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Related Concept Videos

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...
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...
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...
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...
Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
Solubility03:00

Solubility

Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...

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Related Experiment Video

Updated: Jun 14, 2026

Methods for the Self-integration of Megamolecular Biopolymers on the Drying Air-LC Interface
07:06

Methods for the Self-integration of Megamolecular Biopolymers on the Drying Air-LC Interface

Published on: April 7, 2017

Drying of complex suspensions.

Lei Xu1, Alexis Bergès, Peter J Lu

  • 1Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong.

Physical Review Letters
|April 7, 2010
PubMed
Summary
This summary is machine-generated.

Large emulsion droplets collapse during drying, expelling contents into particle networks. Small droplets deform but remain intact, a behavior predicted by a model coupling Laplace pressure and Darcy's law.

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Area of Science:

  • Colloid and interface science
  • Materials science
  • Fluid dynamics

Background:

  • Understanding drying dynamics of complex fluids is crucial for material fabrication.
  • Emulsion droplets and colloidal particles form intricate mixtures with unique properties.

Purpose of the Study:

  • Investigate the 3D structure and drying behavior of emulsion droplet-colloidal particle mixtures.
  • Determine the factors influencing droplet collapse and content expulsion during drying.
  • Develop a model to predict drying dynamics and create novel hierarchical structures.

Main Methods:

  • Confocal microscopy to visualize 3D structures and drying processes.
  • Experimental manipulation of emulsion droplet size and particle packing.
  • Theoretical modeling combining Laplace pressure and Darcy's law.

Main Results:

  • Large emulsion droplets rapidly collapse upon air invasion, expelling contents into the porous particle network.
  • The rate of content expulsion is proportional to the square of the droplet radius.
  • Small droplets do not collapse but deform, remaining intact.
  • A model accurately predicts the critical droplet radius for collapse and the evacuation rate.

Conclusions:

  • Drying dynamics are governed by a competition between droplet stability and capillary forces.
  • The developed model provides a predictive framework for droplet behavior in porous media.
  • These findings enable the fabrication of novel hierarchical structures using controlled drying processes.