Light‐Responsive Polymer Membranes

Pantuso, Elvira; Filpo, Giovanni De; Nicoletta, Fiore Pasquale

doi:10.1002/adom.201900252

Cited by 49 publications

(38 citation statements)

References 372 publications

(399 reference statements)

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“…Finally, compounds 1 and 2 reacted in tetrahydrofuran and triethylamine to give the salt of SulfAzo. After ion-exchange on Amberlite IR 120 (acidic form) the photo-switchable sulfonic acid (SulfAzo) was obtained pure as confirmed with 1 H-NMR and 13 C-NMR (Figures S3 and S4, Supporting Information).…”

Section: Design and Characterization Of Sulfazo Wedge-shaped Monomermentioning

confidence: 68%

“…The integration of molecular photo-switches in membranes is a promising way to control separation processes with such a versatile stimulus as light. [13] The photo-induced changes in pore size and polarity in nanoporous materials permit a change in size-selective absorption. [14][15][16][17] Therefore, photo-responsive membranes can be used to control the permeation and molecular separation in gas and liquid mixtures.…”

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confidence: 99%

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Photo‐Responsive Water Filtration Membranes Based on Polymerizable Columnar Liquid Crystals with Azo Moieties

Román

Sijbesma

2022

Adv Materials Inter

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New materials developed in the last years promise to contribute significantly to the preparation of membranes with improved performance in water filtration. Specifically, the use of dynamic‐responsive systems provides reversibility of the membrane properties. In this work, a reversible photo‐switchable membrane based on templated liquid crystals is presented. Crosslinking of a columnar network, formed by the self‐assembly of a discotic supramolecular complex with a photo‐responsive moiety, results in a switchable filtration membrane. The azo groups in the membrane undergo a photoinduced trans‐cis isomerization by irradiation with 365 nm light and relax back to the cis isomer with a lifetime of 5.7 h or within a few minutes by irradiation at 455 nm. The membranes have a light‐induced reversible change in the water permeability and molecular weight cut off of poly (ethylene glycol). The effective pore size of the trans isomer (1.2 nm) increases to 1.4 nm for the cis isomer. Rejection of the organic dye Rhodamine B is reversibly switched between 50 and 85% by alternating irradiation at 365 nm and 455 nm. The reversible and specific switching demonstrates the potential of this system for light‐controlled separation in nanoporous membranes.

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Section: Design and Characterization Of Sulfazo Wedge-shaped Monomermentioning

confidence: 68%

mentioning

confidence: 99%

Photo‐Responsive Water Filtration Membranes Based on Polymerizable Columnar Liquid Crystals with Azo Moieties

Román

Sijbesma

2022

Adv Materials Inter

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“…Therefore, the development of innovative methods for controlling membrane surface structure and preparing self‐cleaning membranes would be highly valuable. [ 23,24 ] Self‐cleaning membranes responding to environmental stimuli such as magnetic fields, [ 25 ] temperature fluctuations, [ 26 ] and light [ 27,28 ] can cause changes in water flux and surface characteristics. Among the various stimulus‐responsive materials, photocatalytic materials have attracted considerable attention; [ 29–31 ] and TiO 2 is of particular interest because of its high catalytic activity, good chemical stability, low cost, and low toxicity.…”

Section: Methodsmentioning

confidence: 99%

Electrospinning Oriented Self‐Cleaning Porous Crosslinking Polymer for Efficient Dyes Removal

