Spontaneous surface adsorption of aqueous graphene oxide by synergy with surfactants

Abstract

The spontaneous adsorption of graphene oxide (GO) sheets at the air--water interface is explored using X-ray reflectivity (XRR) measurements. As a pure aqueous dispersion, GO sheets do not spontaneously adsorb...

A Simple Method for High-Quality Ultra-Thin Graphene Oxide Films Facilitates Nanoscale Investigations of Ion and Water Adsorption

“…Dissolution of GO in the subphase has been acknowledged since early investigations. 10 To promote interfacial film formation, studies have suggested options such as sonicating the GO spreading solution to disperse flakes, 13 introducing additional surfactants, 14 bubbling nitrogen through the subphase to transport GO flakes to the surface, 15 or decreasing the droplet size of the GO spreading solution through electro-spraying. 16 The latter two options require additional equipment.…”

Ion and water adsorption to graphene and graphene oxide surfaces

“…83 While a detailed discussion of GO stability at other interfaces is beyond the scope of this review, it is worth noting that others have demonstrated stabilization of oil–water interfaces using GO 78 including spontaneous stabilization with additional surfactant molecules. 84,85…”

“…83 While a detailed discussion of GO stability at other interfaces is beyond the scope of this review, it is worth noting that others have demonstrated stabilization of oil-water interfaces using GO 78 including spontaneous stabilization with additional surfactant molecules. 84,85 4.2 Water organization: structural analyses Structural information about GO organization at the air-water interface can be determined using liquid-surface XR. XR measurements of Langmuir GO films showed variation in reflectivity signal as the films at different film compressions, which were determined by the measured surface pressure (Fig.…”

Reduction-enhanced water flux through layered graphene oxide (GO) membranes stabilized with H3O+ and OH− ions

“…[15][16][17][18][19] In particular graphene oxide (GO), a derivative of graphene, has been in focus for membrane applications owing to for example the presence of abundant oxygen containing functional groups, superior water flux, high selectivity, excellent fouling resistance, easy scalability, and high aspect ratio. [20][21][22][23][24][25][26][27] In graphene oxide (GO), the carbon atoms are organised in a tight monolayer honeycomb lattice with abundant oxygencontaining functional groups, including for instance epoxy, hydroxyl and carboxyl groups. 28 Owing to the presence of these functional groups, GO sheets can easily be dispersed in water.…”