Small-Ion and Nano-Aerosol Production During Candle Burning: Size Distribution and Concentration Profile with Time
Small-Ion and Nano-Aerosol Production During Candle Burning: Size Distribution and Concentration Profile with Time
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DOI：
10.1080/02786820701225812
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发表时间：
2007-04
影响因子：
5.2
通讯作者：
M. Wright;A. Fews;P. Keitch;D. Henshaw
中科院分区：
文献类型：
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作者：
M. Wright;A. Fews;P. Keitch;D. Henshaw
利用自行研制的吸气式冷凝离子迁移谱仪（ACIMS）和序贯迁移粒度分析仪（SMPS+C）系统，研究了石蜡茶光蜡烛燃烧过程中产生的0.4 nm ~ 1.1 μm小离子和气溶胶的特性。在直径10-30 nm和100-300 nm处观察到数浓度峰，与“正常”和“炭黑”燃烧模式一致。此外，在2.5-9 nm的尺寸范围内观察到一个较小的模式，解释为烟尘前体物种。当将风扇放置在燃烧的蜡烛后面时，在1.1-2.0 nm的尺寸处观察到“修饰的小离子”信号。在没有风扇的情况下或当使用灯烟囱时，没有观察到这一点。在燃烧过程中，气溶胶浓度升高，小离子计数低。然而，在火焰熄灭后，这种趋势被逆转，小离子的数量增加到高于燃烧前观察到的水平，并保持几个小时。
The characteristics of small-ions and aerosols in the diameter range 0.4 nm to 1.1 μm, produced during burning of paraffin wax tea-light candles, were investigated using a custom-built aspiration condenser ion mobility spectrometer (ACIMS) and a sequential mobility particle sizer and counter (SMPS+C) system. Peaks in the number concentration were observed at diameters 10–30 nm and 100–300 nm, consistent with “normal” and “sooting” burn modes. In addition, a smaller mode in the size range 2.5–9 nm was observed, interpreted as a soot-precursor species. When a fan was placed behind the burning candle a “modified small-ion” signal was seen at sizes 1.1–2.0 nm. This was not observed without the fan present or when a lamp chimney was used. During burning, aerosol concentration was elevated and small-ion counts were low. However after extinction of the flame, this trend was reversed and the number of small-ions increased to levels higher than those observed prior to burning, remaining so for several hours.