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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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Synthesis and Characterization of Supramolecular Colloids
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Nanocomposite colloids prepared by the Ouzo effect.

Joseph Rosenfeld1, Francois Ganachaud2, Daeyeon Lee1

  • 1Department of Chemical and Biomolecular Engineering, University of Pennsylvania, 311A Towne Building, 220 South 33rd Street, Philadelphia, PA 19104, United States.

Journal of Colloid and Interface Science
|October 12, 2023
PubMed
Summary

Controlling nanoparticle arrangement in nanocomposite colloids is achieved by co-precipitating oil and polymer. Nanoparticle wetting properties dictate their strategic positioning within oil core/polymer shell nanocapsules.

Keywords:
CompositesMicrofluidicsNanocapsulesNanocolloidsNanoparticlesNanoprecipitationWetting

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Area of Science:

  • Materials Science
  • Colloid Chemistry
  • Nanotechnology

Background:

  • Nanocomposite colloids offer enhanced functionality through organized nanoparticle structures.
  • Controlling nanoparticle arrangement is key to tailoring suprastructure properties.

Purpose of the Study:

  • To systematically control nanoparticle organization within nanocomposite colloids.
  • To investigate the influence of nanoparticle wetting properties on their arrangement.
  • To produce oil core/polymer shell nanocapsules with precisely positioned nanoparticles.

Main Methods:

  • Utilized glass capillary microfluidics for oil and polymer co-precipitation with nanoparticles.
  • Employed silica nanoparticles with varied surface properties and morphologies.
  • Characterized nanocomposite structures using electron microscopy, sessile drop, and zeta potential measurements.

Main Results:

  • Nanocomposite morphology varied based on nanoparticle wetting properties, from partial shell engulfment to oil core embedding.
  • Nanoparticle concentration in the precursor solution controlled the number of nanoparticles within the nanocomposite.
  • The wetting properties of non-spherical and hollow silica nanoparticles influenced the resulting nanocolloid structures.

Conclusions:

  • Nanoparticle wetting properties are a critical factor in directing their organization within co-precipitated nanocomposite colloids.
  • The co-precipitation method allows for controlled fabrication of nanocapsules with tailored nanoparticle placement.
  • This approach enables the design of functional nanocomposite materials with predictable nanostructure.