Related Experiment Video
Updated: Apr 28, 2026
07:45
Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
Published on: August 16, 2018
9.7K
Deriving a CO2-permselective carbon membrane from a multilayered matrix of polyion complexes
Xinwei Chen1, Kian Guan Khoo, Min Woo Kim
1Department of Chemical & Biomolecular Engineering, National University of Singapore , Singapore 117585, Singapore.
ACS Applied Materials & Interfaces
|June 7, 2014
Summary
A novel carbon membrane precursor was developed using polyion complexes on ceramic. This method yields a highly selective CO2/CH4 separation membrane with excellent CO2 permeability.
Area of Science:
- Materials Science
- Chemical Engineering
- Membrane Technology
Background:
- Developing advanced carbon membranes (CMs) is crucial for efficient gas separation.
- Existing methods often face challenges with defect control and selectivity.
Purpose of the Study:
- To create a unique precursor for carbon membranes using a multilayered assembly.
- To investigate the gas separation performance of the resulting carbon membranes.
Main Methods:
- In situ polymerization of N-methylpyrrole (mPy) over poly(4-styrenesulfonic acid) (PSSA) on porous ceramic.
- Utilizing cetyltrimethylammonium bromide (CTAB) to enhance polymer infiltration.
- Pyrolysis of the precursor to form a carbon composite matrix.
Main Results:
- The multilayered assembly effectively formed a carbon composite matrix upon pyrolysis.
- The least graphitized carbon matrix showed superior CO2/CH4 selectivity (167) and CO2 permeability (7.19 Barrer).
- Imine and imide groups in the carbon skeleton act as selective CO2 adsorption sites.
Conclusions:
- The developed polyion complex precursor is effective for fabricating high-performance carbon membranes.
- Controlled graphitization is key to optimizing gas separation properties.
- The unique structure facilitates selective CO2 capture.
Related Concept Videos
01:15Potentiometry: Membrane Electrodes
2.2K
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
2.2K
01:17Ion Exchange
1.6K
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
1.6K
01:15Dialysis
2.1K
Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
2.1K
01:41The Supercomplexes in the Crista Membrane
2.2K
The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...
2.2K
01:45Mitochondrial Membranes
11.7K
A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
11.7K