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Bio-Inspired Graphene-Derived Membranes with Strain-Controlled Interlayer Spacing

Abstract

Precisely controlled size of nanoscale fluidic channels plays a critical role in resolving the permeation-selectivity trade-off in separation and filtration applications, where highly efficient gas separation and water desalination are targeted. Inspired by natural nacre where the spacing between mineral platelets changes upon tension as fractured mineral bridges climbing over each other, bio-inspired graphene-derived membranes with sheets cross-linked by aligned covalent bonds are proposed in design, to endow a controlled interlayer spacing ranging from 4 Å to 14 Å while preserving structural and mechanical stabilities by prohibiting swelling. The underlying mechanism is that tension applied to the membrane is transferred between finite-sized graphene sheets through interlayer shear of the cross-links, which expands the interlayer gallery. First-principles calculations and continuum mechanics based model analysis are combined to explore the feasibility of this protocol, by considering the microstructures of graphene-derived membranes that have recently been demonstrated to offer exceptional performance in selective mass transport. The results show that the critical size range, 6-12 Å, in molecular sieving is covered by this synergetic interface- and strain-engineering approach.

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Publication details

The article was received on 02 Jan 2018, accepted on 28 Mar 2018 and first published on 29 Mar 2018


Article type: Paper
DOI: 10.1039/C8NR00013A
Citation: Nanoscale, 2018, Accepted Manuscript
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    Bio-Inspired Graphene-Derived Membranes with Strain-Controlled Interlayer Spacing

    E. Gao and Z. Xu, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR00013A

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