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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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Recrystallization: Solid–Solution Equilibria01:10

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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Crystal Growth: Principles of Crystallization01:25

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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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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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The Colloidal State01:29

The Colloidal State

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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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Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

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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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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Energy landscapes for interfacial colloidal crystallization on three-dimensional surface topographies.

Dong Woo Kim1, Michael A Bevan1

  • 1Chemical & Biomolecular Engineering, Johns Hopkins University, Baltimore, MD 21218 USA.

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|May 16, 2025
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Summary

Researchers designed conditions for interfacial colloidal crystallization on 3D surfaces by measuring and modeling particle interactions. This work advances understanding of colloidal crystal formation on complex fluid-solid interfaces, yielding unique crystal morphologies.

Keywords:
Colloidal assemblyCurved surfacesDepletion interactionsGeometric frustrationInterfacial phase behaviorSedimentation equilibria

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Area of Science:

  • Colloid and surface science
  • Materials science
  • Soft matter physics

Background:

  • Interfacial colloidal crystallization is crucial for materials assembly but challenging on complex 3D surfaces.
  • Understanding particle interactions with surfaces, solutions, and gravity is key to designing crystallization conditions.
  • Previous studies focused on neutrally buoyant particles, with less progress on fluid-solid interfaces.

Purpose of the Study:

  • To measure and model interactions controlling interfacial colloidal crystallization on 3D surface topographies.
  • To design conditions for crystallization on surfaces with varying elevation and curvature.
  • To explore crystallization of diverse colloidal materials and sizes.

Main Methods:

  • Direct measurement of particle interactions.
  • Modeling of potential energy landscapes (buoyancy, electrostatics, depletion).
  • Systematic variation of surface topography, colloidal materials, and solvent mixtures.

Main Results:

  • Demonstrated interfacial colloidal crystallization on 3D surfaces without density or refractive index matching.
  • Identified key interactions (buoyancy, electrostatics, depletion) governing crystallization.
  • Achieved unique crystal morphologies dependent on particle properties and gravitational/pair interaction balance.

Conclusions:

  • Interfacial colloidal crystallization on 3D surfaces is achievable by carefully balancing multiple interaction forces.
  • The study provides a framework for designing crystallization conditions on complex fluid-solid interfaces.
  • Findings enable the creation of novel colloidal materials with tailored morphologies.