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Heterogeneous nucleation measurements in a sheathed planar diffusive condensation particle counter
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DOI：10.1016/j.jcis.2021.07.049.png)
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Abstract
En 中文
Hypothesis: While the lack of efficient tools yielding controllable uniform saturation ratios (S) has delayed basic experimental heterogeneous nucleation studies, common diffusive condensation particle counters (DCPCs) could fill this gap if their S-variation were minimized by increasing the proportion of sheath gas (sigma) surrounding a central core of purified clusters. Analysis: We measure the activation probability P of Tetraheptylammonium Bromide cluster cations (THA-Br)(n-1)THA(+) in Kanomax's fast CPC while controlling S through the saturator and condenser temperatures (T-s, T-c), varying sigma, and changing the size (n) of purified salt clusters via high resolution mobility selection. Findings: Experimental curves P(T(s,)n) obtained in 1-butanol/air at fixed T-c (13 degrees C) and variable n and T-s (3 < n < 16; 30 < T-s < 40 degrees C) rise sharply versus both n and T-s. Their steepness increases five-fold with increasing sigma to about sigma = 75%, with little effect thereafter. Measurements changing S would yield size distributions of unknown aerosols at fairly high resolution. Comparing P(T(s,)n) data with predictions from capillary theory suggests that basic heterogeneous nucleation measurements can be carried out, but instrument improvements are still needed. (C) 2021 Published by Elsevier Inc.
Keywords:
CPC
High size resolution
Nucleation size
Kelvin size
Purified seed cluster
Heterogeneous nucleation kinetics
Journal
IF:
9.7
Papers:
3.7W
Citations:
14.7W