title: Development of Tetrahydrofuran/Water Optical Waveguide and Its Application to the Observation of Extraction Behavior of 1-Anilino-8-naphtalene Sulfonate at the Tetrahydrofuran/Water Interface.
abstract: A stable two-phase sheath flow using tetrahydrofuran (THF) for an inner flow and water for an outer flow was formed in a glass capillary, and worked as a stable liquid-core/liquid-cladding optical waveguide (THF/water LLW). Although THF and water were miscible with any ratio, the length of the stable THF/water LLW at 0.9 - 2.1 cm s-1reached at least 150 mm. The THF/water LLW was applied to the observation of extraction behavior of solvatochromic fluorescence dye, 1-anilino-8-naphtalene sulfonate (ANS), through the THF/water interface. ANS was added to the water phase (clad solution) and its fluorescence, which was excited with the guided light (355 nm) through the LLW, was observed by changing the position of the detector. While the ANS stayed in the region of 70% THF to the end of the LLW without the addition of cationic surfactant, hexadecyltrimethylammonium ion (CTA+) at pH 3 and 11, the ion-pair of ANS and CTA+was extracted into the higher concentration region of THF with the addition of CTA+at pH 11.
authors.affiliation: Graduate School of Engineering, The University of Tokyo.
authors.forename: Hiromi
authors.initials: H
authors.lastname: Takiguchi
authors.forename: Soto
authors.initials: S
authors.lastname: Asanuma
authors.forename: Junya
authors.initials: J
authors.lastname: Kamiyama
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Murata
authors.forename: Yuki
authors.initials: Y
authors.lastname: Hasegawa
authors.forename: Satoshi
authors.initials: S
authors.lastname: Yoshizawa
authors.forename: Hiroki
authors.initials: H
authors.lastname: Hotta
authors.forename: Tamao
authors.initials: T
authors.lastname: Odake
authors.forename: Tomonari
authors.initials: T
authors.lastname: Umemura
authors.forename: Kiichi
authors.initials: K
authors.lastname: Sato
authors.forename: Kin-Ichi
authors.initials: KI
authors.lastname: Tsunoda