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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...
Spherical and Cylindrical Capacitor01:26

Spherical and Cylindrical Capacitor

A spherical capacitor consists of two concentric conducting spherical shells of radii R1 (inner shell) and R2 (outer shell). The shells have equal and opposite charges of +Q and −Q, respectively. For an isolated conducting spherical capacitor, the radius of the outer shell can be considered to be infinite.
Conventionally, considering the symmetry, the electric field between the concentric shells of a spherical capacitor is directed radially outward. The magnitude of the field, calculated by...

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Related Experiment Video

Updated: Jul 13, 2026

Fabrication of Spherical and Worm-shaped Micellar Nanocrystals by Combining Electrospray, Self-assembly, and Solvent-based Structure Control
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Convectively assembled nonspherical mushroom cap-based colloidal crystals.

Ian D Hosein1, Chekesha M Liddell

  • 1Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 17, 2007
PubMed
Summary

Researchers created ordered monolayers of mushroom-shaped polymer colloids using vertical deposition. These colloidal crystals exhibit hexagonal packing and can be stacked for 3D structures, offering a method for large-scale crystallization.

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Area of Science:

  • Materials Science
  • Colloid Science
  • Polymer Science

Background:

  • Fabrication of ordered colloidal structures is crucial for advanced materials.
  • Controlling particle shape and assembly is key to achieving desired material properties.

Purpose of the Study:

  • To develop a method for creating ordered monolayers of mushroom-shaped polymer colloids.
  • To investigate the self-assembly and structural properties of these colloidal monolayers.
  • To explore the potential for stacking these monolayers into three-dimensional structures.

Main Methods:

  • Vertical substrate deposition technique for monolayer fabrication.
  • Scanning Electron Microscopy (SEM) and autocorrelation analysis for structural characterization.
  • Selected area laser diffraction for analyzing the 2D diffraction grating properties.
  • Layer-by-layer deposition for 3D stacking.

Main Results:

  • Achieved long-range hexagonal packing in colloidal monolayers.
  • Demonstrated restricted orientational freedom ('heads up'/'heads down') of particles.
  • Successfully stacked ordered monolayers into the third dimension.
  • Validated convective assembly as a method for large-scale crystallization.

Conclusions:

  • Mushroom-shaped polymer colloid monolayers exhibit unique ordered structures.
  • Vertical deposition and layer-by-layer stacking are effective for creating 3D colloidal crystals.
  • Convective assembly is a promising technique for scalable production of nonspherical colloidal crystals.