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Dodecagonal tiling in mesoporous silica.

Changhong Xiao1, Nobuhisa Fujita, Keiichi Miyasaka

  • 1Department of Materials and Environmental Chemistry, Bezelii Center EXSELENT on Porous Materials, Stockholm University, S-10691 Stockholm, Sweden.

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|July 20, 2012
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Summary
This summary is machine-generated.

Researchers created mesoporous silica with quasicrystal structures using self-assembling micelles. This breakthrough offers potential for optical applications by enabling precise control over mesoscale quasicrystal formation.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Soft Matter Physics

Background:

  • Quasicrystals are typically found at atomic scales (intermetallic quasicrystals).
  • Recent work has extended quasicrystals to mesoscale (20-500 Å) using soft matter systems like polymers and colloids.
  • Achieving ideal structures and precise control in mesoscale quasicrystals remains a challenge.

Purpose of the Study:

  • To develop a new class of mesoporous silicas exhibiting quasicrystalline properties at the mesoscale.
  • To investigate the self-assembly process for creating ordered quasicrystalline structures in soft matter.
  • To explore potential optical applications enabled by mesoscale quasicrystals.

Main Methods:

  • Utilized the self-assembly of surfactant micelles to synthesize mesoporous silica.
  • Employed electron diffraction and transmission electron microscopy for structural analysis.
  • Performed quantitative phason strain analysis to verify quasicrystallinity.

Main Results:

  • Successfully produced mesoporous silica particles with 12-fold (dodecagonal) symmetry.
  • Observed quasicrystal-like structures in the center surrounded by crystalline domains.
  • Verified quasicrystallinity through electron diffraction and phason strain analysis.
  • Identified a non-equilibrium growth process involving micellar configuration competition.

Conclusions:

  • Surfactant micelle self-assembly can yield mesoporous silicas with dodecagonal quasicrystal structures.
  • The formation process is linked to non-equilibrium growth and micellar interactions.
  • This method offers a pathway toward controlled fabrication of mesoscale quasicrystals for potential applications.