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- W1969112069 abstract "Abstract In this study, superparamagnetic iron oxide nanoparticles (SPION) were synthesized by coprecipitation of FeSO 4 ·7H 2 O and FeCl 3 ·6H 2 O with NH 4 OH at different temperatures and iron salt concentrations. The results showed that magnetite nanoparticles synthesized at elevated temperature (70 °C) and moderate salt concentration (0.012 M for FeCl 3 ) had the highest saturation magnetization (67.8 emu/g) with the size of about 9 nm. The optimal magnetite nanoparticles with the lowest aggregation and highest magnetic behaviour were coated by polyamidoamine (PAMAM) dendrimer. The samples were characterized with X-ray diffractometry (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, UV–vis spectroscopy, fluorescent spectroscopy and magnetization measurements (VSM). The coated materials illustrated strong magnetic behaviour and XRD pattern like magnetite. The presence of Fe O Si bond in FTIR spectra confirmed the formation of thin APTS layer on the surface of magnetite nanoparticles. Energy-dispersive X-ray spectroscopy (EDS) and thermogravimetric analysis (TGA) indicated that the modification of core synthesis technique can raise the efficiency of aminosilane coating reaction (as an initiator for PAMAM dendrimer) up to 98% with the production of about 610 dendritic arms. TGA and FTIR spectra of PAMAM-grafted nanoparticles also verified the perfection of repetitive Michael addition and amidation reactions. The fluorescence spectrum displayed the excitation and emission peaks around 298 and 328 nm, respectively for PAMAM-grafted nanoparticles. We believe the resultant material showed the fluorescent properties which could be an applicable and powerful tool for biomedical diagnostic applications." @default.
- W1969112069 created "2016-06-24" @default.
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- W1969112069 date "2013-08-01" @default.
- W1969112069 modified "2023-09-30" @default.
- W1969112069 title "An efficient method of SPION synthesis coated with third generation PAMAM dendrimer" @default.
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- W1969112069 doi "https://doi.org/10.1016/j.colsurfa.2013.04.003" @default.
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