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  3. Fabrication And Modeling Of A Thermoreversible Modular Core-shell Colloidal System.
  1. Home
  3. Fabrication And Modeling Of A Thermoreversible Modular Core-shell Colloidal System.

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Florence J Müller1,2, Alec J Pellicciotti3, Shivaprakash Ramakrishna1

  • 1Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland.

Langmuir : the ACS Journal of Surfaces and Colloids
|September 24, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

Researchers developed a new method for creating silica particles for studying colloidal gels. This approach offers precise control over particle properties, improving reproducibility in rheological studies.

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Area of Science:

  • Materials Science
  • Colloid Science
  • Physical Chemistry

Background:

  • Octadecyl-coated silica particles are used in rheological studies of colloidal gels.
  • Existing synthesis methods lack reproducibility due to variable grafting densities and transition temperatures.

Purpose of the Study:

  • To develop a more reproducible method for synthesizing octadecyl-coated silica particles.
  • To achieve precise control over grafting density and interparticle interactions for model colloidal gel systems.

Main Methods:

  • Utilized an amine-yne click-like reaction for grafting octadecyl chains onto silica particles.
  • Suspended particles in tetradecane, exhibiting a reversible liquid-solid transition below 20 °C.
  • Controlled grafting density by fine-tuning reaction conditions.

Main Results:

  • Achieved high-fidelity grafting of octadecyl chains with precise control over density.
  • Demonstrated a reversible liquid-solid transition below 20 °C, ideal for rheological studies.
  • Interparticle interactions modeled as a superposition of temperature-dependent forces, validated by AFM.

Conclusions:

  • The novel synthesis method provides a highly reproducible model system for colloidal gel studies.
  • Precise tuning of interparticle potentials enables quantitative comparisons between experiments and simulations.
  • This system minimizes rheological characterization complications like loading history and thixotropy.