Enhanced graphitic domains of unreduced graphene oxide and the interplay of hydration behaviour and catalytic activity

Understanding water transport through graphene-based nanochannels via experimental control of slip length

“…This is surprising as a decreased interlayer space should offer less room for the water to travel. As reported in our previous study and by others, this is true for untreated GO where smaller interlayer space resulted in a decline in water flux 18,22 . It may be further noted that all cation intercalated membranes in this study show a decreased water flux in comparison with untreated GO.…”

“…GO consists of functionalized and graphitic domains. In GOMs the water flux is considered to mainly move along the graphitic domains 2,18 . The water flux along graphene-based nanochannels is often described based on the Hagen-Poiseuille equation considering a large slip length that exceeds the channel width 26,27 .…”

Understanding water transport through graphene-based nanochannels via experimental control of slip length

“…This is surprising as a decreased interlayer space should offer less room for the water molecules to travel. As reported in our previous study and by others, this is true for untreated GO where smaller interlayer space resulted in a decline in water flux 20,24 .…”

“…GO consists of functionalized and graphitic domains. In GOMs the water flux is considered to mainly move along the graphitic domains 2,20 . The water flux along graphene-based nanochannels is often described based on the Hagen-Poiseuille equation considering a large slip length that exceeds the channel width 28,29 .…”

The Role of Surface Ionisation in the Hydration-Induced Swelling of Graphene Oxide Membranes

“…[1,23,[29][30][31] A deeper understanding of how the surface chemistry of GO membranes affect the swelling properties and the water adsorption mechanism, can be exploited to tune the size of d by altering the oxidation pathway to control the amount of functional groups available on the surface of GO flake or by heat treatment to reduce the oxidised area on the flake. [32] In this work the role of ionised functional groups on water adsorption at various humidity conditions and the induced swelling of GO membrane in liquid water was investigated using molecular simulations. Specifically, the Grand Canonical Monte Carlo (GCMC) and Molecular Dynamics (MD) techniques were employed in combination with atomistic models of GO membranes that consider the ionisation of hydroxyl functional groups on the surface of GO flakes.…”