Abstract
Thermodynamic analysis has shown that particles dried from multicomponent aqueous aerosols do not have a homogeneous chemical morphology except at the eutonic point. The particles are composed of a pure salt core surrounded by a mixed salt coating, where the core composition is solely determined by the original aerosol composition but the coating is identical in chemical composition to the eutonic point and is independent of the original component mole fractions. Rapid Single-particle Mass Spectrometry (RSMS) has been used to probe the chemical composition of particles dried from KCl/NaCl, KCl/KI, and (NH4)2SO4/NH4NO3 mixed solutions at different mole ratios. By measuring the peak area ratios corresponding to the intensity of certain ions in the spectrum, the chemical composition of the surface layer can be inferred. The results suggest that the surface layer is enriched with the minor component and are consistent with our thermodynamic predictions. The significance of the dried particle morphology to its mass transport characteristics is discussed.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 68-77 |
| Number of pages | 10 |
| Journal | Journal of Colloid and Interface Science |
| Volume | 183 |
| Issue number | 1 |
| DOIs | |
| State | Published - Oct 15 1996 |
| Externally published | Yes |
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Keywords
- atmospheric aerosols
- crystallization
- deliquescence
- efflorescence
- laser desorption/ionization
ASJC Scopus subject areas
- Colloid and Surface Chemistry
- Physical and Theoretical Chemistry
- Surfaces and Interfaces
Cite this
Multicomponent aerosol crystallization. / Ge, Zhaozhu; Wexler, Anthony S.; Johnston, Murray V.
In: Journal of Colloid and Interface Science, Vol. 183, No. 1, 15.10.1996, p. 68-77.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Multicomponent aerosol crystallization
AU - Ge, Zhaozhu
AU - Wexler, Anthony S.
AU - Johnston, Murray V.
PY - 1996/10/15
Y1 - 1996/10/15
N2 - Thermodynamic analysis has shown that particles dried from multicomponent aqueous aerosols do not have a homogeneous chemical morphology except at the eutonic point. The particles are composed of a pure salt core surrounded by a mixed salt coating, where the core composition is solely determined by the original aerosol composition but the coating is identical in chemical composition to the eutonic point and is independent of the original component mole fractions. Rapid Single-particle Mass Spectrometry (RSMS) has been used to probe the chemical composition of particles dried from KCl/NaCl, KCl/KI, and (NH4)2SO4/NH4NO3 mixed solutions at different mole ratios. By measuring the peak area ratios corresponding to the intensity of certain ions in the spectrum, the chemical composition of the surface layer can be inferred. The results suggest that the surface layer is enriched with the minor component and are consistent with our thermodynamic predictions. The significance of the dried particle morphology to its mass transport characteristics is discussed.
AB - Thermodynamic analysis has shown that particles dried from multicomponent aqueous aerosols do not have a homogeneous chemical morphology except at the eutonic point. The particles are composed of a pure salt core surrounded by a mixed salt coating, where the core composition is solely determined by the original aerosol composition but the coating is identical in chemical composition to the eutonic point and is independent of the original component mole fractions. Rapid Single-particle Mass Spectrometry (RSMS) has been used to probe the chemical composition of particles dried from KCl/NaCl, KCl/KI, and (NH4)2SO4/NH4NO3 mixed solutions at different mole ratios. By measuring the peak area ratios corresponding to the intensity of certain ions in the spectrum, the chemical composition of the surface layer can be inferred. The results suggest that the surface layer is enriched with the minor component and are consistent with our thermodynamic predictions. The significance of the dried particle morphology to its mass transport characteristics is discussed.
KW - atmospheric aerosols
KW - crystallization
KW - deliquescence
KW - efflorescence
KW - laser desorption/ionization
UR - http://www.scopus.com/inward/record.url?scp=0030588198&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0030588198&partnerID=8YFLogxK
U2 - 10.1006/jcis.1996.0519
DO - 10.1006/jcis.1996.0519
M3 - Article
AN - SCOPUS:0030588198
VL - 183
SP - 68
EP - 77
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
SN - 0021-9797
IS - 1
ER -