Monodisperse, high refractive index, highly charged ZnS colloids self assemble into crystalline colloidal arrays

Jia Luo, Dan Qu, Alexander Tikhonov, Justin Bohn, Sanford A. Asher

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

We developed an efficient synthesis of monodisperse, highly surface charged, high refractive index ZnS spherical particles by using a gel-sol method. Concentrated solutions of zinc-ammonia-NTA (nitrilotriacetic acid) were reacted with thioacetamide in the presence of gelatin which stabilized the growing particles. We dramatically increased the particle surface charge density by condensing silica and silylated phosphonate groups on the particle surface. These monodisperse highly charged ZnS particles are somewhat porous and have a refractive index of 1.868. These are the highest refractive index, monodisperse, highly charged spherical particles to self assemble into non-close-packed crystalline colloidal arrays which Bragg diffract light.

Original languageEnglish
Pages (from-to)131-137
Number of pages7
JournalJournal of Colloid and Interface Science
Volume345
Issue number2
DOIs
Publication statusPublished - May 1 2010
Externally publishedYes

Keywords

  • High refractive index
  • Monodisperse
  • Photonic crystal
  • Surface charge

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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