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Related Concept Videos

Colloids03:22

Colloids

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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 precipitates01:09

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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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Colloids and Suspensions01:17

Colloids and Suspensions

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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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Methods for the Self-integration of Megamolecular Biopolymers on the Drying Air-LC Interface
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Microstructures and mechanics in the colloidal film drying process.

Mu Wang1, John F Brady

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA. mwwang@caltech.edu jfbrady@caltech.edu.

Soft Matter
|October 28, 2017
PubMed
Summary

Interface motion critically influences colloidal film drying. Brownian Dynamics simulations reveal how Péclet number controls microstructure, leading to crystallization or amorphous films, and affects stress profiles during drying.

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Area of Science:

  • Colloid Science
  • Materials Science
  • Computational Physics

Background:

  • Colloidal film drying is crucial for material fabrication.
  • Understanding microstructural evolution and mechanical properties during drying is essential.
  • Confined colloidal suspensions present unique challenges for modeling.

Purpose of the Study:

  • To investigate the impact of interface motion on colloidal film microstructures and mechanics.
  • To develop and validate computational tools for studying confined drying processes.
  • To elucidate the relationship between drying conditions and final film properties.

Main Methods:

  • Brownian Dynamics (BD) simulations with a novel Energy Minimization Potential-Free (EMPF) algorithm.
  • Continuum models for comparative analysis.
  • Study of interface motion under constant velocity and constant imposed stress.
  • Analysis of Péclet numbers (PeU and PeΣ) to characterize drying regimes.

Main Results:

  • Thermodynamics dominates at low Péclet numbers (PeU ≪ 1), leading to homogeneous crystallization.
  • Epitaxial crystal growth occurs at high Péclet numbers (PeU ≫ 1).
  • Amorphous microstructures are observed at moderate Péclet numbers, with stress profiles becoming step-like as Péclet number increases.

Conclusions:

  • Interface motion is a critical factor determining colloidal film microstructure and stress.
  • BD simulations accurately capture stress and resolve distributions for low to moderate Péclet numbers.
  • The findings provide insights into controlling film properties through drying dynamics.