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Related Concept Videos

Electrodeposition01:08

Electrodeposition

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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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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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...
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Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

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After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
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Types of Coprecipitation01:10

Types of Coprecipitation

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Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
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Electrochemical Roughening of Thin-Film Platinum Macro and Microelectrodes
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Crater Formation on Electrodes during Charge Transfer with Aqueous Droplets or Solid Particles.

E S Elton1, E R Rosenberg1, W D Ristenpart1

  • 1Department of Chemical Engineering, University of California Davis, Davis, California 95616, USA.

Physical Review Letters
|September 27, 2017
PubMed
Summary

Metallic electrodes develop physical pits during charge transfer events in strong electric fields. This crater formation, caused by localized melting and dielectric breakdown, explains challenges in verifying Maxwell

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Area of Science:

  • Physics
  • Materials Science
  • Electrochemistry

Background:

  • Understanding charge transfer phenomena is crucial in various electrical applications.
  • Previous research has not fully explained electrode degradation during high electric field interactions.
  • Maxwell's predictions regarding charge acquisition by electrodes remain difficult to corroborate experimentally.

Purpose of the Study:

  • To investigate the physical mechanisms behind electrode damage during charge transfer events.
  • To explain the observed pitting on metallic electrodes under strong electric fields.
  • To provide a potential resolution for discrepancies in verifying Maxwell's electrostatic theories.

Main Methods:

  • Experimental observation of charge transfer events between metallic electrodes and conductive objects (e.g., water droplets).
  • Microscopic analysis (post situ) of electrode surfaces to characterize pit morphology.
  • Development of a theoretical model and scaling analysis to explain crater formation.

Main Results:

  • Metallic electrodes exhibit physical pitting (1-3 μm craters) after individual charge transfer events in electric fields exceeding 1 kV/cm.
  • Crater formation is attributed to localized resistive heating and dielectric breakdown of the surrounding fluid.
  • Crater diameter scales with the inverse cube root of the metal's melting point, consistent across various metals.

Conclusions:

  • The described crater formation mechanism offers a physical explanation for electrode pitting.
  • This phenomenon provides a plausible reason for the difficulties in quantitatively verifying Maxwell's predictions.
  • The findings contribute to a deeper understanding of electrode-fluid interactions in strong electric fields.