二氧化硫/水/空气体系气溶胶成核实验研究

HFCAS OpenIR

	二氧化硫/水/空气体系气溶胶成核实验研究
其他题名	Experimental evaluation of aerosol formation in SO_2/H_2O/air mixtures
	2015-01-01
发表期刊	中国环境科学
ISSN	1000-6923
摘要	以X-射线为辐射电离源对二氧化硫/水/空气体系的气溶胶成核过程进行了研究.实验结果表明,新生粒子来源于离子诱导成核与均相成核两种机制,前者产生带电颗粒,后者产生中性颗粒.离子对粒子成核有着重要的贡献,对粒子生长作用不明显,SO2对粒子成核与生长均有贡献.成核粒子谱分布呈双峰模式,其峰值会随着气体流速发生偏移.在低SO2浓度情况下,离子诱导成核占主导地位,随着SO2浓度的增加,均相成核的作用越来越明显.
其他摘要	New particle formation phenomena in the troposphere have received considerable attention, but the exact mechanism controlling the early stages of aerosol nucleation and growth is still not understood. In this paper, soft X-ray radiolysis of SO2/H2O/Air gas mixtures is carried out to investigate the competitive processes of ion-induced and binary homogeneous nucleation, experimentally. The electrical mobility distributions of newly formed particles were measured with a scanning mobility particle sizer（SMPS）. Charged particles in the system are indicative of ion-induced nucleation; uncharged particles are produced by homogeneous nucleation. Ion, which mainly contributed to aerosol nucleation process, had nearly no effect on aerosol growth process. In contrast, SO2 enhanced both aerosol nucleation and growth process. The electrical mobility distribution of nanometer-sized particles appeared to be bimodal peaks. The position of big ones would shift with the flow rate of the gas mixture. At low SO2 concentrations, ion-induced nucleation mechanism may be a dominant factor; however, at increased SO2 concentrations the contribution of binary homogeneous nucleation relative to that of ion-induced nucleation increases accordingly.
关键词	气溶胶新粒子形成均相成核离子诱导成核
收录类别	CSCD
语种	中文
CSCD记录号	CSCD:5383927
引用统计	被引频次：2[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/64165
专题	中国科学院合肥物质科学研究院
推荐引用方式 GB/T 7714	. 二氧化硫/水/空气体系气溶胶成核实验研究[J]. 中国环境科学,2015,000.
APA	(2015).二氧化硫/水/空气体系气溶胶成核实验研究.中国环境科学,000.
MLA	"二氧化硫/水/空气体系气溶胶成核实验研究".中国环境科学 000(2015).