Synthesis, transfer, and characterization of core-shell gold-coated magnetic nanoparticles
| Autor: | Maureen McKeague, Maria C. DeRosa, McKenzie Smith |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Gold-coated
Materials science Absorption spectroscopy Clinical Biochemistry Nanoparticle phase transfer Nanoparticle Aqueous phase transfer 4-Dimethyl(amino)pyridine 010501 environmental sciences TMAOH tetramethylammonium hydroxide 01 natural sciences HR-TEM high-resolution transmission electron microscopy Magnetic separation Fe3O4-AuNPs 03 medical and health sciences chemistry.chemical_compound Synthesis Solvothermal synthesis of iron oxide nanoparticles with direct gold coating to form core-shell gold-coated magnetic nanoparticles Pyridine Iron oxide Solvothermal Solubility Thin gold coating lcsh:Science 030304 developmental biology 0105 earth and related environmental sciences ComputingMethodologies_COMPUTERGRAPHICS Core-shell 0303 health sciences Aqueous solution DMAP 4-dimethyl(amino)pyridine Fe3O4-AuNPs core-shell gold-coated magnetic nanoparticles Phase transfer of core-shell gold-coated magnetic nanoparticles from organic to aqueous using 4-(dimethyl)amino pyridine (DMAP) as a phase transfer agent Medical Laboratory Technology Chemistry chemistry Chemical engineering (HR-TEM/EDS) high-resolution transmission electron microscopy with energy-dispersive X-ray spectroscopy DMAP Transmission electron microscopy Core-shell gold-coated magnetic nanoparticles Magnetic nanoparticles lcsh:Q Phase-transfer catalyst |
| Zdroj: | MethodsX MethodsX, Vol 6, Iss, Pp 333-354 (2019) |
| ISSN: | 2215-0161 |
| Popis: | Graphical abstract Magnetic separation has gained new popularity as a versatile partitioning method with the recent growth in nanotechnology and related biotechnology applications. In this study, iron oxide magnetic nanoparticles were synthesized via solvothermal methods and directly coated with gold to form core-shell gold-coated magnetic nanoparticles (Fe3O4-AuNPs). High-resolution transmission electron microscopy with Energy dispersive X-ray spectroscopy results suggests that temperature and reaction time play an important role in the formation of small, monodisperse Fe3O4-AuNPs. We also demonstrate that increased 4- dimethyl(amino)pyridine (DMAP) concentrations and vigorous stirring were required to successfully transfer Fe3O4-AuNPs into aqueous solution. The structure and morphology of the synthesized and transferred Fe3O4-AuNPs was further confirmed by UV–vis absorption spectroscopy and solubility experiments. • Direct coating of Fe3O4 with Au: Slowly heating by (10 °C/ min) until 180–190 °C without exceeding this reaction temperature and increasing the reaction time to 3 h from 1.5 h • High yield transfer of Fe3O4-AuNPs was achieved using 4- dimethyl(amino)pyridine (DMAP) as phase transfer catalyst |
| Databáze: | OpenAIRE |
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