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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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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...
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Anionic Chain-Growth Polymerization: Overview01:20

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Synthesis of Stimuli-responsive Nanogels using Aqueous One-step Crosslinking and Co-nanopolymerization
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A redox responsive polymeric gel based on ionic crosslinking.

Shih-To Fei1, Mwita V B Phelps1, Yang Wang1

  • 1Department of Chemistry, The Pennsylvania State University, University Park PA 16802, USA. hra@chem.psu.edu.

Soft Matter
|July 19, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel polymer hydrogel that changes size with electrical signals. This electrochemically responsive material, based on ionic crosslinking, offers potential for microrobotic and biomedical applications.

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Area of Science:

  • Polymer Science
  • Materials Chemistry
  • Electrochemistry

Background:

  • Ionic crosslinking is a common method for hydrogel formation.
  • Controlling hydrogel properties, such as swelling and contraction, is crucial for advanced applications.

Purpose of the Study:

  • To develop an electrochemically responsive polymer hydrogel.
  • To demonstrate reversible swelling-contraction behavior controlled by redox reactions.

Main Methods:

  • Synthesis of a polymer hydrogel utilizing ionic crosslinking with metal cations and anionic carboxylic acid side groups.
  • Application of redox reactions to control the dissociation and reformation of ionic crosslinks.

Main Results:

  • The polymer hydrogel exhibited electrochemically controlled crosslinking and de-crosslinking.
  • Reversible and localized swelling-contraction of the hydrogel was achieved through redox-triggered crosslink dynamics.
  • Demonstrated potential for biocompatible microrobotic and biomedical applications.

Conclusions:

  • An electrochemically responsive polymer hydrogel was successfully fabricated.
  • The material shows promise for applications requiring precise, electrically controlled actuation at the microscale.