pH-Triggered Membrane in Pervaporation Process

Angelini, Alessandro; Fodor, Csaba; Yave, Wilfredo; Leva, Luigi; Car, Anja; Meier, Wolfgang

doi:10.1021/acsomega.8b03155

Cited by 16 publications

(11 citation statements)

References 41 publications

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“…The shift of these maxima to lower wavenumbers suggests that the N–H and C=O groups of PDMAEMA and MBA are involved in the hydrogen bond formation. The results of the FTIR analysis are in agreement with the literature data [ 40 , 41 , 42 , 43 , 44 ].…”

Section: Resultssupporting

confidence: 90%

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Cellulose-g-poly(2-(dimethylamino)ethylmethacrylate) Hydrogels: Synthesis, Characterization, Antibacterial Testing and Polymer Electrolyte Application

Blažic

Grgić

Roković

et al. 2022

Gels

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Hydrogels have been investigated due to their unique properties. These include high water content and biocompatibility. Here, hydrogels with different ratios of poly(2-(dimethylamino)ethylmethacrylate) (PDMAEMA) were grafted onto cellulose (Cel-g-PDMAEMA) by the free radical polymerization method and gamma-ray radiation was applied in order to increase crosslinking and content of PDMAEMA. Gamma irradiation enabled an increase of PDMAEMA content in hydrogels in case of higher ratio of 2-(dimethylamino)ethyl methacrylate in the initial reaction mixture. The swelling of synthesized hydrogels was monitored in dependence of pH (3, 5.5 and 10) during up to 60 days. The swelling increased from 270% to 900%. Testing of antimicrobial activity of selected hydrogel films showed weak inhibitory activity against Escherichia coli, Pseudomonas aeruginosa, and Bacillus subtilis. The results obtained by the cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) indicate that chemically synthesized hydrogels have good characteristics for the supercapacitor application.

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Section: Resultssupporting

confidence: 90%

“…Almost equal swelling of 1-3 samples in alkaline and acidic medium studied over a longer period makes likely its use for specific applications such as medicine, pharmaceuticals for drug delivery, sensor manufacturing, separators in electrochemical devices (batteries, capacitors and the like), etc. [ 44 ].…”

Section: Resultsmentioning

confidence: 99%

Cellulose-g-poly(2-(dimethylamino)ethylmethacrylate) Hydrogels: Synthesis, Characterization, Antibacterial Testing and Polymer Electrolyte Application

Blažic

Grgić

Roković

et al. 2022

Gels

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“…14 In a previous work, we have investigated some of those membranes as pH-responsive, and we have demonstrated that they can be also applied in solvent dehydration processes by varying the pH of the mixture. 15 However, due to the low degree of cross-linking and presence of the copolymer, those membranes show poor performance for ethanol/ water separation, that is, the selectivity is too low. Thus, being encouraged by the results of our previous study, we hypothesized that the synthesis and use of tailor-made copolymers (rather than commercial copolymers produced for other applications) based on N-vinylpyrrolidone (NVP), 2-(dimethylamino)ethyl methacrylate (DMAEMA) and Nvinylimidazole (NVIm) with a controlled molar ratio of monomers in the copolymer, can improve the water/ ethanol selectivity of this type of membranes.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of tailor‐made N‐vinylpyrrolidone copolymers and their blend membranes with polyvinyl alcohol for bioethanol dehydration by pervaporation

Angelini

Fodor

Leva³

et al. 2021

J of Applied Polymer Sci

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Tailor‐made poly(N‐vinylpyrrolidone‐co‐(2‐[dimethylamino]ethyl methacrylate)) P(NVP‐co‐DMAEMA) and poly(N‐vinylpyrrolidone‐co‐N‐vinylimidazole) P(NVP‐co‐PNVIm) with defined monomer molar ratio are synthesized via free radical polymerization. The random copolymers are fully characterized and then blended with polyvinyl alcohol (PVA) to investigate their chemical and thermal properties as membrane materials. Composite membranes are further prepared from the PVA/copolymer blends on a porous support, which are evaluated in terms of separation performance for the dehydration of ethanol by pervaporation. The membranes prepared from the blends exhibit up to four times higher water permeances than pristine PVA membrane, albeit the selectivity is slightly lower. Nevertheless, the membranes from blends with a ratio of 95:5 (PVA/copolymer) show improved selectivity and higher permeance values compared to the commercial PERVAP™ 4155–80, especially the blends composed by the copolymers of coPDMAEMA60 and coPDMAEMA20. The membrane prepared from the blend containing the homopolymer coPDMAEMA100 exhibits the highest water/ethanol selectivity and shows stable separation performance throughout the whole long‐term stability test. Thus, this study demonstrated that by synthesizing tailored copolymers (rather using the commercial ones) and blending with PVA, the separation performance of membranes can be significantly improved and tuned for specific dehydration processes.

