Conferences

Control of the Composition and Structure of Fe–O Nanoparticles during Fe3O4 Electron Beam Evaporation

B.A.Movchan,
 
Yu.A.Kurapov,
 
G.G.Didikin,
 
S.G.Litvin,
 
S.M.Romanenko
 

Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2011, #03/04
http://www.materials.kiev.ua/article/1389

Abstract

The paper examines the structure of porous Fe3O4 + NaCl condensates and analyzes the phase and chemical composition and sizes of Fe3O4 nanoparticles pro-duced by electron beam evaporation and condensation in vacuum. The high adsorptivity of porous Fe3O4 salt matrix relative to air oxygen is shown. It decreases when iron concentration in the condensate increases. Thermogravimetric analysis is used to study the kinetics of relative change in the weight of porous NaCl and Fe3O4 + NaCl condensates when heated to 650°C and cooled in air. The results are considered in terms of physical and chemical adsorption. Stabilized colloidal systems of magnetite nanoparticles are obtained. Photon correlation spectroscopy is used to determine their quantitative size distribution in a water solution with surface active substances. The physical method for obtaining nanoparticles in electron beam vacuum units is highly efficient and competitive with previous methods for synthesis of nanoparticles.


ADSORPTION, ELECTRON-BEAM EVAPORATION, MAGNETITE, NANOPARTICLES, OXYGEN