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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...
Coagulation01:06

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
Colloids03:22

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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Related Experiment Video

Updated: May 15, 2026

Fabrication of Spherical and Worm-shaped Micellar Nanocrystals by Combining Electrospray, Self-assembly, and Solvent-based Structure Control
06:16

Fabrication of Spherical and Worm-shaped Micellar Nanocrystals by Combining Electrospray, Self-assembly, and Solvent-based Structure Control

Published on: February 11, 2018

Colloidal crystals by electrospraying polystyrene nanofluids.

Arnau Coll1, Sandra Bermejo, David Hernández

  • 1MNT, Electronic Engineering Department, Universitat Politècnica de Catalunya, Jordi Girona 1-3, Barcelona, 08034, Spain. sandra.bermejo@upc.edu.

Nanoscale Research Letters
|January 15, 2013
PubMed
Summary
This summary is machine-generated.

Electrospray fabrication rapidly creates large-scale colloidal nanostructures and metamaterials. This technique simplifies setup and produces ordered nanolayers with high reflectivity.

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Last Updated: May 15, 2026

Fabrication of Spherical and Worm-shaped Micellar Nanocrystals by Combining Electrospray, Self-assembly, and Solvent-based Structure Control
06:16

Fabrication of Spherical and Worm-shaped Micellar Nanocrystals by Combining Electrospray, Self-assembly, and Solvent-based Structure Control

Published on: February 11, 2018

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Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles
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Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

Published on: March 13, 2016

Area of Science:

  • Materials Science
  • Nanotechnology
  • Physics

Background:

  • Fabricating large-scale colloidal nanostructures, such as colloidal crystals, presents significant challenges.
  • Existing top-down fabrication methods often involve complex experimental setups and limitations.

Purpose of the Study:

  • To introduce and validate the electrospray technique for efficient, large-scale fabrication of colloidal nanostructures.
  • To explore the influence of deposition parameters on the resulting metamaterial properties.

Main Methods:

  • Utilized electrospray of polystyrene nanospheres (360-nm diameter) from nanofluids.
  • Investigated parameters including electrode distance, nanofluid conductivity (3-4 mS), applied voltage (approx. 10 kV), and deposition rate.
  • Fabricated layers up to 20 μm thick and 1 cm² in area.

Main Results:

  • Successfully produced various metamaterials, from scattered monolayers to 3D ordered nanolayers with colloidal crystal properties.
  • Achieved large-area (1 cm²) and thick (20 μm) layers without cracks.
  • Optical reflectance measurements showed an 80% reflectivity peak near 950 nm.

Conclusions:

  • Electrospray is a viable and simplified method for fabricating large-scale colloidal nanostructures and metamaterials.
  • The technique offers control over nanostructure morphology and properties through adjustable deposition conditions.
  • The fabricated nanolayers exhibit promising optical characteristics suitable for photonic applications.