Zeolitic imidazolate framework (ZIF-8) based polymer nanocomposite membranes for gas separation

Song, Qilei; Kotrappanavar, Nataraj Sanna; Roussenova, Mina; Tan, Jin‐Chong; Hughes, David; Li, Wei; Bourgoin, Pierre; Alam, M. A.; Cheetham, Anthony K.; Al‐Muhtaseb, Shaheen A.; Sivaniah, Easan

doi:10.1039/c2ee21996d

Cited by 663 publications

(481 citation statements)

References 73 publications

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“…In essence, we discover that fine debris of ZIF-8 nanoparticles encapsulated with Matrimid could facilitate the sliding-rolling contact mechanism, thus offering enhanced protection against unlubricated abrasive wear. This result bodes well for gas-adsorption and separation oriented applications because the annealed ZIF-8@Matrimid membranes not only show outstanding gas permeation properties, 11 but also excellent wear resistance performance. It will be rewarding for future work to explore the wear performance of mixed matrix membranes which incorporate MOFs featuring a range of porosity levels, architectures and chemical structures, and to investigate the effects of temperature on wear performance.…”

supporting

confidence: 55%

“…Matrimid ® 5218 is an example of a high-performance polyimide, featuring attractive combination of gas permeability and selectivity, 9 in combination with high glass transition temperature and excellent mechanical properties. 10 Interestingly, recent studies have demonstrated that the incorporation of MOFs, particularly zeolitic imidazolate frameworks (ZIFs) into certain polymers, such as Matrimid [11][12][13] and Polydimethylsiloxane (PDMS), 14 11 recently reported that ZIF nanoparticles could enhance diffusion of gasses through their porous cages in addition to the creation of free volume by disrupting the molecular packing of Matrimid, both of which yield an improvement in permeability. This novel grade of MOF-based nanocomposite membranes belongs to a rapidly growing research area, termed "mixed matrix membranes" (MMMs).…”

mentioning

confidence: 99%

“…%) to form ZIF-8@Matrimid MMM. 11 The ZIF-8 nanoparticles (mean diameter~150 nm) were synthesized using the rapid room temperature synthesis method, as described in Cravillon et al, 21 0.3 g of Zn(NO 3 ) 2 · 6H 2 O (procured from Fischer Scientific and used as is) was mixed with 0.66 g of 2-methylimidazole (Fischer Scientific) in 10 ml methanol each and stirred for an hour at room temperature, where a milky white precipitate was observed to form after a few minutes. The precipitate was separated from the solution via centrifugation (8000 rpm for 10 min), dispersed and kept suspended in chloroform for the preparation of the MMM.…”

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confidence: 99%

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Fine-scale tribological performance of zeolitic imidazolate framework (ZIF-8) based polymer nanocomposite membranes

et al. 2014

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We combined zeolitic imidazolate framework nanoparticles (ZIF-8: ˜150 nm diameter) with Matrimid® 5218 polymer to form permeable mixed matrix membranes, featuring different weight fractions of nanoparticles (up to 30 wt. % loading). We used ball-on-disc micro-tribological method to measure the frictional coefficient of the nanocomposite membranes, as a function of nanoparticle loading and annealing heat treatment. The tribological results reveal that the friction and wear of the unannealed samples rise steadily with greater nanoparticle loading because ZIF-8 is relatively harder than the matrix, thus promoting abrasive wear mechanism. After annealing, however, we discover that the nanocomposites display an appreciably lower friction and wear damage compared with the unannealed counterparts. Evidence shows that the major improvement in tribological performance is associated with the greater amounts of wear debris derived from the annealed nanocomposite membranes. We propose that detached Matrimid-encapsulated ZIF-8 nanoparticles could function as “spacers,” which are capable of not only reducing direct contact between two rubbing surfaces but also enhancing free-rolling under the action of lateral forces.

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confidence: 55%

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confidence: 99%

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confidence: 99%

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Fine-scale tribological performance of zeolitic imidazolate framework (ZIF-8) based polymer nanocomposite membranes

et al. 2014

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“…Gas permeation. Single gas transport properties were measured using a time-lag apparatus described in detail elsewhere 9,51 . The gas permeation tests were carried out at a temperature of 22°C and feed pressure of 1 bar with He, H 2 , CO 2 , O 2 , N 2 and CH 4 (research grade, BOC, UK).…”

