电迁移率与温度、湿度和烷基铵离子结构的关系

IF 3.9 3区 环境科学与生态学 Q2 ENGINEERING, CHEMICAL Journal of Aerosol Science Pub Date : 2024-02-27 DOI:10.1016/j.jaerosci.2024.106353
Xuemeng Chen , Juha Kangasluoma , Jakub Kubečka , Ivo Neefjes , Hanna Vehkamäki , Markku Kulmala , Amirreza Tootchi , Farah Mubas Sirah , Leyan Hua , Carlos Larriba-Andaluz , Heikki Junninen
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引用次数: 0

摘要

了解温度(T)和相对湿度(RH)以及结构和极化对离子迁移率的影响有助于迁移率数据和质量数据的比较和解释。我们在不同的温度(14 °C、24 °C、34 °C、41 °C)和相对湿度(0 %、20 %、40 %)条件下使用两种不同的装置(均为平面差分迁移率分析仪与飞行时间质谱仪联用)测量了空气中的烷基铵离子,结果非常吻合。迁移率随着水蒸气含量的增加而增加,随着水蒸气含量的减少而减少。在按结构分离测量迁移率时,观察到了明显的质量依赖性。在干燥条件下,测得的迁移率与理论计算结果存在较大偏差,这可能是由于单体离子通过聚类(或反应)形成加合物所致。这种现象似乎不可避免地与大气压下的轻离子有关,值得进一步探讨,并在将测量结果与计算结果进行比较时加以注意。甲醇和氧(偶尔是氮或烷基链延伸)都可能是加合物的候选物。在球形假设下,我们使用修正的 Mason-Schamp 近似法将测得的迁移率与迁移率等效直径联系起来。根据我们的测量数据得出的阻力增强因子和有效气体分子碰撞直径与文献值相当。我们的数据还揭示了极化参数的非线性依赖性。对于具有相同烷基的伯烷基、仲烷基和叔烷基铵离子,我们使用线性模型对极化、和进行了参数化,并对离子结构、、和 RH 进行了参数化。我们的模型参数预测的迁移率与测量数据的偏差不超过 ±10%。对于烷基结构不完全相同的烷基铵离子,该模型也具有令人满意的预测能力。
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On the dependence of electrical mobility on temperature, humidity and structure of alkylammonium ions

Insights into the effect of temperature (T) and relative humidity (RH) as well as structure and polarisation on ion mobility help the comparison and interpretation of mobility and mass-based data. We measured alkylammonium ions in air under different T (14 °C, 24 °C, 34 °C and 41 °C) and RH (0 %, 20 %, 40 %) conditions using two individual setups (in both cases a planar differential mobility analyser coupled with a time-of-flight mass spectrometer) and the results are in excellent agreement. Mobility increases with rising T and decreases with water vapour loading. When separating the measurement mobility by structures, clear mass dependence was observed. The measured mobilities exhibited large deviations from theoretically calculated results in dry conditions, which are possibly caused by adduct formation on the monomer ions via clustering (or reactions). This phenomenon seems to be unavoidably associated with light ions under atmospheric pressures, which is worth further exploration and bearing in mind when comparing measurements to calculations. Both methanol and oxygen (occasionally nitrogen or alkyl chain elongation) are possible candidates of the adduct. Under spherical assumption, we used the modified Mason–Schamp's approximation to link the measured mobility to the mobility equivalent diameter. The drag enhancement factor ξ and the effective gas-molecule collision diameter dg derived from our measurement data are comparable to literature values. Our data also exposed a non-linear dependence on the polarisation parameter ε*. Polarisation, ξ and dg were parameterised using linear models against ion structures, T, and RH for primary, secondary and tertiary alkylammonium ions with identical alkyl groups. Our model parametrisations predict mobilities within ±10 % deviation from the measured data. The model also has satisfying predicting power for alkylammonium ions with unidentical alkyl structures.

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来源期刊
Journal of Aerosol Science
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.
期刊最新文献
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