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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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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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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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While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.
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State-Controlled Exclusive Colloidal Assembly for Composition-Invariant Structural Color Mixing.

Yongseok Jung1, Young Geon Kim1, Gyuho Sim1

  • 1Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.

ACS Nano
|March 30, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method for creating structural color using colloidal self-assembly. This technique allows for a wider range of colors by controlling particle arrangements in mixtures, enabling advanced color mixing without changing composition.

Keywords:
colloidal crystalscrystallinitydepletion interactionmicropatternsstructural colors

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Colloidal self-assembly offers pigment-free structural coloration.
  • Conventional methods are limited to single photonic stopbands, restricting color gamut.

Purpose of the Study:

  • To expand the structural color gamut by controlling assembled grain states in colloidal mixtures.
  • To achieve precise color mixing without altering particle composition.

Main Methods:

  • Utilized depletion forces and modified electrostatic repulsion to tune interparticle potentials.
  • Investigated monodisperse, binary, and ternary colloidal mixtures.
  • Controlled particle states (fluid, crystal, glass) by adjusting depletant and salt concentrations.

Main Results:

  • Monodisperse particles showed tunable states from fluid to crystal to glass.
  • Binary mixtures exhibited distinct crystallization and glass formation regimes based on particle size and attraction strength.
  • Ternary mixtures achieved smooth, composition-invariant color transitions across the visible spectrum.

Conclusions:

  • Developed a versatile strategy for high-fidelity structural color mixing.
  • Demonstrated precise control over multiple stopbands and their contributions.
  • Presented a robust and reproducible platform for advanced structural coloration.