Submicron-thick, mixed-matrix membranes with metal-organic frameworks for CO2 separation: MIL-140C vs. UiO-67

Kang, Miso; Kim, Tea-Hoon; Han, Hyug Hee; Min, Hyo Jun; Bae, Youn‐Sang; Kim, Jong Hak

doi:10.1016/j.memsci.2022.120788

Cited by 14 publications

(3 citation statements)

References 48 publications

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“…The gas separation performance of the PBE/MOF-808 membranes is compared with those of other TFC-MMMs reported in the literature ( Figure 6 and Table 1 ) [ 38 , 39 , 40 , 41 , 42 , 43 ]. The gas separation performance of the TFC-MMMs in our study demonstrates high selectivity owing to the selective nanochannels originating from polymer-entrapped MOFs.…”

Section: Resultsmentioning

confidence: 99%

Polymer-Infiltrated Metal–Organic Frameworks for Thin-Film Composite Mixed-Matrix Membranes with High Gas Separation Properties

et al. 2023

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Thin-film composite mixed-matrix membranes (TFC-MMMs) have potential applications in practical gas separation processes because of their high permeance (gas flux) and gas selectivity. In this study, we fabricated a high-performance TFC-MMM based on a rubbery comb copolymer, i.e., poly(2-[3-(2H-benzotriazol-2-yl)-4-hydroxyphenyl] ethyl methacrylate)-co-poly(oxyethylene methacrylate) (PBE), and metal–organic framework MOF-808 nanoparticles. The rubbery copolymer penetrates through the pores of MOF-808, thereby tuning the pore size. In addition, the rubbery copolymer forms a defect-free interfacial morphology with polymer-infiltrated MOF-808 nanoparticles. Consequently, TFC-MMMs (thickness = 350 nm) can be successfully prepared even with a high loading of MOF-808. As polymer-infiltrated MOF is incorporated into the polymer matrix, the PBE/MOF-808 membrane exhibits a significantly higher CO2 permeance (1069 GPU) and CO2/N2 selectivity (52.7) than that of the pristine PBE membrane (CO2 permeance = 431 GPU and CO2/N2 selectivity = 36.2). Therefore, the approach considered in this study is suitable for fabricating high-performance thin-film composite membranes via polymer infiltration into MOF pores.

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Section: Resultsmentioning

confidence: 99%

Polymer-Infiltrated Metal–Organic Frameworks for Thin-Film Composite Mixed-Matrix Membranes with High Gas Separation Properties

et al. 2023

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“…The absolute polymer crystallinity is determined by integration of the PEO melt event around 60 °C in the heating segment of the DSC scans (Figure b, all compositions shown in Figure S8). The PEO melting transition is obvious at low MOF loadings but is significantly diminished at high MOF loadings as the polymer chains associate with filler particles or infiltrate within the porous MOF structure, a common observation for these types of composites. ,− We report the measured mass fraction of crystalline PEO relative to the total amount of PEO in the sample for each different film in Figure c. The quantities are normalized so that a value of 1 represents the enthalpy of fusion for 100% crystalline PEO, allowing us to compare different film compositions directly.…”

Section: Characterization Of Composite Structuresmentioning

confidence: 99%

Assessing Composite Structure in Metal–Organic Framework-Polymer Mixed-Matrix Membranes

Baumann,

Beaucage,

Vallery

et al. 2024

Chem. Mater.

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Metal−organic frameworks (MOFs) are renowned for their tunable structure, porosity, and internal chemistry, with demonstrated applications in molecular separations, storage, and conversion. While they are widely usable, the powdery characteristics of MOF materials can be limiting for large-scale processing and implementation in devices. Incorporating MOF particles into polymer supports affords engineering solutions to overcome these issues, yet the nature of the resulting composites is difficult to assess. In this work, we present spectroscopic and calorimetric methods that we believe help establish a holistic physicochemical picture of the composite structure using a series of Zr MOFs with different pore sizes as a testbed. Power law decays are observed in X-ray scattering profiles in low q-space ranging between 2.4 and 3.3, which we interpret as changes in scattering due to polymer infiltrating MOF particles. This interpretation is supported by solid-state nuclear magnetic resonance spectroscopy and differential scanning calorimetry measurements that identify populations of the MOF-associated polymer. Additionally, positron annihilation lifetime spectroscopy measurements collected on a series of composites with different MOF-polymer ratios show multiple decay constants, each correlated to a different free volume elements. In combination with the spectroscopic, calorimetric, and scattering results, we utilize the trends in decay constants as a function of polymer mass fraction to hypothesize a polymer infiltration mechanism whereby large pores are preferentially filled, followed by small pores and, later still, interstitial spaces between particles. Even with vigorous investigation of polymer, MOF, and interface characteristics, the complex and heterogeneous nature of the composites makes absolute structural assertions difficult. We envision that the approaches demonstrated here will be a useful foundation to assess and ultimately guide the design of future MOFpolymer composites.

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“…5c and d). 60 The Kratky plot ( q vs. q 2 I ) of the poly(glycidyl methacrylate- co -poly(oxyethylene methacrylate)) (PGO) copolymer showed a plateau at an elevated q value, signifying an extended or pliable structure. In contrast, the Kratky plot of MMMs revealed a bell-shaped curve, suggesting a condensed structure.…”

Section: Advanced Characterisation Techniquesmentioning

confidence: 99%

Recent advances in the interfacial engineering of MOF-based mixed matrix membranes for gas separation

Yu,

Li,

Zhao

et al. 2024

Nanoscale

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Submicron-thick, mixed-matrix membranes with metal-organic frameworks for CO2 separation: MIL-140C vs. UiO-67

Cited by 14 publications

References 48 publications

Polymer-Infiltrated Metal–Organic Frameworks for Thin-Film Composite Mixed-Matrix Membranes with High Gas Separation Properties

Polymer-Infiltrated Metal–Organic Frameworks for Thin-Film Composite Mixed-Matrix Membranes with High Gas Separation Properties

Assessing Composite Structure in Metal–Organic Framework-Polymer Mixed-Matrix Membranes

Recent advances in the interfacial engineering of MOF-based mixed matrix membranes for gas separation

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