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Directed Assembly of Elastin-like Proteins into defined Supramolecular Structures and Cargo Encapsulation In Vitro
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Opal shell structures: direct assembly versus inversion approach.

Tian-Song Deng1, Parvin Sharifi, Frank Marlow

  • 1Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr (Germany). dengts@pku.edu.cn.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|July 12, 2013
PubMed
Summary
This summary is machine-generated.

Direct assembly of hollow spheres (hs-opal) creates fewer defects than inverse opal fabrication. This method shows promise for creating highly ordered photonic crystals with suppressed crack formation.

Keywords:
direct assemblyhollow silica shellsinverse opalopaline systemsshell structures

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Opal shell structures are crucial for photonic crystal applications.
  • Two primary fabrication methods exist: direct assembly and inverse opal templating.
  • Understanding lattice disturbances is key to improving crystal quality.

Purpose of the Study:

  • To compare the defect levels in opal shell structures fabricated by direct assembly versus inverse opal methods.
  • To identify fabrication routes that minimize structural imperfections for enhanced photonic properties.

Main Methods:

  • Fabrication of opal shell structures using direct assembly of hollow spheres (hs-opal).
  • Fabrication of inverse opal structures via precursor infiltration and template inversion.
  • Characterization of lattice disturbances using scanning electron microscopy (SEM), optical microscopy, and transmission spectra.

Main Results:

  • The hs-opal system exhibited significantly lower lattice disturbances, including fewer cracks and deformations.
  • Inverse opal structures showed a higher degree of structural imperfections.
  • Suppression of crack formation was notably observed in one inverse opal variant.

Conclusions:

  • Direct assembly of hollow spheres offers a superior method for fabricating highly ordered opal shell structures.
  • The reduced defect density in hs-opal structures makes them promising for advanced photonic crystal applications.
  • Further research into inverse opal methods could lead to improved defect suppression and perfect photonic crystal fabrication.