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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...
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...
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

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Synthetic Methodology for Asymmetric Ferrocene Derived Bio-conjugate Systems via Solid Phase Resin-based Methodology
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Ion and solvent exchange processes in PGA/PAH polyelectrolyte multilayers containing ferrocyanide.

Raphael Zahn1, Fouzia Boulmedais, János Vörös

  • 1Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, University and ETH Zürich, Switzerland.

The Journal of Physical Chemistry. B
|February 27, 2010
PubMed
Summary

Electrochemical swelling of ferrocyanide-containing polyelectrolyte multilayers depends on buffer ion properties. This study reveals how ionic strength, pH, and counterion characteristics influence film swelling and ion exchange.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Physical Chemistry

Background:

  • Polyelectrolyte multilayers (PEMs) are versatile materials with tunable properties.
  • Incorporating redox-active species like ferrocyanide enables electrochemical control over PEM behavior.
  • Understanding ion exchange within PEMs is crucial for applications in sensing and separations.

Purpose of the Study:

  • To investigate the electrochemical swelling of poly(L-glutamic acid)/poly(allylamine)hydrochloride (PGA/PAH) PEMs containing ferrocyanide.
  • To elucidate the influence of buffer ionic properties on PEM swelling and ion exchange.
  • To develop a model explaining the relationship between buffer characteristics and PEM behavior.

Main Methods:

  • Electrochemical quartz crystal microbalance (EQCM) to monitor mass changes during swelling.
  • Infrared spectroscopy in attenuated total reflection (IR-ATR) to analyze film composition.
  • Systematic variation of buffer ionic strength, pH, and counterion type.

Main Results:

  • Ferrocyanide redox cycling induced reversible swelling of the PGA/PAH PEMs.
  • PEM swelling was strongly dependent on buffer ionic strength, pH, and counterion charge.
  • Monovalent anions followed the Hofmeister series for hydration, influencing swelling.
  • Divalent anions exhibited strong binding, leading to ferrocyanide release and deviating from the Hofmeister series.

Conclusions:

  • The electrochemical swelling of ferrocyanide-containing PEMs is governed by counterion and water exchange with the buffer.
  • Buffer properties, including ionic strength, pH, and counterion characteristics (hydration, binding affinity), dictate swelling behavior.
  • The findings provide insights into designing responsive PEMs for electrochemical applications.