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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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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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Ion-Exchange Chromatography01:09

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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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Capillary Electrophoresis: Applications01:30

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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
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Capillary Electrophoresis: Instrumentation01:20

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Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...
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Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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Cross-Linked Polyelectrolyte for Improved Selectivity and Processability of Iontronic Systems.

Theresia Arbring Sjöström1, Amanda Jonsson1, Erik Gabrielsson1

  • 1Laboratory of Organic Electronics, Department of Science and Technology, Linköping University , 601 74 Norrköping, Sweden.

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Summary

Researchers developed a new ion exchange membrane (IEM) for on-demand biomolecule release in neuromodulation. This advanced material offers improved processability and superior cation selectivity for next-generation therapies.

Keywords:
ion exchange membranesiontronicsmicrofabricationneurotransmitter releaseorganic bioelectronics

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Area of Science:

  • Biomaterials Science
  • Neuroscience
  • Chemical Engineering

Background:

  • On-demand local release of biomolecules is crucial for advanced neuromodulation therapies.
  • Iontronic devices utilizing ion exchange membranes (IEMs) enable precise chemical stimulation.
  • Current thin-film IEMs face limitations in processability and performance, hindering technological progress.

Purpose of the Study:

  • To develop a novel cationic ion exchange membrane (IEM) with enhanced processability and ionic selectivity.
  • To overcome existing limitations in thin-film IEMs for iontronic devices.
  • To create a material compatible with in vitro cell studies for neuromodulation applications.

Main Methods:

  • Fabrication of a poly(4-styrenesulfonic acid-co-maleic acid) (PSS-co-MA) based cationic IEM.
  • Cross-linking the PSS-co-MA with polyethylene glycol (PEG) to improve material properties.
  • Evaluation of the IEM's processability, ionic selectivity, and compatibility with in vitro cell studies.

Main Results:

  • Successfully developed a processable cationic IEM using PSS-co-MA cross-linked with PEG.
  • The novel PSS-co-MA/PEG IEM demonstrated superior cation selectivity compared to previously used materials.
  • The developed IEM exhibits enhanced compatibility for in vitro cell studies.

Conclusions:

  • The PSS-co-MA/PEG IEM offers a promising solution for advanced iontronic devices in neuromodulation.
  • Improved processability and selectivity of this new IEM open new design possibilities.
  • This material advancement supports the development of next-generation, fine-tuned neuromodulation therapies.