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Related Concept Videos

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...
X-ray Crystallography02:18

X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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...
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...
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...
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...

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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Published on: May 20, 2014

Grain-boundary fluctuations in two-dimensional colloidal crystals.

Thomas O E Skinner1, Dirk G A L Aarts, Roel P A Dullens

  • 1Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom. thomas.skinner@chem.ox.ac.uk

Physical Review Letters
|January 15, 2011
PubMed
Summary

We investigated grain-boundary fluctuations in colloidal crystals using video microscopy. Capillary wave theory accurately predicted experimental results, yielding key parameters for grain-boundary migration.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Soft matter physics

Background:

  • Grain boundaries are crucial in materials properties.
  • Understanding grain boundary dynamics is essential for controlling material behavior.
  • Colloidal crystals offer a model system for studying fundamental physical phenomena.

Purpose of the Study:

  • To investigate grain-boundary fluctuations in two-dimensional colloidal crystals.
  • To determine interfacial stiffness and interface mobility.
  • To validate theoretical models for grain-boundary migration.

Main Methods:

  • Real-space and time observation using video microscopy.
  • Analysis of static and dynamic correlation functions.
  • Application of capillary wave theory.

Main Results:

  • Experimental data align well with capillary wave theory predictions.
  • Interfacial stiffness and interface mobility were directly determined.
  • Grain-boundary position confirmed to follow a one-dimensional random walk.

Conclusions:

  • Capillary wave theory effectively describes grain-boundary fluctuations in colloidal crystals.
  • The study provides direct measurements of key parameters for curvature-driven grain-boundary migration.
  • Experimental findings support theoretical predictions of random walk behavior for grain boundaries.