Liquid-phase water isotope separation using graphene-oxide membranes

Ching, Karin; Baker, Andy; Tanaka, Ryoji; Zhao, Tingwen; Su, Zhen; Ruoff, Rodney S.; Zhao, Chuan; Chen, Xianjue

doi:10.1016/j.carbon.2021.10.009

Cited by 20 publications

(6 citation statements)

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“…For example, our work might contribute to the understanding of the lateral transport of water and heavy water through graphene oxide membranes and their selective permeation, which may be employed for water filtering. 38,39 Furthermore, similar phenomena can be expected for other proton-selective 2D materials like hexagonal boron nitride.…”

Section: Nanosupporting

confidence: 67%

At Least 10-fold Higher Lubricity of Molecularly Thin D₂O vs H₂O Films at Single-Layer Graphene–Mica Interfaces

et al. 2022

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Interfacial water is a widespread lubricant down to the nanometer scale. We investigate the lubricities of molecularly thin H2O and D2O films confined between mica and graphene, via the relaxation of initially applied strain in graphene employing Raman spectroscopy. Surprisingly, the D2O films are at least 1 order of magnitude more lubricant than H2O films, despite the similar bulk viscosities of the two liquids. We propose a mechanism based on the known selective permeation of protons vs deuterons through graphene. Permeated protons and left behind hydroxides may form ion pairs clamping across the graphene sheet and thereby hindering the graphene from sliding on the water layer. This explains the lower lubricity but also the hindering diffusivity of the water layer, which yields a high effective viscosity in accordance with findings in dewetting experiments. Our work elucidates an unexpected effect and provides clues to the behavior of graphene on hydrous surfaces.

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Section: Nanosupporting

confidence: 67%

At Least 10-fold Higher Lubricity of Molecularly Thin D₂O vs H₂O Films at Single-Layer Graphene–Mica Interfaces

et al. 2022

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“…Indeed, recent studies demonstrated that GO membranes can be used for isotopic water separations. 26,27 The high quality films prepared in this study allow one to observe clear differences between the interactions of D2O and H2O with GO, which provides new opportunities to understand the fundamental interactions underlying isotopic water selectivity of GO. ions on GO films with different structures.…”

mentioning

confidence: 93%

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

Kumal

Carr

Uysal

2022

Preprint

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Graphene oxide (GO) is a promising material for separations. Nanoscale GO thin films at the air/water interface are excellent experimental models to understand molecular-scale interactions of ions and water with GO. However, thin film formation strongly depends on how the GO was processed. This paper reports a simple, reliable, and quick method of preparing ultra-thin GO films, irrespective of their origin. This method allows the quantitative investigation of differences in film structure, ion adsorption, and interfacial water behavior with multiple surface sensitive probes. The data show that functional groups and oxidative debris vary significantly between different commercially available GO samples. These differences strongly affect ion adsorption and interfacial water behavior near GO, which are vital properties in separation applications. The results demonstrate the importance of the GO process conditions and provide experimental methods to quantify molecular-scale differences between different GO films.

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“…Indeed, recent studies demonstrated that GO membranes can be used for isotopic water separations. 58,59 The high-quality lms prepared in this study allow one to observe clear differences between the interactions of D 2 O and H 2 O with GO, which provides new opportunities to understand the fundamental interactions underlying isotopic water selectivity of GO.…”

Section: Resultsmentioning

confidence: 96%

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

Kumal,

Carr,

Uysal

2024

RSC Adv.

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Liquid-phase water isotope separation using graphene-oxide membranes

Cited by 20 publications

References 50 publications

At Least 10-fold Higher Lubricity of Molecularly Thin D₂O vs H₂O Films at Single-Layer Graphene–Mica Interfaces

At Least 10-fold Higher Lubricity of Molecularly Thin D₂O vs H₂O Films at Single-Layer Graphene–Mica Interfaces

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

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

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Liquid-phase water isotope separation using graphene-oxide membranes

Cited by 20 publications

References 50 publications

At Least 10-fold Higher Lubricity of Molecularly Thin D2O vs H2O Films at Single-Layer Graphene–Mica Interfaces

At Least 10-fold Higher Lubricity of Molecularly Thin D2O vs H2O Films at Single-Layer Graphene–Mica Interfaces

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

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

Contact Info

Product

Resources

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At Least 10-fold Higher Lubricity of Molecularly Thin D₂O vs H₂O Films at Single-Layer Graphene–Mica Interfaces

At Least 10-fold Higher Lubricity of Molecularly Thin D₂O vs H₂O Films at Single-Layer Graphene–Mica Interfaces