Section: Fabrication Of Ultrafiltration Support Membranesmentioning

confidence: 99%

Polymer nanofilms with enhanced microporosity by interfacial polymerization

et al. 2016

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Highly permeable and selective membranes are desirable for energy-efficient gas and liquid separations.Microporous organic polymers have attracted significant attention in this respect owing to their high porosity, permeability, and molecular selectivity. However, it remains challenging to fabricate selective polymer membranes with controlled microporosity which are stable in solvents. Here we report a new approach to designing crosslinked, rigid polymer nanofilms with enhanced microporosity by manipulating the molecular structure. Ultra-thin polyarylate nanofilms with thickness down to 20 nm were formed in-situ by interfacial polymerisation. Enhanced microporosity and higher interconnectivity of intermolecular network voids, as rationalised by molecular simulations, are achieved by utilising contorted monomers for the interfacial polymerisation. Composite membranes comprising polyarylate nanofilms with enhanced microporosity fabricated in-situ on crosslinked polyimide ultrafiltration membranes show outstanding separation performance in organic solvents, with up to two orders of magnitude higher solvent permeance than membranes fabricated with nanofilms made from noncontorted planar monomers.Conventional gas and liquid separation processes such as evaporation and distillation are widely used in the oil and gas, energy, chemical, and pharmaceutical industries, but are energy-intensive. An alternative to these processes is membrane separation technology, which typically consumes an order of magnitude less energy. To enable wider deployment of membrane technology, highly permeable membranes are required to process large volumes of gas or solvent using a viable membrane area over a feasible timeframe 1-2 . There are two main strategies being followed to this end. One is to design the polymer structure at the molecular level so as to provide greater interconnected microporosity 3-10 , whilst a second approach is to reduce the thickness of the separating layer to nanometre scale [11][12][13][14][15][16] .Microporous organic materials with well-defined pore structure are excellent candidates for highly permeable and selective membranes 1 , such as metal-organic frameworks (MOFs) and porous coordination polymers (PCPs) [17][18] , covalent organic frameworks (COFs) [19][20] , and porous organic cages 2 (POCs) [21][22][23] . However, the fabrication of these crystalline solids to form defect-free membranes is technically challenging. Recent significant progress includes fabrication of MOFs to form selective membranes by secondary crystal growth 24 , assembly of MOF nanosheets 15 , interfacial synthesis 25 , or mixed matrix membranes 10,26 . By contrast, industrial membranes are dominated by solution processing of polymers and interfacial polymerisation, for example in producing polyamide desalination membranes. Notable examples of microporous polymers are polymers of intrinsic microporosity (PIMs) [6][7][27][28][29][30][31] . Owing to the shape and rigidity of the component monomers, the polymer chains have contorted, ri...

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“…Pure gas permeation tests were carried out at a feed pressure of 4 bar and at temperature of 22°C, using a constant volume pressure increase apparatus described elsewhere 50 . Mixed gas permeation was performed in another apparatus using the constant flow method, with certified gas mixtures of CO 2 /N 2 (50/50 vol.%) and CO 2 /CH 4 (50/50 vol.%) at feed pressure up to 35 bar at 22°C.…”

Section: Glass Substrate Polymermentioning

confidence: 99%

Photo-oxidative enhancement of polymeric molecular sieve membranes

et al. 2013

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High-performance membranes are attractive for molecular-level separations in industrialscale chemical, energy and environmental processes. The next-generation membranes for these processes are based on molecular sieving materials to simultaneously achieve high throughput and selectivity. Membranes made from polymeric molecular sieves such as polymers of intrinsic microporosity (pore sizeo2 nm) are especially interesting in being solution processable and highly permeable but currently have modest selectivity. Here we report photo-oxidative surface modification of membranes made of a polymer of intrinsic microporosity. The ultraviolet light field, localized to a near-surface domain, induces reactive ozone that collapses the microporous polymer framework. The rapid, near-surface densification results in asymmetric membranes with a superior selectivity in gas separation while maintaining an apparent permeability that is two orders of magnitude greater than commercially available polymeric membranes. The oxidative chain scission induced by ultraviolet irradiation also indicates the potential application of the polymer in photolithography technology.

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Zeolitic imidazolate framework (ZIF-8) based polymer nanocomposite membranes for gas separation

Cited by 663 publications

References 73 publications

Fine-scale tribological performance of zeolitic imidazolate framework (ZIF-8) based polymer nanocomposite membranes

Fine-scale tribological performance of zeolitic imidazolate framework (ZIF-8) based polymer nanocomposite membranes

Polymer nanofilms with enhanced microporosity by interfacial polymerization

Photo-oxidative enhancement of polymeric molecular sieve membranes

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