Bulk Synthesis of Monodisperse Magnetic FeNi<SUB>3</SUB> Nanopowders by Flow Levitation Method

Abstract

In this work, a novel bulk synthesis method for monodisperse FeNi3 nanoparticles was developed by flow levitation method (FL). The Fe and Ni vapours ascending from the high temperature levitated droplet was condensed by cryogenic Ar gas under atmospheric pressure. X-ray diffraction was used to identify and characterize the crystal phase of prepared powders exhibiting a FeNi3 phase. The morphology and size of nanopowders were observed by transmission electron microscopy (TEM). The chemical composition of the nanoparticles was determined with energy dispersive spectrometer (EDS). The results indicated that the FeNi3 permalloy powders are nearly spherical-shaped with diameter about 50-200 nm. Measurement of the magnetic property of nanopowders by a superconducting quantum interference device (SQUID, Quantum Design MPMS-7) showed a symmetric hysteresis loop of ferromagnetic behavior with coercivity of 220 Oe and saturation magnetization of 107.17 emu/g, at 293 K. At 5 K, the obtained saturation magnetization of the sample was 102.16 emu/g. The production rate of FeNi3 nanoparticles was estimated to be about 6 g/h. This method has great potential in mass production of FeNi3 nannoparticles.

Pharmacological Modulators of Tau Aggregation and Spreading

“…Three different types of tau aggregates strongly correlate with neuronal degeneration: the neurofibrillary tangles (NFTs) in neuronal somata, which is the primary cause of neurodegeneration in a number of tauopathies, neuropil threads (NTs) in neuronal dendrites, and neuritic plaques (NPs) [58,59] ( Figure 1A). In particular, the density of NFTs correlates fairly well with regional and global aspects of cognitive decline during the progression of AD [60,61]. Although the presence of neurofibrillary tangles in tau inclusions is a critical biomarker for the pathological diagnosis of AD patients, AD is considered as a secondary tauopathy, due to the combined deposits consisting of intracellular NFTs and of extracellular amyloid-β (Aβ) plaques [62][63][64].…”

Bulk Synthesis and Characterization of Ti3Al Nanoparticles by Flow‐Levitation Method

“…Sivaprahasam et al used this method for the synthesis of FeCu nanopowders [18]. Recently, we developed this method for the synthesis of intermetallic Ag 2 Al, FeAl, and FeNi 3 nanoparticles [19][20][21]. In comparison to the conventional evaporation-condensation methods, the main advantages of the FL method are high purity of the product (due to the containerless nature of the process) and high production rate (due to the rapid heating and continuous manner of the method).…”