Ultrasonic Spray Pyrolysis for Synthesis of Spherical Zirconia Particles |
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| Authors: | Y L Song S C Tsai C Y Chen T K Tseng C S Tsai J W Chen Y D Yao |
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| Affiliation: | Institute for Applied Science and Engineering Research, Academia Sinica, Taipei, 115 Taiwan;Department of Chemical Engineering, California State University, Long Beach, California 90840;Department of Electrical Engineering and Computer Science, University of California, Irvine, California 92697;Department of Physics, National Taiwan University, Taipei, 106 Taiwan;Insititute of Physics, Academia Sinica, Taipei, 115 Taiwan |
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| Abstract: | This paper presents new findings on ultrasonic spray pyrolysis of zirconium hydroxyl acetate precursor drops whose sizes were precisely measured using laser light diffraction technique. Precursor concentration plays a predominant role in determination of product particle size. At 0.01 wt% precursor concentration, conventional spray pyrolysis at 750°C using precursor drops 5–8 μm in diameter, generated by an ultrasonic nebulizer at 2.66 MHz, yielded uniform spherical yttria-stabilized zirconia (YSZ) particles 73 nm in diameter measured by scanning electron microscopy. The YSZ particle diameters were much smaller than those predicted by the one-particle-per-drop mechanism. Under similar reaction conditions, the high-throughput ultrasound-modulated two-fluid (UMTF) spray pyrolysis of larger precursor drops (28-μm peak diameter) also yielded spherical dense particles; they were significantly smaller in size than those produced by the low-throughput conventional ultrasonic spray pyrolysis of smaller drops (6.8-μm peak diameter). |
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| Keywords: | ultrasonics spray pyrolysis zirconia |
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