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“…[ 34 ] The peak at 1400 cm −1 is the absorption peak of the C–N stretching vibrations of PVP. [ 35 ] The bands located at 2900 and 2980 cm −1 are related to the CH 2 asymmetric stretching mode of PVP and PEO. [ 36,37 ] The peak located at 3670 cm −1 is from quartz glass.…”

Section: Resultsmentioning

confidence: 99%

Atmospheric All‐Solution‐Processed Perovskite Light‐Emitting Diodes

Cheng

Liu

Kang

et al. 2022

Physica Rapid Research Ltrs

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Metal halide perovskites are candidates for the next generation of optoelectronic materials, owing to their solution-processable method, excellent carrier mobility, diffusion length, high color purity, and narrow emission bandwidth. Moreover, the simple preparation and low cost of perovskite materials provide great potential in solar cells, photodetectors, light-emitting diodes (LED), memristors, and other fields. [1][2][3][4] Perovskite materials can usually be expressed as ABX 3 , A-and B-sites are cations, while X-sites are anions that form BX 6 octahedrons with the B-site cations. The A-site cations reside in the skeleton cavities of these BX 6 octahedrons and the A-site cations are larger than the B-site cations. As shown in Figure 1a, A-site cations are MA þ (methylammonium), FA þ (formamidinium) or Cs þ , etc., B-site cations are Pb 2þ , and X-site anions are several of Cl À , Br À , and I À . [5] When the A-site cations are large enough, perovskite turns the 3D structure into a 2D angular shared octahedral inorganic quantum well structure. In general, the 2D perovskite is mixed with different layers called quasi-2D. This leads to an energy funnel process where carriers flow from the quasi-2D of fewer layers to other layers, which facilitates the injection of charge carriers. [3] Perovskite quantum dot is a 0D perovskite material that has attracted the interest of many researchers due to its excellent photoluminescence (PL) quantum yield by its unique quantum effect. [6][7][8] On account of the advantages of perovskite materials, researchers have promoted the EQE of perovskite light-emitting diodes (PeLEDs) to increase from %3% to %23% in just a few years. [9,10] Researchers have also investigated in depth the modulation of the energy landscape and crystallization dynamics of PeLEDs. [11][12][13][14] With rapid performance improvements, PeLEDs show growing competitiveness in the field of next-generation display technology. However, almost all PeLEDs are fabricated in a nitrogen atmosphere glovebox (water and oxygen concentration < 0.1 ppm). The manufacturing operation of the electron transport layer (ETL) and the metal electrodes is always completed in ultrahigh vacuum (<10 À5 Pa) thermal evaporation equipment. [15] These manufacturing conditions and methods inevitably lead to high costs that make the application and popularity of the PeLEDs face critical challenges. Zhang et al. fabricated perovskite solar cells in ambient conditions that avoid the usage of a glovebox. They used carbon as the top electrode and the fabrication processes can be exposed to air. However, because the carbon electrode exhibits strong absorption in the visible band, it is difficult to play a role in the PeLEDs. [16,17] Solution fabrication of ETL is developed as the all-solution method that is beneficial for reducing the dependence on thermal evaporation. [18,19] Zhang et al. prepared TPBi-doped PFN and Shamsi et al. modified ZnO nanoparticles to obtain solution-fabricated ETL structures. [15,20] Meanwhile, the PeLEDs with ITO...

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pH-Triggered Membrane in Pervaporation Process

Cited by 16 publications

References 41 publications

Cellulose-g-poly(2-(dimethylamino)ethylmethacrylate) Hydrogels: Synthesis, Characterization, Antibacterial Testing and Polymer Electrolyte Application

Cellulose-g-poly(2-(dimethylamino)ethylmethacrylate) Hydrogels: Synthesis, Characterization, Antibacterial Testing and Polymer Electrolyte Application

Synthesis and characterization of tailor‐made N‐vinylpyrrolidone copolymers and their blend membranes with polyvinyl alcohol for bioethanol dehydration by pervaporation

Atmospheric All‐Solution‐Processed Perovskite Light‐Emitting Diodes

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