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The Colloidal State01:29

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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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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...
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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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Measuring and Modeling Contractile Drying in Human Stratum Corneum
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Stratification Dynamics in Drying Colloidal Mixtures.

Michael P Howard1, Arash Nikoubashman2, Athanassios Z Panagiotopoulos1

  • 1Department of Chemical and Biological Engineering, Princeton University , Princeton, New Jersey 08544, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 29, 2017
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Summary
This summary is machine-generated.

Small colloids rise to the top of films, while large ones sink, creating inverted stratification in binary colloidal mixtures. This phenomenon depends on particle size ratios and drying rates.

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Area of Science:

  • Soft Matter Physics
  • Colloidal Science
  • Materials Science

Background:

  • Colloidal mixtures exhibit complex stratification behaviors during drying.
  • Previous studies observed unusual "inverted" stratification in binary colloidal systems.

Purpose of the Study:

  • To investigate the mechanism of inverted stratification in binary colloidal mixtures.
  • To systematically study the effects of particle size ratio and drying rate (Péclet number) on stratification dynamics.

Main Methods:

  • Implicit-solvent molecular dynamics simulations were employed.
  • Systematic variation of particle size ratios and film Péclet numbers.
  • Quantification of stratification dynamics and layer growth.

Main Results:

  • Inverted stratification (small particles on top, large on bottom) occurs for large size ratios and high Péclet numbers (>1).
  • The stratified layer of small colloids grows faster and thicker with increasing size ratios.
  • Inverted stratification persists at moderate Péclet numbers (~1), but with reduced layer thickness.

Conclusions:

  • Particle size ratio and drying rate are critical factors governing inverted stratification.
  • A dynamical density functional theory model is proposed to explain the observed stratification phenomena.
  • The findings provide insights into controlling colloidal self-assembly during drying processes.