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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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Inkjet Printing of Structurally Colored Self-Assembled Colloidal Aggregates.

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This study introduces photonic balls (PB) as ready-to-use inks for inkjet printing, enabling the creation of vibrant, stable, structurally colored materials. These nanoparticle aggregates offer a novel approach to advanced colorant applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Structurally colored materials provide superior stability and biocompatibility compared to chemical pigments.
  • Current applications require compartmentalizing these materials into small building blocks (under 5 μm) for use in ready-to-use inks.
  • Photonic balls (PB), which are spherical nanoparticle aggregates, offer a potential solution for creating such inks.

Purpose of the Study:

  • To demonstrate the feasibility of using photonic ball dispersions as inkjet printing inks.
  • To develop a method for manufacturing structurally colored inks suitable for printing.
  • To enhance the color purity and printing quality of structurally colored materials.

Main Methods:

  • Manufacture of structurally colored photonic balls using solvent drying techniques.
  • Dispersion of photonic balls in pentanol to create printable ink.
  • Utilizing a custom inkjet printing platform with an industrial printhead and recirculation system.
  • Incorporation of carbon black to absorb light and suppress multiple scattering.

Main Results:

  • Successful fabrication of photonic ball dispersions suitable for inkjet printing.
  • Demonstration of printing complex, structurally colored patterns using photonic ball inks.
  • Improved color purity and reduced scattering achieved by adding carbon black.

Conclusions:

  • Photonic ball dispersions represent a viable and novel approach for creating ready-to-use inks for structurally colored materials.
  • Inkjet printing of photonic balls enables the fabrication of intricate, stable, and vibrant color patterns.
  • The addition of light absorbers like carbon black is effective in enhancing color quality in printed applications.