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Related Concept Videos

Redox Reactions01:24

Redox Reactions

Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
Ladder Diagrams: Redox Equilibria01:30

Ladder Diagrams: Redox Equilibria

Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
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...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Ionic Strength: Overview01:12

Ionic Strength: Overview

The ionic strength of a solution is a quantitative way of expressing the total electrolyte concentration of a solution. This concept was first introduced in 1921 by two American physical chemists, Gilbert N. Lewis and Merle Randall, while describing the activity coefficient of strong electrolytes. During the calculation of ionic strength (I or μ), all the cations and anions are considered. However, the concentration (c) of an ion with a greater charge number (z) has a greater contribution to...
Balancing Redox Equations02:58

Balancing Redox Equations

Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Published on: August 2, 2012

Redox, Ionic Strength, and pH Sensitive Supramolecular Polymer Assemblies.

Suhrit Ghosh1, Volkan Yesilyurt, Elamprakash N Savariar

  • 1Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003.

Journal of Polymer Science. Part A, Polymer Chemistry
|January 12, 2010
PubMed
Summary
This summary is machine-generated.

Researchers created novel micelle-like structures using cationic surfactants and disulfide polyelectrolytes. These supramolecular complexes can be stimulus-responsively disassembled, offering new possibilities for controlled material behavior.

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Area of Science:

  • Supramolecular chemistry
  • Polymer science
  • Colloid and surface chemistry

Background:

  • Cationic surfactants and oppositely charged polyelectrolytes can form supramolecular complexes.
  • These complexes can exhibit unique aggregate structures and properties.
  • Understanding the formation and disassembly of these complexes is crucial for material design.

Purpose of the Study:

  • To investigate the formation of micelle-type aggregates from a cationic surfactant and a disulfide-containing polyelectrolyte.
  • To demonstrate the stimulus-sensitive disassembly of these supramolecular complexes.
  • To explore methods for controlling the disassembly process using various stimuli.

Main Methods:

  • Formation of supramolecular complexes between a cationic surfactant and a disulfide-containing polyelectrolyte.
  • Characterization of aggregate formation at concentrations below the surfactant's critical aggregate concentration (CAC).
  • Application of three different stimuli to induce disassembly of the formed structures.

Main Results:

  • Supramolecular complexes formed micelle-type aggregates at significantly lower concentrations than the surfactant's CAC.
  • Stimulus-responsive disassembly of these aggregates was successfully achieved.
  • Disassembly was triggered by modifying polyelectrolyte counterions or weakening polymer-surfactant interactions.

Conclusions:

  • The study successfully demonstrates the formation of low-concentration, micelle-like aggregates from cationic surfactants and disulfide polyelectrolytes.
  • The developed supramolecular systems exhibit tunable, stimulus-sensitive disassembly.
  • These findings open avenues for creating responsive materials and controlled release systems.