Insight into the Nanoscale Mechanism of Rapid H2O Transport within a Graphene Oxide Membrane: Impact of Oxygen Functional Group Clustering

• DOI: 10.1021/acsami.5b08824
• Publication Date: 2015-12-14T11:10:05Z
• Authors: Shuai Ban; Jing Xie; Yajun Wang; Bo Jing; Bei Liu; Hongjun Zhou
• Keywords: Thermogravimetric analysis

Realistic models of graphene oxide membranes were developed and validated to interpret the exceptional water permeation in association with X-ray photoelectron spectroscopy, thermogravimetric differential scanning calorimetry analysis, dynamic vapor sorption measurements. With respect GO oxidization level, surface distributions functionalized domains analyzed line TEM observations, 3 types interlayer slit pores identified. The hydrophilicity degrees as-defined strongly influence their H2O uptake capacities. Calculated enthalpies isotherms are good agreement experimental data, results indicate dominant role dipole interactions. expansion shows a transition from interstratification an monolayer accumulation multilayers at distance 0.8 nm. evolution both hydrogen bonds diffusivities suggests existence three species different binding states molecular mobilities. computed permeability on basis sorption-diffusion theory supports transport capacity membranes.