One-Step Transformation from Hierarchical-Structured Superhydrophilic NF Membrane into Superhydrophobic OSN Membrane with Improved Antifouling Effect

Guo, Honglian; Ma, Yu; Qin, Zhenping; Gu, Zhaoxiang; Cui, Suping; Zhang, Guojun

doi:10.1021/acsami.6b07106

Cited by 54 publications

(17 citation statements)

References 48 publications

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“…The filtration performance of the flat‐sheet and hollow‐fiber porous PTFE membrane was evaluated by a cross‐flow filtration system as described in our previous works . The effective area of the flat‐sheet membrane in the cell was 28.26 cm 2 , and that of the hollow fiber in a module was 9.42 cm 2 .…”

Section: Methodsmentioning

confidence: 99%

“…The antifouling property of the membrane was investigated using 100.0 mg L −1 of HA aqueous solution as feed liquid. The cleanability, manifested by the flux recovery ratio ( FRR ), was characterized by comparison of the flux change after cleaning and before fouling according to our previously reported method . Specifically, the pure water flux ( J w1 ) was first measured at 0.1 MPa for 2 h operation.…”

Section: Methodsmentioning

confidence: 99%

“…The pure water flux of the cleaned membrane ( J w2 ) was measured again. The antifouling property of the membrane was assessed and calculated by the FRR :

true FRR = (\frac{J_{w 2}}{J_{w 1}}) \times 100 %

…”

Section: Methodsmentioning

confidence: 99%

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Modification of a Poly(tetrafluoroethylene) Porous Membrane to Superhydrophilicity with Improved Durability

et al. 2019

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The commercial fluorocarbon surfactant (FCS) DuPont Zonyl 321 fluorinated cationic surfactants, was employed to modify both flat-sheet and hollow-fiber poly(tetrafluoroethylene) (PTFE) porous membranes. The variation of morphology, wettability, and hydrophilicity durability to acid and alkali as well as the filtration performance of both membranes were investigated. Such superhydrophilic membranes showed better wetting stability and higher resistance to acid and alkali solutions. Moreover, both membranes exhibited good filtration performance.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Modification of a Poly(tetrafluoroethylene) Porous Membrane to Superhydrophilicity with Improved Durability

et al. 2019

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“…Therefore, these membranes typically have low solvent permeability. Their performance has been improved by many strategies, including crosslinking, developing new and improved fabrication processes, membrane modification, and fabricating nanocomposite and mixed matrix membranes . Lately, research on SRNF membranes has focused on fabricating membranes from completely new materials such as graphene and other carbon materials, metal hydroxides, and metal–organic framework membranes, or from new polymers .…”

Section: Introductionmentioning

confidence: 99%

Thin‐Film Composite Polyionic Liquid Gel Membranes and Their Potential for Nanofiltration in Organic Solvents

