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DY: Fachverband Dynamik und Statistische Physik

DY 54: Statistical Physics: General II

DY 54.4: Vortrag

Donnerstag, 12. März 2026, 15:45–16:00, ZEU/0114

Ion and Water Density Profiles in Nano-Confinement — •Haoyuan Quan, Maximilian Becker, Hanne Antila, and Roland Netz — Freie Universität Berlin, Berlin, Germany

Confined salt solutions are important in biology and in technical applications, such as environmentally friendly energy conversion, yet even basic trends of how ion and water densities change in confinement remain unclear. Using molecular dynamics simulations of graphene slits in equilibrium with bulk aqueous salt solutions, we determine concentration profiles of a variety of alkali-halide ion pairs as a function of slit width and bulk concentration. Using ion and water depletion lengths, which clearly reflect ion-specific effects, we construct a robust and thermodynamically consistent theory to describe water and ion concentrations in confined systems for varying slit widths and bulk salt concentrations.

Keywords: nanoconfinement; molecular dynamics simulations; depletion length; graphene slit; ion-specific effects