DOI: 10.1016/j.atmosenv.2018.02.012
Scopus记录号: 2-s2.0-85041555071
论文题名: Liquid-liquid phase separation in internally mixed magnesium sulfate/glutaric acid particles
作者: Wu F ; -M ; , Wang X ; -W ; , Jing B ; , Zhang Y ; -H ; , Ge M ; -F
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 178 起始页码: 286
结束页码: 292
语种: 英语
英文关键词: Glutaric acid
; Liquid-liquid phase separation
; Magnesium sulfate
; Raman spectra
Scopus关键词: Atmospheric aerosols
; Atmospheric humidity
; Dehydration
; Drops
; Hydrophilicity
; Hydrophobicity
; Liquids
; Magnesium
; Phase separation
; Raman scattering
; Separation
; Substrates
; Sulfur compounds
; Confocal Raman microscopy
; Glutaric acid
; Hydrophilic quartz substrates
; Hydrophobic and hydrophilic
; Liquid-liquid phase separation
; Magnesium sulfate
; Morphological evolution
; Polytetrafluoroethylene (PTFE)
; Magnesium compounds
; carboxylic acid
; glutaric acid
; inorganic salt
; magnesium sulfate
; politef
; crystallization
; dehydration
; droplet
; hydrophobicity
; liquid
; Raman spectroscopy
; relative humidity
; separation
; sulfate
; aerosol
; aqueous solution
; Article
; crystal structure
; crystallization
; humidity
; hydrophilicity
; hydrophobicity
; liquid liquid extraction
; morphology
; phase separation
; priority journal
; Raman spectrometry
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: The confocal Raman microscopy is utilized to investigate the liquid-liquid phase separation (LLPS) of mixed magnesium sulfate/glutaric acid (MgSO4/GA) droplets deposited on a hydrophobic polytetrafluoroethylene (PTFE) substrate and a hydrophilic quartz substrate. Raman spectra collected from different regions of the mixed droplets provide detailed information of component distributions for MgSO4 and GA. During the dehydration process, the MgSO4/GA mixed particles show the initial liquid-liquid phase separation between 85% and 80% relative humidity (RH) on both the hydrophobic and hydrophilic substrates. For the droplets deposited on the two substrates, the inner phase of droplets is dominated by aqueous MgSO4, which is surrounded by a rich GA organic layer due to the surface tension effects. In addition, the crystallization of GA could be observed in the organic aqueous phase while it is inhibited in the inner MgSO4 phase due to the effects of gel formation of MgSO4 at low RH. The Raman spectra reveal that with decreasing RH the morphology of the mixed droplet evolves from a uniform droplet to the structure of LLPS with the GA crystallizing in the outer layer and MgSO4 gel formed in the inner phase. These findings contribute to the further understanding of the role of interactions between inorganic salts and organic acids on the morphological evolution and environmental effects of atmospheric aerosols under ambient RH conditions. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82972
Appears in Collections: 气候变化事实与影响
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作者单位: The Institute of Chemical Physics, Key Laboratory of Cluster Science, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, China; School of Chemical Engineering and Pharmaceutics, Henan University of Science and Technology, Luoyang, China; Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
Recommended Citation:
Wu F,-M,, Wang X,et al. Liquid-liquid phase separation in internally mixed magnesium sulfate/glutaric acid particles[J]. Atmospheric Environment,2018-01-01,178