition ◽  
Relaxation Times ◽  
Nmr Relaxation ◽  
Quadrupole Coupling Constant ◽  
Thermomechanical Analysis ◽  
Scanning Calorimetry ◽  
Disorder Phase Transition ◽  
H Nmr ◽  
Quadrupole Coupling ◽  
Nmr Relaxation Times

AbstractMeasurements of 11B and 1H NMR relaxation times, differential scanning calorimetry and thermomechanical analysis, carried out on polycrystalline (CH3)4 NBF4 from room temperature to about 100 K, have permitted to discuss the crystal dynamics of this salt and to analyze the nature of the phase transition occurring at ≈ 150 K. Moreover, by means of an evaluation of the 11B quadrupole coupling constant, information about the position of the F atoms has been obtained. An explanation of the NMR data in terms of an order-disorder phase transition involving the F- ions is given.

scholarly journals Proton NMR relaxation times in ischemic brain edema.

Stroke ◽  
1986 ◽  
Vol 17 (6) ◽  
pp. 1149-1152 ◽  
Author(s):  
Y Horikawa ◽  
S Naruse ◽  
C Tanaka ◽  
K Hirakawa ◽  
H Nishikawa
Keyword(s):  
Brain Edema ◽  
Relaxation Times ◽  
Proton Nmr ◽  
Nmr Relaxation ◽  
Ischemic Brain ◽  
Ischemic Brain Edema ◽  
Nmr Relaxation Times

Effects of hydrophobic treatments of stone on pore water studied by continuous distribution analysis of NMR relaxation times

2001 ◽  
Vol 19 (3-4) ◽  
pp. 509-512 ◽  
Author(s):  
L. Appolonia ◽  
G.C. Borgia ◽  
V. Bortolotti ◽  
R.J.S. Brown ◽  
P. Fantazzini ◽  
...  
Keyword(s):  
Pore Water ◽  
Relaxation Times ◽  
Continuous Distribution ◽  
Nmr Relaxation ◽  
Distribution Analysis ◽  
Nmr Relaxation Times

Reduction in the proton NMR relaxation times of dystrophic muscles following functional improvement

1984 ◽  
Vol 2 (3) ◽  
pp. 250-251 ◽  
Author(s):  
L.K. Misra ◽  
P.A. Narayana ◽  
D. Bearden ◽  
T. Egan ◽  
R.P. Munjaal ◽  
...  
Keyword(s):  
Relaxation Times ◽  
Proton Nmr ◽  
Nmr Relaxation ◽  
Functional Improvement ◽  
Nmr Relaxation Times
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