Influence of Collecting Substrates on the Characterization of Hygroscopic Properties of Inorganic Aerosol Particles

2014 ◽  
Vol 86 (5) ◽  
pp. 2648-2656 ◽  
Author(s):  
Hyo-Jin Eom ◽  
Dhrubajyoti Gupta ◽  
Xue Li ◽  
Hae-Jin Jung ◽  
HyeKyeong Kim ◽  
...  
Keyword(s):  
Aerosol Particles ◽  
Hygroscopic Properties ◽  
Inorganic Aerosol

scholarly journals Hygroscopic and phase separation properties of ammonium sulfate/organics/water ternary solutions

2015 ◽  
Vol 15 (15) ◽  
pp. 8975-8986 ◽  
Author(s):  
M. A. Zawadowicz ◽  
S. R. Proud ◽  
S. S. Seppalainen ◽  
D. J. Cziczo
Keyword(s):  
Phase Separation ◽  
Ammonium Sulfate ◽  
Atmospheric Aerosols ◽  
Aerosol Particles ◽  
Field Measurements ◽  
Inorganic Salts ◽  
Ample Evidence ◽  
Hygroscopic Properties ◽  
Inorganic Aerosol

Abstract. Atmospheric aerosol particles are often partially or completely composed of inorganic salts, such as ammonium sulfate and sodium chloride, and therefore exhibit hygroscopic properties. Many inorganic salts have well-defined deliquescence and efflorescence points at which they take up and lose water, respectively. Field measurements have shown that atmospheric aerosols are not typically pure inorganic salt, instead, they often also contain organic species. There is ample evidence from laboratory studies that suggests that mixed particles exist in a phase-separated state, with an aqueous inorganic core and organic shell. Although phase separation has not been measured in situ, there is no reason it would not also take place in the atmosphere. Here, we investigate the deliquescence and efflorescence points, phase separation and ability to exchange gas-phase components of mixed organic and inorganic aerosol using a flow tube coupled with FTIR (Fourier transform infrared) spectroscopy. Ammonium sulfate aerosol mixed with organic polyols with different O : C ratios, including 1,4-butanediol, glycerol, 1,2,6-hexanetriol, 1,2-hexanediol, and 1,5-pentanediol have been investigated. Those constituents correspond to materials found in the atmosphere in great abundance and, therefore, particles prepared in this study should mimic atmospheric mixed-phase aerosol particles. Some results of this study tend to be in agreement with previous microscopy experiments, but others, such as phase separation properties of 1,2,6-hexanetriol, do not agree with previous work. Because the particles studied in this experiment are of a smaller size than those used in microscopy studies, the discrepancies found could be a size-related effect.

scholarly journals Hygroscopic and phase separation properties of ammonium sulfate/organic/water ternary solutions

2015 ◽  
Vol 15 (5) ◽  
pp. 6537-6566 ◽  
Author(s):  
M. A. Zawadowicz ◽  
S. R. Proud ◽  
S. S. Seppalainen ◽  
D. J. Cziczo
Keyword(s):  
Phase Separation ◽  
Ammonium Sulfate ◽  
Atmospheric Aerosols ◽  
Inorganic Salt ◽  
Aerosol Particles ◽  
Field Measurements ◽  
Inorganic Salts ◽  
Ample Evidence ◽  
Hygroscopic Properties ◽  
Inorganic Aerosol

Abstract. Atmospheric aerosol particles are often partially or completely composed of inorganic salts, such as ammonium sulfate and sodium chloride, and therefore exhibit hygroscopic properties. Many inorganic salts have well-defined deliquescence and efflorescence points at which they take up and lose water, respectively. Deliquescence and efflorescence of simple inorganic salt particles have been investigated by a variety of methods, such as IR spectroscopy, tandem mobility analysis and electrodynamic balance. Field measurements have shown that atmospheric aerosols are not typically pure inorganic salt, instead they often also contain organic species. There is ample evidence from laboratory studies that suggests that mixed particles exist in a phase-separated state, with an aqueous inorganic core and organic shell. Although phase separation has not been measured in situ, there is no reason it would not also take place in the atmosphere. Many recent studies have focused on microscopy techniques that require deposition of the aerosol on a glass slide, possibly changing its surface properties. Here, we investigate the deliquescence and efflorescence points, phase separation and ability to exchange gas-phase components of mixed organic and inorganic aerosol using a flow tube coupled with FTIR spectroscopy. Ammonium sulfate aerosol mixed with organic polyols with different O : C ratios, including 1,4-butanediol, glycerol, 1,2,6-hexanetriol, 1,2-hexanediol, and 1,5-pentanediol have been investigated. Those constituents correspond to materials found in the atmosphere in great abundance, and therefore, particles prepared in this study should mimic atmospheric mixed phase aerosol particles. The results of this study tend to be in agreement with previous microscopy experiments, with several key differences, which possibly reveal a size-dependent effect on phase separation in organic/inorganic aerosol particles.

