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Related Concept Videos

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 fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
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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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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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A Navier-Stokes phase-field crystal model for colloidal suspensions.

Simon Praetorius1, Axel Voigt1

  • 1Institute of Scientific Computing, Technische Universität Dresden, D-01062 Dresden, Germany.

The Journal of Chemical Physics
|April 24, 2015
PubMed
Summary

We present a continuous model for colloidal suspensions, coupling crystal shape and flow dynamics. This computational tool aids understanding of colloidal crystallization in dynamic environments.

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Area of Science:

  • Fluid dynamics
  • Materials science
  • Computational physics

Background:

  • Colloidal suspensions are complex systems where particle interactions and fluid flow are intricately linked.
  • Existing models often struggle to capture the full interplay between particle dynamics and continuous fluid phases.
  • Understanding colloidal crystallization under flow is crucial for applications ranging from manufacturing to biological systems.

Purpose of the Study:

  • To develop a unified, fully continuous computational model for colloidal suspensions incorporating hydrodynamic interactions.
  • To analyze the bidirectional coupling between colloidal crystal morphology and the surrounding flow field.
  • To validate the model against established computational methods for particulate flow.

Main Methods:

  • Development of the Navier-Stokes Phase-Field Crystal model, integrating dynamic density functional theory with particulate flow concepts.
  • Detailed derivation and comparison with existing dynamic density functional theory approaches.
  • Numerical solution using adaptive finite element methods.
  • Validation against other computational approaches for colloidal sedimentation.

Main Results:

  • The model successfully captures the strong, bidirectional coupling between colloidal crystal shape and flow field in dynamic environments.
  • Demonstrated ability to simulate colloidal crystallization processes under various flow conditions.
  • Model validation confirmed accuracy for colloidal sedimentation problems.

Conclusions:

  • The Navier-Stokes Phase-Field Crystal model offers a robust framework for simulating colloidal suspensions with hydrodynamic interactions.
  • This approach provides new insights into the complex dynamics of colloidal crystallization in flowing systems.
  • The validated model serves as a valuable tool for further research in particulate flow and materials self-assembly.