ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Laboratory Study on Nucleating Properties and Microstructure of AgI Pyrotechnics
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Abstract:
Two formulations (WMCIN001 and WMCIN002) of high efficient AgI pyrotechnics used in weather modification have been obtained after a number of screen tests were carried out in CAMS 1 m3 isothermal cloud chamber. The effectiveness can reach to 1014 g-1 AgI at temperatures of -7℃ and colder for WMCIN001, and it can reach up to 1015 g-1 AgI at -15℃. The foreign pyrotechnic was made according to the formulation of silverspare (USSR). The ice nucleating properties of silverspare and other five formulations of AgI pyrotechnics in the marketplace in 2011 was tested in the same chamber for comparison with the new pyrotechnics. The results show that the nucleating rates are very low for WMCIN001 and WMCIN002, and change less (in 40-55 min) in the temperature range between -7 and -20℃. The aerosol particles produced by WMCIN001 are identified by environmental scanning electron microscope (ESEM) and energy disperse spectroscopy (EDS). The particle sizes are within 0.02-0.60 μm in diameter, and the mean cuberoot diameter is 0.2472 μm. WMCIN001 aerosol has a pronounced bimodal size distribution with particles in the small diameter mode between 0.02-0.10 μm and particles constituting the mode between 0.20-0.55 μm. The relatively large particle size may be one cause for the low nucleating rates.
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