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Ion Relaxation in Aqueous Polyethyleneoxide Solutions Studied by Nuclear Magnetic Relaxation

1988; Volume: 92; Issue: 2 Linguagem: Inglês

10.1002/bbpc.198800037

0005-9021

Jolien van Breen, L. Huis, J. De Bleijser, J. C. Leyte,

Advanced NMR Techniques and Applications

Abstract The nuclear magnetic relaxation rates of some ions are studied in aqueous PEO solutions. The relative molal increase of the ion relaxation is obtained for a number of ions. In a limited range the DP‐dependence, salt concentration dependence and temperature dependence are investigated. The quadrupolar relaxation mechanism of ions provides a means to investigate the ion hydration complex. The enhancement of the ion relaxation rate by the presence of PEO is interpreted by an ion hydrationcomplex‐PEO interaction. Two dynamical models are evaluated. One of the models is able to explain the NMR results and does not contradict the results obtained from neutron diffraction experiments.