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Nanosheet Particles with Defect-Free Block Copolymer Structures Driven by Emulsions Containing Crystallizable

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Small (Weinheim an Der Bergstrasse, Germany)
|September 19, 2023
PubMed
Summary

Researchers created highly elongated nanosheet particles using collapsed emulsions and crystallizable surfactants. These particles exhibit large surface areas and ordered block copolymer structures, showing promise for advanced coating applications.

Keywords:
block copolymer particlesemulsioninterfacial instabilitynanosheetsself-assembly

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Science

Background:

  • Anisotropic nanoparticles with ordered nanostructures are crucial for tunable photonic, rheological, and electronic properties.
  • Developing scalable methods for creating high-aspect-ratio nanostructures remains a challenge.

Purpose of the Study:

  • To synthesize highly anisotropic nanosheet particles with well-ordered internal block copolymer (BCP) arrays.
  • To investigate the mechanism of particle formation and their potential in coating applications.

Main Methods:

  • Utilizing collapsed emulsions as scaffolds for BCP self-assembly.
  • Employing crystallizable surfactants (fatty alcohols like 1-octadecanol) to reduce interfacial tension and stabilize emulsion deformation.
  • Investigating the influence of surfactant alkyl chain length on particle formation.

Main Results:

  • Achieved defect-free BCP nanosheet particles with aspect ratios exceeding 50.
  • Demonstrated that 1-octadecanol lowers interfacial tension below 1 mN m-1 and its crystallization arrests emulsion shape.
  • Observed that particle shape anisotropy significantly influences deposition patterns in coating applications.

Conclusions:

  • Collapsed emulsions provide an effective route to high-aspect-ratio BCP nanosheet particles.
  • The developed method offers precise control over particle morphology and internal nanostructure.
  • These anisotropic nanosheet particles hold significant potential for advanced material coatings.