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Received July 3, 2007
Accepted January 7, 2008
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Effect of gas environment on properties of particles prepared by spray pyrolysis of metal 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, July 2008, 25(4), 885-891(7), 10.1007/s11814-008-0146-7
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Abstract
Particles in different states of oxidation were prepared by spray pyrolyses of aqueous solutions of silver and copper nitrates under different gas environments: air, nitrogen or mixture gas of 10 vol%H2-N2, respectively. Silver nitrate was converted to phase-pure silver at temperatures below 500 ℃ whose densification and crystallization were completed around 500 ℃, irrespective of the gas environment. On the other hand, phase-pure copper(II) oxide was formed from copper nitrate up to 1,000 ℃ with air, but below 800 ℃ with nitrogen, above which copper(I) oxide was produced. Phase-pure copper particles were obtained with the mixture gas at temperatures above 400 ℃. Copper(I) oxide was sintered and crystallized more easily than copper(II) oxide. The rates of the metallization, sintering and crystallization of copper were between those of silver and nickel.
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Stovic S, Ilic I, Uskokovic D, Mater. Lett., 24, 369 (1995)
Che SL, Takada K, Takashima K, Sakurai O, Shinozaki K, Mizutani N, J. Mater. Sci., 34(6), 1313 (1999)
Kang DJ, Kim SG, Kim HS, J. Mater. Sci., 39(18), 5719 (2004)
Kim KN, Kim SG, Powder Technol., 145(3), 155 (2004)
Pluym TC, Powell QH, Gurav AS, Ward TL, Kodas TT, Wang LM, Glickman HD, J. Aerosol Sci., 24, 383 (1993)
Yang SY, Kim SG, Powder Technol., 146(3), 185 (2004)
Lenggoro IW, Itoh Y, Iida N, Okuyama K, Mater. Res. Bull., 38, 1819 (2003)
Kang DJ, Ph.D. Dissertation, Chung Ang University, Seoul (2003)
Majumdar D, Shefelbine TA, Kodas TT, J. Mater. Res., 11, 2861 (1998)
Ichinose N, Osaki Y, Kashu S, Introduction to Ultrafine Particle Technology (in Jap), Ohm Co, 29 (1988)
