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

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Carbon-embedded ordered macroporous titania (C-MAC TiO 2 ) 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 (EO 125 -b-PO 64 -b-EO 125 ) 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 TiO 2 significantly suppresses strong multiple scattering from structural defects or imperfections, thus emphasizing their Bragg reflection colors.

Original languageEnglish
Pages (from-to)2138-2144
Number of pages7
JournalKorean Journal of Chemical Engineering
Volume35
Issue number10
DOIs
Publication statusPublished - 2018 Oct 1
Externally publishedYes

Keywords

  • Inverse Opal
  • Macropore
  • Sphere
  • Structural Color
  • Titania

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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