Synthesis of spherical polymer and titania photonic crystallites

Sascha M. Klein, Vinothan N. Manoharan, David J. Pine, Fred F. Lange

Research output: Contribution to journalArticle

Abstract

The fabrication of small structured spherical particles that are essentially small photonic crystals is described. The particles are 1-50 μm in diameter and are porous with nearly close-packed monodisperse pores whose size is comparable to the wavelength of light. The solid matrix of the particles is titania, which provides a large refractive index contrast between the particle matrix and pores. The particles are made by encapsulating polymer colloidal particles in emulsion droplets of hexanes in which a titanium alkoxide precursor is dissolved. Subsequent osmotic removal of the hexanes from the droplets and condensation of the alkoxide precursor leads to spherical aggregates of polymer spheres with titania filling the spaces between the polymer spheres. The polymer particles are then burned out leaving behind the desired porous titania particles. The size and structure of the pores and high refractive index of the titania matrix are expected to produce particles that are very efficient scatterers of light, making them useful as pigments.

Original languageEnglish (US)
Pages (from-to)6669-6674
Number of pages6
JournalLangmuir
Volume21
Issue number15
DOIs
StatePublished - Jul 19 2005

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Crystallites
Photonics
crystallites
Polymers
titanium
Titanium
photonics
polymers
Hexanes
synthesis
Refractive index
Hexane
Photonic crystals
Emulsions
alkoxides
Pigments
Pore size
porosity
Condensation
matrices

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Synthesis of spherical polymer and titania photonic crystallites. / Klein, Sascha M.; Manoharan, Vinothan N.; Pine, David J.; Lange, Fred F.

In: Langmuir, Vol. 21, No. 15, 19.07.2005, p. 6669-6674.

Research output: Contribution to journalArticle

Klein, SM, Manoharan, VN, Pine, DJ & Lange, FF 2005, 'Synthesis of spherical polymer and titania photonic crystallites', Langmuir, vol. 21, no. 15, pp. 6669-6674. https://doi.org/10.1021/la0469957
Klein, Sascha M. ; Manoharan, Vinothan N. ; Pine, David J. ; Lange, Fred F. / Synthesis of spherical polymer and titania photonic crystallites. In: Langmuir. 2005 ; Vol. 21, No. 15. pp. 6669-6674.
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