Physicochemical properties of Al2O3 and Y2O3 nanopowders produced by laser synthesis and their aqueous dispersions

Self-propagating high-temperature synthesis of (Ho1-xLax)2O3 nanopowders for magneto-optical ceramics

“…A release of NO 2 was not detected upon heating. The presence of water and carbon dioxide in the nanopowder is easily explained since they are not only the main products of the SHS reaction but can also be quickly adsorbed from the air due to the developed surface of the nanopowder [37, 38]. The presence of nitrogen oxides in the powder is due to the SHS process in an excess of the oxidizing agent (holmium nitrate).…”

Highly transparent Yb-doped (LaxY1−x)2O3 ceramics prepared through colloidal methods of nanoparticles compaction

“…2, curve 2). The carbon content was found to depend linearly on the specific surface of the nanopowder and be just as in [39] approximately 0.1 mg of carbon per 1 m 2 of the powder surface. The nanopowder "as made" with S BET = 60 m 2 /g had Fig.…”

“…However, the origin of nitrates is not as obvious, since NO 2 molecules are not be found in the ambient air. In previous work, the authors believed the NO 2 to be formed as a result of a reaction between N 2 and O 2 , when air is mixed with plasma of evaporated material [38,39]. Although nitrogen and oxygen do not react at room temperature, the reaction is possible within a hot zone of vapors, where the temperature is about 4300 • C. The NO 2 molecules are adsorbed by the metal oxide nanoparticles condensed from the vapors and form nitrates on the nanoparticles surface.…”

The Electrophoretic Deposition of Nanopowders Based on Yttrium Oxide for Bulk Ceramics Fabrication

“…where: µ-mass of acetylacetone per unit surface of the nanopowder, mg/m 2 , S BET -specific surface of the nanopowder, m 2 /g; m np -weight of the nanoparticles, g; m Hacac -weight of the acetylacetone, mg In accordance of a series of previous experiments on the stabilization of nanoparticles in suspensions [32,33], a value of µ about 1 mg/m 2 was chosen. Suspensions where acetylacetone was used are listed in Table 1.…”