The Effect of Sur factants on the Deliquescence of Sodium Chlor ide
Date Issued
1999-07-31
Date
1999-07-31
Author(s)
DOI
882211E002028
Abstract
In this study, the deliquescence
phenomenon of sodium chloride aerosol withsurfactants was investigated at retention time
4.24 sec. Two surfactants used in this study,
including glutaric acid and pyruvic acid,
because they both are found in atmospheric
aerosol and show surface active property.
The experimental system consists of a
relative humidity conditioner, a tandem
differential mobility analyzer (TDMA) and a
scanning mobility particle sizing (SMPS)
system. The results of sodium chloride
aerosol showed that the deliquescence point
of sodium chloride aerosol was found at
75%RH and the growth size of sodium
chloride aerosol is 79.47nm and the growth
ratio is 77.9%. Surfactants were mixed with
sodium chloride internally at six different
weight fractions of surfactant, includes 2.5, 5,
10, 20, 40, and 60 %wt. The presence of
both surfactants appear to decrease the
deliquescence point of sodium chloride, the
lowest deliquescence point were both
observed at about 71%RH when the weight
fraction of surfactants are 60%wt. And the
lowest size of sodium chloride aerosol with
surfactants was found to be 142.7nm at
60%wt of pyruvic acid. The deliquescence
point and size of sodium chloride aerosol
with surfactants were related to the weight
fraction of surfactants. It indicates that the
presence of surfactants on sodium chloride
aerosol change the deliquescence
phenomenon of sodium chloride, and the
negative effect is shown.
Subjects
Deliquescence
Surfactant
Organic aerosol
Hygroscopic
Publisher
臺北市：國立臺灣大學環境工程學研究所
Type
report
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