Electric field assisted layer-by-layer assembly of graphene oxide containing nanofiltration membrane

Layer-by-Layer Assembly of Two-Dimensional Materials: Meticulous Control on the Nanoscale

“…84,85 Typically, existing membranes are used as substrates (e.g., polyacrylonitrile, polyamide), and modified using LbL assembly on their surface to improve selectivity. 86,87 In one example, the permselectivity of a commercial polyacrylonitrile ultrafiltration membrane can be improved by LbL deposition of GO and PEI. The substrate z-potential of the resultant layered composite film increased by nearly +100 mV, which was found to be beneficial for rejecting divalent cations.…”

The stability of a graphene oxide (GO) nanofiltration (NF) membrane in an aqueous environment: progress and challenges

“…86,92 Compared with incorporated nanomaterials, polymers can be better distributed on GO nanosheets, thus they can significantly decrease the disarranged laminar structure and larger interlayer spacing, achieving improved water flux and dye rejection. 92,93 Most importantly, the entanglement of polymer chains grafted on GO nanosheets can provide enough interaction to maintain the structural stability of the GO membrane in water. Xu et al reported an effective strategy to prepare highly stable GO NF membranes by intercalating ionic polymers rich in benzene and cationic imidazolium (or anionic sulfonic acid) moieties (Fig.…”

Bilayer graphene oxide membranes for a wearable hemodialyzer

“…L-b-L assembly frameworks have achieved minimum thicknesses of ~100 nm. These assemblies have demonstrated water permeabilities of ~25-60 mL/hr.mmHg.m 2 with improved retention of charged molecules compared to typical nanofiltration (NF) membranes 19,20 . However, L-b-L assemblies have largely ignored the impact of critical GO nanoplatelet physicochemical properties on the membrane transport characteristics.…”