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Related Concept Videos

Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent – the...

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Origami Inspired Self-assembly of Patterned and Reconfigurable Particles
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Leveraging Hierarchical Self-Assembly Pathways for Realizing Colloidal Photonic Crystals.

Abhishek B Rao1, James Shaw1, Andreas Neophytou1

  • 1School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom.

ACS Nano
|May 7, 2020
PubMed
Summary
This summary is machine-generated.

Hierarchical self-assembly of designer patchy particles creates stable colloidal open crystals. This method overcomes mechanical instability and enables photonic applications by controlling polymorph selection.

Keywords:
colloidal self-assemblyhierarchical self-assemblypatchy particlesphotonic crystalstetrastack lattice

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Crystallography

Background:

  • Colloidal open crystals are promising for photonic applications.
  • Fabricating these structures via self-assembly is challenging due to mechanical instability and polymorph control.
  • Achieving thermodynamically favored and kinetically accessible structures is crucial.

Purpose of the Study:

  • To devise hierarchical self-assembly pathways for fabricating stable colloidal open crystals.
  • To control the formation of specific crystal polymorphs (cubic and hexagonal).
  • To investigate the photonic properties of the resulting crystals.

Main Methods:

  • Utilizing designer triblock patchy particles for hierarchical self-assembly.
  • Employing a two-stage self-assembly process via tetrahedral clusters.
  • Analyzing crystallization pathways by suppressing ring formations.
  • Implementing slow annealing to influence polymorph selection.
  • Calculating photonic band structures for different polymorphs.

Main Results:

  • Successful hierarchical self-assembly yielding tetrahedral clusters and tetrastack crystals.
  • Suppression of unfavorable ring structures, promoting ordered crystallization.
  • Slow annealing biases self-assembly towards the cubic polymorph.
  • The cubic polymorph exhibits a complete photonic band gap at a realizable filling fraction.
  • The hexagonal polymorph also shows a complete photonic band gap with post-assembly processing.

Conclusions:

  • Hierarchical self-assembly offers a viable route to mechanically stable colloidal open crystals.
  • The devised pathways effectively control polymorph selection and crystallization.
  • Both cubic and hexagonal polymorphs demonstrate potential for photonic applications, with different fabrication requirements.