Tantalum network nanoparticles from a Ta2O5+kMg system by liquid magnesium controlled combustion

Abstract

In this study, tantalum network nanoparticles are prepared from a Ta2O5 +kMg system via a liquid magnesium-controlled combustion reaction. Super-stoichiometric amounts of magnesium are used in the preparation of a reaction mixture to produce a liquid magnesium pool capable of lowering the combustion temperature and leading to the formation of Ta network structures. The heat transfer kinetics from the hot reaction zone of 'cold' Mg particles is determined using heat transfer-coupled fluid dynamics simulation software. The formation of network structures is characterized through SEM, TEM, XRD, and BET analysis techniques. The mechanism of network formation is explained based on solid particle collisions in liquid media. Our method is able to produce Ta network structures in which the size of individual particles ranges between 50 and 700 nm. (c) 2020 The Combustion Institute. Published by Elsevier Inc. All rights reserved.