Preparation of Y₂O₃ Particles by Flame Spray Pyrolysis with Emulsion

Abstract

Y2O3 particles of various sizes have been prepared by flame spray pyrolysis using water-in-oil emulsion precursor solutions. We found that by varying the emulsion droplet size, the particle size of the prepared Y2O3 powder can easily be varied from 30 to 700 nm. In conventional spray pyrolysis, each droplet generated by the atomizer is converted to one particle. Thus, particle size can only be controlled by varying the concentration of the precursor, which results in a decrease in the generation rate. As in conventional spray pyrolysis, the flame spray pyrolysis of the emulsions was found to result in the conversion of one emulsion droplet to one particle. Control of particle size was achieved by varying the emulsion droplet size, which results in no decrease in the particle generation rate.

Design of particles by spray pyrolysis and recent progress in its application

“…Example Morphology Dense [34][35][36], Hollow [37], Nano, Meso or micro porous [38], Spherical [39], Rod-like [40] Form of product Particle [41], Thin film [42], Coating (surface modification) [43] Type of product Oxide of single & multi component [13,14], Non-oxide such as phosphide, boride, sulfide, nitride [44], Metal [45] [70], Ru-Ni core-shell [71], Glass-coated silver [43] Small particle dispersed on a support Pd/Al 2 O 3 [72] Hollow particle Hollow silica [37] Porous particle TiN [44] Mesoporous particle SiO 2 [38] *DCCA: drying control chemical additive November, 2010…”

“…Water-in-oil emulsion precursor solution was sprayed into the flame, and size-controlled particles in the range of 30 to 700 nm were produced [13]. Iron phosphide particles were also demonstrated to be produced by spray pyrolysis [137].…”

“…Fig. 7 is a schematic diagram of particle generation mechanism by emulsion-assisted flame spray pyrolysis [13]. Emulsion precursor (waterin-oil) is sprayed into the flame and particles are disintegrated to nanometer size because of oil burning.…”

“…Application of spray pyrolysis is not limited to powder production. It covers a wide range of non-conventional applications such as preparation of field effect transistor [138,139], solid coating of refractive materials [13] and carbon nanotubes [124,125].…”

“…A schematic diagram of the emulsion-assisted flame spray pyrolysis[13]. Schematic diagram of organic assisted-spray pyrolysis[59].Fig.…”