"I would like to discover the interconnectedness of scientists and communities, akin to molecular bonds, reflecting chemistry's role in collaboration and transformation… I lose track of time when I am in the state of flow, immersed in work I'm passionate about…" Find out more about Yi-Hsin Liu in his Introducing… Profile.
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Unexpected Magnetic Moments in Manganese-Doped (CdSe) Nanoclusters: Role of Ligands.
Angew Chem Int Ed Engl
December 2024
Department of Chemistry, National Taiwan Normal University, Taipei, 11677, Taiwan, ROC.
This study explores the enhancement in magnetic and photoluminescence properties of Mn-doped (CdSe) nanoclusters, significantly influenced by the introduction of paramagnetic centers through doping, facilitated by optimized precursor chemistry and precisely controlled surface ligand interactions. Using a cost-effective and scalable synthesis approach with elemental Se and NaBH (Se-NaBH) in n-octylamine, we tailored bonding configurations (Cd-O, Cd-N, and Cd-Se) on the surface of nanoclusters, as confirmed by EXAFS analysis. These bonding configurations allowed for tunable Mn-doping with tetrahedral coordination, further stabilized by hydrogen-bonded acetate ligands, as evidenced by C NMR and IR spectroscopy.
View Article and Find Full Text PDFWastewater-based epidemiology to monitor 68 NPS/conventional drug use in Taipei metropolitan area in Taiwan during and after COVID-19 pandemic.
J Hazard Mater
September 2024
Graduate Institute of Toxicology, National Taiwan University College of Medicine, National Taiwan University, Taipei, Taiwan. Electronic address:
Amidst far-reaching COVID-19 effects and social constraints, this study leveraged wastewater-based epidemiology to track 38 conventional drugs and 30 new psychoactive substances (NPS) in northern Taiwan. Analyzing daily samples from four Taipei wastewater plants between September 2021 and January 2024-encompassing club reopenings, holidays, Lunar New Year, an outbreak, and regular periods-thirty-one drugs were detected, including 5 NPS. Tramadol, zolpidem tartrate, CMA, and MDPV were newly detected in Taiwanese sewage with frequency of 1.
View Article and Find Full Text PDFStreamlining regular liquid chromatography with MALDI-TOF MS and NMR spectroscopy using automatic full-contact splitless spotting interface and flash-tap fractioning collection.
Anal Chim Acta
April 2024
Institute of Toxicology, College of Medicine, National Taiwan University, Taipei, Taiwan. Electronic address:
Background: High-resolution matrix-assisted laser desorption/ionization-time of flight mass spectrometry (MALDI-TOF MS) and nuclear magnetic resonance (NMR) spectroscopy are powerful tools to identify unknown psychoactive substances. However, in complex matrices, trace levels of unknown substances usually require additional fractionation and concentration. Specialized liquid chromatography systems are necessary for both techniques.
View Article and Find Full Text PDFExtended Magnetic Reconnection in Kinetic Plasma Turbulence.
Phys Rev Lett
August 2023
School of Natural Sciences, Institute for Advanced Study, Princeton, New Jersey 08544, USA.
Magnetic reconnection and plasma turbulence are ubiquitous processes important for laboratory, space, and astrophysical plasmas. Reconnection has been suggested to play an important role in the energetics and dynamics of turbulence by observations, simulations, and theory for two decades. The fundamental properties of reconnection at kinetic scales, essential to understanding the general problem of reconnection in magnetized turbulence, remain largely unknown at present.
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