電流計内蔵型クラスタDMAの性能評価とイオンの電気移動度測定への応用 Performance Evaluation of Cluster-DMA with Integrated Electrometer and Its Application to Ion Mobility Measurements
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In order to measure mobility distribution of nanometer-sized clusters and ions, the Cluster-Differential Mobility Analyzer with the integrated electrometer (CDMA-IE) has been manufactured following the design by Rosell-Llompart <I>et al.</I> (<I>J. Aerosol Sci.</I>, <B>27</B>, 695-719 (1996)). To evaluate the flow pattern of aerosol and sheath air in cylindrical annulus of this CDMA-IE, we employed the flow visualization technique developed by Otani <I>et al.</I> (<I>J. Chem. Eng. Jpn.</I>, <B>31</B>, 1065-1069 (1997)). The visualization results were compared with the calculation results using a fully developed laminar flow and mobility measurement results by means of the Tandem DMA method, and the necessary conditions under which the aerosol and sheath air flow ideally inside the DMA without any turbulence and mixing were clarified. After changing the width of aerosol inlet and properties of the upper filter respectively, we finally determined the detail of the CDMA-IE. Using the well confirmed CDMA-IE, we measured the size and concentration of water cluster ions generated by various methods, α -ray radiolysis, corona discharge, UV/photoelectron method and the Lennard's effect.
- Earozoru Kenkyu
Earozoru Kenkyu 13(2), 83-93, 1998-06-20
Japan Association of Aerosol Science and Technology