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Related Concept Videos

The Colloidal State01:29

The Colloidal State

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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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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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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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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
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Polyelectrolyte adsorption, interparticle forces, and colloidal aggregation.

Istvan Szilagyi1, Gregor Trefalt, Alberto Tiraferri

  • 1Department of Inorganic and Analytical Chemistry, University of Geneva, Sciences II, Quai Ernest-Ansermet 30, 1205 Geneva, Switzerland. michal.borkovec@unige.ch.

Soft Matter
|March 21, 2014
PubMed
Summary
This summary is machine-generated.

Polyelectrolyte adsorption onto charged surfaces forms layers that influence colloidal particle interactions. Surface charge, salt concentration, and film homogeneity dictate stability, explained by Derjaguin, Landau, Verwey, and Overbeek (DLVO) theory.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Physical Chemistry

Background:

  • Polyelectrolyte adsorption on solid substrates is crucial for controlling colloidal system behavior.
  • Understanding interaction forces is key to predicting colloidal particle aggregation.
  • Existing theories require refinement for heterogeneous polyelectrolyte films.

Purpose of the Study:

  • To review the current understanding of polyelectrolyte adsorption on charged surfaces.
  • To elucidate the interaction forces between coated substrates.
  • To explain the consequences for colloidal particle aggregation.

Main Methods:

  • Literature review of experimental findings on polyelectrolyte adsorption.
  • Analysis of surface forces and interactions based on adsorption characteristics.
  • Application and evaluation of the Derjaguin, Landau, Verwey, and Overbeek (DLVO) theory.

Main Results:

  • Polyelectrolytes irreversibly adsorb to form monolayers, often leading to charge reversal and heterogeneous films.
  • Adsorbed film properties (thickness, homogeneity) vary with salt concentration.
  • Interaction forces shift from repulsive (low salt) to attractive (high salt), influencing colloidal stability.

Conclusions:

  • Adsorption is irreversible, forming monolayers with significant charge reversal.
  • Salt concentration modulates film properties and interaction forces, impacting colloidal stability.
  • DLVO theory provides a framework, but heterogeneous films may involve additional patch-charge and depletion interactions.