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The 1st International Seminar on Fundamental and Application of Chemical Engineering (c) ISFAChE 2010 November 3-4, 2010, Bali-Indonesia Figure 4: SEM Micrographs of Prepared AgI at Various AgNO3 Concentrations. (a) 0.0 3g/L, (b) 0.05 g/L, (c) 0.10g/L, and (d) 0.20 g/L. Other Operating Variables Kept Constant are: Effects of rotation speed LA=LB=0.5 L/min, [PEG]=5.0g/L, N=4000 rpm The effect of rotation speed was discussed by adjusting the rotation speed of the disk from 500rpm to 4000 rpm as the other operating variables remained constant. The volume particle size distribution of AgI particles are presented in Figure 5. The experimental results showed two modes of the size distribution, implying that small portion of particles agglomerated to form larger particles in this process. When the rotation speed increased, the portion of large particles reduced. In general, high rotation speed favors higher micromixing efficiency, thus, a narrow size distribution can be obtained. Figure 5: Effect of Rotation Speed on the Volume Prticle Size Distribution. Other Operating Variables Kept Constant are: LA=LB=0.5 L/min, [AgNO3]=[KI]=0.2 M, [PEG]=5.0g/L 4. Conclusion Silver iodide nanoparticles were successfully synthesized in a spinning disk reactor using PEG as the protecting agent. The reaction took place at ambient temperature and the reaction time was less than 1 min, which was considerably shorter than the conventional reactive precipitation method using a batch stirred vessel. In this study, the smallest average particle size is around 200 nm, under the following operation conditions: 0.05M for reactants (AgNO3 and KI) concentration, 2.5g/L for PEG concentration, 0.5L/min for flow rate, and 4000 rpm for rotation speed. Acknowledgement(s) The authors express their thanks to the Ministry of Economic Affairs of Taiwan for financial support of this work. (d) E002-5PDF Image | Silver Iodide Nanoparticles Using a Spinning Disk Reactor
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