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Ion Exchange01:17

Ion 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...
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Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

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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...
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Intermolecular Forces03:13

Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Ionic Association01:28

Ionic Association

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The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Poly(dimethylsiloxane)-supported ionogels with a high ionic liquid loading.

Ariel I Horowitz1, Matthew J Panzer

  • 1Department of Chemical and Biological Engineering, Tufts University, 4 Colby Street, Medford, MA 02155 (USA) http://ase.tufts.edu/genelab/home.html.

Angewandte Chemie (International Ed. in English)
|July 22, 2014
PubMed
Summary
This summary is machine-generated.

Researchers developed flexible, high-performance ionogels by overcoming poly(dimethylsiloxane) (PDMS) and ionic liquid (IL) immiscibility. These PDMS-supported IL gels offer excellent conductivity and mechanical stability for advanced applications.

Keywords:
composite materialsgelsionic liquidssol-gel processessolid electrolytes

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Electrochemistry

Background:

  • Poly(dimethylsiloxane) (PDMS) and ionic liquids (ILs) are immiscible, hindering the development of advanced composite materials.
  • Ionic gels (ionogels) are promising for energy storage and flexible electronics, but often suffer from poor mechanical properties or limited IL loading.

Purpose of the Study:

  • To overcome the immiscibility of PDMS and ILs to create stable, high-performance ionogels.
  • To investigate the influence of IL/scaffold chemical interactions on the electrical properties of ionogels.

Main Methods:

  • A simple room-temperature sol-gel reaction involving a functionalized PDMS oligomer, formic acid, and an IL or lithium-in-IL solution.
  • Casting the resulting resin to form freestanding, flexible ionogel films.
  • Characterization of ionic conductivity, mechanical behavior (elastic modulus, fatigue life), and thermal stability.

Main Results:

  • Achieved high IL loadings (up to 80% by mass) in PDMS-supported ionogels.
  • Demonstrated favorable ionic conductivity (ca. 3 mS cm⁻¹).
  • Exhibited excellent mechanical properties: elastic modulus (ca. 60 kPa), fatigue life (>5000 cycles), and thermal stability (up to 200°C).

Conclusions:

  • The developed PDMS-supported ionogels offer a promising platform for flexible electronic applications.
  • The activation energy of ionic conductivity in the ionogel closely matches that of the neat IL, suggesting minimal IL/scaffold chemical interaction.
  • Understanding IL/scaffold chemical interactions is crucial for optimizing ionogel electrical performance, particularly at elevated temperatures.