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Related Concept Videos

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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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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Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so...
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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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In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
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Related Experiment Video

Updated: Mar 2, 2026

Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly
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Chemically Controlled Spatiotemporal Oscillations of Colloidal Assemblies.

Alicia Altemose1, María Antonieta Sánchez-Farrán2, Wentao Duan1

  • 1Department of Chemistry, The Pennsylvania State University, University Park, PA, 16802, USA.

Angewandte Chemie (International Ed. in English)
|May 12, 2017
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Summary

Active colloidal particles autonomously oscillate between clustering and dispersing. This self-diffusiophoretic micromotor system

Keywords:
colloidsdiffusiophoresisnanoparticlesoscillationsphotocatalysis

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Area of Science:

  • Colloid science
  • Active matter physics
  • Nanotechnology

Background:

  • Active colloidal particles exhibit complex behaviors.
  • Self-propulsion and self-assembly are key phenomena in micro- and nanomotor systems.

Purpose of the Study:

  • To report a novel autonomous oscillatory micromotor system.
  • To investigate the mechanisms driving particle clustering and dispersion dynamics.

Main Methods:

  • Utilized aqueous suspensions of silver orthophosphate microparticles under UV illumination.
  • Varied hydrogen peroxide concentrations to study oscillatory behavior.
  • Introduced inert silica particles to observe hierarchical sorting.

Main Results:

  • Observed autonomous oscillation of particle clusters, characterized by periodic size changes.
  • Identified an electrolytic self-diffusiophoretic mechanism involving alternating electric fields.
  • Demonstrated that oscillation frequency is tunable via hydrogen peroxide concentration.
  • Showcased hierarchical sorting and packing of clusters with added silica particles.

Conclusions:

  • The system exhibits autonomous, synchronized oscillations driven by chemical and electrical gradients.
  • Hydrogen peroxide concentration is a critical parameter for controlling oscillation frequency.
  • Hierarchical self-organization occurs, leading to core-shell structures with distinct oscillatory properties.