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Related Concept Videos

The Colloidal State01:29

The Colloidal State

153
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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Colloidal precipitates01:09

Colloidal precipitates

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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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Colloids03:22

Colloids

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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...
22.1K
Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

7.2K
In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
7.2K
Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

6.0K
Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
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Types of Coprecipitation01:10

Types of Coprecipitation

7.0K
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.
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Crack formation and prevention in colloidal drops.

Jin Young Kim1, Kun Cho1, Seul-A Ryu1

  • 1Soft Matter Physics Laboratory, School of Advanced Materials Science and Engineering, SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 440-746, Korea.

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Crack formation in colloidal films can be prevented by controlling nanoparticle interactions. Adding a non-adsorbing polymer induces gelation, leading to crack-free coatings in industrial applications.

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Area of Science:

  • Materials Science
  • Colloid Science
  • Nanotechnology

Background:

  • Residual stress during colloidal film formation from evaporating droplets often leads to cracks.
  • Crack prevention is crucial for industrial applications like painting and inkjet printing.

Purpose of the Study:

  • To investigate the mechanisms of crack formation during colloidal droplet evaporation.
  • To develop a method for preventing cracks in nanoparticle-based colloidal films.

Main Methods:

  • Direct visualization of colloid evaporation using confocal laser microscopy.
  • Analysis of crack generation dependence on particle size and initial volume fraction.
  • Introduction of non-adsorbing polymers to control colloid-polymer interactions.

Main Results:

  • Crack formation is influenced by particle size and initial volume fraction.
  • Mixing non-adsorbing polymers with colloidal suspensions drives gelation.
  • Gelation effectively prevents crack formation, yielding uniform coatings.

Conclusions:

  • Gelation-driven crack prevention is a versatile and effective method.
  • This approach offers a simple solution for producing crack-free colloidal nanoparticle coatings.
  • The findings are applicable to various industrial processes involving colloidal films.