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

Research output: Contribution to journalArticle

6 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

Fingerprint

Polymers
tetrahydrofuran
polymers
Scattering
color
Mie scattering
Refractive index
Sodium
sodium
refractivity
aqueous solutions
Color
Wavelength
Temperature
room temperature
matrices
scattering
wavelengths
temperature
hydroxypropylcellulose

Keywords

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

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry
  • Surfaces and Interfaces

Cite this

The Christiansen effect of brightly colored colloidal dispersion with an amphiphilic polymer. / Okoshi, Kento; Sano, Naoko; Okumura, Takamitsu; Tagaya, Akihiro; Magoshi, Jun; Koike, Yasuhiro; Fujiki, Michiya; Watanabe, Junji.

In: Journal of Colloid and Interface Science, Vol. 263, No. 2, 15.07.2003, p. 473-477.

Research output: Contribution to journalArticle

Okoshi, Kento ; Sano, Naoko ; Okumura, Takamitsu ; Tagaya, Akihiro ; Magoshi, Jun ; Koike, Yasuhiro ; Fujiki, Michiya ; Watanabe, Junji. / The Christiansen effect of brightly colored colloidal dispersion with an amphiphilic polymer. In: Journal of Colloid and Interface Science. 2003 ; Vol. 263, No. 2. pp. 473-477.
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