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Anomalous Dielectric Behavior of Nanoconfined Electrolytic Solutions

Abstract : We report an anomalous dielectric effect of electrolytes under cylindrical nanoconfinement. In bulk phase, the decrease in the water dielectric constant ( ) with increasing salt concentration is well known, and is due to dielectric saturation. From molecular dynamic simulations of confined water and NaCl solutions, we show a dielectric anisotropy and an unexpected increase in ? of NaCl solutions with respect to the confined pure liquid until a critical concentration is reached. We infer that this striking dielectric behavior results from the interplay between the effect of confinement and that of ions on the water hydrogen bonding network.
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Haochen Zhu, Aziz Ghoufi, Anthony Szymczyk, Béatrice Balannec, Denis Morineau. Anomalous Dielectric Behavior of Nanoconfined Electrolytic Solutions. Physical Review Letters, American Physical Society, 2012, 109 (107801), pp.1-5. ⟨10.1103/PhysRevLett.109.107801⟩. ⟨hal-00878917⟩



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