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Received May 10, 2006
Accepted July 3, 2007
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Reductive crystallization of each metal in composite particles spray-pyrolyzed from silver/nickel mixed nitrates
Department of Chemical Engineering, Chung Ang University, 221, Huksuk-dong, Dongjak-gu, Seoul 156-756, Korea
sgkim@cau.ac.kr
Korean Journal of Chemical Engineering, March 2008, 25(2), 359-363(5), 10.1007/s11814-008-0059-5
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Abstract
Composite particles prepared by spray pyrolysis of aqueous solution of AgNO3 and Ni(NO3)2·6H2O with 10 vol%H2-N2 were characterized and compared with the particles similarly prepared from their pure nitrates. The composite particles were composed of metallic silver, nickel oxide or metallic nickel, depending on the condition, with no trace of alloy. The existence of nickel ions dispersed throughout the particles did not affect the rate of reduction to the highly reducible silver but retarded its subsequent crystal growth. On the other hand, both the reduction to nickel and its crystal growth were all retarded due to the existence of the more reducible silver ions. In addition to these, the incompatibility also increased the size of the composite particles from the corresponding single component particles and kept it almost constant with respect to the preparation temperature.
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References
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Che SL, Takada K, Takashima K, Sakurai O, Shinozaki K, Mizutani N, J. Mater. Sci., 34(6), 1313 (1999)
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Liu QX, Wang CX, Zhang W, Wang GW, Chem. Phys. Lett., 382(1-2), 1 (2003)
Yang SY, Kim SG, Powder Technol., 146(3), 185 (2004)
Kim KN, Kim SG, Powder Technol., 145(3), 155 (2004)
Kang DJ, Preparation of spherical particles by droplet-particle conversion, Ph.D. Dissertation, Chung Ang University (2003)
Ichinose N, Osaki Y, Kashu S, Introduction to ultrafine particle technology, (in Jap), Ohm Co, Tokyo (1988)
