A CO<sub>2</sub>-gated anodic aluminum oxide based nanocomposite membrane for de-emulsification

Huang, Xia; Mutlu, Hatice; Théato, Patrick

doi:10.1039/d0nr04248j

Cited by 14 publications

(4 citation statements)

References 45 publications

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“…The first involves the introduction of CO 2 -responsive moieties-linear polymer chains, cross-linked hydrogel networks, and microspheres-as modifiers. They are integrated into the surface or the pore walls of existing porous membranes through grafting or surface coating (22)(23)(24)(25)(26)(27). The second method involves the direct usage of CO 2 -responsive polymers as raw materials or additives during membrane formation (20,21,28,29).…”

Section: Fabrication Of Core-shell Structure Of Co 2 -Responsive Fibersmentioning

confidence: 99%

Scalable weaving of resilient membranes with on-demand superwettability for high-performance nanoemulsion separations

Wang,

Villalobos,

Liang

et al. 2024

Sci. Adv.

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This study leverages the ancient craft of weaving to prepare membranes that can effectively treat oil/water mixtures, specifically challenging nanoemulsions. Drawing inspiration from the core-shell architecture of spider silk, we have engineered fibers, the fundamental building blocks for weaving membranes, that feature a mechanically robust core for tight weaving, coupled with a CO 2 -responsive shell that allows for on-demand wettability adjustments. Tightly weaving these fibers produces membranes with ideal pores, achieving over 99.6% separation efficiency for nanoemulsions with droplets as small as 20 nm. They offer high flux rates, on-demand self-cleaning, and can switch between sieving oil and water nanodroplets through simple CO 2 /N 2 stimulation. Moreover, weaving can produce sufficiently large membranes (4800 cm 2 ) to assemble a module that exhibits long-term stability and performance, surpassing state-of-the-art technologies for nanoemulsion separations, thus making industrial application a practical reality.

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Section: Fabrication Of Core-shell Structure Of Co 2 -Responsive Fibersmentioning

confidence: 99%

Scalable weaving of resilient membranes with on-demand superwettability for high-performance nanoemulsion separations

Wang,

Villalobos,

Liang

et al. 2024

Sci. Adv.

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“…The CO 2 -responsive AAO membranes were utilized for water flux test and oil-water emulsion separation. [18] Ma et al also built up asymmetrical modified AAO membranes by SI-ATRP. Flux test and wettability of the membranes were also discussed.…”

Section: Introductionmentioning

confidence: 99%

“…fabricated CO 2 ‐responsive PDEAEMA grafted AAO membranes by sol‐gel impregnation and SI‐RAFT. The CO 2 ‐responsive AAO membranes were utilized for water flux test and oil‐water emulsion separation [18] . Ma et al.…”

Section: Introductionmentioning

confidence: 99%

Smart Temperature‐Gating and Ion Conductivity Control of Grafted Anodic Aluminum Oxide Membranes

Lee

Chen

Lee

et al. 2023

Chemistry A European J

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Over the past few decades, stimuli-responsive materials have been widely applied to porous surfaces. Permeability and conductivity control of ions confined in nanochannels modified with stimuli-responsive materials, however, have been less investigated. In this work, the permeability and conductivity control of ions confined in nanochannels of anodic aluminum oxide (AAO) templates modified with thermo-responsive poly(N-isopropylacrylamide) (PNIPAM) brushes are demonstrated. By surface-initiated atom transfer radical polymerization (SI-ATRP), PNIPAM brushes are successfully grafted onto the hexagonally packed cylindrical nanopores of AAO templates. The surface hydrophilicities of the membranes can be reversibly altered because of the lower critical solution temperature (LCST) behavior of the PNIPAM polymer brushes. From electrochemical impedance spectroscopy (EIS) analysis, the temperature-gating behaviors of the AAO-g-PNIPAM membranes exhibit larger impedance changes than those of the pure AAO membranes at higher temperatures because of the aggregation of the grafted PNIPAM chains. The reversible surface properties caused by the extended and collapsed states of the polymer chains are also demonstrated by dye release tests. The smart thermo-gated and ion-controlled nanoporous membranes are suitable for future smart membrane applications.[a] M.

