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Related Concept Videos

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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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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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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In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
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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.
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Related Experiment Video

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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
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Heterogeneous interface adsorption of colloidal particles.

Dong Woo Kang1, Jin Hyun Lim, Bum Jun Park

  • 1Department of Chemical Engineering, Kyung Hee University, Yongin, Gyeonggi-do 17104, South Korea. bjpark@khu.ac.kr.

Soft Matter
|August 15, 2017
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Summary
This summary is machine-generated.

Charged colloidal particle adsorption to oil-water interfaces is stochastic, not deterministic. Particle surface heterogeneity influences adsorption probability, impacting emulsion stability.

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Area of Science:

  • Colloid and Surface Science
  • Physical Chemistry
  • Materials Science

Background:

  • Understanding charged colloidal particle adsorption at interfaces is crucial for applications like emulsion stabilization.
  • The adsorption process is often assumed to be deterministic, but experimental evidence is needed.

Purpose of the Study:

  • To quantitatively and statistically investigate the heterogeneous adsorption behaviors of charged colloidal particles at oil-water interfaces.
  • To elucidate the stochastic nature of particle adsorption and its dependence on ionic strength and holding time.

Main Methods:

  • Utilizing optical laser tweezers to manipulate charged colloidal particles near oil-water interfaces.
  • Measuring adsorption probability as a function of ionic strength and particle holding time at the interface.

Main Results:

  • Adsorption probability decreases logarithmically with decreasing ionic strength.
  • Adsorption probability is dependent on the holding time, indicating a stochastic process.
  • Demonstrated consistency between interfacial adsorption properties and bulk emulsion stability.

Conclusions:

  • Particle adsorption to oil-water interfaces is a stochastic process, attributed to surface heterogeneity of colloidal particles.
  • Ionic strength and holding time are critical factors influencing adsorption probability.
  • Findings provide insights into the mechanisms governing particle-stabilized emulsions.