文献类型：期刊文献

英文题名：In situ analysis of dynamic laminar flow extraction using surface-enhanced Raman spectroscopy

作者：Wang, Fei[1];Wang, Hua-Lin[1];Qiu, Yang[1];Chang, Yu-Long[1];Long, Yi-Tao[2,3]

机构：[1]E China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Ass, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[3]E China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China

年份：2015

卷号：5

外文期刊名：SCIENTIFIC REPORTS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000367074300001)】；

基金：This research was supported by the sponsorship of the National Science Foundation for Distinguished Young Scholars of China (Grant No. 51125032).

语种：英文

摘要：In this study, we performed micro-scale dynamic laminar flow extraction and site-specific in situ chloride concentration measurements. Surface-enhanced Raman spectroscopy was utilized to investigate the diffusion process of chloride ions from an oil phase to a water phase under laminar flow. In contrast to common logic, we used SERS intensity gradients of Rhodamine 6G to quantitatively calculate the concentration of chloride ions at specific positions on a microfluidic chip. By varying the fluid flow rates, we achieved different extraction times and therefore different chloride concentrations at specific positions along the microchannel. SERS spectra from the water phase were recorded at these different positions, and the spatial distribution of the SERS signals was used to map the degree of nanoparticle aggregation. The concentration of chloride ions in the channel could therefore be obtained. We conclude that this method can be used to explore the extraction behaviour and efficiency of some ions or molecules that enhance the SERS intensity in water or oil by inducing nanoparticle aggregation.