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Photofunctional Characteristics at Interfaces

界面处的光功能特性

基本信息

批准号：
14050001
负责人：
KITAMURA Noboru
金额：
$ 21.89万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2006
项目状态：
已结题

项目摘要

Irradiation of a focused 1064 nm laser beam to an aqueous butanol solution under an optical microscope gives rise to formation of a single butanol microdroplet through photo-thermal phase separation of the solution. Simultaneously, the butanol microdroplet produced can be manipulated in space by the 1064 nm laser beam and studied by fluorescence/Raman microspectroscopies. The particular technique was also combined successfully with a microchip as well as with a capillary electrophoresis. On the basis of such a new developed technique, an ultra-race amount of an analyte in an aqueous butanol solution can be extracted into a single picoliter butanol droplet by laser irradiation and the liquid/liquid extraction processes of the analyte have been studied in detail on the basis of fluorescence microspectroscopy. In the case of the use of a microchip, in particular, consecutive and automatic liquid/liquid extraction of an analyte into a single droplet has been achieved by a laser beam. Furth … More ermore, the analyte separated by a capillary electrophoresis has been extracted and analyzed by the present methodology, which has high potential as a novel technique for microanalytical chemistry.On the other hand, gold electrodes modified with a ferrocene-terminated alkanethiol self-assembled monolayer (SAM) have been successfully integrated into a polymer microchannel chip. On the basis of oxidation-reduction reactions of the ferrocenyl groups in the SAM, electrochemical flow control of the solution in a microchannel has been demonstrated. The fundamental mechanisms of the electrochemical flow control in the microchannel chip have been also elucidated on the basis of contact angle measurements and surface-enhanced infrared absorption spectroscopy. The study has demonstrated that a perchlorate anion as a counter ion of the ferrocenium cation adsorbed simultaneously onto the SAM surface upon the electrochemical oxidation of the ferrocenyl group in the SAM and this accompanies adsorption of water molecules on the SAM surface, giving rise to the increase in the wettability of the SAM/electrode surface. Upon reduction of the ferrocenyl group, a perchlorate ion and water molecules distribute to the water phase. Through adsorption/desorption of a perchlorate ion and water molecule, the surface wettability can be controlled electrochemically. Less

在光学显微镜下，聚焦1064 nm激光束照射丁醇水溶液，通过溶液的光热相分离，形成单个丁醇微滴。同时，制备的丁醇微液滴可在1064 nm激光束下进行空间操纵，并可通过荧光/拉曼显微光谱进行研究。这种特殊的技术也成功地与微芯片以及毛细管电泳相结合。在此基础上，利用激光照射将丁醇水溶液中的超痕量分析物提取到单个皮升丁醇液滴中，并在荧光显微光谱的基础上对分析物的液/液萃取过程进行了详细的研究。特别是在使用微芯片的情况下，通过激光束可以实现分析物连续和自动的液/液萃取成单个液滴。此外，毛细管电泳分离出的分析物也可以用该方法进行提取和分析，这是一种极具潜力的微量分析化学新技术。另一方面，用端部为二茂铁的烷硫醇自组装单层（SAM）修饰的金电极已成功集成到聚合物微通道芯片中。以二茂铁基在SAM中的氧化还原反应为基础，证明了微通道中溶液的电化学流动控制。基于接触角测量和表面增强红外吸收光谱分析，阐明了微通道芯片中电化学流动控制的基本机理。研究表明，在二茂铁基的电化学氧化过程中，高氯酸盐阴离子作为二茂铁阳离子的反离子同时吸附到SAM表面，并伴随着水分子在SAM表面的吸附，导致SAM/电极表面的润湿性增加。二茂铁基还原后，高氯酸盐离子和水分子分布到水相。通过高氯酸盐离子和水分子的吸附/解吸，可以电化学控制表面润湿性。少