scholarly journals 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)

Membranes ◽  
2013 ◽  
Vol 3 (4) ◽  
pp. 331-353 ◽  
Author(s):  
Harold Jeazet ◽  
Tönjes Koschine ◽  
Claudia Staudt ◽  
Klaus Raetzke ◽  
Christoph Janiak
Keyword(s):  
Positron Annihilation ◽  
Free Volume ◽  
Gas Permeability ◽  
Metal Organic Framework ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
Mixed Matrix Membrane ◽  
Mixed Matrix ◽  
Positron Annihilation Lifetime ◽  
Volume Measurements ◽  
Metal Organic

Fabrication and Characterization of PVDF/UiO-66(Zr) Mixed Matrix Membrane on Non-Woven PET Support

2020 ◽  
Vol 1005 ◽  
pp. 108-115
Author(s):  
John Rhoel Cementina ◽  
Michael V. Torres ◽  
Dante P. Bernabe ◽  
Stephen Lirio ◽  
Micah Belle Marie Yap Ang ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Polyvinylidene Fluoride ◽  
Gas Permeability ◽  
Metal Organic Framework ◽  
Pure Water ◽  
Polymer Concentration ◽  
Water Flux ◽  
Mixed Matrix Membrane ◽  
Mixed Matrix ◽  
Metal Organic

Polyvinylidene fluoride (PVDF) membranes, enhanced with metal-organic framework (MOF), were fabricated on a non-woven polyethylene terephthalate (PET) support using the non-solvent induced phase inversion (NIPS) method to produce mixed matrix membrane (MMM). Polymer concentration of 10%, 15%, and 20% were used in the study whereas UiO-66(Zr) was used as a MOF filler. The resulting membranes were characterized in terms of their morphology, porosity, wettability, mechanical strength, pure water flux, and gas permeability. Results show that the presence of UiO-66(Zr) filler improved membrane morphology, mechanical strength, and hydrophobicity of MMM as compared to pristine PVDF.

Microporous Aluminum Fumarate (A520) Metal-Organic Framework as Modifier to Free-Standing Mixed Matrix Membrane

2018 ◽  
Vol 934 ◽  
pp. 170-175 ◽  
Author(s):  
Dante P. Bernabe ◽  
Alvin R. Caparanga ◽  
Chien-Chieh Hu ◽  
Sheng Jie You ◽  
Kueir Rarn Lee ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Membrane Integrity ◽  
Mechanical Analysis ◽  
Mixed Matrix Membrane ◽  
Mixed Matrix ◽  
Free Standing ◽  
Sem Images ◽  
Positron Annihilation Lifetime ◽  
Metal Organic ◽  
Loading Amount

Microporous aluminum fumarate (A520) is one of the very few metal-organic frameworks (MOFs) that have been promoted to the level of commercial applications and has recently been proven to exhibit a rigid character with an accessible permanent porosity. This study explored the maximum loading amount of A520 for mixed matrix membrane (MMM) preparation by blending it with polyimide (PI) using N-methylpyrrolidone (NMP) as solvent, without compromising the membrane integrity. Scanning electron microscope (SEM) images revealed that MOFs were able to infiltrate the pores and structures of the polymer, improving the interface and mechanical properties of the polymer, as supported by different characterizations like dynamic mechanical analysis (DMA), x-ray diffraction (XRD), and positron annihilation lifetime spectroscopy (PALS). Results showed that MOF loading beyond 10wt% revealed aggregations that compromised the integrity of the membrane.

scholarly journals Porosity in metal–organic framework glasses

2016 ◽  
Vol 52 (19) ◽  
pp. 3750-3753 ◽  
Author(s):  
A. W. Thornton ◽  
K. E. Jelfs ◽  
K. Konstas ◽  
C. M. Doherty ◽  
A. J. Hill ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Metal Organic Framework ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
Melt Quenching ◽  
Positron Annihilation Lifetime ◽  
Metal Organic ◽  
Organic Framework

The porosity of a glass formed by melt-quenching a metal–organic framework, has been characterized by positron annihilation lifetime spectroscopy.

Fabrication of mixed-matrix membrane containing metal–organic framework composite with task-specific ionic liquid for efficient CO2 separation

2016 ◽  
Vol 4 (19) ◽  
pp. 7281-7288 ◽  
Author(s):  
Jing Ma ◽  
Yunpan Ying ◽  
Xiangyu Guo ◽  
Hongliang Huang ◽  
Dahuan Liu ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Gas Permeability ◽  
Metal Organic Framework ◽  
Mixed Matrix Membranes ◽  
Mixed Matrix Membrane ◽  
Mixed Matrix ◽  
Nanoporous Metal ◽  
Metal Organic ◽  
Task Specific Ionic Liquid ◽  
Organic Framework

Gas permeability and selectivity for CO2/N2 separation were improved simultaneously in mixed-matrix membranes formed by a nanoporous metal–organic framework with a task-specific ionic liquid in PIM-1.

Enhanced Dye Adsorption of Mixed‐Matrix Membrane by Covalent Incorporation of Metal‐Organic Framework with Poly(styrene‐ alt ‐maleic anhydride)

2021 ◽  
Vol 6 (19) ◽  
pp. 4689-4697
Author(s):  
Xuan Thang Cao ◽  
The Ky Vo ◽  
Tran Nguyen Minh An ◽  
Trinh Duy Nguyen ◽  
Daniel Manaye Kabtamu ◽  
...  
Keyword(s):  
Maleic Anhydride ◽  
Metal Organic Framework ◽  
Dye Adsorption ◽  
Mixed Matrix Membrane ◽  
Mixed Matrix ◽  
Metal Organic ◽  
Organic Framework

Preliminary Positron Lifetime Results on Free Volumes in Cyclodextrins

2010 ◽  
Vol 666 ◽  
pp. 99-102 ◽  
Author(s):  
Maria Fatima Ferreira Marques ◽  
A.M.G. Moreira Da Silva ◽  
P.M. Gordo ◽  
Z. Kajcsos
Keyword(s):  
Positron Annihilation ◽  
Free Volume ◽  
Positron Lifetime ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
Positron Source ◽  
Lifetime Component ◽  
Positron Annihilation Lifetime ◽  
Long Lifetime

Positron annihilation lifetime spectroscopy was used to study the free-volume parameters in various pure -, - and -cyclodextrins samples and, in the case of β-cyclodextrin, with inclusion of S-carvone and thymoquinone. The results clearly indicate the presence of long lifetime components related to Ps-formation. The data show that the addition of S-carvone to β-cyclodextrin results in a decrease of o-Ps lifetime that we ascribe to a reduction of free volume holes from 81.8 to 63.7 Å3. The long lifetime component disappears when thymoquinone is added to -cyclodextrin, indicating this substance acts as an o-Ps quencher. For all samples studied, a decrease in the long lifetime component values was observed with increasing source in situ time, a result that might be attributed to the irradiation of the sample by the 22Na positron source.

Ceramide increases free volume voids in DPPC membranes

RSC Advances ◽  
2015 ◽  
Vol 5 (55) ◽  
pp. 44282-44290 ◽  
Author(s):  
E. Axpe ◽  
A. B. García-Arribas ◽  
J. I. Mujika ◽  
D. Mérida ◽  
A. Alonso ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Free Volume ◽  
Lipid Membranes ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
Positron Annihilation Lifetime

We have measured by positron annihilation lifetime spectroscopy (PALS) that ceramide increases the size of the free volume holes in DPPC lipid membranes.

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