醇类溶剂对电子烟雾化气溶胶粒径分布的影响

为了解烟油的溶剂组成对电子烟气溶胶粒径分布的影响规律，采用电子低压冲击仪（ELPI）分别测试了乙醇、正丙醇、正丁醇、乙二醇、1，2-丙二醇、1，4-丁二醇、丙三醇、1，2，4-丁三醇、PEG200、PEG400等常见醇类溶剂在相同雾化条件下的烟雾颗粒粒径分布，并在此基础上研究了烟油中1，2-丙二醇和丙三醇的配比对电子烟雾化气溶胶粒径分布的影响。结果表明，1）当醇类溶剂的羟基数目小于3时，溶剂雾化气溶胶粒径分布曲线是单峰，颗粒数浓度峰值在0.02~0.05 μm范围内，且正丁醇>正丙醇≥乙醇；1，4-丁二醇 > 1，2-丙二醇 > 乙二醇。2）丙三醇和1，2，4-丁三醇雾化气溶胶粒径分布曲线呈双峰分布；分别位于0.02~0.05 μm和0.1~1 μm范围。3） PEG200、PEG400雾化气溶胶粒径分布曲线呈双峰分布，分别位于0.05~0.1 μm和0.1~1 μm范围内。4）碳链长度相同时，羟基数目从1增加到3，雾化气溶胶大颗粒数增多。5）随着烟油中1，2-丙二醇比例降低（丙三醇比例增加），雾化气溶胶的大颗粒有增多趋势，雾化气溶胶的每口粒子数浓度降低。 

Effects of alcoholic solvents on particle size distribution of e-cigarette aerosol

The aim of this study is to compare particle size distribution (PSD) of electronic cigarettes (E-cigarette) aerosol with different alcoholic solvents, including alcohol, n-propanol, n-butanol, ethylene glycol, 1,2-propylene glycol, 1,2-butanediol, glycerol, 1,2,4-butanetriol, polyethylene glycol 200 (PEG200), and polyethylene glycol 400 (PEG400). Effects of ratio of the most popular alcoholic solvents, propylene glycol and glycerol, in mixed liquid were also studied. Measurements were conducted by electrical low pressure impactor (ELPI) under same voltage during puffing. Results showed that:1) The particle number concentration of alcohol, n-propanol, n-butanol, ethylene glycol, 1,2-propanediol, 1,2-butanediol showed a single peak curve with the range of 0.02-0.05μm, and the peak value was in the order:alcohol ≤ n-propanol < n-butanol, ethylene glycol < 1,2-propanediol < 1,2-butanediol. 2) Glycerol and 1,2,4-butanetriol presented double peak pattern, in the 0.02-0.05μm and 0.1-1μm, respectively. 3) The PEG200 and PEG400 presented double peak too, in the range of 0.05-0.1μm and 0.1-1μm, respectively. 4) Large particle proportion increased when the number of hydroxy group increased from 1 to 3 in these routine alcohols. 5) Particle size diameters increased while number concentration decreased with higher ratio of glycerol in mixed liquid.