Lang, Elmar and Bradl, S. and Fink, W. and Radkowitsch, H. and Girlich, D.
Nuclear magnetic resonance studies of supercooled aqueous electrolyte solutions.
Journal of Physics: Condensed Matter 2, Supplem, p. 195.
Other URL: http://iopscience.iop.org/0953-8984/2/S/028?fromSearchPage=true
The dynamic properties of water molecules coordinated to simple ions (alkali and alkali-earth halides) and hydrophobic ions (tetraalkylammonium (TAA) halides) in supercooled solutions have been investigated with NMR. The study of spin-lattice relaxation rates and self-diffusion coefficients as functions of temperature, pressure Larmor frequency and concentration reveals characteristic features of molecular motions close to the low-temperature limit of the metastable phase (percolation transition and glass transition) and provides certain details of the local arrangement of water molecules in the coordination sphere of these ions. The intramolecular flexibility of the alkyl chains of the hydrated TAA cations has been investigated also. The dynamics of the methyl group reorientation provide a sensitive probe of structural differences in these solutions.
|Institutions:|| Biology, Preclinical Medicine > Institut für Biophysik und physikalische Biochemie > Prof. Dr. Elmar Lang|
|76.60.Es Relaxation effects ||PACS|
|64.70.P- Glass transitions of specific systems||PACS|
|66.30.H- Self-diffusion and ionic conduction in nonmetals||PACS|
|64.60.A- Specific approaches applied to studies of phase transitions||PACS|
|64.60.My Metastable phases||PACS|
|Subjects:||500 Science > 570 Life sciences|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||22 Oct 2010 08:19|
|Last Modified:||16 Nov 2012 12:44|