title: Novel thermo-responsive coloring phenomena in water/surfactant/oil emulsions.
abstract: Emulsions comprising a dual-surfactant system of a long-chain amidoamine derivative and a quaternary ammonium salt developed an iridescent color at a specific temperature region. The emulsions underwent phase inversion on heating from an O/W emulsion to a W/O emulsion, passing through a periodical lamellar structure which developed a characteristic interference color. Interestingly, the color and the coloring temperature can be independently controlled by adjusting the concentration of surfactants, respectively.
authors.affiliation: Department of Industrial Chemistry, Tokyo University of Science, 1-3 Kagurazaka, Tokyo 162-8601, Japan.
authors.forename: Clara
authors.initials: C
authors.lastname: Morita
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Aoyama
authors.forename: Yoshiro
authors.initials: Y
authors.lastname: Imura
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kawai