Dynamics of water in metal ion intercalated graphene oxide.

When water is confined on a nanometer scale, it exhibits several unusual behaviors which include ordering, viscoelasticity, and long relaxation times. The presence of ions further changes properties of water because ions influence ordering and interactions. Different ions, according to the Hofmeister series, have different effects on ordering and dynamics of confined water. The combination of Quasi Elastic Neutron Scattering and Atomic Force Microscopy allow us to measure the dynamics and viscoelasticity of water in GO membranes at different time scales for direct comparison of dynamics and viscosity, while matching size, composition, and temperature conditions. In the talk, we would like to present how the presence of three different cations (structure former, Na+, structure "destroyer", Cs+ and a "intermediate" ion, K+) will affect the interlayer and intra-layer diffusion and viscosity of water in GO.