Temperature Dependence of Proton Relaxation Times in Aqueous Solution of Paramagnetic Ions. II. CrCl3

1960 ◽  
Vol 33 (5) ◽  
pp. 1593-1594 ◽  
Author(s):  
Thomas H. Brown ◽  
Robert A. Bernheim ◽  
H. S. Gutowsky
Keyword(s):  
Aqueous Solution ◽  
Temperature Dependence ◽  
Relaxation Times ◽  
Proton Relaxation ◽  
Paramagnetic Ions

Temperature Dependence of Proton Relaxation Times in Aqueous Solutions of Paramagnetic Ions

1959 ◽  
Vol 30 (4) ◽  
pp. 950-956 ◽  
Author(s):  
Robert A. Bernheim ◽  
Thomas H. Brown ◽  
H. S. Gutowsky ◽  
D. E. Woessner
Keyword(s):  
Aqueous Solutions ◽  
Temperature Dependence ◽  
Relaxation Times ◽  
Proton Relaxation ◽  
Paramagnetic Ions

Protonenspinrelaxation von Benzol an Silikageloberflächen

1968 ◽  
Vol 23 (3) ◽  
pp. 339-347
Author(s):  
D. Michel
Keyword(s):  
Temperature Dependence ◽  
Magnetic Relaxation ◽  
Spin Echo ◽  
Relaxation Times ◽  
Proton Relaxation ◽  
Relaxation Rates ◽  
Proton Proton ◽  
Proton Interaction ◽  
Paramagnetic Impurities ◽  
Hydroxyl Protons

Using spin-echo-techniques the temperature dependence of the proton magnetic relaxation times T1 and T2 of adsorbed benzene has been measured in the interval between +70 °C and —140 °C. Normal benzene C6H6 and mixtures of benzene and C6D6e were adsorbed on two sorts of silicagels which have been described elsewhere 4,9.The effective nuclear magnetic relaxation rates of adsorbed benzene are given by four contributions: the intramolecular proton-proton interaction, the interaction between benzene protons and paramagnetic impurities of the adsorbents, the interaction between benzene protons and hydroxyl protons on the silicagel surface, and the intermolecular interaction between benzene protons. These proton relaxation mechanisms depend differently on the H/D-ratio in C6H6—C6D6 mixtures (see section 4.1).The temperature dependence of the contributions 1/T1 intra and 1/T2 intra due to intramolecular proton-proton interaction suggests an anisotropic rotation of benzene molecules on the gel used. Furthermore, the existence of three different regions for the adsorbed benzene molecules has been inferred (see sections 4.2 and 5).

The influence of Fe, Cu, SiO2, TiO2, and Al2O3 nanoparticles in aqueous solution on proton relaxation times

2011 ◽  
Vol 20 (1) ◽  
pp. 55-63
Author(s):  
E. G. Bagryanskaya ◽  
O. A. Krumkacheva ◽  
A. E. Belikov ◽  
V. A. Mal’tsev ◽  
S. A. Novopashin
Keyword(s):  
Aqueous Solution ◽  
Relaxation Times ◽  
Proton Relaxation ◽  
Al2o3 Nanoparticles

Cellular water and proton relaxation times of Thai rice kernels during grain development and storage

2019 ◽  
Vol 88 ◽  
pp. 65-70 ◽  
Author(s):  
Klitsadee Yubonmhat ◽  
Suriya Chinwong ◽  
Nattawoot Maleelai ◽  
Nath Saowadee ◽  
Wiwat Youngdee
Keyword(s):  
Relaxation Times ◽  
Proton Relaxation ◽  
Grain Development ◽  
Cellular Water ◽  
And Storage

Bonded Hydrogen and Trapped H2 in a-Si1−xGex:H Alloys

1989 ◽  
Vol 149 ◽  
Author(s):  
E. J. Vanderheiden ◽  
G. A. Williams ◽  
P. C. Taylor ◽  
F. Finger ◽  
W. Fuhs
Keyword(s):  
Temperature Dependence ◽  
Molecular Hydrogen ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
H Nmr ◽  
Local Environments

ABSTRACT1H NMR has been employed to study the local environments of bonded hydrogen and trapped molecular hydrogen (H2) in a series of a-Si1−xGex:H alloys. There is a monotonic decrease of bonded hydrogen with increasing x from ≈ 10 at. % at x = 0 (a-Si:H) to ≈ 1 at. % at x = 1 (a-Ge:H). The amplitude of the broad 1H NMR line, which is attributed to clustered bonded hydrogen, decreases continuously across the system. The amplitude of the narrow 1H NMR line, which is attributed to bonded hydrogen essentially randomly distributed in the films, decreases as x increases from 0 to ≈ 0.2. From x = 0.2 to x ≈ 0.6 the amplitude of the narrow 1H NMR line is essentially constant, and for x ≥ 0.6 the amplitude decreases once again. The existence of trapped H2 molecules is inferred indirectly by their influence on the temperature dependence of the spin-lattice relaxation times, T1. Through T1, measurements it is determined that the trapped H2 concentration drops precipitously between x = 0.1 and x = 0.2, but is fairly constant for 0.2 ≤ x ≤ 0.6. For a-Si:H (x = 0) the H2 concentration is ≈ 0.1 at. %, while for x ≥ 0.2 the concentration of H2 is ≤ 0.02 at. %.

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