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Confinement Assembly of Terpolymer-Based Janus Nanoparticles.

Suna Azhdari1, Fabian Herrmann2, Deniz Coban1

  • 1Physical Chemistry, University of Münster, Corrensstraße 28-30, Münster, 48149, Germany.

Macromolecular Rapid Communications
|April 4, 2022
PubMed
Summary

Janus nanoparticles (JNPs) self-assembly in drying emulsion droplets was studied. Order in JNPs diminishes with deviations from Janus balance, unlike terpolymers.

Keywords:
Janus nanoparticlesSPG membranesblock copolymersemulsionsmicrophase separationmonodisperse microparticles

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Confinement self-assembly of block copolymers into microparticles is well-researched.
  • The behavior of Janus nanoparticles (JNPs) within spherical confinement remains largely unexplored.

Purpose of the Study:

  • Investigate the confinement self-assembly of JNPs in drying emulsion droplets.
  • Compare JNP behavior to their ABC triblock terpolymer precursors.

Main Methods:

  • Emulsion preparation using Shirasu Porous Glass membranes for controlled microparticle size.
  • Transmission electron microscopy (TEM) on ultrathin cross sections to analyze internal microparticle structure.

Main Results:

  • Microparticles with narrow size distributions (Rh = 250-500 nm) were produced.
  • Terpolymer confinement assembly yielded ordered microstructures.
  • JNP order decreased as the Janus balance deviated from parity.

Conclusions:

  • Spherical confinement affects JNP self-assembly differently than terpolymers.
  • Janus balance is a critical factor influencing JNP order in confined systems.