Interaction of Small Molecules within Metal Organic Frameworks Studied by In Situ Vibrational Spectroscopy

Tan, Kui; Chabal, Yves J.

doi:10.5772/64906

Cited by 6 publications

(5 citation statements)

References 31 publications

(37 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, no electron reflection was observed when assessing the nanosheets by high-resolution transmission electron microscopy (TEM), confirming the amorphous nature of the prepared MOF nanosheets (Figure d). The X-ray diffraction (XRD) pattern of the amorphous MOF nanosheets reveals broad, diffuse peaks in comparison with crystalline MOF-74-Cu, − offering further support for their amorphous structure (Figure e). Significantly, the amorphous MOF nanosheets display a similar attenuated total reflectance Fourier-transform infrared (ATR-FTIR) spectrum to that of the crystalline MOF-74-Cu (Figure S4), suggesting a similar coordination profile between the two morphologies.…”

Section: Resultsmentioning

confidence: 79%

Ultrapermeable Composite Membranes Enhanced Via Doping with Amorphous MOF Nanosheets

et al. 2021

View full text Add to dashboard Cite

Thin-film composite (TFC) polymeric membranes have attracted increasing interest to meet the demands of industrial gas separation. However, the development of high-performance TFC membranes within their current configuration faces two key challenges: (i) the thickness-dependent gas permeability of polymeric materials (mainly poly(dimethylsiloxane) (PDMS)) and (ii) the geometric restriction effect due to the limited pore accessibility of the underlying porous substrate. Here we demonstrate that the incorporation of trace amounts (∼1.8 wt %) of amorphous metal–organic framework (MOF) nanosheets into the gutter layer of TFC assemblies can simultaneously address these two limitations by the creation of rapid, transmembrane gas diffusion pathways. The resultant PDMS&MOF membrane displayed excellent CO2 permeance of 10450 GPU and CO2/N2 selectivity of 9.1. Leveraging this strategy, we successfully fabricate a novel TFC membrane, consisting of a PDMS&MOF gutter and an ultrathin (∼54 nm) poly(ethylene glycol) top selective layer via surface-initiated atom transfer radical polymerization. The complete TFC membrane exhibits excellent processability and remarkable CO2/N2 separation performance (1990 GPU with a CO2/N2 ideal selectivity of 39). This study reveals a strategy for the design and fabrication of a new TFC membrane system with unprecedented gas-separation performance.

show abstract

Section: Resultsmentioning

confidence: 79%

Ultrapermeable Composite Membranes Enhanced Via Doping with Amorphous MOF Nanosheets

et al. 2021

View full text Add to dashboard Cite

show abstract

“…There are several excellent reviews and book chapters focused on one or another aspect of the vibrational spectroscopy of MOFs. ,− In addition, a significant attention to vibrational characteristics of MOFs is paid in some books and reviews devoted to more general aspects of MOF materials. − ,− On the other hand, some recent spectroscopic reviews have paid specific attention to MOFs and their interaction with guest molecules. , …”

Section: Introductionmentioning

confidence: 99%

Power of Infrared and Raman Spectroscopies to Characterize Metal-Organic Frameworks and Investigate Their Interaction with Guest Molecules

et al. 2020

View full text Add to dashboard Cite

The variety of functionalities and porous structures inherent to metal-organic frameworks (MOFs) together with the facile tunability of their properties makes these materials suitable for a wide range of existing and emerging applications. Many of these applications are based on processes involving interaction of MOFs with guest molecules. To optimize a certain process or successfully design a new one, a thorough knowledge is required about the physicochemical characteristics of materials and the mechanisms of their interaction with guest molecules. To obtain such important information, various complementary analytical techniques are applied, among which vibrational spectroscopy (IR and Raman) plays an important role and is indispensable in many cases. In this review, we critically examine the reported applications of IR and Raman spectroscopies as powerful tools for initial characterization of MOF materials and for studying processes of their interaction with various gases. Both the advantages and the limitations of the technique are considered, and the cases where IR or Raman spectroscopy is preferable are highlighted. Peculiarities of MOFs interaction with specific gases and some inconsistent band assignments are also emphasized. Summarizing the broad analytical possibilities of the IR and Raman spectroscopies, we conclude that it can be applied in combinations with other techniques to explicitly establish the structure, properties, and reactivity of MOFs.

show abstract

“…In addition, no electron reflection was observed when assessing the nanosheets by high resolution transmission electron microscopy (TEM), confirming the amorphous nature of the prepared MOF nanosheets (Figure 1d). The X-ray diffraction (XRD) pattern of the amorphous MOF nanosheets reveals broad, diffuse peaks in comparison with crystalline MOF-74-Cu, [20][21][22][23] offering further support for their amorphous structure (Figure 1e). Significantly, the amorphous MOF nanosheets display a similar attenuated total reflectance Fourier-transform infrared (ATR-FTIR) spectroscopy as the crystalline MOF-74-Cu (Figure S4), suggesting a similar coordination profile between the two morphologies.…”

Section: Resultsmentioning

confidence: 83%

Physical Aging Investigations of a Spirobisindane-Locked Polymer of Intrinsic Microporosity

Liu

Lü

Nothling

et al. 2020

ACS Materials Lett.

View full text Add to dashboard Cite

Thin film composite (TFC) polymeric membranes have attracted increasing interest to meet the demands of industrial gas separation. However, the development of high performance TFC membranes within their current configuration faces two key challenges: (i) the thickness-dependent gas permeability of polymeric materials (mainly polydimethylsiloxane (PDMS)) and (ii) the geometric restriction effect due to the limited pore accessibility of the underlying porous substrate. Here we demonstrate that the incorporation of trace (~1.8 wt%) amounts of amorphous metal-organic framework (MOF) nanosheets into the gutter layer of TFC assemblies can simultaneously address these two limitations by the creation of rapid, transmembrane gas diffusion pathways. Leveraging this strategy, we successfully fabricate a novel TFC membrane, consisting of a PDMS&MOF gutter and an ultrathin (~54 nm) poly(ethylene glycol) top selective layer via surface-initiated atom transfer radical polymerization (ATRP). The complete TFC membrane exhibits excellent processability and remarkable CO 2 /N 2 separation permeance (1,990 GPU with a CO 2 /N 2 ideal selectivity of 39). This study reveals a strategy for the design and fabrication of a new TFC membrane system with unprecedented gas separation performance. ASSOCIATED CONTENT Supporting InformationThe Supporting Information is available free of charge on the ACS Publications website.

show abstract

Interaction of Small Molecules within Metal Organic Frameworks Studied by In Situ Vibrational Spectroscopy

Cited by 6 publications

References 31 publications

Ultrapermeable Composite Membranes Enhanced Via Doping with Amorphous MOF Nanosheets

Ultrapermeable Composite Membranes Enhanced Via Doping with Amorphous MOF Nanosheets

Power of Infrared and Raman Spectroscopies to Characterize Metal-Organic Frameworks and Investigate Their Interaction with Guest Molecules

Physical Aging Investigations of a Spirobisindane-Locked Polymer of Intrinsic Microporosity

Contact Info

Product

Resources

About