Dedic, J.Okur, H. I.Roke, S.2020-01-152020-01-152020-01-152019-12-0110.1126/sciadv.aay1443https://infoscience.epfl.ch/handle/20.500.14299/164604WOS:000505069600071Ions interact with water via short-ranged ion-dipole interactions. Recently, an additional unexpected long-ranged interaction was found: The total electric field of ions influences water-water correlations over tens of hydration shells, leading to the Jones Ray effect, a 0.3% surface tension depression. Here, we report such long-range interactions contributing substantially to both molecular and macroscopic properties. Femtosecond elastic second harmonic scattering (fs-ESHS) shows that long-range electrostatic interactions are remarkably strong in aqueous polyelectrolyte solutions, leading to an increase in water-water correlations. This increase plays a role in the reduced viscosity, which changes more than two orders of magnitude with polyelectrolyte concentration. Using D2O instead of H2O shifts both the fs-ESHS and the viscosity curve by a factor of similar to 10 and reduces the maximum viscosity value by 20 to 300%, depending on the polyelectrolyte. These phenomena cannot be explained using a mean-field approximation of the solvent and point to nuclear quantum effects.Multidisciplinary SciencesScience & Technology - Other Topicshyper-rayleigh-scatteringcounterion condensationaqueous-solutionssodium-chlorideionsdependencemoleculesproteinsbehaviorsystemstext::journal::journal article::research article