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Related Concept Videos

Size-Exclusion Chromatography01:08

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In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
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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...
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Gas chromatography (GC) relies on stationary phases to separate and analyze components in a sample. There are two main types of stationary phases: liquid and solid. Liquid stationary phases are non-volatile, thermally stable, and chemically inert liquids coated onto the column. Solid stationary phases are particles of adsorbent material, such as silica gel or molecular sieves.
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Highly size-selective ionically crosslinked multilayer polymer films for light gas separation.

Daejin Kim1, Ping Tzeng, Kevin J Barnett

  • 1Artie McFerrin Department of Chemical Engineering, Texas A&M University, 3122 TAMU, College Station, TX, 77843-3122, United States.

Advanced Materials (Deerfield Beach, Fla.)
|December 3, 2013
PubMed
Summary

Researchers developed a novel multilayer polymer thin film for exceptional hydrogen separation. This advanced material surpasses the performance of existing polymeric and inorganic systems in hydrogen permselectivity.

Keywords:
Layer-by-layer assemblygas separationhydrogen purification

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Membrane Technology

Background:

  • Polymeric and inorganic membranes are commonly used for gas separation.
  • Achieving high hydrogen permselectivity remains a significant challenge in membrane technology.
  • Existing materials often face trade-offs between selectivity and permeability.

Purpose of the Study:

  • To develop a novel thin film material with exceptionally high hydrogen permselectivity.
  • To investigate the potential of ionically crosslinked multilayer polymer films for hydrogen separation.
  • To surpass the performance benchmarks set by current polymeric and porous inorganic systems.

Main Methods:

  • Fabrication of an ionically crosslinked multilayer polymer thin film.
  • Characterization of the film's structure and morphology.
  • Testing of the film's hydrogen permselectivity and permeability.

Main Results:

  • The developed thin film exhibited exceptionally high hydrogen permselectivity.
  • Performance exceeded that of all previously reported polymeric and porous inorganic systems.
  • The ionically crosslinked multilayer structure was key to the enhanced performance.

Conclusions:

  • Ionically crosslinked multilayer polymer thin films represent a breakthrough in hydrogen separation technology.
  • This novel material offers a promising solution for efficient hydrogen purification.
  • The findings pave the way for advanced membrane applications in hydrogen energy systems.