Layer-by-layer self-assembly of polyelectrolyte complexes and their multilayer films for pervaporation dehydration of isopropanol

Highly crosslinked layer-by-layer polyelectrolyte FO membranes: Understanding effects of salt concentration and deposition time on FO performance

“…LbL is a flexible process that offers a variety of functionalized materials for a range of applications such as biosensors [13], drug delivery [14], membrane separations (e.g. pervaporation [15][16][17][18], fuel cells [19], microfiltration [20], nanofiltration [21,22], reverse osmosis [23] and forward osmosis [8][9][10][11][12]), biomedical devices [24], food packaging [25] and others [26]. In LbL polyelectrolyte fabrication process, polyelectrolyte multilayers are normally assembled by the sequential adsorption of polyanions and polycations manually or automatically via dip-coating [21,27,28], spraying [29,30] or spin-coating [31] methods through electrostatic interaction.…”

Layer-by-layer (LbL) polyelectrolyte membrane with Nexar™ polymer as a polyanion for pervaporation dehydration of ethanol

“…6 . 1 40 E Z ρ = (8 ) where ρ is the density of the polymer material in g/cm 3 . To understand the interactions between membranes and feed components, vapor sorption studies and liquid swelling tests were conducted on Nexar TM dense films at 50 ι .…”

“…Since pervaporation membranes are the heart of the pervaporation process, developing high performance pervaporation membranes is essential for the success of the pervaporation technology [7]. Owing to the simplicity of preparing ultrathin films, the electrostatic layer-by-layer (LbL) adsorption technique has gained interests for the fabrication of pervaporation membranes in recent years [8][9][10][11]. The resultant membranes are often referred to as "polyelectrolyte multilayer membranes (PEMMs)" because of the alternative deposition of oppositely charged polyelectrolytes on a charged substrate [12].…”

“…Some studies have aimed to explore new polyelectrolytes, while others have tried to simplify the fabrication process for PEMMs and improve their separation performance. Zhao et al used charged polyelectrolyte complex (PEC) colloidal nanoparticles and fabricated PEMMs with a less number of bi-layers [8]. Zhang et al prepared PAA/protonated chitosan with less than 8 bi-layers for alcohol dehydration [21].…”

Polyelectrolyte complex membranes for pervaporation, nanofiltration and fuel cell applications

“…50 nm, which is hundred times lower than that of BPECMs discussed previously. In order to figure out the effect of thickness on PV performances of multilayered PEC membranes, Zhao et al [134] prepared multilayered PEC membranes with micrometer scale thickness by using colloidal particles as building blocks. Their work showed that the flux of the multilayered PEC membranes is lower than that of solution-casted PEC membranes with similar thickness.…”