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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 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 crystallites under external oscillation.

Hreedish Kakoty1, Yunhu Huang2, Rajarshi Banerjee1

  • 1Department of Physics, Indian Institute of Science, Bangalore 560012, India.

Soft Matter
|June 13, 2020
PubMed
Summary
This summary is machine-generated.

Colloidal crystals in optical traps maintain order under small oscillations but break down at large amplitudes due to potential anharmonicity. This reveals insights into the dynamic behavior of ordered particle systems.

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Area of Science:

  • Soft matter physics
  • Condensed matter physics
  • Optical physics

Background:

  • Two-dimensional colloidal systems offer a model for studying phase transitions and ordering phenomena.
  • Optical traps provide precise control over particle interactions and confinement.
  • Understanding the response of ordered structures to external perturbations is crucial for materials science.

Purpose of the Study:

  • To investigate the structural stability of two-dimensional colloidal crystals under external oscillations.
  • To determine the critical amplitude at which crystalline order breaks down.
  • To explore the role of the confinement potential's anharmonicity in system dynamics.

Main Methods:

  • Utilizing a loosely focused optical trap to create two-dimensional colloidal assemblies.
  • Applying controlled external oscillations to the optical trap.
  • Analyzing the crystalline order and system response at varying oscillation amplitudes.
  • Comparing experimental observations with numerical simulations.

Main Results:

  • Colloidal crystallites maintained structural integrity under small-amplitude oscillations, behaving as predicted by simulations.
  • Crystalline order was lost at large oscillation amplitudes, indicating a breakdown of rigidity.
  • The observed rigidity breakdown is attributed to the anharmonic component of the optical confinement potential.

Conclusions:

  • The study demonstrates a transition from rigid-body-like behavior to instability in confined colloidal crystals under dynamic perturbation.
  • Anharmonic potentials play a significant role in limiting the stability of ordered structures under stress.
  • The findings have implications for designing and controlling ordered finite-sized systems in various physical applications.