Growth and structure analysis of tungsten oxide nanorods using environmental transmission electron microscopy
The WO3 nanorods were fabricated in environmental transmission electron microscopy (ETEM) by simply heating it in oxygen atmosphere. Altough, WO3 nanorod showed high crystalline, but the stacking fault existed in nanorod. Furthermore, the nanorod was grown on tungsten wire through slit of oxide layer on it.
The Growth Mechanism of a-Fe 2O 3 Ellipsoidal Particles in Solution
Abstract The mechanism of formation of ellipsoidal hematite (α-Fe 2 O 3 ) particles, obtained by homogeneous precipitation from ferric salt solutions under different experimental conditions, is reported. Monocrystalline ellipsoidal particles having an axial ratio of 6, precipitated by aging FeCl 3 solutions in the presence of small amounts of phosphate anions, are formed by an ordered aggregation of smaller ellipsoids. The nature of the forces involved in this process and the role played by phosphate anions are discussed. Ellipsoidal hematite particles (axial ratio 1.65) obtained by aging Fe(NO 3 ) 3 acidic (HNO 3 ) solutions were found to contain a certain amount (≈8%) of goethite (α-FeOOH) in the particle core. A formation mechanism involving the heterogeneous nucleation of hematite on initially precipitated goethite cores is suggested.
Finite Difference Modeling on the Temperature Field of Substrate in Friction Surfacing
Friction surfacing is an advanced process of great potential, especially in the field of repair and reclamation of worn and damaged components. As a kind of thermal processing technology, the temperature profile and changes of the substrate in friction surfacing are important factors to get coatings of high quality. In this paper, the temperature field of the substrate during the process is simulated by finite difference method. The results are consistent with experiments, reappearing the temperature change of the substrate during friction surfacing, allowing further study on figuration and quality of coatings.