Electrolyte in heterogeneous water-glucose mixtures: A view from experiment and molecular modeling
VK Laurinavichyute and SA Shermukhamedov and MA Peshkova and RR Nazmutdinov and GA Tsirlina, CHEMICAL PHYSICS, 526, UNSP 110440 (2019).
The mobilities and activities of ions in NaCl-glucose-water mixtures are probed by means of conductometry and potentiometry. A positive deviation of the limiting conductance from the Stokes-Einstein (SE) relation is observed. This striking effect is discussed in terms of 'excluded volume' concept for strongly heterogeneous liquids. A drastic difference between sodium cations and chloride anions is argued resting on measurements with ion selective electrodes. The microscopic structure of water-glucose solutions is thoroughly addressed by classical molecular dynamics (MD) method. The MD simulations reproduce qualitatively the main experimental findings; trends in the behavior of the Na+ and Cl- ions are attributed to a noticeable difference in the structure and dynamics of their solvation shells.
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