title: Disperse fine equiaxed alpha alumina nanoparticles with narrow size distribution synthesised by selective corrosion and coagulation separation.
abstract: Disperse fine equiaxed α-Al2O3 nanoparticles with narrow size distribution are important materials in nanotechnology and nanomaterials, but syntheses of disperse fine equiaxed α-Al2O3 nanoparticles usually result in fine γ-Al2O3 nanoparticles or large α-Al2O3 nanoparticles larger than 15 nm. α-Al2O3 has a higher surface energy than γ-Al2O3 and becomes thermodynamically not stable with respect to γ-Al2O3 at specific surface areas larger than 100 m(2)/g (at sizes smaller than 15 nm for spherical particles) at room temperature. So disperse fine equiaxed α-Al2O3 nanoparticles smaller than 15 nm with narrow size distribution are extremely difficult to synthesise. Here we show the successful synthesis of disperse fine equiaxed α-Al2O3 nanoparticles with average sizes below 10 nm and narrow size distribution by selective corrosion and refined fractionated coagulation separation. An almost fully dense nanocrystalline α-Al2O3 ceramic with a relative density of 99.5% and an average grain size of 60 nm can be sintered from disperse fine equiaxed α-Al2O3 nanoparticles with narrow size distribution.
authors.affiliation: Institute of Materials Science &Engineering, Lanzhou University, Lanzhou 730000, China.
authors.forename: Sanxu
authors.initials: S
authors.lastname: Pu
authors.affiliation: Institute of Materials Science &Engineering, Lanzhou University, Lanzhou 730000, China.
authors.forename: Lu
authors.initials: L
authors.lastname: Li
authors.affiliation: Institute of Materials Science &Engineering, Lanzhou University, Lanzhou 730000, China.
authors.forename: Ji
authors.initials: J
authors.lastname: Ma
authors.affiliation: Institute of Materials Science &Engineering, Lanzhou University, Lanzhou 730000, China.
authors.forename: Fuliang
authors.initials: F
authors.lastname: Lu
authors.affiliation: Institute of Materials Science &Engineering, Lanzhou University, Lanzhou 730000, China.
authors.forename: Jiangong
authors.initials: J
authors.lastname: Li