Graphene oxide nanoribbon hydrogel: viscoelastic behavior and use as a molecular separation membrane
- Graphene oxide nanoribbon hydrogel: viscoelastic behavior and use as a molecular separation membrane
- 김성수; 최윤규; 김지훈; 강준혁; 최은지; 최승은; 김정필; 권오찬; 김대우
- Issue Date
- ACS Nano
- VOL 14, NO 9-12202
- The preparation of carbon materials based hydrogels and their viscoelastic properties are essential for their broad application and scale-up. However, existing studies are mainly focused on graphene derivatives and carbon nanotubes, and the behavior of graphene nanoribbon (GNR), a narrow strip of graphene, remains elusive. Herein, we demonstrate the concentration-driven gelation of oxidized GNR (graphene oxide nanoribbon, GONR) in aqueous solvents. Exfoliated individual GONRs sequentially assemble into strings (∼1 mg/mL), nanoplates (∼20 mg/mL), and a macroporous scaffold (50 mg/mL) with increasing concentration. The GONR hydrogels exhibit viscoelastic shear-thinning behavior and can be shear-coated to form large-area GONR films on substrates. The entangled and stacked structure of the GONR film contributed to outstanding nanofiltration performance under high pressure, cross-flow, and long-term filtration, while the precise molecular separation with 100% rejection rate was maintained for sub-nanometer molecules.
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