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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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Assembly of Complex Microtubule Structures01:32

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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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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

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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

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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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Related Experiment Video

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Interactive Molecular Model Assembly with 3D Printing
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Large-Scale Noniridescent Structural Color Printing Enabled by Infiltration-Driven Nonequilibrium Colloidal Assembly.

Ling Bai1, Van Cuong Mai1,2, Yun Lim1

  • 1School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, Singapore, 637457, Singapore.

Advanced Materials (Deerfield Beach, Fla.)
|January 13, 2018
PubMed
Summary

A new infiltration-assisted colloidal assembly method enables rapid, large-scale fabrication of full-spectrum, noniridescent structural color patterns. This technology offers wide viewing angles and versatile applications for advanced color displays.

Keywords:
amorphous colloidal arrayinfiltrationinkjet printingnonequilibrium assemblystructural color printing

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Structural colors, derived from micro-/nanostructures, offer photostability and energy efficiency.
  • Noniridescent structural color with wide viewing angles is highly sought after but lacks rapid fabrication methods.

Purpose of the Study:

  • To develop a rapid and large-scale fabrication method for full-spectrum structural color patterns with wide viewing angles.
  • To demonstrate the versatility of the new method for diverse applications.

Main Methods:

  • Infiltration-driven nonequilibrium assembly of colloidal particles on specialized substrates to form amorphous colloidal arrays (ACAs) within milliseconds.
  • Infiltration-Assisted (IFAST) colloidal assembly for rapid manufacturing and color mixing.
  • Utilizing a commercial office inkjet printer to mix primary structural colors (red, blue, yellow) for full-spectrum output.

Main Results:

  • Successfully produced full-spectrum noniridescent structural colors with wide viewing angles.
  • Demonstrated rapid, large-scale fabrication of structural color patterns with complex designs using IFAST printing.
  • Achieved straightforward structural color mixing by combining primary colors.

Conclusions:

  • The IFAST colloidal assembly is a versatile technology for fabricating wide-viewing-angle structural color patterns.
  • This method enables rapid, large-scale production of sophisticated structural color designs.
  • The technology holds promise for diverse applications due to flexible material and substrate design.