The Christiansen effect of brightly colored colloidal dispersion with an amphiphilic polymer

Kento Okoshi, Naoko Sano, Takamitsu Okumura, Akihiro Tagaya, Jun Magoshi, Yasuhiro Koike, Michiya Fujiki, Junji Watanabe

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8 Citations (Scopus)

Abstract

A novel coloration phenomenon in a colloidal dispersion with an amphiphilic polymer was found. The dispersion consists of tetrahydrofuran (THF), an aqueous solution of sodium thiosulfate (Na2S2O3·5H2O), and hydroxypropylcellulose (HPC). The dispersion was emulsified by HPC as an amphiphilic polymer, so that the aqueous phase was confined in droplets in the THF matrix. It typically appeared bluish violet at room temperature and turned into blue with increasing temperature. In this system, the refractive indices of the inside and outside of the droplet coincided at a certain wavelength at which the light passes through without scattering, which is called the Christiansen effect. The color observed was successfully simulated by Mie's scattering theory in combination with the Christiansen effect.

Original languageEnglish
Pages (from-to)473-477
Number of pages5
JournalJournal of Colloid And Interface Science
Volume263
Issue number2
DOIs
Publication statusPublished - 2003 Jul 15

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Keywords

  • Christiansen effect
  • Colloid
  • Coloration
  • Hydroxypropylcellulose
  • Mie scattering

ASJC Scopus subject areas

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

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