Swelling of graphene oxide membranes in alcohols: effects of molecule size and air ageing

Iakunkov, Artem; Sun, Jinhua; Ребрикова, А.Т.; Korobov, M.V.; Klechikov, Alexey; Vorobiev, Alexeï; Boulanger, Nicolas; Talyzin, Alexandr V.

doi:10.1039/c9ta01902b

Cited by 45 publications

(78 citation statements)

References 44 publications

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“…When GO powder is mixed with ethanol (or methanol), the solvent molecules intercalate into the inter-flake gallery, leading to an expansion in flake separation. A wide range of separations has been reported, from approximately 9 to 16 Å, [2,17] the latter corresponding to the bilayer of polymer observed in our PVA simulations. The zeta potential of GO in ethanol is low, indicating the GO flakes are relatively uncharged, [18] analogous to the neutral GO flakes in our simulations.…”

Section: Doi: 101002/adma202003213supporting

confidence: 56%

“…[1] The composition may also change over time. [2] It is of no surprise, then, that with edge sites compared to sites on the basal surface (5%) ensures that edge effects are not important in our conclusions and that our results can be extrapolated to larger sizes of GO flakes. Each coarse-grained simulation contains five hexagonal GO flakes with a volume fraction of approximately 3.5 %.…”

Section: Doi: 101002/adma202003213mentioning

confidence: 62%

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Principles Governing Control of Aggregation and Dispersion of Graphene and Graphene Oxide in Polymer Melts

2020

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Controlling the structure of graphene and graphene oxide (GO) phases is vitally important for any of its widespread intended applications: highly ordered arrangements of nanoparticles are needed for thin‐film or membrane applications of GO, dispersed nanoparticles for composite materials, and 3D porous arrangements for hydrogels. By combining coarse‐grained molecular dynamics and newly developed accurate models of GO, the driving forces that lead to the various morphologies are resolved. Two hydrophilic polymers, poly(ethylene glycol) (PEG) and poly(vinyl alcohol) (PVA), are used to illustrate the thermodynamically stable morphologies of GO and relevant dispersion mechanisms. GO self‐assembly can be controlled by changing the degree of oxidation, varying from fully aggregated over graphitic domains to intercalated assemblies with polymer bilayers between sheets. The long‐term stability of a dispersion is extremely important for many commercial applications of GO composites. For any degree of oxidation, GO does not disperse in PVA as a thermodynamic equilibrium product, whereas in PEG dispersions are only thermodynamically stable for highly oxidized GO. These findings—validated against the extensive literature on GO systems in organic solvents—furnish quantitative explanations for the empirically unpredictable aggregation characteristics of GO and provide computational methods to design directed synthesis routes for diverse self‐assemblies and applications.

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Section: Doi: 101002/adma202003213supporting

confidence: 56%

Section: Doi: 101002/adma202003213mentioning

confidence: 62%

Principles Governing Control of Aggregation and Dispersion of Graphene and Graphene Oxide in Polymer Melts

2020

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“…53,54 Moreover the swelling is sensitive to ageing and modies signicantly aer prolonged air-storage of membranes. 28 Therefore, a lot of efforts were recently aimed on the preparation of GO membranes with negligible swelling. 17,[55][56][57] Using PrGO/TKAM for the preparation of membranes with reduced swelling can be proposed as a plausible alternative.…”

Section: Resultsmentioning

confidence: 99%

“…1,21 The expansion of the GO lattice due to swelling provides "permeation channels", which is important in membrane applications of multilayered graphene oxide materials. [22][23][24] Numerous attempts to control the interlayer spacing using intercalation of certain cations into GO membrane lattice have been reported. 25 The swelling properties of GO are drastically different for GO produced using Brodie and Hummers oxidations.…”

Section: Introductionmentioning

confidence: 99%

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Thermally reduced pillared GO with precisely defined slit pore size

et al. 2020

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Fungal Cell Wall‐Graphene Oxide Microcomposite Membrane for Organic Solvent Nanofiltration

Zhang

Liu

et al. 2021

Adv Funct Materials

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High permeability and selectivity have long been pursued in membrane separation technology. However, this purpose remains a paramount challenge for molecular separations mainly limited by the trade‐off between permeance and ‐selectivity. Here, a bio‐utilization strategy based on deep understanding of bio‐features to fabricate a cell wall‐graphene oxide microcomposite membrane for organic solvent nanofiltration is rationally designed. The membrane displays a unique configuration with alternating stacking of cell wall layers and ultrathin graphene oxide layers. Moreover, the interactions between the cell wall and graphene oxide as well as between the membrane and solvent are mainly revealed by all atom molecular dynamics to uncover the possible working principle of the membrane. Specifically, the strong graphene oxide‐cell wall interaction and anti‐swelling behavior of the cell wall together restrict the expansion of the graphene oxide layer to promise high selectivity. Meanwhile, the well‐developed porosity of the cell wall allows a high throughput of various solvents through the membrane, showing excellent rejection for small molecules and solvent permeance as high as 56 L m2 h1 bar−1. The proposed cell wall microcomposite 2D structure could encourage the practical applications of GO‐based membranes.

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Swelling of graphene oxide membranes in alcohols: effects of molecule size and air ageing

Abstract: Swelling of Hummers graphene oxide (HGO) membranes in a set of progressively longer liquid alcohols (methanol to 1-nonanol) was studied using synchrotron radiation XRD after air ageing over prolonged periods of time.

Cited by 45 publications

References 44 publications

Principles Governing Control of Aggregation and Dispersion of Graphene and Graphene Oxide in Polymer Melts

Principles Governing Control of Aggregation and Dispersion of Graphene and Graphene Oxide in Polymer Melts

Thermally reduced pillared GO with precisely defined slit pore size

Fungal Cell Wall‐Graphene Oxide Microcomposite Membrane for Organic Solvent Nanofiltration

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