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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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 basic...
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
Size-Exclusion Chromatography01:08

Size-Exclusion Chromatography

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.
Silica particles offer advantages such as rigidity,...
Gas Chromatography: Types of Columns and Stationary Phases01:17

Gas Chromatography: Types of Columns and Stationary Phases

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.
For an analyte to remain on the column for a sufficient amount of time, it must exhibit some level of compatibility (or...
Silica Gel Column Chromatography: Overview01:10

Silica Gel Column Chromatography: Overview

Silica gel column chromatography is a technique for separating compounds using a column packed with silica gel as the stationary phase. This method relies on differences in the polarity of compounds. Based on their polarities, compounds move between the stationary phase (silica gel) and the mobile phase (the solvent), forming discrete bands in the column.
Polar components tend to bind strongly to the silica gel, causing them to move slowly through the column. In contrast, nonpolar compounds...

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Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides
10:27

Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides

Published on: July 14, 2015

Polymeric ionic liquids as CO(2) selective sorbent coatings for solid-phase microextraction.

Qichao Zhao1, Jonathan C Wajert, Jared L Anderson

  • 1Department of Chemistry, The University of Toledo, 2801 West Bancroft Street, MS 602, Toledo, Ohio 43606, USA.

Analytical Chemistry
|December 30, 2009
PubMed
Summary
This summary is machine-generated.

New polymeric ionic liquid (PIL) coatings for solid-phase microextraction (SPME) show selective CO(2) extraction. These PIL-based fibers offer improved reproducibility and storage stability compared to commercial options.

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Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides
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Deposition of Porous Sorbents on Fabric Supports
05:58

Deposition of Porous Sorbents on Fabric Supports

Published on: June 12, 2018

Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Environmental Science

Background:

  • Solid-phase microextraction (SPME) is a widely used technique for sample preparation.
  • Developing selective sorbent materials is crucial for efficient analyte extraction.
  • Polymeric ionic liquids (PILs) offer tunable properties for advanced applications.

Purpose of the Study:

  • To synthesize and evaluate two novel polymeric ionic liquid (PIL) coatings for selective CO(2) extraction using SPME.
  • To compare the performance of PIL-based SPME fibers with commercial alternatives.
  • To investigate the mechanisms of CO(2) capture by different PIL functional groups.

Main Methods:

  • Synthesis of two PILs: poly(1-vinyl-3-hexylimidazolium) bis[(trifluoromethyl)sulfonyl]imide [poly(VHIM-NTf(2))] and poly(1-vinyl-3-hexylimidazolium) taurate [poly(VHIM-taurate)].
  • Application of PILs as sorbent coatings on SPME fibers.
  • Extraction efficiency comparison with commercial poly(dimethylsiloxane) (PDMS) and Carboxen-PDMS fibers.
  • Generation of calibration curves in pure CO(2) and assessment of linear range and reproducibility.
  • Evaluation of CO(2) sorbate retention under various storage conditions.

Main Results:

  • PIL-based SPME fibers demonstrated selective CO(2) extraction.
  • Poly(VHIM-NTf(2)) showed comparable CO(2) extraction efficiency to Carboxen-PDMS at high pressures, despite thinner films.
  • PIL coatings exhibited larger linear ranges and superior extraction-to-extraction reproducibility.
  • PIL-based coatings displayed enhanced CO(2) retention capabilities, especially poly(VHIM-taurate) via carbamate salt formation.

Conclusions:

  • Polymeric ionic liquids are effective sorbent materials for selective CO(2) extraction via SPME.
  • The functional groups in PILs influence CO(2) capture mechanisms and selectivity.
  • PIL-based SPME fibers offer advantages in sensitivity, reproducibility, and storage stability over conventional materials.