Effect of solvent type on the morphology and gas permeation properties of polysulfone–silica nanocomposite membranes

Chenar, Mahdi Pourafshari; Rajabi, Hamed; Pakizeh, Majid; Sadeghi, Morteza; Bolverdi, Ali

doi:10.1007/s10965-013-0216-3

Cited by 23 publications

(7 citation statements)

References 29 publications

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“…Recent molecular dynamics simulations performed by Cheng and Grest demonstrated that strong particle–matrix interactions may lead to NPs accumulating at the solvent evaporation interface, whereas NPs that are only partially wetted by the polymer matrix are more uniformly distributed in the bulk polymer. Additionally, it is well-known that numerous other processing factors affect the dispersion of NPs in a composite film fabricated by solution casting, including rate of solvent evaporation, type of solvent, and mixing mechanism. − …”

Section: Introductionmentioning

confidence: 99%

Leveraging Nanoparticle Dispersion State To Tune Vanadium Ion Selectivity of Nanophase-Segregated Ionomer Nanocomposites for Redox Flow Batteries

Domhoff

Balwani

Martin

et al. 2019

ACS Appl. Energy Mater.

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Ionomer nanocomposites provide a promising solution to address ion crossover issues inherent to traditional ion-containing membranes used in batteries for grid-scale energy storage (e.g., vanadium redox flow batteries). Herein, we investigate the impact of nanoparticle surface chemistry on nanoparticle dispersion, membrane morphology, and vanadium ion permeability in a series of Nafion nanocomposites. Specifically, silica nanoparticles (SiNPs) were functionalized with various chemical moieties, seven in total, that electrostatically interact, either attractively or repulsively, with the sulfonic acid groups that coalesce to form the ionic network within Nafion. As seen from electron microscopy analysis of the nanocomposites, SiNPs with sulfonic acid end-functionality were, on average, well dispersed within the ionomer membrane, though increased vanadium ion permeability, as compared to pristine (or unmodified) Nafion, was observed and attributed to changes in the Donnan potential of the system. In contrast, SiNPs with amine end-functionality were, on average, observed to form large aggregates within the ionomer membrane. Surprisingly, nanocomposites containing a higher degree of nanoparticle aggregation demonstrated the lowest vanadium ion permeability. Fractal analysis of the low-Q small-angle neutron scattering data suggests that the interface between the ionomer and the SiNP surface transitions from rough to smooth when the nanoparticle surface is changed from sulfonic acid-functionalized to amine-functionalized.

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Section: Introductionmentioning

confidence: 99%

Leveraging Nanoparticle Dispersion State To Tune Vanadium Ion Selectivity of Nanophase-Segregated Ionomer Nanocomposites for Redox Flow Batteries

Domhoff

Balwani

Martin

et al. 2019

ACS Appl. Energy Mater.

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“…When the solvent volume was increased from 0 to 20 mL (Table S2, entries 1–5), the solubility increased. Previously, it has been reported that a ratio of 9:1 of DMAc to PPEES was used to dissolve the polymer fully …”

Section: Resultsmentioning

confidence: 99%

“…Previously, it has been reported that a ratio of 9:1 of DMAc to PPEES was used to dissolve the polymer fully. 58 With the intention to study changes in sample thermal stability in the presence of nitric acid, the reaction mixtures of two samples were analyzed using thermogravimetric analysis (Figure 1). The initial drop in weight is due to the loss of the solvent until about 160 °C (boiling point of DMAc = 165 °C).…”

Section: Resultsmentioning

confidence: 99%

Nanoporous Co/Mn-Mixed Metal Oxides Templated via Polysulfones for Amine Oxidation

Khanna

Eddy

Dang

et al. 2020

ACS Appl. Nano Mater.

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Herein, we report syntheses of microporous and mesoporous mixed metal oxides templated via an anionic surfactant. The effects of acid treatment, solvent type, and the amount of metal incorporation were investigated. Two different cobalt–manganese oxide spinels that were synthesized with surface areas as high as 137 m2/g were obtained. These nanomaterials indicate 3.8 nm monomodal pore sizes with crystallite sizes of 2.4–3.6 nm. 59Co MASNMR studies have shown that quadrupole coupling values from 1500 to 5000 kHz with asymmetry values ranging from 0.1 to 1 have been used to identify cobalt oxidation states. Amine oxidation was used as a model reaction, which allowed for imide yields of above 90% from benzylamine homocoupling. The use of these nanoporous oxides allows for a high-yielding homocoupling of benzylamine.

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“…Mahajan and Koros (2000) emphasize that an ideal MMM solution system requires polymer-filler interaction stronger than fillersolvent and polymer solvent, hence solvent can be easily desorb by the filler and minimize stress on filler's surface. Compared to DMAc, NMP has higher Hansen solubility parameter for PSf and can easily dissolve the polymer (Pourafshari Chenar et al, 2013). However, there is limitation in literature study regarding liquid-solid interaction strength parameters available for ZIF-8 in solvent and conclusive statement cannot be made.…”

Section: Hollow Fiber Membrane Performancesmentioning

confidence: 98%

Limitation in Fabricating PSf/ZIF-8 Hollow Fiber Membrane for CO2/CH4 Separation

Nordin

Ismail

Racha

et al. 2018

Indonesian J. Sci. Technol

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Hollow fiber membrane configuration is way forward in membrane development since it possesses higher packing density and effective surface area per unit module compared to other configuration. Since majority of mixed matrix membrane (MMM) for gas separation reported focuses on flat sheet membrane development, this report aims to address the challenges faced in fabricating hollow fiber MMM. In this study, hollow fiber formulation is fabricated and their MMM using different types of fillers (virgin and modified ZIF-8) are prepared and used as a dispersed phase. The neat hollow fiber membrane shows good results with CO2 permeance of 104.39 GPU and CO2/CH4 selectivity of 29.28, in comparison with reported literature. Upon filler incorporation, the resulted MMMs appear to be diminished in both CO2 permeance and CO2/CH4 selectivity. While using modified ZIF-8, lesser deterioration was shown compared to pure ZIF-8, this phenomenon is likely to occur due to the changes in solution stability which causes notable changes in membrane morphology and performances.

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Effect of solvent type on the morphology and gas permeation properties of polysulfone–silica nanocomposite membranes

Cited by 23 publications

References 29 publications

Leveraging Nanoparticle Dispersion State To Tune Vanadium Ion Selectivity of Nanophase-Segregated Ionomer Nanocomposites for Redox Flow Batteries

Leveraging Nanoparticle Dispersion State To Tune Vanadium Ion Selectivity of Nanophase-Segregated Ionomer Nanocomposites for Redox Flow Batteries

Nanoporous Co/Mn-Mixed Metal Oxides Templated via Polysulfones for Amine Oxidation

Limitation in Fabricating PSf/ZIF-8 Hollow Fiber Membrane for CO2/CH4 Separation

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