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Solution combustion synthesis of metal nanopowders: Copper and copper/nickel alloys
Author(s) -
Kumar A.,
Wolf E. E.,
Mukasyan A. S.
Publication year - 2011
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.12537
Subject(s) - copper , alloy , nickel , intermetallic , materials science , oxide , combustion , metal , copper oxide , phase (matter) , metallurgy , inorganic chemistry , hydrogen , chemical engineering , chemistry , organic chemistry , engineering
Abstract Based on a general methodology for the preparation of metal–nanopowders by solution combustion synthesis (SCS), the reaction pathways for SCS of pure copper and copper–nickel alloy nanopowders are investigated. It is confirmed that the necessary condition for SCS of metals in a metal‐nitrate oxidizer–glycine system is the property of the oxidizer to decompose with formation of HNO 3 species. In this case, for compositions with excess of glycine, a hydrogen reducing atmosphere develops in the reaction front, leading to the formation of reduced metals. The proposed reaction pathways are supported by X‐ray diffraction analysis of the quenched samples and DTA–TGA studies of the Cu(NO 3 ) 2 ·6H 2 O–glycine and Ni(NO 3 ) 2 ·6H 2 O/Cu(NO 3 ) 2 ·6H 2 O–glycine systems. The results show that the formation of Cu 2 O and CuO oxide phases takes place at early stages in the reaction front followed by their reduction to pure Cu phase in the postcombustion zones. However, in a Cu–Ni alloy, a fraction of intermetallic Cu–Ni phase appeared directly in the combustion front, whereas the rest of the oxygen‐free alloy formed through reduction of oxide phases. © 2011 American Institute of Chemical Engineers AIChE J, 2011