Proton Spin Relaxation and Mobility in Hydrous Melts
| Autor: | L. L. Brown, A. L. Bacarella, B. M. Benjamin, C. Girard, J. Braunstein |
|---|---|
| Rok vydání: | 1977 |
| Předmět: |
Arrhenius equation
Renewable Energy Sustainability and the Environment Chemistry Diffusion Inorganic chemistry Intermolecular force Relaxation (NMR) Hadron Analytical chemistry Condensed Matter Physics Calcium nitrate Surfaces Coatings and Films Electronic Optical and Magnetic Materials symbols.namesake chemistry.chemical_compound Viscosity Intramolecular force Materials Chemistry Electrochemistry symbols |
| Zdroj: | Journal of The Electrochemical Society. 124:844-849 |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/1.2133424 |
| Popis: | Pulse and continuous wave NMR measurements are reported for protons in hydrous melts of calcium nitrate at temperatures between -4/sup 0/ and 120/sup 0/C. At temperatures near 50/sup 0/C mean Arrhenius coefficients, ..delta..H/sub T//sub 1/ (kcal/mole), are 7.9, 7.3, and 4.8, respectively, for melts containing 2.8, 4.0, and 8.0 moles of water per mole of calcium nitrate, compared to 4.6 kcal/mole for pure water. Temperature dependence of T/sub 1/ and T/sub 2/ in Ca(NO/sub 3/)/sub 2/-2.8 H/sub 2/O between -4/sup 0/ and 120/sup 0/C are non-Arrhenius and can be represented by a Fulcher-type equation with a ''zero mobility temperature'' (T/sub 0/) of 225/sup 0/K, close to the value of T/sub 0/ for solute diffusion, electrical conductance, and viscosity. Resolution of the relaxation rates into correlation times for intramolecular (rotational) and intermolecular (translational) diffusional motion is discussed in terms of the Bloembergen-Purcell-Pound and more recent models for dipolar relaxation. |
| Databáze: | OpenAIRE |
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