Molecular Layer‐by‐Layer Assembled Thin‐Film Composite Membranes for Water Desalination

Gu, Joung Eun; Lee, Seunghye; Stafford, Christopher M.; Lee, Jong Suk; Choi, Wansuk; Kim, Bo Young; Baek, Kyung Youl; Chan, Edwin P.; Chung, Jun Young; Bang, Joona; Lee, Jung Hyun

doi:10.1002/adma.201302030

Cited by 280 publications

(202 citation statements)

References 17 publications

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“…The amine enriched positively charged interlayer become carboxyl terminated negatively charged after sufficient reaction with TMC and hydrolysis of acyl chloride groups. Moreover, the sufficient reaction of TMC and amine groups in the interlayer increases the hydraulic resistance which lead to the dramatic decrease of PWP from 8.7 to 3.8 L m À 2 h À 1 bar À 1 [47]. These results not only further demonstrate the existence of the positively charged interlayer but also reveal its role in the desalination process.…”

Section: Transport and Separation Mechanismsupporting

confidence: 52%

Nanofiltration membranes with dually charged composite layer exhibiting super-high multivalent-salt rejection

Liu

Wang

et al. 2016

Journal of Membrane Science

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a b s t r a c tState-of-the-art nanofiltration (NF) membranes generally positively or negatively charged could not remove both multivalent cations and anions once and for all according to the Donnan Exclusion. Designing NF membranes with facile approach for effective removal of multivalent-salt without compromising the permeation is still a tough challenge. In this work, we demonstrate a sort of novel NF membrane consists of a positively charged interlayer sandwiched between substrate and negatively charged outermost surface. The restructured NF membranes with dually charged composite layer were fabricated via amination-interfacial polymerization (A-IP) on poly (vinyl chloride) (PVC) substrate. The resultant NF membranes exhibited super high salts rejection of up to 99.0% MgCl 2 , 99.0% MgSO 4 , 98.5% CaCl 2 , 95.7% Pb(NO 3 ) 2 , and 96.0% Na 2 SO 4 . Additionally, reasonably high flux (8.7 L m À 2 h À 1 bar À 1 , (pure water permeability (PWP))) approaching those of commercial NF membranes was obtained due to the relatively loose structure of the composite layer. Furthermore, the transport and separation mechanism of the restructured NF membranes reveals that the significant upgraded separation performance could be attributed to the synergistic effect of the dually charged layer. Moreover, the dually charged composite layer shown none unfavorable interaction and the resultant NF membranes possessed good interfacial stability.

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Section: Transport and Separation Mechanismsupporting

confidence: 52%

Nanofiltration membranes with dually charged composite layer exhibiting super-high multivalent-salt rejection

Liu

Wang

et al. 2016

Journal of Membrane Science

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“…In an effort to control these properties, molecular layer‐by‐layer (mLbL) was developed as an alternative and improved fabrication technique with tailored thickness, polymer network structure, and surface roughness . These results demonstrate that mLbL is able to fabricate various polyamide‐based reverse osmosis membranes with deconvoluted intrinsic and extrinsic properties.…”

Section: Introductionmentioning

confidence: 99%

Thickness‐dependent swelling of molecular layer‐by‐layer polyamide nanomembranes

Chan

Lee

2017

J Polym Sci B Polym Phys

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The thickness‐dependent water vapor swelling of molecular layer‐by‐layer polyamide films is studied via specular X‐ray reflectivity. The maximum swelling ratio of these ultrathin films scale inversely with thickness but more importantly show a dual‐mode sorption behavior characterized by Langmuir‐like sorption at low relative humidity and network swelling at high relative humidity. The thickness‐dependent network parameters are extracted using a proposed model that builds on Painter‐Shenoy network swelling model while taking into account the glass‐like characteristic below a critical swelling ratio, which also scales inversely with thickness. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017, 55, 412–417

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“…Thin polymer layers are prevalent in many membrane technologies where enhanced permselectivity is required for separating multicomponent species. These applications include membranes for batteries, fuel cells, gas separation, and water purification . These examples illustrate the critical role the polymer structure plays in determining the membrane's permselectivity.…”

Section: Introductionmentioning

confidence: 99%

Swelling of Ultrathin Molecular Layer‐by‐Layer Polyamide Water Desalination Membranes

Chan

Young

Lee

et al. 2013

J Polym Sci B Polym Phys

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The water vapor swelling behavior of ultrathin crosslinked aromatic polyamide (PA) films, synthesized via molecular layer‐by‐layer deposition, is characterized via specular X‐ray reflectivity. The results show that these films expand only along the thickness direction and their maximum swelling ratio can be controlled by the specific diamine monomer chemistry. By measuring the swelling ratio as a function of water activity, the Flory interaction parameter and monomers between crosslinks of these PAs are characterized using the Flory‐Rehner and the Painter‐Shenoy thermodynamic swelling models. Comparing the monomers between crosslink calculated from the swelling theories with values obtain from chemical analysis indicate that the PS model gives a more accurate description of the PA networks. This suggests that these low functionality but highly crosslinked networks swell via a combination of chain expansion and topological rearrangement. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2013, 51, 1647–1655

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Molecular Layer‐by‐Layer Assembled Thin‐Film Composite Membranes for Water Desalination

Cited by 280 publications

References 17 publications

Nanofiltration membranes with dually charged composite layer exhibiting super-high multivalent-salt rejection

Nanofiltration membranes with dually charged composite layer exhibiting super-high multivalent-salt rejection

Thickness‐dependent swelling of molecular layer‐by‐layer polyamide nanomembranes

Swelling of Ultrathin Molecular Layer‐by‐Layer Polyamide Water Desalination Membranes

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