Autori: LÁSZLÓ ALMÁSY , DORINA CREANGA, CLAUDIA NADEJDE, LÁSZLÓ ROSTA, EKATERINA POMJAKUSHINA, MANUELA URSACHE-OPRISAN
Editorial: doi:10.2298/JSC140313053A , J. Serb. Chem. Soc., 2014.
Various uses of ferrofluids for technical applications continuously
raise the interest in improvement and optimization of preparation methods.
This paper deals with preparation of finely granulated magnetite particles
coated with oleic acid in hydrocarbon suspensions following either chemical
co-precipitation from iron salt precursors or wet milling of micron size
magnetite powder with the goal to compare the benefits and disadvantages of each method. Microstructural measurements showed that both methods gave similar magnetite particle size of 10-15 nm.Higher saturation magnetization
was achieved for the wet-milled magnetite suspension compared to relatively rapid co-precipitation synthesis. Different efficacies of ferrophase incorporation into kerosene could be related to the different mechanisms of oleic acid bonding to nanoparticle surface. The comparative data show that wet milling represents a practicable alternative to the traditional co-precipitation since despite of longer processing time, chemicals impact on environment can be avoided as well as the remnant water in the final product.
Cuvinte cheie: Magnetite nanoparticles,kerosene suspensions, X-ray diffraction, TEM, magnetometry, IR spectra