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“…[1] Within this context, stimuli-responsive polymers can react to changes in their environment, for example, temperature, pH value, or other triggers, with changes in their macromolecular properties. [1][2][3][4][5][6][7] One possibility to achieve a thermally induced response focuses on a lower critical solution temperature (LCST) or an upper critical solution temperature (UCST) in a specific medium. [8][9][10][11] The different solubility of the polymer chains at different temperatures can be exploited to use, for example, polymer micelles to act as carriers for specific cargo compounds.…”

Section: Introductionmentioning

confidence: 99%

Thermo‐Responsive Ultrafiltration Block Copolymer Membranes Based on Polystyrene‐block‐poly(diethyl acrylamide)

Frieß

Hartmann

Gemmer

et al. 2023

Macro Materials & Eng

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Within the present work, a thermo‐responsive ultrafiltration membrane is manufactured based on a polystyrene‐block‐poly(diethyl acrylamide) block copolymer (BCP). The poly(diethyl acrylamide) block segment features a lower critical solution temperature (LCST) in water, similar to the well‐known poly(N‐isopropylacrylamide), but having increased biocompatibility and without exhibiting a hysteresis of the thermally induced switching behavior. The BCP is synthesized via sequential “living” anionic polymerization protocols and analyzed by 1H‐NMR spectroscopy, size exclusion chromatography, and differential scanning calorimetry. The resulting morphology in the bulk state is investigated by transmission electron microscopy (TEM) and small‐angle X‐ray scattering (SAXS) revealing the intended hexagonal cylindrical morphology. The BCPs form micelles in a binary mixture of tetrahydrofuran and dimethylformamide, where BCP composition and solvent affinities are discussed in light of the expected structure of these micelles and the resulting BCP membrane formation. The membranes are manufactured using the non‐solvent induced phase separation (NIPS) process and are characterized via scanning electron microscopy (SEM) and water permeation measurements. The latter are carried out at room temperature and at 50 °C revealing up to a 23‐fold increase of the permeance, when crossing the LCST of the poly(diethyl acrylamide) block segment in water.

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A CO₂-gated anodic aluminum oxide based nanocomposite membrane for de-emulsification

Abstract: A carbon dioxide stimuli responsive organic-inorganic nanocomposite membrane was constructed on the basis of through-hole anodic aluminum oxide (AAO) template. The composite was prepared via surface-initiated reversible addition-fragmentation chain-transfer (SI-RAFT)...

Cited by 14 publications

References 45 publications

Scalable weaving of resilient membranes with on-demand superwettability for high-performance nanoemulsion separations

Scalable weaving of resilient membranes with on-demand superwettability for high-performance nanoemulsion separations

Smart Temperature‐Gating and Ion Conductivity Control of Grafted Anodic Aluminum Oxide Membranes

Thermo‐Responsive Ultrafiltration Block Copolymer Membranes Based on Polystyrene‐block‐poly(diethyl acrylamide)

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A CO2-gated anodic aluminum oxide based nanocomposite membrane for de-emulsification

Abstract: A carbon dioxide stimuli responsive organic-inorganic nanocomposite membrane was constructed on the basis of through-hole anodic aluminum oxide (AAO) template. The composite was prepared via surface-initiated reversible addition-fragmentation chain-transfer (SI-RAFT)...

Cited by 14 publications

References 45 publications

Scalable weaving of resilient membranes with on-demand superwettability for high-performance nanoemulsion separations

Scalable weaving of resilient membranes with on-demand superwettability for high-performance nanoemulsion separations

Smart Temperature‐Gating and Ion Conductivity Control of Grafted Anodic Aluminum Oxide Membranes

Thermo‐Responsive Ultrafiltration Block Copolymer Membranes Based on Polystyrene‐block‐poly(diethyl acrylamide)

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A CO₂-gated anodic aluminum oxide based nanocomposite membrane for de-emulsification