A simple method for floating graphene oxide films facilitates nanoscale investigations of ion and water adsorption

Kumal, Raju R.; Carr, Amanda J.; Uysal, Ahmet

doi:10.1039/d3ra07254a

RSC Adv.

2024

DOI: 10.1039/d3ra07254a

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A simple method for floating graphene oxide films facilitates nanoscale investigations of ion and water adsorption

Raju R. Kumal,

Amanda J. Carr,

Ahmet Uysal

Abstract: Nanoscale graphene oxide (GO) thin films at the air/water interface are excellent experimental models to understand molecular-scale interactions of ions and water with GO.

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Cited by 2 publications

References 66 publications

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From Graphene Oxide to Graphene: Changes in Interfacial Water Structure and Reactivity Using Deep Neural Network Force Fields

Azom,

Milet,

David

et al. 2024

J. Phys. Chem. C

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Graphene oxides (GO) are thin graphene sheets containing oxygen-bearing defects. These sheets have a complex structure with sp 3 carbons interspersed among sp 2 carbons, which results in competition between aromatic and hydrophilic domains at the GO−water interface. The GO−water as well as neat graphene−water interfacial regions play a crucial role in various applications. While ab initio molecular dynamics simulations provide high accuracy in studying this complex region, they require significant computational resources, which limits the investigation of the interface at both time and length scales. To tackle this issue, a deep neural network force field (DNNF), trained and validated on AIMD data, was developed. It achieves DFT-level accuracy using only a fraction of the computational cost. This DNNF has been successfully used for simulating graphene oxide to reduced graphene oxide right up to fully reduced graphene−water interfaces. The ordering of water near the interface was studied as a function of oxidation level from fully oxidized graphene oxide to graphene. The vibrational sum frequency generation spectrum of the graphene−water interface was determined and compared to experimental data as well as spectra from graphene oxide−water sheets at different oxidation levels. Connections between different spectral signatures and the orientation of different waters were determined. The reactivity and buckling of the different sheets were examined. The analyses of the trajectories revealed the formation of multiple hydronium formation events with sustained proton hopping over more than a 100 ps in the fully oxidized GO−water systems.

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From Graphene Oxide to Graphene: Changes in Interfacial Water Structure and Reactivity Using Deep Neural Network Force Fields

Azom,

Milet,

David

et al. 2024

J. Phys. Chem. C

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Graphene Oxide Surface Modification of Reverse Osmosis (RO) Membrane via Langmuir–Blodgett Technique: Balancing Performance and Antifouling Properties

Petukhov,

Weston,

Valeev

et al. 2024

Membranes

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The reverse osmosis water treatment process is prone to fouling issues, prompting the exploration of various membrane modification techniques to address this challenge. The primary objective of this study was to develop a precise method for modifying the surface of reverse osmosis membranes to enhance their antifouling properties. The Langmuir–Blodgett technique was employed to transfer aminated graphene oxide films assembled at the air–liquid interface, under specific surface pressure conditions, to the polyamide surface with pre-activated carboxylic groups. The microstructure and distribution of graphene oxide along the modified membrane were characterized using SEM, AFM, and Raman mapping techniques. Modification carried out at the optimal surface pressure value improved the membrane hydrophilicity and reduced the surface roughness, thereby enhancing the antifouling properties against colloidal fouling. The flux recovery ratio after modification increased from 65% to 87%, maintaining high permeability. The modified membranes exhibited superior performance compared to the unmodified membranes during long-term fouling tests. This membrane modification technique can be easily scaled using the roll-to-roll approach and requires minimal consumption of the modifier used.

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A simple method for floating graphene oxide films facilitates nanoscale investigations of ion and water adsorption

Abstract: Nanoscale graphene oxide (GO) thin films at the air/water interface are excellent experimental models to understand molecular-scale interactions of ions and water with GO.

Cited by 2 publications

References 66 publications

From Graphene Oxide to Graphene: Changes in Interfacial Water Structure and Reactivity Using Deep Neural Network Force Fields

From Graphene Oxide to Graphene: Changes in Interfacial Water Structure and Reactivity Using Deep Neural Network Force Fields

Graphene Oxide Surface Modification of Reverse Osmosis (RO) Membrane via Langmuir–Blodgett Technique: Balancing Performance and Antifouling Properties

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