Diffusion Dynamics of Water and Ethanol in Graphene Oxide

• DOI: 10.1021/acs.jpcb.2c08960
• Publication Date: 2023-08-09T16:08:48Z
• Authors: Gobin Raj Acharya; Madhusudan Tyagi; Eugene Mamontov; Peter M. Hoffmann

We utilized the momentum transfer (Q)-dependence of quasi-elastic neutron scattering (QENS) to measure dynamics water and ethanol confined in graphene oxide (GO) powder or membranes at different temperatures orientations. found reduced diffusivities (up 30% case water) a depression dynamic transition temperatures. While showed near Arrhenius behavior with an almost bulk-like activation barrier temperature range 280-310 K, diffusivity little dependence. For both ethanol, we evidence for immobile mobile fractions liquid. The fraction exhibited jump diffusion, length consistent expected average spacing hydroxide groups GO surfaces. From anisotropy measurements, weak species geometry species.