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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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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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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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Liquid–Solid Solutions01:29

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The process of a solid dissolving in a liquid to form a solution is governed by the solubility limit, which is the maximum amount of the solid substance, or solute, that can be dissolved in a specific volume of the liquid or solvent. As the solute dissolves, it reaches a point where no more solute can be dissolved at a given temperature - this is known as the saturation point. However, if further solute is added and it manages to dissolve, the solution becomes supersaturated. Supersaturated...
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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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Molecular Comparison of Gases, Liquids, and Solids02:26

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Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
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Updated: Apr 5, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Chromatic patchy particles: Effects of specific interactions on liquid structure.

Oleg A Vasilyev1, Boris A Klumov2, Alexei V Tkachenko3

  • 1Max-Planck-Institut für Intelligente Systeme, Heisenbergstraße 3, Stuttgart, Germany and IV. Institut für Theoretische Physik, Universität Stuttgart, Pfaffenwaldring 57, Stuttgart, Germany.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
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Summary

Adding "color" to patchy particles, like DNA linkers, makes liquids less connected and stable. This "chromatic" interaction favors crystal formation over liquid phases in phase diagrams.

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Area of Science:

  • Soft Matter Physics
  • Computational Chemistry
  • Materials Science

Background:

  • Patchy particles are model systems for studying self-assembly and phase behavior.
  • Specific interactions between patches, termed "color," can direct self-assembly.
  • DNA-mediated interactions offer a route to realizing programmable "chromatic" interactions.

Purpose of the Study:

  • To investigate the impact of "color" (specific patch interactions) on the structural and thermodynamic properties of patchy particle liquids.
  • To compare the behavior of "colored" (DNA-linked) and "colorless" patchy particle systems.
  • To analyze the influence of patch arrangement (tetrahedral, cubic) on liquid properties.

Main Methods:

  • Molecular Dynamics (MD) simulations were employed to model patchy particle systems.
  • Structural properties, including local connectivity and bond orientation order, were analyzed.
  • Thermodynamic stability was assessed by comparing liquid and crystalline phases.

Main Results:

  • "Colorless" patchy particle liquids exhibit higher connectivity, density, and local order compared to "colored" liquids.
  • The presence of "chromatic" interactions (color) leads to a less stable liquid phase.
  • Aggregates formed by "colored" particles show distinct structural differences from "colorless" ones.

Conclusions:

  • Specific "chromatic" interactions destabilize the liquid phase of patchy particles.
  • These interactions promote the relative stability of the crystalline phase, expanding its region in the phase diagram.
  • The findings provide insights into designing self-assembling materials with tunable phase behavior.