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Related Concept Videos

Colloids03:22

Colloids

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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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Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Colloids and Suspensions01:17

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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 precipitates01:09

Colloidal precipitates

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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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Colors and Magnetism03:02

Colors and Magnetism

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Color Vision01:24

Color Vision

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Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
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Structural Coloration with Nonclose-Packed Array of Bidisperse Colloidal Particles.

Gun Ho Lee1, Jong Bin Kim1, Tae Min Choi1

  • 1Department of Chemical and Biomolecular Engineering (BK21+ Program), Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|January 15, 2019
PubMed
Summary

Researchers controlled colloidal crystal and glass arrangements using two silica particle sizes. This method tunes optical properties, enabling tunable structural coloration with varying size contrasts and mixing ratios.

Keywords:
colloidal arrayscolloidsmechanochromismrepulsive potentialstructural colors

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Area of Science:

  • Materials Science
  • Optics
  • Colloid Science

Background:

  • Colloidal crystals and glasses exhibit distinct photonic effects: narrowband high reflectivity (crystals) and broadband low reflectivity (glasses).
  • Achieving tunable optical properties requires controlling the arrangement of colloidal particles between crystalline and glassy states.

Purpose of the Study:

  • To develop a simple method for controlling colloidal arrangements between crystalline and glassy states.
  • To investigate the influence of particle size contrast and mixing ratio on colloidal structure and optical properties.

Main Methods:

  • Employing two different sizes of silica particles with repulsive interparticle potential.
  • Analyzing the effect of size contrast and mixing ratio on particle arrangement and resulting optical properties.

Main Results:

  • Small size contrast maintained long-range order, yielding pronounced reflectance peaks and brilliant structural colors.
  • Large size contrast reduced long-range order but preserved short-range order, resulting in low broadband reflectivity and faint structural colors.
  • Tunable optical properties were achieved by adjusting particle size contrast and mixing ratio.

Conclusions:

  • A simple method using binary silica particle mixtures effectively controls colloidal arrangement.
  • This approach offers a pathway to tune optical properties for applications in structural coloration.