Laboratory Studies of Contact Efflorescence

GSTDTAP

项目编号	1506691
	Laboratory Studies of Contact Efflorescence
	Margaret Tolbert
主持机构	University of Colorado at Boulder
项目开始年	2015
	2015-08-15
项目结束日期	2018-07-31
资助机构	US-NSF
项目类别	Standard Grant
项目经费	438404(USD)
国家	美国
语种	英语
英文摘要	As atmospheric relative humidity cycles, saline aerosols exist either as ionic salts, or as aqueous ionic solution. Supersaturated and undersaturated phase change typically demonstrate hysteresis behavior as a function of relative humidity. The (increasing) RH at which the phase transition abruptly changes from solid particle to a saturated aqueous solution is the deliquescence relative humidity (DRH). The decreasing RH that drying aqueous droplets remain as supersaturated sols until crystallization, is the efflorescence relative humidity (ERH). Efflorescence may differ based on the nucleation mechanism, either by contact with a seed, or immersion of that seed into the supersaturated droplet. The objective of a series of laboratory investigations is to further study contact efflorescence compared to immersion efflorescence on aerosol types and sizes representative of atmospheric particles. Aerosol phase changes in a single droplet optical trap will be used to systematically follow efflorescence mechanisms. The importance of accounting for aerosol particle phase changes includes effects on heterogeneous chemical processes, light scattering, and cloud formation and precipitation. Direct effects on homogeneous (gas phase) chemistry and climate also remain uncertain.
来源学科分类	Geosciences - Atmospheric and Geospace Sciences
文献类型	项目
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/68500
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	Margaret Tolbert.Laboratory Studies of Contact Efflorescence.2015.