Interpretation of Volatility Tandem Differential Mobility Analyzer (V-TDMA) data for accurate vapor pressure and enthalpy measurement: Operational considerations, multiple charging, and introduction to a new analysis program (TAO)
Interpretation of Volatility Tandem Differential Mobility Analyzer (V-TDMA) data for accurate vapor pressure and enthalpy measurement: Operational considerations, multiple charging, and introduction to a new analysis program (TAO)
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解释挥发性串联微分迁移率分析仪 (V-TDMA) 数据，以实现准确的蒸气压和焓测量：操作注意事项、多次充电以及新分析程序 (TAO) 介绍
DOI：
10.1080/02786826.2019.1709617
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发表时间：
2020
影响因子：
5.2
通讯作者：
Williams, Brent J.
中科院分区：
文献类型：
--
作者：
Oxford, Christopher R.;Dang, Audrey J.;Rapp, Charles M.;Williams, Brent J.
挥发性串联微分迁移率分析仪 (V-TDMA) 中纯气溶胶的显着蒸发会产生两个凝聚粒子计数器 (CPC) 响应峰。针对观察到的峰提出了两种假设：存在两相或单电荷实验尺寸分布与电荷大于 1 的其余实验尺寸分布分离（电荷分离）。为了探索这一观察结果，我们将纯左旋葡聚糖气溶胶雾化并蒸发气溶胶，直到形成两个峰。我们使用额外的分类器和中和器从两个峰中选择颗粒并评估颗粒上的电荷数量。较小直径的峰包含单带电粒子，较大直径的峰包含剩余电荷。电荷分离假说单独解释了双峰观察。我们使用了名为 TAO 的新 V-TDMA 模型，并表明电荷分离也应该发生在其他纯组分中。然后使用 TAO 模型显示不同 DMA 传递函数、不同入口尺寸分布和不同烘箱停留时间分布 (RTD) 对 CPC 响应的影响。当不直接测量 RTD 或使用宽 RTD 时，可能会出现较大误差。我们建议使用窄 RTD 的窄传输函数来检测电荷分离。当单电荷 CPC 响应被隔离时（两个峰响应中较小直径的峰），假设使用气相扩散率、表面能、颗粒密度等的准确值，可以恢复蒸汽压的准确估计。版权所有 © 2020 美国气溶胶研究协会
Significant evaporation of pure aerosols in a Volatility Tandem Differential Mobility Analyzer (V-TDMA) creates two Condensation Particle Counter (CPC) response peaks. Two hypotheses for the observed peaks have been proposed: the existence of two phases or the separation of the singly charged experimental size distribution from the remaining experimental size distributions with charges greater than 1 (charge separation). To explore this observation, we atomized pure levoglucosan aerosol and evaporated the aerosol until two peaks formed. We used an additional classifier and neutralizer to select particles from each of the two peaks and assessed the number of charges on the particles. The smaller diameter peak contained singly charged particles, and the larger diameter peak contained the remaining charges. The charge separation hypothesis alone accounts for the two-peak observations. We used a new V-TDMA model named TAO and show that charge separation should occur in other pure components as well. The TAO model was then used to display the impact of different DMA transfer functions, different inlet size distributions, and different oven residence time distributions (RTDs) on the CPC response. Large errors are possible when direct measurement of the RTD is not performed or when wide RTDs are used. We recommend use of narrow transfer functions with narrow RTDs to detect charge separation. When the singly charged CPC response is isolated (smaller diameter peak in the two peak response), accurate estimations of vapor pressure can be recovered, assuming accurate values for gas phase diffusivity, surface energy, particle density, etc. are used.Copyright © 2020 American Association for Aerosol Research
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影响因子：
5.2
作者：
Christopher R. Oxford;Charles M. Rapp;Yang Wang-;Purushottam Kumar;Daniel Watson;J. Portelli;Eric A. Sussman;Steven Dhawan;Jingkun Jiang;B. Williams
通讯作者：
Christopher R. Oxford;Charles M. Rapp;Yang Wang-;Purushottam Kumar;Daniel Watson;J. Portelli;Eric A. Sussman;Steven Dhawan;Jingkun Jiang;B. Williams
影响因子：
5.2
作者：
RADER, DJ;MCMURRY, PH;SMITH, S
通讯作者：
SMITH, S
DOI：
10.6028/jres.110.005
发表时间：
2005-01
影响因子：
1.5
作者：
Kim JH;Mulholland GW;Kukuck SR;Pui DY
通讯作者：
Pui DY
影响因子：
5.2
作者：
Petters, Markus D.
通讯作者：
Petters, Markus D.
C14-C18 一元羧酸和 C5 和 C6 二元羧酸的蒸气压和表面自由能
影响因子：
11.4
作者：
Ye Tao;P. Mcmurry
通讯作者：
P. Mcmurry