A Study on Dynamical Aspects of Analytical Reactions

本研究人员开发的激光捕获光谱-电化学技术与皮秒显微光谱技术相结合，研究了分析科学和分离科学中几个基本关键反应的动力学行为。离子交换动力学：在过去的几十年里，聚合物树脂珠中的离子交换反应得到了广泛的研究。然而，基于单个聚合物珠测量的离子交换过程的直接观察从未被探索过。将上述新技术成功地应用于单微米级聚合物小球的离子交换动力学研究。在直接测量离子交换过程随聚合物的交联度、离子交换基团的反离子性质、温度等变化的基础上，详细阐述了决定离子交换反应的因素。液/液界面动力学：Characteris…在全内反射荧光光谱和动态荧光各向异性的基础上，研究了液/液界面更多的TiC行为。在水/四氯化碳和水/二氯乙烷界面的情况下，水/四氯化碳界面的界面层比水/二氯乙烷界面的界面层薄。类似的实验方法被用来阐明水/邻苯二甲酸酯界面的特征。从油本身的分子结构角度对实验结果进行了讨论。微滴/溶液界面化学的动力学方面：激光捕获-微化学技术显示了微滴尺寸对油滴/水界面的电子转移和质量转移速率的影响。液滴大小效应也证实了染料分子在单个液滴中的分子缔合以及染料在单个微滴中的荧光寿命。较少

A laser trapping-spectroscopy-electrochemistry technique, developed by the present researchers, was combined the with picosecond microspectroscopy to study dynamical behaviors of several fundamental key reactions employed in analytical science and separation science.1. Ion-Exchange Dynamics : Ion-exchange reactions in polymeric resin beads have been extensively studied among past decades. Nonetheless, direct observation of the ion-exchange processes based on single polymer beads measurements has never been explored. The new echnique mentioned above was applied successfully to elucidate ion-exchange dynamics in single micrometer-sized polymer beads. On the basis of direct measurements of the ion-exchange processes as a function of the cross-linking density of the polymer, the nature of the counter ion of the ion-exchangeable group, temperature, and so forth, the factors determining the ion-exchange reactions were elucidated in detail.2. Dynamics at Liquid/Liquid Interfaces : Characteris … More tic behaviors occurring at liquid/liquid interfaces were studied on the basis of total-internal reflection fluorescence spectroscopy as well as by dynamic fluorescence anisotropy. In the case of water/carbon tetrachloride and water/dichloroethane interfaces, it has been demonstrated that the interfacial layer is thinner for the water/carbon tetrachloride interface as compared with that at the water/dichloroethane interface. Analogous experimental approaches were applied to elucidate characteristics at water/phthalate ester intefaces. The results were discussed in terms of the molecular structures of the oil itself.3. Dynamical Aspect of the Chemistry at Microdroplet/Solution Interfaces : The laser trapping-microchemistry technique demonstrated micrometer droplet size effects on electron transfer and mass transfer rates at oil droplet/water interfaces. Droplet size effects were also confirmed for molecular association of dye molecules in single droplets as well as for fluorescence lifetime of a dye in individual microdroplets. Less