期刊
AEROSOL SCIENCE AND TECHNOLOGY
卷 50, 期 3, 页码 222-229出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/02786826.2016.1142065
关键词
Jian Wang
类别
资金
- European Research Council (ATMNUCLE) [227463]
- Academy of Finland (Center of Excellence Program) [1118615, 139656]
- Nordic Center for Excellence (CRAICC)
- European Commission [262254, 654109, 265148]
- Office of Science (BER)
- US Department of Energy (The Biogenic Aerosols - Effects of Clouds and Climate, BAECC)
Aerosol instrument characterization and verification for nanometer-sized particles requires well-established generation and classification instruments. A precise size selection of sub-3-nm charged aerosol particles requires a differential mobility analyzer (DMA), specially designed for the sub-3-nm size range. In this study, a Herrmann-type high-resolution DMA developed at Yale University was characterized in various operation conditions. A relation between sheath flow rate and tetraheptylammonium ion (C28H60N+, THA(+), 1.47 nm, mobility equivalent diameter) was established. The maximum particle size that the DMA was able to classify was 2.9 nm with the highest sheath flow rate of 1427 liters per minute (Lpm), and 6.5 nm with the lowest stable sheath flow rate of 215 Lpm, restricted by the maximum and minimum flow rates provided by our blower. Resolution and transmission of DMA are reported for tetrapropylammonium (C12H28N+, TPA(+), 1.16 nm), THA(+), and THA(2)Br(+) (1.78 nm) ions measured with two different central electrodes and five different sheath flow rates. The transmission varied between 0.01 and 0.22, and the resolution varied between 10.8 and 51.9, depending on the operation conditions. Copyright (c) 2016 American Association for Aerosol Research
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