二相マイクロフロー系液液界面における高速反応初期過程の速度論的研究
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概要
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A novel method, named two-phase sheath flow/fluorescence microscopy, was developed to investigate the initial stage of fast reactions at a liquid/liquid interface. The organic phase was flowed from a micro-capillary inserted into the aqueous sheath flow, and formed a cylindrical flow, of which the diameter was 5∿20 μm. An excitation laser beam was irradiated to the organic phase flow through a microscope objective, and the emitted fluorescence was detected with an ICCD camera, or a streakscope. The rate of fast complexation at a liquid/liquid interface was measured. A digital simulation, in which the diffusion, complexation, and interfacial adsorption constants were incorporated, was used to analyze the reaction kinetics. It was revealed that the complexation of zinc (II) with 5-octlyoxymethyl-8-quinolinol was delayed by the dissolution of water into the 1-butanol phase just after the contact of two phases (0.1∿2 ms). In the synergistic extraction of samarium (III) with 4, 4, 4-trifluoro-1-(2-thienyl)-1, 3-butanedione (Htta) and tri-n-octylphosphine oxide (topo), the reaction intermediate, Sm (tta)_3(topo)(H_2O)_2 was successfully detected by means of a fluorescence lifetime measurement at the initial stage of complexation (1∿30 μs). The lactone cleavage reactions of rhodamine dye at the liquid/liquid interface were investigated by two-photon excitation fluorescence microscopy. The rate constants of the cleavage reaction at the interface were determined.
- 社団法人日本分析化学会の論文
- 2005-02-05