Mixed‐Matrix‐Membranen

Dechnik, Janina; Gascón, Jorge; Doonan, Christian J.; Janiak, Christoph; Sumby, Christopher J.

doi:10.1002/ange.201701109

Cited by 73 publications

(11 citation statements)

References 211 publications

(144 reference statements)

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“…[22] Interestingly,researchers have recently created as elf-folding composite film through the opposite strategy;t hey incorporated swellable cyclopentanone as the guest into an on-swellable polymer host. [24] To synthesise these films,w ec hose MIL-88A as ar epresentative swelling MOF and polyvinylidene difluoride (PVDF) as the passive polymer matrix. Note that this type of composite films are known as mixed matrix membranes in separation processes.…”

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confidence: 84%

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A Self‐Folding Polymer Film Based on Swelling Metal–Organic Frameworks

et al. 2018

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Herein, we exploit the well-known swelling behaviour of metal-organic frameworks (MOFs) to create as elffolding polymer film. Namely,w es howt hat incorporating crystals of the flexible MOF MIL-88A into ap olyvinylidene difluoride (PVDF) matrix affords ap olymer composite film that undergoes reversible shape transformations upon exposure to polar solvents and vapours.S ince the self-folding properties of this film correlate directly with the swelling properties of the MIL-88A crystals,i ts electively bends to certain solvents and its degree of folding can be controlled by controlling the relative humidity.M oreover,i ts hows as hapememory effect at relative humidity values from 60 %t o9 0%. As proof of concept, we demonstrate that these composite films can lift cargo and can be used to assemble 3D structures from 2D patterns.O ur strategy is as traightforwardm ethod for designing autonomous soft materials with folding properties that can be tuned by judicious choice of the constituent flexible MOF.Among the most fascinating properties of certain metalorganic frameworks (MOFs) is their structural flexibility in response to external stimuli. Contrary to rigid crystalline porous materials (e.g.z eolites or aluminophosphates), the highly ordered networks of flexible MOFs,also known as soft porous crystals, [1] can undergo reversible dynamic structural transformations. [2] This flexibility arises from the reversible nature of the coordination bonds and weaker supramolecular interactions within MOFs,w hich allow for conformational changes of secondary building units and organic linkers.Over the past decade,this intriguing aspect of MOF chemistry has been investigated, leading to the discovery of numerous structural-transition phenomena, including thermal expansion, [3] linker rotation, [4] and subnetwork displacement. [5] Among the most interesting of flexible MOFs are swelling MOFs,w hich undergo expansion or contraction owing to adsorption or desorption, respectively. [6] Ap rime example is the isoreticular Fe III dicarboxylate MIL-88 family (MIL = Materials from Institute Lavoisier), in which the MOF unitcell volume exhibits reversible enlargement upon adsorption of polar solvent molecules owing to the formation of hydrogen bond interactions between guest molecules and the framework. [7] In these MOFs,t he swelling can be strongly influenced by the solvent and by the functional groups in the linkers. [8] Beyond molecular-level changes,aremarkable effect of such lattice swelling is the subsequent macroscopic deformation of the crystals. [8b] Our group considered that the aforementioned phenomenon had been overlooked in the development of functional materials,sowebegan to reflect on how such swelling might be exploited to develop novel soft materials capable of reversible shape transformations.I nt his regard, self-folding materials,which are able to translate external stimuli such as thermal, light, electrical, or chemical energy into useful and predictable shape transformations,are garnering attention for their po...

