Abstract
The paper examines the structure of porous Fe3O4 + NaCl condensates and analyzes the phase and chemical composition and sizes of Fe3O4 nanoparticles produced by electron beam evaporation and vacuum condensation. It is shown that Fe3O4 nanoparticles in a porous salt matrix are highly adsorptive to air oxygen. The adsorptivity decreases when iron concentration in the condensate increases. Thermogravimetric analysis is used to study the kinetics of variation in the weight of porous NaCl and Fe3O4 + NaCl condensates during heating to 650°C and cooling 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 an aqueous solution of surface active agents. The physical method for obtaining nanoparticles in electron beam vacuum setups is highly efficient and competitive with previous methods for synthesis of nanoparticles.
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