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Related Concept Videos

Ionic Association01:28

Ionic Association

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.
Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
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...
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...

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Related Experiment Video

Updated: Jun 20, 2026

Assembly and Characterization of Polyelectrolyte Complex Micelles
08:44

Assembly and Characterization of Polyelectrolyte Complex Micelles

Published on: March 2, 2020

Polyelectrolyte synthesis and in situ complex formation in ionic liquids.

Martin Gericke1, Tim Liebert, Thomas Heinze

  • 1Centre of Excellence for Polysaccharide Research, Friedrich Schiller University of Jena, D-07743 Jena, Germany.

Journal of the American Chemical Society
|September 17, 2009
PubMed
Summary

New polyelectrolyte complex (PEC) capsules were created using cellulose sulfates (CSs) in ionic liquids (ILs). These stable, hollow capsules are ideal for enzyme reactions and can be made efficiently in a single step.

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Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators
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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
11:04

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Published on: December 20, 2016

Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biotechnology

Background:

  • Cellulose sulfates (CSs) are typically water-insoluble, limiting their use in capsule fabrication.
  • Polyelectrolyte complex (PEC) capsules are valuable for applications like enzyme immobilization.
  • Ionic liquids (ILs) offer unique solvent properties for polymer processing.

Purpose of the Study:

  • To develop a novel method for preparing PEC capsules using water-insoluble cellulose sulfates (CSs) with low degrees of substitution (DS).
  • To investigate the properties and stability of these CS-based PEC capsules.
  • To demonstrate the feasibility of using these capsules for enzyme encapsulation and reactions.

Main Methods:

  • Preparation of cellulose sulfates (CSs) with DS < 0.2 in ionic liquids (ILs).
  • Formation of PEC capsules through interaction with the polycation poly(dimethyldiallyammonium chloride).
  • Characterization of capsule morphology (outer shell, hollow core) and stability.
  • Encapsulation of glucose oxidase to assess functionality.

Main Results:

  • Successfully prepared PEC capsules from water-insoluble CSs (DS < 0.2) in ILs for the first time.
  • The resulting capsules were free of residual IL and exhibited a distinct core-shell structure.
  • Enhanced capsule stability was observed due to the reestablished hydrogen bond system in low-substituted CS.
  • Demonstrated efficient single-pot preparation combining CS synthesis, PEC capsule formation, and enzyme encapsulation.

Conclusions:

  • Ionic liquids enable the fabrication of stable polyelectrolyte complex capsules from water-insoluble cellulose sulfates.
  • The developed method offers a cost-effective and time-efficient approach for producing enzyme-loaded capsules.
  • These novel CS-based PEC capsules show significant potential for applications in biocatalysis and controlled release systems.