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confidence: 84%

“…Note that this type of composite films are known as mixed matrix membranes in separation processes. [24] To synthesise these films,w ec hose MIL-88A as ar epresentative swelling MOF and polyvinylidene difluoride (PVDF) as the passive polymer matrix. Ther esulting film (hereafter called MIL-88A@PVDF) exhibited self-folding in response to solvents (e.g.…”

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confidence: 99%

A Self‐Folding Polymer Film Based on Swelling Metal–Organic Frameworks

et al. 2018

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“…In terms of fillers, porosity is an important factor affecting CO2 uptake and selectivity, playing a key role on the MMMs performance [28,29]. Several studies have been devoted to the influence of the filler particle size and morphology [12,[30][31][32][33] as well as filler functionalities [34] on the membrane performance. However, the role of the fillers' porosity has remained largely unexplored.…”

Section: Introductionmentioning

confidence: 99%

Benzimidazole linked polymers (BILPs) in mixed-matrix membranes: Influence of filler porosity on the CO2/N2 separation performance

Shan

Seoane

Pustovarenko

et al. 2018

Journal of Membrane Science

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The performance of mixed-matrix membranes (MMMs) based on Matrimid® and benzimidazole-linked polymers (BILPs) have been investigated for the separation CO2/N2 and the dependency on the filler porosity. BILPs with two different porosities (BILP-101 and RT-BILP-101) were synthesized through controlling the initial polymerization rate and further characterized by several techniques (DRIFTs, 13 C CP/MAS NMR, SEM, TEM, N2 and CO2 adsorption). To investigate the influence of porosity, the two types of fillers were incorporated into Matrimid® to prepare MMMs at varied loadings (8, 16 and 24 wt.%). SEM confirmed the well dispersion of BILP-101 and RT-BILP-101 indicating their good compatibility with polymer matrix. The partial pore blockage in the membrane was verified by CO2 adsorption isotherms on the prepared membranes. In the separation of CO2 from a 15:85 CO2:N2 mixture at 308 K, the incorporation of both BILPs fillers resulted in an enhancement in gas permeability together with constant selectivity owing to the fast transport pathways introduced by the porous network. It was noteworthy that the initial porosity of the filler had a large impact in separation permeability. The best improvement was achieved by 24 wt.% RT-BILP-101 MMMs, for which the CO2 permeability increases up to 2.8-fold (from 9.6 to 27 Barrer) compared to the bare Matrimid®.

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“…This usually depends on various parameters; type, morphology and particle size of material filler (i. e. zeolites, silica, carbonaceous materials, or metal organic frameworks (MOFs)), interaction and chemical affinity between fillers and polymers (i. e. surface functionality and defectivity), as well as concentration, orientation, and permeation properties of the two components. Among all filler materials, MOFs (a family of crystalline porous hybrid materials composed by metal nodes, or polynuclear clusters, linked by multidentate organic compounds) have gained great attention due to their exceptional tunability (in structure, composition, porosity, particle size, defectivity and functionality) leading to outstanding enhancement of MMM separation performance [4–6] …”

Section: Figurementioning

confidence: 99%

Non‐Destructive Three‐Dimensional Imaging of Metal Organic Framework Mixed Matrix Membranes using Lab‐based X‐ray Computed Tomography

et al. 2021

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Two‐dimensional composites of metal particles and polymers hold the promise to enable revolutionary applications. The research and development of these films have been ongoing for over 60 years and new manufacturing and characterization techniques keep increasing the pace of advancements. Retrieving quantitative information from these types of samples can be a difficult and time‐consuming task when using line of sight imaging modalities. In this work a mixed‐matrix membrane with Co‐containing ZIF‐67 was studied with lab‐based X‐ray computed tomography. The benefits and limitations of what the computed tomography technique has to offer are presented and discussed.

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Mixed‐Matrix‐Membranen

Cited by 73 publications

References 211 publications

A Self‐Folding Polymer Film Based on Swelling Metal–Organic Frameworks

A Self‐Folding Polymer Film Based on Swelling Metal–Organic Frameworks

Benzimidazole linked polymers (BILPs) in mixed-matrix membranes: Influence of filler porosity on the CO2/N2 separation performance

Non‐Destructive Three‐Dimensional Imaging of Metal Organic Framework Mixed Matrix Membranes using Lab‐based X‐ray Computed Tomography

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