A high performance differential mobility analyzer for the masses

IF 3.9 3区环境科学与生态学 Q2 ENGINEERING, CHEMICAL

Journal of Aerosol Science Pub Date : 2024-12-30 DOI:10.1016/j.jaerosci.2024.106522

Juan Fernandez de la Mora , Jerzy Kozlovski

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Abstract

A hand-held Differential Mobility Analyzer (DMA) weighting 4 kg is developed to operate laminarly at many hundreds of L/min, while covering at unusually high resolution the 1–200 nm size range. Coupled with a small and efficient portable vacuum cleaner pump requiring no cooling, a resolving power of 10 or more is obtained at mobility diameters above 1.4 nm. The resolving power at 200 nm is between 40 and 60. Certain design compromises have been made to enable the wide adoption of this instrument in conventional aerosol measurements, making it comparable to broadly used contemporary commercial DMAs in portability, complexity, and cost. Yet, the high flow rate capability provides drastic advantages in resolution, sensitivity and size range over more conventional DMAs. This DMA is nevertheless inferior in resolution to more specialized instruments developed for studies of either nanoparticles or viruses. The inner electrode is a 1° half-angle cone accelerating mildly the flow. Critical dimensions in mm are: outer radius R₂ = 19.58; inner radius at the outlet slit R₁ = 14.34; axial distance between slits L = 85.94.

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高性能差分迁移率分析仪

一种重达4公斤的手持式差分迁移率分析仪（DMA）被开发出来，以数百升/分钟的速度层流运行，同时以异常高的分辨率覆盖1-200纳米的尺寸范围。再加上一个小而高效的便携式真空吸尘器泵不需要冷却，10或更多的分辨能力，在流动性直径高于1.4纳米获得。在200nm处的分辨能力在40 ~ 60之间。为了使该仪器在传统气溶胶测量中得到广泛采用，在便携性、复杂性和成本方面与广泛使用的当代商业dma相媲美，已经做出了某些设计妥协。然而，与传统的dma相比，高流量能力在分辨率、灵敏度和尺寸范围方面提供了巨大的优势。然而，这种DMA在分辨率上不如为研究纳米颗粒或病毒而开发的更专门的仪器。内电极为1°半角锥，可温和加速流动。以mm为单位的临界尺寸为：外半径R2 = 19.58；出口狭缝内半径R1 = 14.34；缝间轴向距离L = 85.94。

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来源期刊

Journal of Aerosol Science 环境科学-工程：化工

CiteScore

8.80

自引率

8.90%

发文量

127

审稿时长

35 days

期刊介绍： Founded in 1970, the Journal of Aerosol Science considers itself the prime vehicle for the publication of original work as well as reviews related to fundamental and applied aerosol research, as well as aerosol instrumentation. Its content is directed at scientists working in engineering disciplines, as well as physics, chemistry, and environmental sciences. The editors welcome submissions of papers describing recent experimental, numerical, and theoretical research related to the following topics: 1. Fundamental Aerosol Science. 2. Applied Aerosol Science. 3. Instrumentation & Measurement Methods.