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Related Concept Videos

Colloids03:22

Colloids

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...
Colloids and Suspensions01:17

Colloids and Suspensions

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 visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
Colloidal precipitates01:09

Colloidal precipitates

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...
Coagulation01:06

Coagulation

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...
The Colloidal State01:29

The Colloidal State

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 the...
Factors Affecting Dissolution: Particle Size and Effective Surface Area01:23

Factors Affecting Dissolution: Particle Size and Effective Surface Area

Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are employed to...

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Related Experiment Video

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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 21, 2014

Colloidal Particles at Water-Glass Interface: Deposition Kinetics and Surface Heterogeneity

Lüthi1, Ricka, Borkovec

  • 1Institute of Applied Physics, University of Bern, Bern, Sidlerstrasse 5, 3012, Switzerland

Journal of Colloid and Interface Science
|October 8, 1998
PubMed
Summary
This summary is machine-generated.

Colloidal particle sorption on glass surfaces is not uniform. Dissolving glass continuously exposes new, transient adsorption sites, explaining complex sorption patterns observed via videomicroscopy.

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Published on: February 22, 2018

Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Physical Chemistry

Background:

  • Colloidal particle sorption is crucial in various applications.
  • Understanding surface heterogeneity is key to controlling sorption.
  • Previous studies often assumed homogeneous surfaces.

Purpose of the Study:

  • To investigate the sorption behavior of colloidal particles on a glass surface under flow.
  • To elucidate the mechanisms behind observed sorption patterns.
  • To challenge the assumption of surface homogeneity in sorption studies.

Main Methods:

  • Videomicroscopy combined with evanescent field illumination.
  • Experiments conducted in a parallel plate channel with colloidal particle suspension.
  • Analysis of particle sorption dynamics in the presence of electrostatic barriers.

Main Results:

  • Glass surfaces exhibit non-uniform sorption, with particles binding to preferred sites.
  • These sorption sites are dynamic, appearing and disappearing randomly.
  • A dissociation rate constant (kd) of 1.3 x 10^-5 s^-1 was determined for site disappearance.

Conclusions:

  • The observed dynamic sorption sites are explained by slow glass surface dissolution.
  • Dissolution exposes transient adsorbers from the bulk glass.
  • These transient sites are subsequently removed by the buffer flow, leading to dynamic sorption behavior.