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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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Solvation-Layering-Assisted Formation of Highly Concentrated Colloidal Sub-10-nm-Diameter Layered Double Hydroxide

Yasuaki Tokudome1, Yosuke Ando1, Katsuki Yoneda1

  • 1Department of Materials Science, Graduate School of Engineering, Osaka Metropolitan University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 26, 2025
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We developed a novel method to disperse layered double hydroxide (LDH) nanoparticles at high concentrations (40 wt%) in polar solvents using acetylacetone as a surface modifier. This breakthrough enhances LDH applications in catalysis, sensing, optics, and drug delivery.

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Area of Science:

  • Materials Science
  • Colloid Chemistry
  • Nanotechnology

Background:

  • High-solid-concentration colloidal nanoparticles are crucial for advanced applications.
  • Layered double hydroxides (LDH) show promise but face dispersion challenges.

Purpose of the Study:

  • To develop a novel colloidal system for highly concentrated LDH nanoparticle dispersions.
  • To investigate the mechanism behind enhanced nanoparticle dispersibility.

Main Methods:

  • Utilized acetylacetone as a surface modifier for NiAl-LDH nanoparticles.
  • Employed nuclear magnetic resonance, small-angle X-ray scattering, and acoustic spectroscopy to study dispersion.
  • Achieved 40 wt% dispersion in polar solvents with optical transparency.

Main Results:

  • Acetylacetone effectively modified the LDH nanoparticle surface.
  • High-density solvent layering on the nanoparticle surface was identified as the key to dispersibility.
  • The system demonstrated optical transparency at high concentrations.

Conclusions:

  • The novel surface modification strategy enables highly concentrated LDH dispersions.
  • This advancement is expected to improve LDH performance in catalysis, sensing, optical materials, and drug delivery.