Micro-two-phase sheath flow method

The measurement of fast chemical reactions at the liquid-liquid interface is very difficult, since the reaction which starts just after the contact of two phases has to be measured. The dead time of the HSS method was several seconds and that of the two-phase stopped flow method was from few tenth millisecond to several hundred milliseconds. The micro-two-phase sheath flow method is the only method that can measure such fast interfacial reactions, which finish within 100 ps. An inner organic microflow was generated in an outer aqueous phase... 

The schematic drawing of the microsheath flow system combined with a laser-induced fluorescence measurement is shown in Fig. 5. The fast complex-ation rate of Zn(II) ion with 8-quinolinol (Hqn) or 5-octyloxymethyl-8-quinolinol (Hocqn) at the 1-butanol-water interface was measured by the micro-two-phase sheath flow method [33]. The diffusion length of Hocqn in the 1-butanol phase for 2ms was calculated as 0.8 pm, which is smaller than the experimental resolution depth of 2 pm in the microscopy used. Therefore, the observed rate... 

Recently, the micro-two-phase sheath flow method (Figure 10.3) has been invented. Fast interfaeial reactions, which proceeded in less than 1 millisecond, were measured using this method, coupled with fluorescence microspectroscopy. An inner organic micro-flow was generated in the aqueous phase flowing from the tip of a capillary (i.d.. 

Fig. 4. Schematic drawing of the laser fluorescence microscopy method for the measurement of fast interfacial reactions in micro-two-phase sheath flow systems.

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