首页> 外文期刊>Langmuir: The ACS Journal of Surfaces and Colloids >Lactone Cleavage Reaction Kinetics of Rhodamine Dye at Liquid/Liquid Interfaces Studied by Micro-Two-Phase Sheath Flow/Two-Photon Excitation Fluorescence Microscopy
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Lactone Cleavage Reaction Kinetics of Rhodamine Dye at Liquid/Liquid Interfaces Studied by Micro-Two-Phase Sheath Flow/Two-Photon Excitation Fluorescence Microscopy

机译:微两相鞘流/双光子激发荧光显微镜研究若丹明染料在液/液界面的内酯裂解反应动力学

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Two-photon excitation fluorescence microscopy was combined with the two-phase microflow system in order to measure the fast interfacial reaction rate at liquid/liquid interfaces.The lactone cleavage kinetics of octadecylrhodamine B (C_(18)RB) at the toluene/water and heptane/water interfaces was studied by this new method.The organic solution containing the nonfluorescent lactone of C_(18)RB was made to flow as an inner flow with an aqueous outer sheath flow.The diameter of the inner flow was <20 mum.A focused fundamental beam of a Ti:sapphire pulse laser of 780 nm was irradiated to the interface,and emitted fluorescence from the fluorescent product was detected by a charge-coupled device (CCD) camera or a streakscope.The increase in the concentration of the fluorescent form of C_(18)RB was measured along the interface of the inner flow of the toluene/water and heptane/water systems for 80 mus just after the contact of two phases.The analysis made by the time-dependent Langmuir adsorption model with the aid of the digital simulation method gave the cleavage reaction rate constants of the lactone form of C_(18)RB at the liquid/liquid interfaces.
机译:为了测量液/液界面的快速界面反应速度,将双光子激发荧光显微镜与两相微流系统结合使用。十八烷基若丹明B(C_(18)RB)在甲苯/水和水中的内酯裂解动力学用这种新方法研究了庚烷/水的界面,使含有C_(18)RB的非荧光内酯的有机溶液以内部流的形式流动,而外部水鞘流为内部流,内部流的直径小于20微米。将780 nm的Ti:蓝宝石脉冲激光的聚焦基本光束照射到界面上,并通过电荷耦合器件(CCD)相机或条纹镜检测荧光产物发出的荧光。在两相接触后,沿甲苯/水和庚烷/水系统内部流动的界面测量了C_(18)RB的荧光形式,持续80亩。时变的Langmuir吸附剂进行了分析离子模型借助于数字模拟方法给出了C /(18)RB内酯形式在液/液界面处的裂解反应速率常数。

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