Etching gas-sieving nanopores in single-layer graphene with an angstrom precision for high-performance gas mixture separation

Zhao, Jing; He, Guangwei; Huang, Shiqi; Villalobos, Luis Francisco; Dakhchoune, Mostapha; Bassas, H.; Agrawal, Kumar Varoon

doi:10.1126/sciadv.aav1851

Cited by 174 publications

(189 citation statements)

References 51 publications

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“…Considering its ultrathin layer, this porous structure is in theory the ultimate combination of permeability and selectivity . However, the difficulty of creating high density of pores with uniform size and shape on nanosheets hinders the large‐area synthesis of NATMs and retards their practical applications at the moment . The other category is 2D laminar membranes, which are composed of layers of nanosheets piling over each other to form a parallel‐stacked structure.…”

Section: Introductionmentioning

confidence: 86%

2D Laminar Membranes for Selective Water and Ion Transport

Kang

Xia

Wang

et al. 2019

Adv Funct Materials

256

148

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energy storage and conversion devices, [26][27][28] as outlined in recent reviews (Figure 1, left). [29] Behind these applications lie a fundamental question: how water and ion transport are controlled in the laminar structure to obtain desired selectivity. A comprehensive summary of structure-transport relation is thereby imperative to understand and optimize membrane selective performance, but is so far lacking. In such context, our review aims to fill this gap by discussing: 1) how 2D materials with specific physicochemical features are assembled into laminar membranes; 2) most importantly, how membrane structure, and its response to external impacts, can tune mass transport (herein, water and ions); 3) how these transport mechanisms translate into selectivity in applications, and into future design of high-performance laminar membranes. Unsolved problems and emerging challenges around these topics are then concluded. We note that the knowledge summarized here can also, at least partly, assist the understanding of the selective gas, liquid, and micromolecule transport through laminar membranes, which are gaining considerable attention as well. [30][31][32] Transition Metal Carbides and/or Nitrides (MXene): MXene nanosheets are etched and delaminated from parent bulk MAX to M n+1 X n T x (e.g., Ti 3 C 2 T x ), and have thus several atom sublayers. [39] While M and X are early transition metal

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Section: Introductionmentioning

confidence: 86%

2D Laminar Membranes for Selective Water and Ion Transport

Kang

Xia

Wang

et al. 2019

Adv Funct Materials

256

148

View full text Add to dashboard Cite

show abstract

“…3c, d). In a recent report, 65 this team further increased the pore density to 2.1 × 10 12 cm −2 by consecutive O 2 plasma and O 3 exposures which resulted a record-high mixed-gas separation performance (Separation factor for H 2 /CH 4 = 15.6 to 25.1 and for H 2 /C 3 H 8 = 38.0 to 57.8).…”

Section: Monolayered Graphene Membranesmentioning

confidence: 99%

Combining Silk Sericin and Surface Micropatterns in Bacterial Cellulose Dressings to Control Fibrosis and Enhance Wound Healing

Boni¹,

Lamboni²,

Bakadia³

et al. 2020

Eng. Sci.

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Graphene has been hailed as a revolutionary membrane material because of its many alluring features and the ease in their tunability. In specific to gas separation industry, the exceptional molecular transport, the possibility of fabricating membranes having thickness at a nanoscale range and the robust lattice structure that can withstand to the rigorous perforation methods render graphene to stand ahead of its contemporary materials. Moreover, its broad chemical tolerance and high mechanical strength facilitate the mass-production of membranes possessing macroscopic dimensions and their subsequent long-term operation under harsh environments. In this concise review, we complied and discussed the progress of gas-separation performance of graphene-based membranes with a prime focus on recent advancements in scalability, functionalization/modification along with the new manufacturing processes including the budding approaches through synthetic chemistry. The strategies implemented, the factors that influenced the membranes'performance and the corresponding transport mechanisms were highlighted in detail. In the end, we outlined the daunting challenges facing by these graphene-based membranes in realization of their prospects as well as the proposed measures for alleviating them.

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“…To achieve these advantages, developing high-performance organic solvent nanofiltration (OSN) membranes is deemed a strategic area of focus. Recently, membrane-selective skin layers enabled by two-dimensional graphene-based materials appear promising, as single-layer graphene has the lowest possible transport resistance, given its monoatomic thickness (6,7). In addition, graphene oxide (GO) nanosheets are highly solution processable, allowing them to be readily fabricated into laminated membranes with low-friction surface networks.…”

Section: Introductionmentioning

confidence: 99%

Realizing small-flake graphene oxide membranes for ultrafast size-dependent organic solvent nanofiltration

et al. 2020

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Membranes for organic solvent nanofiltration (OSN) or solvent-resistant nanofiltration (SRNF) offer unprecedented opportunities for highly efficient and cost-competitive solvent recovery in the pharmaceutical industry. Here, we describe small-flake graphene oxide (SFGO) membranes for high-performance OSN applications. Our strategy exploits lateral dimension control to engineer shorter and less tortuous transport pathways for solvent molecules. By using La3+ as a cross-linker and spacer for intercalation, the SFGO membrane selective layer was stabilized, and size-dependent ultrafast selective molecular transport was achieved. The methanol permeance was up to 2.9-fold higher than its large-flake GO (LFGO) counterpart, with high selectivity toward three organic dyes. More importantly, the SFGO-La3+ membrane demonstrated robust stability for at least 24 hours under hydrodynamic stresses that are representative of realistic OSN operating conditions. These desirable attributes stem from the La3+ cross-linking, which forms uniquely strong coordination bonds with oxygen-containing functional groups of SFGO. Other cations were found to be ineffective.

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Etching gas-sieving nanopores in single-layer graphene with an angstrom precision for high-performance gas mixture separation

Abstract: High-density nanopores with a size resolution of 1 Å were etched on graphene by decoupled defect nucleation and pore expansion.

Cited by 174 publications

References 51 publications

2D Laminar Membranes for Selective Water and Ion Transport

2D Laminar Membranes for Selective Water and Ion Transport

Combining Silk Sericin and Surface Micropatterns in Bacterial Cellulose Dressings to Control Fibrosis and Enhance Wound Healing

Realizing small-flake graphene oxide membranes for ultrafast size-dependent organic solvent nanofiltration

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