Chen

et al. 2020

Adv Materials Inter

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used to selectively separate molecules on the basis of their electrical properties or shapes. [8-10] The topological morphology of the interfacial polymerization substrate is very important for the construction of supramolecular crosslinking polymers. We believe that the combination of interfacial polymerization [11,12] and electrospinning technology [13] could be a good universal method for preparing composite nanofiltration membranes, the structures and properties of which can be controlled by means of surface modification, [14] adjustment of the electrospinning parameters, [15] and the addition of functional nanoparticles to the spinning solution. Membrane separation technology is now widely used in pollutant treatment. [16-18] However, contamination of porous membrane surfaces is a bottleneck that prevents even wider use of this technology. [19-22] After dye-containing wastewater is filtered, membranes are generally recycled by washing with organic solvents, but this process generates dye-containing organic solvent waste. If this new waste is not handled properly, the dissolved dyes can re-enter the environment and cause secondary pollution. Therefore, the development of innovative methods for controlling membrane surface structure and preparing self-cleaning membranes would be highly valuable. [23,24] Self-cleaning membranes responding to environmental stimuli such as magnetic fields, [25] temperature fluctuations, [26] and light [27,28] can cause changes in water flux and surface characteristics. Among the various stimulusresponsive materials, photocatalytic materials have attracted considerable attention; [29-31] and TiO 2 is of particular interest because of its high catalytic activity, good chemical stability, low cost, and low toxicity. [32,33] In the current study, we interfacially polymerized β-cyclodextrin and four crosslinking agents on polyacrylonitrile (PAN) electrospun nanofibrous substrates with different morphologies (depending on the PAN concentration and the spinning orientation), and we investigated the utility of the resulting composite membranes for dye removal from aqueous solution. If TiO 2 was incorporated in the PAN electrospun nanofibrous substrate, UV irradiation of the used composite membranes efficiently degraded the adsorbed dye, rendering the composite membranes self-cleaning and thus reusable (Scheme 1). First, electrospinning technology was used to fabricate nanofibrous PAN and PAN/TiO 2 membranes with controlled fiber diameter and morphology. Then, β-cyclodextrin and The separation of harmful substances by supramolecular crosslinking polymers is the focus of current research. As far as it is known, supramolecular crosslinking systems based on electrospun nanofibers are rarely reported. However, electrospun nanofibers should be promising candidates for interfacial crosslinking substrates because of their adjustable morphology and can be doped with different functional nanoparticles. In this study, β-cyclodextrin and acyl chloride compounds are interfacially polymerized on polya...

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“…Such molecules include azobenzene (Azo), spiropyran, diarylethene, triphenylmethane, fulgide, overcrowed alkene, stilbene, thiophenefulgide, anthracene, cinnamic acid, coumarin, and thymine. 127 Vinyl spiropyran monomer was grafted onto a poly(ether sulfone) [P(ES)] membrane by using a UV-induced graft method. 124 The spiropyran contained a serial of lightswitchable photochromic monomers that were white, nonpolar and in a "closed form" in the Vis-light.…”

Section: Protocols For Creating Sr-ppmecsmentioning

confidence: 99%

Design of Switchable Enzyme Carriers Based on Stimuli-Responsive Porous Polymer Membranes for Bioapplications

Qiao

2021

ACS Appl. Bio Mater.

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Design of efficient enzyme carriers, where enzymes are conjugated to supports, has become an attractive research avenue. Immobilized enzymes are advantageous for practical applications because of their convenience in handling, ease of separation, and good reusability. However, the main challenge is that these traditional enzyme carriers are unable to regulate the enzymolysis efficiency or to protect the enzymes from proteolytic degradation, which restricts their effectiveness of enzymes in bioapplications. Enlightened by the stimuli-responsive channels in the natural cell membranes, conjugation of the enzymes within flat-sheet stimuli-responsive porous polymer membranes (SR-PPMs) as artificial cell membranes is an efficient strategy for circumventing this challenge. Controlled by the external stimuli, the multifunctional polymer chains, which are incorporated within the membranes and attached to the enzyme, change their structures to defend the enzyme from the external environmental disturbances and degradation by proteinases. Specifically, smart SR-PPM enzyme carriers (SR-PPMECs) not only permit convective substrate transfer through the accessible porous network, dramatically improving enzymolysis efficiency due to the adjustable pore sizes and the confinement effect, but they also act as molecular switches for regulating its permeability and selectivity. In this review, the concept of SR-PPMECs is presented. It covers the latest developments in design strategies of flat-sheet SR-PPFMs, fabrication protocols of SR-PPFMECs, strategies for the regulation of enzymolysis efficiency, and their cutting-edge bioapplications.

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Light‐Responsive Polymer Membranes

Cited by 49 publications

References 372 publications

Photo‐Responsive Water Filtration Membranes Based on Polymerizable Columnar Liquid Crystals with Azo Moieties

Photo‐Responsive Water Filtration Membranes Based on Polymerizable Columnar Liquid Crystals with Azo Moieties

Electrospinning Oriented Self‐Cleaning Porous Crosslinking Polymer for Efficient Dyes Removal

Design of Switchable Enzyme Carriers Based on Stimuli-Responsive Porous Polymer Membranes for Bioapplications

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