Ghaleb Khalil Abbas, Stephan Khaled, Pittet Patrick, Ferrigno Rosaria, Georges Joseph
Laboratoire des Sciences Analytiques, UMR 5180, Bât. CPE-308D, Domaine Scientifique de la Doua, Université Claude Bernard-Lyon 1, 69622 Villeurbanne Cedex, France.
Appl Spectrosc. 2006 May;60(5):564-7. doi: 10.1366/000370206777412211.
This work investigates the efficiency of a chaotic micromixer using thermal lens spectrometry. The outlet of the mixing device was connected to a thermal lens detection head integrating the probe beam optical fibers and the sample capillary. The chaotic micromixer consisted of a Y-shaped poly(dimethylsiloxane) (PDMS) microchip in which ribbed herringbone microstructures were etched on the floor of the main channel. Due to the solvent composition dependence of the thermal lens response, the photothermal method was shown to be highly sensitive to nonhomogeneous mixing compared to fluorescence detection. The apparatus was applied to the determination of Fe2+ with 1,10-phenanthroline using flow injection analysis; a limit of detection of 11 microg L(-1) of iron was obtained.
本研究利用热透镜光谱法探究了一种混沌微混合器的效率。混合装置的出口连接至一个集成了探测光束光纤和样品毛细管的热透镜检测头。该混沌微混合器由一个Y形聚二甲基硅氧烷（PDMS）微芯片组成，在主通道底部蚀刻有肋状人字形微结构。由于热透镜响应对溶剂组成的依赖性，与荧光检测相比，光热法对非均匀混合表现出高度敏感性。该装置应用于采用流动注射分析用1,10 - 菲啰啉测定Fe2 +；获得了铁的检测限为11 μg L(-1)。
