期刊
AEROSOL SCIENCE AND TECHNOLOGY
卷 44, 期 4, 页码 308-315出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/02786821003636763
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资金
- University of Helsinki
- Austrian Science Fund [P20837-N20]
In this work we present the latest design of the Vienna type Differential Mobility Analyzer (DMA). The so-called UDMA is specially designed for high-resolution mobility measurements for the particle size range between 1 and 5 nm and has been optimized to be combined with a mass spectrometer to provide a well-defined mobility fraction of molecular clusters. As the UDMA is designed for this narrow size range it features high-resolution mobility measurements already at flow rates of approximately 700 L/min, marked as medium flow conditions. This readily allows operating the UDMA in a recirculating sheath air flow system with gas cleaning filters, as the control over the purity of the sheath air is crucial for operating the UDMA inline with a mass spectrometer or other carrier gas sensible devices. The performance of the newly developed UDMA was tested by the analysis of well-defined molecular clusters produced by an electrospray source and compared with one of the state-of-the-art high resolution DMAs also known as Attoui DMA. For the UDMA, a relative FWHH of the transfer function of 2.5% in mobility-size was found for the monomer clusters of Tetraheptylammoniumbromide (THAB) at 1.44 nm mobility equivalent diameter.
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