Precise Molecular Sieving Architectures with Janus Pathways for Both Polar and Nonpolar Molecules

Liu, Jiangtao; Hua, Ding; Zhang, Yu; Japip, Susilo

doi:10.1002/adma.201705933

Cited by 226 publications

(112 citation statements)

References 56 publications

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“…8 However, conventional polyamide membranes developed from monomers of m-phenylenediamine (MPD) and trimesoyl chloride (TMC) through interfacial polymerization (IP) are particularly unsuitable for non-polar solvents, such as n-hexane, due to their highly cross-linked chemical structure and intrinsic hydrophilicity prohibiting solvent transport. 9,10 In applications, organic solvent systems are sophisticated as they contain both polar and non-polar solvents. 4,10 Currently, most OSN membranes are only suitable for either polar or non-polar organic solvents.…”

Section: Introductionmentioning

confidence: 99%

“…9,10 In applications, organic solvent systems are sophisticated as they contain both polar and non-polar solvents. 4,10 Currently, most OSN membranes are only suitable for either polar or non-polar organic solvents. 8,[10][11][12][13] Incorporation of uorine and silicon in the polyamide top layer can effectively endow the membrane with hydrophobic properties.…”

Section: Introductionmentioning

confidence: 99%

“…4,10 Currently, most OSN membranes are only suitable for either polar or non-polar organic solvents. 8,[10][11][12][13] Incorporation of uorine and silicon in the polyamide top layer can effectively endow the membrane with hydrophobic properties. 9 However, the graing barrier layer inevitably decreases the solvent permeability due to the resulting higher resistance.…”

Section: Introductionmentioning

confidence: 99%

“…5,10-12,14-16 For example, Chung et al constructed Janus pathways with both hydrophobic and hydrophilic channels using cyclodextrins (CDs) as building blocks. 10 The hydrophobic inner cavities of CDs facilitate transport of non-polar solvent molecules and the hydrophilic outer space provides superhighways for polar solvent molecules. However, the large pore size of the CDs could only enable membrane rejection of large solute molecules.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Controllable synthesis of a chemically stable molecular sieving nanofilm for highly efficient organic solvent nanofiltration

Zhu

et al. 2020

Chem. Sci.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Controllable synthesis of a chemically stable molecular sieving nanofilm for highly efficient organic solvent nanofiltration

Zhu

et al. 2020

Chem. Sci.

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“…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 . One very promising group of materials for SRNF TFC membranes is polyelectrolyte (PE).…”

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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Emerging Functional Porous Polymeric and Carbonaceous Materials for Environmental Treatment and Energy Storage

Zheng

Lin

Zhang

et al. 2019

Adv Funct Materials

206

118

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The demand for practical and cost-effective environmental treatment and energy storage materials is exploding. Porous polymeric and carbonaceous materials have attracted tremendous interest on account of their welldeveloped porosity and tunable surface chemistry. Functionalization of pore structures further enhances their properties for environmental treatment and energy storage. Herein, the procedures for functionalization of porous structures are introduced, including predesign and postsynthetic strategies. Subsequently, the important advancements of emerging porous polymers for environmental treatment in sorption (e.g., organic micropollutant adsorption, heavy metal ion removal, radionuclide extraction, and oil absorption) and membrane separation (e.g., aqueous micropollutant separation, organic solvent nanofiltration, desalination and pervaporation), as well as for energy storage ranging from the electrodes and separators of batteries to supercapacitor electrodes are highlighted. Moreover, given the combined merits of high intrinsic conductivity, porosity, and physicochemical stability, novel polymer-based porous carbons for energy storage are also highlighted. Key functionalization chemistry for each application is discussed and an in-depth understanding of the structure-property relationships of these functional porous materials is provided. Finally, the challenges and perspectives of emerging functional porous polymeric and carbonaceous materials for environmental treatment and energy storage are proposed.

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Precise Molecular Sieving Architectures with Janus Pathways for Both Polar and Nonpolar Molecules

Cited by 226 publications

References 56 publications

Controllable synthesis of a chemically stable molecular sieving nanofilm for highly efficient organic solvent nanofiltration

Controllable synthesis of a chemically stable molecular sieving nanofilm for highly efficient organic solvent nanofiltration

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

Emerging Functional Porous Polymeric and Carbonaceous Materials for Environmental Treatment and Energy Storage

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