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Related Concept Videos

Coagulation01:06

Coagulation

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Colloidal precipitates01:09

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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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Taming Electrowetting Using Highly Concentrated Aqueous Solutions.

Athanasios A Papaderakis1,2, Kacper Polus1,3, Pallav Kant4

  • 1Department of Chemistry, University of Manchester, Oxford Road, ManchesterM13 9PL, United Kingdom.

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces
|December 23, 2022
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Summary
This summary is machine-generated.

Highly concentrated electrolytes enable reversible control of carbon surface wetting via electrowetting. This breakthrough enhances aqueous energy storage and microfluidic devices.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Surface Science

Background:

  • Wetting of carbon surfaces is a fundamental phenomenon crucial for energy storage and filtration.
  • Electrowetting offers a method to control wetting properties by applying an electrical potential.

Purpose of the Study:

  • To investigate electrowetting directly on graphitic surfaces using aqueous electrolytes.
  • To understand and achieve reversible control over wetting properties.
  • To explore the application of concentrated electrolytes for enhanced electrowetting.

Main Methods:

  • Studying electrowetting on graphitic surfaces with aqueous electrolytes.
  • Utilizing interfacial capacitance models for quantitative understanding.
  • Investigating the effect of electrolyte concentration and applied potential.
  • Extending the approach to liquid-liquid interfaces.

Main Results:

  • Achieved reversible control of wetting on carbon surfaces using electrowetting.
  • Demonstrated stable and reversible wetting behavior within a 2.8 V potential window using highly concentrated electrolytes.
  • Identified the applicability and limitations of classical Young-Lippmann models.
  • Showcased electrowetting at liquid|liquid interfaces with reduced potential thresholds.

Conclusions:

  • Highly concentrated aqueous electrolytes significantly enhance the electrowettability of carbon surfaces.
  • This approach offers a pathway for improved performance in carbon-based energy storage and microfluidic devices.
  • The study provides a quantitative understanding of electrowetting phenomena on graphitic materials.