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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

538
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...
538
Coagulation01:06

Coagulation

278
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...
278

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Engineering the Electrostatic Interactions between Oppositely Charged Polymer-Grafted Nanoparticles for Constructing

Xiaoxue Shen1, Huibin He1, Di Zheng1

  • 1State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, People's Republic of China.

ACS Nano
|July 31, 2024
PubMed
Summary

Fabricating nanoparticle arrays is challenging. This polymer-based strategy enables controlled self-assembly of charged nanoparticle clusters into diverse structures on substrates for advanced applications.

Keywords:
electrostatic interactionnanoparticlespolyelectrolyteself-assemblysubstrate-supported colloidal molecules

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Colloid Science

Background:

  • Arrays of nanoparticle (NP) clusters are crucial for nanolasers, sensors, and photocatalysis.
  • Fabricating ordered NP arrays on substrates presents significant challenges.
  • Existing methods lack control over NP cluster architecture and large-area production.

Purpose of the Study:

  • To present a polymer-based strategy for directed self-assembly of nanoparticle clusters on substrates.
  • To demonstrate control over the architecture and coordination number of nanoparticle assemblies.
  • To enable large-area fabrication of structurally precise nanoparticle arrays.

Main Methods:

  • Utilized polymer-grafted nanoparticles (PGNPs) with opposite charges for self-assembly via electrostatic interactions.
  • Employed process-directed self-assembly on substrates to form stable colloidal molecules (CMs).
  • Tuned coordination numbers (x) of ABx CMs by adjusting solution pH, ionic strength, or PGNPs' charge densities.

Main Results:

  • Achieved directed self-assembly of binary PGNPs into stable CMs on substrates.
  • Demonstrated tunable coordination numbers (x) from AB to AB7 in the CMs.
  • Successfully constructed large-area CMs with diverse structures in high yields.
  • Validated the approach for PGNPs with various core materials.

Conclusions:

  • The polymer-based strategy offers a robust method for fabricating structurally precise nanoparticle assemblies on substrates.
  • This approach facilitates the creation of ordered NP arrays with controlled architectures.
  • The developed technique provides a valuable tool for advancing applications in nanolasers, sensors, and photocatalysis.