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Synthesis and Characterization of Supramolecular Colloids
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Colloidal Particles with Triangular Patches.

Mingxin He1,2, Johnathon P Gales2, Xinhang Shen1

  • 1Department of Chemical and Biomolecular Engineering, New York University, Brooklyn, New York 11201, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 3, 2021
PubMed
Summary
This summary is machine-generated.

Colloidal particles with triangular patches were synthesized for clathrate hydrate formation. Particle size and patch geometry are critical for self-assembly into desired crystalline structures.

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Area of Science:

  • Colloidal science
  • Materials science
  • Crystallography

Background:

  • Self-assembly of colloidal particles into clathrate hydrates requires specific particle geometries.
  • Previous attempts were limited by circular patches due to surface energy minimization.
  • Triangular patches are hypothesized to facilitate the necessary eclipsed conformation for clathrate hydrate formation.

Purpose of the Study:

  • To develop a method for fabricating colloidal particles with triangular patches.
  • To investigate the self-assembly behavior of these triangular patchy particles.
  • To determine the optimal conditions for forming colloidal clathrate hydrates.

Main Methods:

  • Colloidal fusion process with controlled oil droplet viscosity to create triangular patches.
  • Tuning patch curvature using oil droplet viscosity and surfactants.
  • Functionalization of patches with single-stranded DNA via strain-promoted azide-alkyne cycloaddition.
  • Annealing experiments to observe self-assembly behavior.

Main Results:

  • Successfully fabricated colloidal particles with triangular patches.
  • Synthesized dipatch particles with eclipsed patches and tetrahedral patchy particles.
  • Dipatch particles formed chains due to small patches, hindering clathrate hydrate formation.
  • Tetrahedral particles formed random aggregates due to excessively large triangular patches.

Conclusions:

  • Colloidal particle synthesis with triangular patches is achievable.
  • Particle size and patch geometry significantly influence self-assembly into clathrate hydrates.
  • Tetrahedral patchy particles require a diameter less than 1 μm for successful crystallization.