Correlation of Gas Permeability in a Metal-Organic Framework MIL-101(Cr)–Polysulfone Mixed-Matrix Membrane with Free Volume Measurements by Positron Annihilation Lifetime Spectroscopy (PALS)

Jeazet, Harold B. Tanh; Koschine, Tönjes; Staudt, Claudia; Raetzke, K.; Janiak, Christoph

doi:10.3390/membranes3040331

Cited by 67 publications

(38 citation statements)

References 104 publications

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“…Examples reported by some of the present authors include storage stability predictions in epoxide mixtures, 45 characterization of nanocomposites for membrane applications, 46,47 and aging of thin polymer lms. 48,49 Recently, Chai et al used PALS to study thin lms of oleic acid-stabilized PbSe nanocrystals with respect to surface composition.…”

Section: 44mentioning

confidence: 99%

Gold nanoparticle superlattices: structure and cavities studied by GISAXS and PALS

Olichwer¹,

Koschine

Meyer³

et al. 2016

RSC Adv.

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The performance of nanoparticle assemblies with respect to various applications (e.g. sensors, catalysts, filtration membranes) depends on their microporosity. Here, the microcavities within the ligand matrix of superlattice films comprised of 1-dodecanethiol-stabilized gold nanoparticles (GNPs, core diameter $4 and $5.5 nm) were studied by positron annihilation lifetime spectroscopy (PALS). The superlattice composition, the size and spatial arrangement of the GNP cores were characterized by thermogravimetric analysis, transmission electron microscopy and grazing-incidence small-angle X-rayscattering. From these data a structural model was derived to predict the sizes of the voids formed within the interstitial (tetrahedral and octahedral) sites of the superlattices. The comparison of the PALSmeasured cavity sizes (0.50 to 0.74 nm) with the predicted void sizes of the interstitial sites ($0.7 to $1.7 nm) and the free volume in solid dodecane (0.36 nm), previously measured by PALS, indicate that both types of cavities may contribute to the experimentally determined cavity sizes. However, the GNP core sizes had only a minor influence on the measured cavity size. Larger cavities with sizes corresponding to the voids ($1.7 nm) expected within the octahedral sites of the superlattices comprised of $5.5 nm-sized GNP cores could not be detected. Assuming the intensities arising from these voids are measurable, this finding suggests that the octahedral sites are occupied by excess ligands trapped during film preparation.Apart from the voids predicted for the interstitial sites, the larger cavity sizes measured for the GNP superlattices compared to crystalline dodecane may result from some degree of disorder in the ligand arrangement.

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Section: 44mentioning

confidence: 99%

Gold nanoparticle superlattices: structure and cavities studied by GISAXS and PALS

Olichwer¹,

Koschine

Meyer³

et al. 2016

RSC Adv.

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“…[69] Weight loss observed between 150 and 300 °C for MIL-101(Cr) is ascribable to residual organic linker entrapped in the inner MOF porosity. [70] The experiments carried for characterization allow to confirm the successful synthesis of MOFs.…”

Section: Resultsmentioning

confidence: 96%

MOF@PEDOT Composite Films for Impedimetric Pesticide Sensors

et al. 2020

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Due to its deleterious effects on health, development of new methods for detection and removal of pesticide residues in primary and derived agricultural products is a research topic of great importance. Among them, imazalil (IMZ) is a widely used post‐harvest fungicide with good performances in general, and is particularly applied to prevent green mold in citrus fruits. In this work, a composite film for the impedimetric sensing of IMZ built from metal‐organic framework nanocrystallites homogeneously distributed on a conductive poly(3,4‐ethylene dioxythiophene) (PEDOT) layer is presented. The as‐synthetized thin films are produced via spin‐coating over poly(ethylene terephtalate (PET) substrate following a straightforward, cost‐effective, single‐step procedure. By means of impedance spectroscopy, electric transport properties of the films are studied, and high sensitivity towards IMZ concentration in the range of 15 ppb to 1 ppm is demonstrated (featuring 1.6 and 4.2 ppb limit of detection, when using signal modulus and phase, respectively). The sensing platform hereby presented could be used for the construction of portable, miniaturized, and ultrasensitive devices, suitable for pesticide detection in food, wastewater effluents, or the assessment of drinking‐water quality.

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“…From PALS studies, the authors concluded that the introduction of ZIF-8 in the polymer increases the free volume and the interconnectivity of the free volume of the membrane, which may result in faster diffusivities. [229]. SEM images (Figure 28a) of the MMMs showed even MOF distributions and good wetting of the particles by the polymer.…”

Section: Mofs In Mmmsmentioning

confidence: 96%

Origins and Evolution of Inorganic-Based and MOF-Based Mixed-Matrix Membranes for Gas Separations

et al. 2016

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Abstract:Gas separation for industrial, energy, and environmental applications requires low energy consumption and small footprint technology to minimize operating and capital costs for the processing of large volumes of gases. Among the separation methods currently being used, like distillation, amine scrubbing, and pressure and temperature swing adsorption, membrane-based gas separation has the potential to meet these demands. The key component, the membrane, must then be engineered to allow for high gas flux, high selectivity, and chemical and mechanical stability at the operating conditions of feed composition, pressure, and temperature. Among the new type of membranes studied that show promising results are the inorganic-based and the metal-organic framework-based mixed-matrix membranes (MOF-MMMs). A MOF is a unique material that offers the possibility of tuning the porosity of a membrane by introducing diffusional channels and forming a compatible interface with the polymer. This review details the origins of these membranes and their evolution since the first inorganic/polymer and MOF/polymer MMMs were reported in the open literature. The most significant advancements made in terms of materials, properties, and testing conditions are described in a chronological fashion.

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Correlation of Gas Permeability in a Metal-Organic Framework MIL-101(Cr)–Polysulfone Mixed-Matrix Membrane with Free Volume Measurements by Positron Annihilation Lifetime Spectroscopy (PALS)

Cited by 67 publications

References 104 publications

Gold nanoparticle superlattices: structure and cavities studied by GISAXS and PALS

Gold nanoparticle superlattices: structure and cavities studied by GISAXS and PALS

MOF@PEDOT Composite Films for Impedimetric Pesticide Sensors

Origins and Evolution of Inorganic-Based and MOF-Based Mixed-Matrix Membranes for Gas Separations

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