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Updated: Jun 4, 2025

Assembly and Characterization of Polyelectrolyte Complex Micelles
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Self-assembly of defined core-shell ellipsoidal particles at liquid interfaces.

Jack Eatson1, Susann Bauernfeind2, Benjamin Midtvedt3

  • 1Department of Physics and Astrophysics, G. W. Gray Centre for Advanced Materials, University of Hull, Hull HU6 7RX, United Kingdom.

Journal of Colloid and Interface Science
|December 31, 2024
PubMed
Summary

Adding polymer shells to ellipsoidal particles allows control over their self-assembly at liquid interfaces. This engineering approach enables deterministic formation of desired tip-to-tip or side-to-side structures by tuning particle geometry and shell properties.

Keywords:
Anisotropic particleCapillary interactionsCore-shell polymeric ellipsoidal particlesLiquid interfacesPhase behaviourSelf-assembly

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Area of Science:

  • Colloid and surface science
  • Materials science
  • Soft matter physics

Background:

  • Anisotropic particles at liquid interfaces self-assemble via capillary interactions.
  • Quadrupolar interactions favor either tip-to-tip or side-to-side configurations.
  • Predicting and controlling self-assembly structures remains a challenge.

Purpose of the Study:

  • To investigate the effect of polymer shells on the interfacial self-assembly of ellipsoidal particles.
  • To determine how particle geometry and shell properties influence self-assembly configurations.
  • To develop a method for controlling the self-assembly of anisotropic particles.

Main Methods:

  • Fabrication of core-shell ellipsoidal particles with controlled aspect ratios and shell thicknesses using thermo-mechanical stretching.
  • Interfacial self-assembly experiments to observe structural formation.
  • Monte Carlo simulations and theoretical calculations to map the phase diagram of preferred structures.

Main Results:

  • Unshelled ellipsoidal particles consistently form side-to-side chain-like assemblies.
  • Core-shell ellipsoidal particles transition from tip-to-tip flower-like to side-to-side structures with increasing aspect ratio.
  • The critical aspect ratio for this transition is modulated by shell thickness.

Conclusions:

  • Polymer shells can effectively tune the capillary interactions of ellipsoidal particles at liquid interfaces.
  • Engineering particle aspect ratio and shell thickness allows for deterministic control over self-assembly configurations.
  • This work provides a pathway for designing and realizing specific structures from anisotropic particles.