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Updated: Dec 3, 2025

Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

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Quantification of ordering in active light driven colloids.

Mark Frenkel1, Pooja Arya2, Edward Bormashenko1

  • 1Chemical Engineering Department, Faculty of Engineering, Ariel University, P.O.B. 3, Ariel 40700, Israel.

Journal of Colloid and Interface Science
|October 31, 2020
PubMed
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Extreme Values and Convergence of the Voronoi Entropy for 2D Random Point Processes and for Long-Range Order.

Entropy (Basel, Switzerland)·2026

Light-induced diffusioosmosis enables controlled self-assembly of colloidal particles into ordered 2D patterns. Voronoi entropy quantifies this ordering, revealing hierarchical structures and oscillations under blue light irradiation.

Area of Science:

  • Colloid and Surface Science
  • Soft Matter Physics
  • Nanotechnology

Background:

  • Colloidal self-assembly is crucial for advanced materials.
  • Light-responsive surfactants offer tunable control over particle interactions.
  • Understanding ordering in colloidal systems is key to designing functional materials.

Purpose of the Study:

  • To investigate light-driven diffusioosmosis for controlled colloidal self-assembly.
  • To quantify the ordering of 2D colloidal patterns using Voronoi entropy.
  • To analyze the hierarchical nature of ordering in illuminated colloidal suspensions.

Main Methods:

  • Utilizing nanoporous silica microspheres and photosensitive azobenzene cationic surfactant.
  • Employing light irradiation (wavelength and intensity) to control diffusioosmotic flow.
Keywords:
2D colloid orderingAzobenzene containing cationic surfactantsLight induced diffusioosmotic flowVoronoi entropy

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  • Measuring and analyzing Voronoi entropy changes over time and across different scales.

    • Main Results:

    • Demonstrated light-driven diffusioosmosis for self-assembly of well-ordered 2D colloidal patterns.
    • Quantified ordering evolution using Voronoi entropy under various irradiation conditions.
    • Identified hierarchical ordering (individual particles, clusters, within clusters) and particle oscillations (1.125 Hz).

    Conclusions:

    • Voronoi entropy effectively quantifies colloidal ordering in light-induced self-assembly.
    • Hierarchical ordering emerges at different lateral scales.
    • Minimal Voronoi entropy correlates with close-packed 2D colloidal clusters.