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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

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...
The Colloidal State01:29

The Colloidal State

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 the...
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Colloids

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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Updated: Jun 23, 2026

Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics
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Published on: May 28, 2016

Polymerized crystalline colloidal array incorporated with silver nanoparticles.

Ye Dai1, Hua Bao, Jiaping Lin

  • 1School of Materials Science and Technology, Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology, Shanghai, 200237, P. R. China.

Journal of Nanoscience and Nanotechnology
|May 16, 2009
PubMed
Summary
This summary is machine-generated.

Researchers developed an intelligent polymerized crystalline colloidal array (PCCA) by incorporating silver nanoparticles. This modification resulted in a blue shift of the photonic band gap, leading to a broader band gap for enhanced optical properties.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photonics

Background:

  • Crystalline colloidal arrays (CCAs) self-assemble and diffract light in the UV-Vis spectrum.
  • Polymerized crystalline colloidal arrays (PCCA) offer tunable optical properties.
  • Modifying the refractive index contrast is key to tuning photonic band gaps.

Purpose of the Study:

  • To prepare an intelligent PCCA with a broader band gap.
  • To incorporate silver nanoparticles into a PCCA structure.
  • To investigate the effect of silver nanoparticles on the photonic band gap.

Main Methods:

  • Embedding monodisperse polystyrene colloids into a polyacrylamide hydrogel film.
  • Attaching thiol groups to the PCCA matrix via disulfide bond cleavage.
  • In-situ reduction of Ag+ to form silver nanoparticles within the PCCA.

Main Results:

  • Successfully prepared PCCA embedded with ~10 nm silver nanoparticles.
  • Reduced average refractive index of the PCCA due to silver nanoparticles.
  • Increased refractive index contrast between polystyrene particles and the matrix.

Conclusions:

  • The incorporation of silver nanoparticles led to a blue shift of the photonic band gap.
  • The modified PCCA exhibited a relatively broader band gap.
  • This approach offers a method for tuning the optical properties of CCAs.