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Korean Journal of Chemical Engineering

, Volume 35, Issue 10, pp 2138–2144 | Cite as

Scalable synthesis of carbon-embedded ordered macroporous titania spheres with structural colors

  • Dae-Woong Jung
  • Kyung Jin Park
  • Seungwoo Lee
  • Jaeyun Kim
  • Gaehang Lee
  • Gi-Ra Yi
Materials (Organic, Inorganic, Electronic, Thin Films)
  • 54 Downloads

Abstract

Carbon-embedded ordered macroporous titania (C-MAC TiO2) spheres are prepared in solution by the cooperative self-assembly of polymer beads and a titania precursor within evaporative emulsions and subsequent direct carbonization. Because the highly reactive titania precursors are easily crosslinked to form gels early in evaporation before the polymer beads are self-organized, non-reactive toluene-in-formamide emulsions are used. These non-aqueous emulsions should be stable at relatively high temperatures (~80 °C) for the evaporation process. We found that amphiphilic triblock copolymers of poly(ethylene oxide) (PEO) and poly(phenylene oxide) (PPO) with longer PEO chains (Pluronic® F108 (EO125-b-PO64-b-EO125) are required to stabilize those non-aqueous emulsions, and become more important at higher concentrations used for bulk fabrication. The carbon inside our C-MAC TiO2 significantly suppresses strong multiple scattering from structural defects or imperfections, thus emphasizing their Bragg reflection colors.

Keywords

Inverse Opal Titania Macropore Structural Color Sphere 

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Scalable synthesis of carbon-embedded ordered macroporous titania spheres with structural colors

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Copyright information

© Korean Institute of Chemical Engineers, Seoul, Korea 2018

Authors and Affiliations

  • Dae-Woong Jung
    • 1
  • Kyung Jin Park
    • 2
  • Seungwoo Lee
    • 1
    • 2
  • Jaeyun Kim
    • 1
  • Gaehang Lee
    • 3
  • Gi-Ra Yi
    • 1
  1. 1.Department of Chemical EngineeringSungkyunkwan UniversitySuwonKorea
  2. 2.SKKU Advanced Institute of Nanotechnology (SAINT)Sungkyunkwan UniversitySuwonKorea
  3. 3.Korea Basic Science InstituteDaejeonKorea

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