【19th.Apr.】Chemosensor combining VFD technology and AIE feature for anionic surfactant detection
日期：2019-04-19
閱讀：1041
題目：Chemosensor combining VFD technology and AIE feature for anionic surfactant detection
演講人：唐友宏，Associate Professor, Flinders University, Australia.
時間：4月19日（星期五），下午14:00
地點：化學樓A-518會議室
邀請人：袁望章 研究員
Abstract：
?A smartphone app-based monitoring tool was developed for the detection of anionic surfactants (AS), including per?uorooctanoic acid (PFOA) and per?uorooctane sulfonate (PFOS). Akin to the methylene blue active substances (MBAS), liquid-phase extraction (LPE) is employed to extract the hydrophobic ionpair of dye (ethyl violet)-AS to an organic phase (ethyl acetate).?
The colour (RGB) of the organic phase is read using a smartphone camera with the help of a reading kit. The value of RGB is carefully corrected and linked to the concentration of ASs with a standard deviation of <10% in the 10-1000 ppb (part per billion) range.?
With the vortex fluid device (VFD) technology, the effectiveness of LPE process has significantly increased, which can decrease the ASs detection concentration 100-600 times and significantly decrease the extraction time to less than 1 minute with the same smartphone app.?
In order to avoid the interference arising from inorganic anions, such as those found in tap water and groundwater, the water sample is pre-treated by dual liquid-phase extraction (dual-LPE), which takes ~5 min.?
The organic phase of the ?rst LPE (equilibrium with water sample) is transferred and subjected to a second LPE (equilibrium with Milli-Q water) to remove any potential background interference.?
Consequently, the smartphone app can detect PFOA spiked in tap/groundwater with an LOD of 10 ppb (~12 nM, dual-LPE of ~5 min), suggesting that it has the potential to succeed as a pre-screening tool for on-site application and in common laboratory tests. Further/future development has also been discussed in this presentation.
報告人簡介：
Dr Youhong Tang is an associate professor and was an Australian Research Council-Discovery Early Career Researcher (ARC-DECRA) fellow at Flinders University. He is a research leader in Institute for NanoScale Science and Technology (ERA rank 5 in nanotechnology) and Medical Device Research Institute (ERA rank 4 in biomedical engineering). He obtained his PhD degree in the Hong Kong University of Science and Technology (HKUST) in 2007. He moved to Flinders University in 2012 from Centre for Advanced Materials Technology, the University of Sydney.?
He is a material science and engineering researcher with research interests mainly focused on (1) Structure-processing-property relationship of polymeric (nano)materials; (2) Biomaterials, biosensors and their devices with aggregation-induced emission features. In the last 5 years, he has published >120 SCI journal papers, 9 book chapters and 2 books and has secured 5 funds from Australia Research Council, 1 fund from Australian Solar Thermal Research Initiative and 3 funds from South Australian Government.
For the detail information, please refer to http://www.flinders.edu.au/people/youhong.tang
