title: Liquid/liquid optical waveguides using sheath flow as a new tool for liquid/liquid interfacial measurements.
abstract: A liquid/liquid optical waveguide was constructed using a sheath flow. Since the refractive index of an organic solvent is generally higher than that of water (nD = 1.33), light introduced into the inner organic flow should proceed with total multi-reflection within the inner flow, so that the inner part of the sheath flow acts as the core of an optical waveguide. This sheath flow liquid/liquid optical waveguide was stable and showed no substantial background scattering. Moreover, it is applicable to both miscible and immiscible liquid/ liquid interfaces. Thus, it may become a new tool for studying liquid/liquid interfaces as well as for sensitive optical measurements.
authors.affiliation: Department of Chemistry, Faculty of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu 376-8515, Japan.
authors.forename: Hiromi
authors.initials: H
authors.lastname: Takiguchi
authors.forename: Tamao
authors.initials: T
authors.lastname: Odake
authors.forename: Manabu
authors.initials: M
authors.lastname: Ozaki
authors.forename: Tomonari
authors.initials: T
authors.lastname: Umemura
authors.forename: Kin-ichi
authors.initials: K
authors.lastname: Tsunoda
mesh_terms: D005453:Fluorescence; D055095:Optics and Photonics / Q000295:instrumentation*; D012212:Rheology; D012542:Scattering, Radiation; D012996:Solutions / Q000737:chemistry*
chemical_list: D012996:Solutions