Our MD simulations revealed the complex interplay between the adsorption of ions at the solid salt walls and the NMR relaxation time T 1 of water. By adsorbing at the solid walls, ions induce a net surface charge. The viscosity of water close to a charged surface is known to differ from its bulk value due, at least in part, to a redistribution of hydrogen bonding induced by the electric field . In addition to the build-up of a net surface charge (Fig. ), the adsorption of ions creates a rough landscape with inhomogeneous local charge distributions (Fig. ). In turn, these inhomogeneities induce a strong 2D water structuring in the x-y plane parallel to the solid surface (Fig. ), in addition to the structuring occurring in along the z direction that occurs even in absence of ion adsorption (Fig. ), which is likely to further impact the dynamics properties of the water molecules. The intricacy between salt concentration, surface atomic roughness, and surface charge inhomogeneity makes it difficult to isolate the relative importance of each phenomenon on T 1 , and simulations with comparatively simpler systems should be performed in the future.