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Solubility of Ionic Compounds

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Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
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Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
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Electrolyte and Nonelectrolyte Solutions02:21

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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Light-Controllable Ionic Conductivity in a Polymeric Ionic Liquid.

Hui Nie1, Nicole S Schauser2, Neil D Dolinski2

  • 1Department of Chemistry and Biochemistry, University of California-Santa Barbara, Santa Barbara, CA, 93106, USA.

Angewandte Chemie (International Ed. in English)
|January 12, 2020
PubMed
Summary
This summary is machine-generated.

New polymeric ionic liquids (PILs) change conductivity with light. UV light reduces conductivity by 70%, while visible light restores it, enabling light-controlled electronic devices.

Keywords:
cation-anion interactionsdiaryletheneionic conductivityphotoswitchespolymeric ionic liquids

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Polymeric ionic liquids (PILs) offer high stability and mechanical durability for advanced electrolytes.
  • Light-responsive materials enable remote, noninvasive control for future technologies.

Purpose of the Study:

  • To design and synthesize novel PIL materials with light-mediated conductivity changes.
  • To investigate the mechanism of conductivity modulation via photoswitching.

Main Methods:

  • Incorporation of diarylethene units into PIL structures.
  • Characterization of conductivity changes upon UV and visible light irradiation.
  • Analysis of cationic character modulation in imidazolium bridging units.

Main Results:

  • A reversible, light-induced conductivity drop of approximately 70% in solid-state PILs.
  • Demonstration of spatiotemporal and reversible patterning of PIL films using light.
  • Successful tuning of cationic character through diarylethene photoswitching.

Conclusions:

  • Developed light-responsive PILs with tunable ionic conductivity.
  • Potential applications in light-controlled electrical circuits and wearable photodetectors.
  • Highlights the utility of diarylethene units for creating advanced functional materials.