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News number: 8809221931

19:16 | 2009-12-13

Science

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Iranian Scientists Find New Method for Production of Nanocomposites

TEHRAN (FNA)- The researchers at Ferdowsi University of Mashhad, Iran, introduced a new method for direct synthesis of nanocomposites from metallic oxides.



Mechanochemical synthesis based on materials production using chemical reactions is one of the mechanical alloying applications done by the energy resulted from milling which reveals an appropriate method for the synthesis of different nanocomposites and organic, inorganic, oxides and intermetallic compounds.

"The main purpose of the present study was to prove the possibility of activation of endothermic carbothermic reduction reaction of metallic oxides in the presence of exothermic aluminothermic reduction reaction and consequent production of nanostructured brass-alumina," M.A. Mara'shi, one of the Iranian scientists explained to the news service of INIC.

"In this research, the effect of aluminothermic reduction reactions on facilitating and accelerating carbothermic reduction reactions for the production of nanostructured brass-alumina by mechanochemical method has been investigated," she added.

For this purpose, she and her colleagues utilized carbon and aluminum elements as copper and zinc oxides reductive agents. Then they drew adiabatic temperature changes of overall reduction reaction versus initial amounts of aluminum and carbon by thermodynamic calculations. Four adiabatic temperatures of 298, 1300, 1800, and 2300 K were chosen for milling tests.

The milled specimens were undergone XRD tests at different times. TEM images were also applied to check if the resulting composites were nanostructured.

Tests results implied that reactions activate spontaneously in the case of compounds having adiabatic temperature equal to or greater than 1800 K and carbothermic reduction occured simultaneously with aluminothermic reduction so that brass-alumina nanostructured composite were synthesized after three hours of milling.