scholarly journals Characterization of submicron aerosol particles in winter at Albany, New York

2022 ◽  
Vol 111 ◽  
pp. 118-129
Author(s):  
Xiuli Wei ◽  
Huaqiao Gui ◽  
Jianguo Liu ◽  
Ying Cheng
Keyword(s):  
New York ◽  
Aerosol Particles ◽  
Submicron Aerosol

Physical characterization of aerosol particles during the Chinese New Year’s firework events

2010 ◽  
Vol 44 (39) ◽  
pp. 5191-5198 ◽  
Author(s):  
Min Zhang ◽  
Xuemei Wang ◽  
Jianmin Chen ◽  
Tiantao Cheng ◽  
Tao Wang ◽  
...  
Keyword(s):  
Aerosol Particles ◽  
Physical Characterization

Time-resolved chemical characterization of aerosol particles down to 6 nm diameter in Stockton, California

2013 ◽  
Author(s):  
Arantza Eiguren-Fernandez ◽  
Gregory Lewis ◽  
Steven Spielman ◽  
Susanne Hering
Keyword(s):  
Aerosol Particles ◽  
Chemical Characterization ◽  
Time Resolved

A condensation-growth and impaction method for rapid off-line chemical-characterization of organic submicrometer atmospheric aerosol particles

2003 ◽  
Vol 34 (2) ◽  
pp. 225-242 ◽  
Author(s):  
Berko Sierau ◽  
Frank Stratmann ◽  
Matthias Pelzing ◽  
Christian Neusüß ◽  
Diana Hofmann ◽  
...  
Keyword(s):  
Atmospheric Aerosol ◽  
Aerosol Particles ◽  
Chemical Characterization ◽  
Atmospheric Aerosol Particles ◽  
Condensation Growth

scholarly journals Hygroscopic properties of ultrafine aerosol particles in the boreal forest: diurnal variation, solubility and the influence of sulfuric acid

2007 ◽  
Vol 7 (1) ◽  
pp. 211-222 ◽  
Author(s):  
M. Ehn ◽  
T. Petäjä ◽  
H. Aufmhoff ◽  
P. Aalto ◽  
K. Hämeri ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Boreal Forest ◽  
Diurnal Variation ◽  
Gas Phase ◽  
Aerosol Particles ◽  
Particle Formation ◽  
Time Of Day ◽  
New Particle Formation ◽  
Hygroscopic Growth ◽  
Hygroscopic Properties

Abstract. The hygroscopic growth of aerosol particles present in a boreal forest was measured at a relative humidity of 88%. Simultaneously the gas phase concentration of sulfuric acid, a very hygroscopic compound, was monitored. The focus was mainly on days with new particle formation by nucleation. The measured hygroscopic growth factors (GF) correlated positively with the gaseous phase sulfuric acid concentrations. The smaller the particles, the stronger the correlation, with r=0.20 for 50 nm and r=0.50 for 10 nm particles. The increase in GF due to condensing sulfuric acid is expected to be larger for particles with initially smaller masses. During new particle formation, the changes in solubility of the new particles were calculated during their growth to Aitken mode sizes. As the modal diameter increased, the solubility of the particles decreased. This indicated that the initial particle growth was due to more hygroscopic compounds, whereas the later growth during the evening and night was mainly caused by less hygroscopic or even hydrophobic compounds. For all the measured sizes, a diurnal variation in GF was observed both during days with and without particle formation. The GF was lowest at around midnight, with a mean value of 1.12–1.24 depending on particle size and if new particle formation occurred during the day, and increased to 1.25–1.34 around noon. This can be tentatively explained by day- and nighttime gas-phase chemistry; different vapors will be present depending on the time of day, and through condensation these compounds will alter the hygroscopic properties of the particles in different ways.

Sign in / Sign up

Export Citation Format

Share Document