Large-area graphene-based nanofiltration membranes by shear alignment of discotic nematic liquid crystals of graphene oxide

Abozar Akbarivakilabadi, Phillip Andrew Sheath, Samuel Martin, Dhanraj B Shinde, Mahdokht Shaibani, Parama Chakraborty Banerjee, Rachel Tkacz, Dibakar Bhattacharyya, Mainak Majumder

Research output: Contribution to journalArticleResearchpeer-review

304 Citations (Scopus)

Abstract

Graphene-based membranes demonstrating ultrafast water transport, precise molecular sieving of gas and solvated molecules shows great promise as novel separation platforms; however, scale-up of these membranes to large-areas remains an unresolved problem. Here we demonstrate that the discotic nematic phase of graphene oxide (GO) can be shear aligned to form highly ordered, continuous, thin films of multi-layered GO on a support membrane by an industrially adaptable method to produce large-area membranes (13x14 cm2) in <5 s. Pressure driven transport data demonstrate high retention (>90%) for charged and uncharged organic probe molecules with a hydrated radius above 5Å as well as modest (30–40%) retention of monovalent and divalent salts. The highly ordered graphene sheets in the plane of the membrane make organized channels and enhance the permeability (71±5lm-2 hr-1 bar-1 for 150±15 nm thick membranes).
Original languageEnglish
Article number10891
Pages (from-to)1 - 12
Number of pages12
JournalNature Communications
Volume7
DOIs
Publication statusPublished - 7 Mar 2016

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