Related Experiment Video
Updated: Sep 13, 2025
07:45
Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
Published on: August 16, 2018
10.1K
Polymer-Coordinated Heterogeneous Zeolitic Imidazolate Framework-8 with Exceptional Propylene/Propane Molecular
Sunghwan Park1,2, Ho Jin Jung3, Se Hun Kim3
1Artie McFerrin Department of Chemical Engineering and Department of Materials Science and Engineering, Texas A&M University, 3122 TAMU, College Station, TX, 77843-3122, USA.
Small (Weinheim an Der Bergstrasse, Germany)
|July 27, 2025
Summary
A new heterogeneous ZIF-8 material (hZIF-8) enhances propylene/propane separation by restricting linker flexibility. This novel material significantly boosts membrane performance for gas separation applications.
Area of Science:
- Materials Science
- Chemical Engineering
- Nanotechnology
Background:
- Zeolitic imidazolate framework-8 (ZIF-8) shows potential for C3H6/C3H8 separation.
- ZIF-8's flexible linkers limit its molecular sieving capabilities.
- Developing advanced materials for efficient gas separation is crucial.
Purpose of the Study:
- To develop a novel heterogeneous ZIF-8 (hZIF-8) material.
- To improve the molecular sieving properties of ZIF-8 for C3H6/C3H8 separation.
- To enhance the performance of mixed-matrix membranes (MMMs) for industrial gas separations.
Main Methods:
- Synthesized hZIF-8 via in situ coordination polymerization of tetrahydrofuran (THF) during ZIF-8 crystallization.
- Introduced polytetramethylene ether glycol (PTMEG) chains to restrict ZIF-8 linker flexibility.
- Fabricated hZIF-8-containing mixed-matrix membranes (MMMs).
Main Results:
- The heterogeneous structure of hZIF-8 effectively restricted linker flexibility.
- hZIF-8 MMMs showed a 468% increase in separation factor (13.3 to 75.5) and a 135% increase in C3H6 permeability (7.4 to 17.4 Barrer).
- Predicted intrinsic selectivity of hZIF-8 reached ≈3700, a significant improvement over pristine ZIF-8.
Conclusions:
- hZIF-8 demonstrates superior molecular sieving properties compared to conventional ZIF-8.
- The developed hZIF-8 is a highly promising material for advanced C3H6/C3H8 separation membranes.
- Coordination-mediated heterogeneous structures offer a new strategy for designing high-performance MOF-based materials.
Keywords:
C3H6/C3H8 separationcoordination polymersmetal‐organic frameworksmixed‐matrix membraneszeolitic imidazolate frameworksMore Related Videos
Related Concept Videos
01:17Ziegler–Natta Chain-Growth Polymerization: Overview
3.5K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.5K
02:18Conformations of Ethane and Propane
14.6K
In an organic molecule, free rotation about the carbon-carbon single bond results in energetically different conformers of the molecule. Due to this rotation, called the internal rotation, ethane has two major conformations — staggered and eclipsed.
Staggered conformation is a low energy and more stable conformation with the C-H bonds on the front carbon placed at 60°dihedral angles relative to the C-H bonds on the back carbon, leading to a reduced torsional strain. In staggered...
Staggered conformation is a low energy and more stable conformation with the C-H bonds on the front carbon placed at 60°dihedral angles relative to the C-H bonds on the back carbon, leading to a reduced torsional strain. In staggered...
14.6K
02:29Conformations of Cycloalkanes
12.2K
Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3 hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that...
12.2K
02:35Free-Radical Chain Reaction and Polymerization of Alkenes
8.2K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
8.2K
01:26Polymer Classification: Stereospecificity
2.6K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
2.6K
00:53Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)
2.0K
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
2.0K