Effects of particle shape and chemical composition on the electron impact charging properties of submicron inorganic particles

被引:27
作者
Ziemann, PJ
Kittelson, DB
McMurry, PH
机构
[1] Particle Technology Laboratory, Department of Mechanical Engineering, University of Minnesota, Minneapolis
关键词
D O I
10.1016/0021-8502(96)00010-9
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The electron impact charging properties of submicron (similar to 0.04-0.25 pm diameter) particles of inorganic salts, and metal and semiconductor oxides were investigated using a particle beam apparatus. The results indicate that the particle saturation charge is approximately a linear function of diameter, and is relatively insensitive to particle shape and chemical composition. A linear least-squares fit to all our data on inorganic and organic particles (14 different compounds) provides a simple equation that can be used to calculate saturation charge to within similar to 15% for these broad classes of materials. This result is important for the application of a new particle beam mass spectrometric technique we have developed for sizing submicron particles sampled from low-pressure environments. The saturation charging curves can be explained by using the results of a series of measurements on KCl particles to extend a charging model developed earlier for organic particles. Copyright (C) 1996 Elsevier Science Ltd.
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页码:587 / &
页数:19
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