Synthesis of nanopowders of titanium compounds via Flow-Levitation method and study their properties

Abstract

Nanopowders of titanium compounds TiH2 and TiC are synthesized via Flow-Levitation method using in situ reaction of nascent titanium nanoparticles with the proper reactants. The influence of manufacturing parameters on the composition and the internal structure of the synthesized nanoparticles is examined. Study of TiH2 nanoparticles using thermal methods revealed hydrogen evolution within the narrow temperature range (390-510°C), while hydrogen evolution temperature of the commercial samples is higher than 500°C.

Vaporization-Controlled Energy Release Mechanisms Underlying the Exceptional Reactivity of Magnesium Nanoparticles

“…Electromagnetic levitation presents one such vapor-phase approach to high surface-to-volume, high surface energy nanoparticles with tunable sizes and morphologies. , Using this method, through controlled bulk metal evaporation, we demonstrate the formation of surface-pure Mg NPs with tunable sizes from ∼40 to 500 nm and evaluate their potential as a primary solid fuel with different solid-state oxidizers (KClO 4 , Bi 2 O 3 , and CuO) spanning a range of oxygen release profiles. Across all the explored sizes and oxidizers, we show that Mg NP-based energetic composites demonstrate lower oxidation/reaction onset temperatures and up to ∼10-fold higher reaction rates than the benchmark nano-Al-based formulations.…”

Magnetic-Field Directed Vapor-Phase Assembly of Low Fractal Dimension Metal Nanostructures: Experiment and Theory

“…Although several levitation-based synthetic approaches have been reported for metal nanoparticle synthesis, particle characterization has been mostly limited to synthesis and bulkcharacterization of nanoparticles, while the control on aggregate architecture and assembly has been vastly neglected. 28,29,31 In this work, we explore electromagnetic levitation coupled with inductive heating for the formation of different metal nanoparticles and their aggregate assemblies, with a focus on characterization and on-the-fly tuning of aggregate morphology and structure.…”

“…Electromagnetic levitation and heating of bulk metal droplets presents a promising and relatively straightforward method to achieve metal-evaporation and gas-phase production of metal nanoparticles. − In addition, the levitation magnetic field employed in this technique can offer the desired directionality during nanoparticle formation and aggregation, particularly for ferromagnetic metal nanoparticles. Although several levitation-based synthetic approaches have been reported for metal nanoparticle synthesis, particle characterization has been mostly limited to synthesis and bulk-characterization of nanoparticles, while the control on aggregate architecture and assembly has been vastly neglected. ,, In this work, we explore electromagnetic levitation coupled with inductive heating for the formation of different metal nanoparticles and their aggregate assemblies, with a focus on characterization and on-the-fly tuning of aggregate morphology and structure.…”