Alkharabsheh

Bernstein

2018

Adv Materials Inter

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processes, [13][14][15][16] membrane modification, [17] and fabricating nanocomposite and mixed matrix membranes. [1,[18][19][20][21][22][23] Lately, research on SRNF membranes has focused on fabricating membranes from completely new materials such as graphene and other carbon materials, [24][25][26] metal hydroxides, [27] and metal-organic framework membranes, [28,29] or from new polymers. [30][31][32][33][34] One very promising group of materials for SRNF TFC membranes is polyelectrolyte (PE). PE-based SRNF membranes fabricated by layer-by-layer deposition or coating techniques [35][36][37] showed promising high selectivities, however, their permeabilities were low. [38] The low solubility of PEs in organic solvents due to charge condensation as well as thick active layers were probably the two main reasons for the low permeabilities. [39] Reducing the active layer thickness by decreasing the number of layers improved the permeability, but also reduced the selectivity. [38] Other approaches to increasing the permeability of PE-based membranes included incorporating graphene oxide nanosheets into the PE, [40] fabricating an ionically crosslinked asymmetric PE membrane, [41] using a weak PE [42] and a branched PE. [38] A promising new type of PE for fabricating SRNF TFC membranes which is yet to be explored is polymeric ionic liquids (PILs). PILs are solid, strong PEs that carry an ionic liquid species (cationic or anionic) constrained to the repeating units in the PE chain. [43] Unlike traditional PEs, in organic solvents PILs can swell and their counterion is delocalized, depending on the polymer and counterion types, mainly due to the hydrophobic character of the counterion and the reduced Coulombic interactions. [43,44] The swelling of the active layer in solvents is an important parameter that influences the membrane performance, that is, permeance and selectivity. [35] Low membrane permeance can be attributed to low swelling of the active layer, [45,46] but high swelling results in low selectivity or low membrane stability, [38,47,48] hence, the swelling degree of PILbased membranes must be restricted. This can be achieved by the addition of a cross-linker monomer (i.e., PIL gel) and by the choice of the PIL monomer and counterion. [49,50] Membrane permeance is also proportional to the active layer thickness: high permeability requires a thin active layer. [14,38] The selectivity of crosslinked PE-based nanofiltration membranes is proportional to the surface charge and the membrane molecular weight cutoff, namely, the cross-linker density. [35,38] The Polymeric ionic liquid (PIL) gels can serve as a promising material for the fabrication of solvent resistance nanofiltration (SRNF) membranes, given the solubility and the high delocalization of the counterion of PILs in organic solvents. This research describes the fabrication of a new thin-film composite membrane (TFC) with a crosslinked PIL (i.e., PIL gel) as an active layer and demonstrates its great potential as an SRNF membrane. A hydrophobic and positiv...

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“…As a simple and powerful technique for deposition of multifunctional thin films, LbL assembly has been widely studied over the past few decades . These multilayered and typically ionically bonded materials have achieved superior properties including super gas barrier, energy storage and conversion, flame resistance, antifouling surfaces, and drug delivery . The self‐healing behavior of LbL‐assembled films is well known .…”

Section: Introductionmentioning

confidence: 99%

Fast Self‐Healing of Polyelectrolyte Multilayer Nanocoating and Restoration of Super Oxygen Barrier

Song

Meyers

Gerringer

et al. 2017

Macromol. Rapid Commun.

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A self-healable gas barrier nanocoating, which is fabricated by alternate deposition of polyethyleneimine (PEI) and polyacrylic acid (PAA) polyelectrolytes, is demonstrated in this study. This multilayer film, with high elastic modulus, high glass transition temperature, and small free volume, has been shown to be a super oxygen gas barrier. An 8-bilayer PEI/PAA multilayer assembly (≈700 nm thick) exhibits an oxygen transmission rate (OTR) undetectable to commercial instrumentation (<0.005 cc (m d atm )). The barrier property of PEI/PAA nanocoating is lost after a moderate amount of stretching due to its rigidity, which is then completely restored after high humidity exposure, therefore achieving a healing efficiency of 100%. The OTR of the multilayer nanocoating remains below the detection limit after ten stretching-healing cycles, which proves this healing process to be highly robust. The high oxygen barrier and self-healing behavior of this polymer multilayer nanocoating makes it ideal for packaging (food, electronics, and pharmaceutical) and gas separation applications.

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One-Step Transformation from Hierarchical-Structured Superhydrophilic NF Membrane into Superhydrophobic OSN Membrane with Improved Antifouling Effect

Cited by 54 publications

References 48 publications

Modification of a Poly(tetrafluoroethylene) Porous Membrane to Superhydrophilicity with Improved Durability

Modification of a Poly(tetrafluoroethylene) Porous Membrane to Superhydrophilicity with Improved Durability

Thin‐Film Composite Polyionic Liquid Gel Membranes and Their Potential for Nanofiltration in Organic Solvents

Fast Self‐Healing of Polyelectrolyte Multilayer Nanocoating and Restoration of Super Oxygen Barrier

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