Polyelectrolyte layer-by-layer self-assembly enhanced by electric field and their multilayer membranes for separating isopropanol–water mixtures

Fabrication of ultrahigh hydrogen barrier polyethyleneimine/graphene oxide films by LBL assembly fine-tuned with electric field application

“…The H 2 TR of the film decreased gradually with increasing immersion time, regardless whether an applied electric field was used. After an 14 immersion time of 15 min, the H2TR stabilized, which was consistent with the equilibrium adsorption time of the self-assembly process [29,32] . Therefore, the hydrogen barrier properties of the composite films prepared under an applied electric field significantly improved compared with the composite films prepared without an electric field.…”

“…Studies focusing on polyelectrolyte LBL self-assembled films on non-conductive substrates are uncommon despite the wide applications of this type of film. Zhang et al [32] found that in a system of 90 wt % isopropanol/water at 70 °C, a polyethylenimine/poly(acylic acid sodium salt) composite film prepared on a reverse osmosis membrane substrate under an electric field showed a pervaporation separation factor of 1075 and permeation flux of up to 4.05 kg/m 2 ·h. Zhang et al [33] have also 8 studied the pervaporation performance of PDDA/poly(sodium styrenesulfonate) and PEI films deposited on polyacrylonitrile film substrates via LBL assembly, as well as the self-assembly process on hard substrates, such as silicon wafers, under electric field to perform thickness measurements and microstructural analysis.…”

Fabrication of free-standing polyelectrolyte multilayer films: A method using polysulfobetaine-containing films as sacrificial layers

“…The prepared multilayer films possess much potential application in separation membranes, sensors, optical and electronic film devices, biological templates and so forth [3][4][5][6][7][8][9][10][11][12][13][14][15]. Generally, the film is tightly bound to its substrates (quartz slides, silicon wafers and supporting film, etc.).…”

The fast deposition of antireflection coating

“…Using the electric-field-directed layer-by-layer deposition, CdTe light-emitting devices that emit green and red colors 16 and two different types of enzymes 17,18 were fabricated on an indium-tin-oxide substrate. The process of the electrophoretic deposition promoted the efficiency of DNA delivery, increased the duration of the release of DNA from polyelectrolyte multilayers, 19 enhanced the pervaporation performances of polyelectrolyte multilayers for separating isopropanol-water mixtures, 20,21 and rapidly fabricated functional protein nanoarrays. 22 The adsorption of polyelectrolytes was weakened at an intermediate electric field strength because of the electrolysis of the water at the electrode surface.…”