(373d) 2D Assembly of Graphene Oxide Nanoribbon Via Slot-Die Coating and Its Application for Organic Solvent Nanofiltration

Graphene Oxide Nanoribbon(GONR) is emerging material in various membrane research fields due to its excellent mechanical and chemical properties attributed to one dimensional(1D) structure with narrow width of single-layer graphene. When the GONR is dispersed in solvents, it can be used to build nanostructures from nanoplate to 3D scaffolds with increasing concentration. However, a high-aspect-ratio nanosheet made of GONR is hard to prepare, with 2D shape is better to use for coating and membrane fabrication. Herein, the slot-die coating method was used for GONR nanosheet fabrication by filtering 5 mg/mL concentration of GONR solution and the GONR nanosheets were used to prepare organic solvent nanofiltration(OSN) membrane. In the process of slot-die coating, nanoplate assembly of GONR was observed during injection through the die-head. When a 40 nm-thick GONR layer was coated on a porous polymer support, the membrane showed a high pure IPA permeance of 186 LMH/bar on dead-end filtration mode and 679 LMH/bar on cross-flow mode, both with 961 Da of molecular weight cutoff. The OSN performance is surpassing the previous polymeric and nanomaterials-based membranes and the fabrication method is scalable by the continuous slot-die coating method.

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