2019
DOI: 10.1021/acsapm.9b00409
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High Flux Membranes with Ultrathin Zwitterionic Copolymer Selective Layers with ∼1 nm Pores Using an Ionic Liquid Cosolvent

Abstract: We report membranes with ultrathin <200 nm zwitterionic copolymer selective layers exhibiting ∼1 nm size cutoff and permeances as high as 50 L/m2·hr·bar. The thin layer is formed by the deposition of random zwitterionic copolymers in trifluoroethanol/ionic liquid mixtures onto a porous support. The resultant membranes have the same low molecular weight cutoff of ∼1000 Da and narrow pore size distribution but fluxes up to 10 times higher than membranes prepared without ionic liquid and 20 times higher than comm… Show more

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Cited by 15 publications
(24 citation statements)
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“…This layer thickness could potentially be further decreased by improving the coating processes, resulting in higher membrane permeances by up to 50 times, as demonstrated with other ZAC membrane chemistries. [ 52,63 ]…”
Section: Resultsmentioning
confidence: 99%
See 2 more Smart Citations
“…This layer thickness could potentially be further decreased by improving the coating processes, resulting in higher membrane permeances by up to 50 times, as demonstrated with other ZAC membrane chemistries. [ 52,63 ]…”
Section: Resultsmentioning
confidence: 99%
“…This layer thickness could potentially be further decreased by improving the coating processes, resulting in higher membrane permeances by up to 50 times, as demonstrated with other ZAC membrane chemistries. [52,63] Membrane was immersed in TFE, a solvent that readily dissolves un-cross-linked P(AM-r-SBMA). The fact that the selective layer is visually unchanged shows that cross-linking improves the solvent stability of this layer.…”
Section: Membrane Fabrication and Cross-linkingmentioning
confidence: 99%
See 1 more Smart Citation
“…This is in agreement with results from our previous study on amphiphilic copolymers containing high proportions of hydrophobic moieties. [ 10b ]…”
Section: Resultsmentioning
confidence: 99%
“…[ 3b,3c,4a,5a,9 ] Since zwitterions can impart superhydrophilicity, amphiphilic copolymers having zwitterionic moieties have been also developed. However, since many of the polymers having zwitterionic moieties have poor solubility in most of the organic solvents, [ 3a,10 ] their application in the surface coating process, the most efficient way to modify the membrane surface, [ 3c ] has been limited.…”
Section: Introductionmentioning
confidence: 99%