Geoscience Reference
In-Depth Information
δ
4.683, because of the presence of H
2
O as an impurity along with D
2
O. The
other peak at
2.60 is due to DMSO. This clearly shows that Ammonium
Sulfate dust particulates are actually coated with DMSO.
δ
4.4
. Variation of crystal count and dimension
with seeding temperature in case of DMSO-
coated Ammonium Sulfate
The variation of crystal count with seeding temperature for the second
experiment is presented in Fig. 4. The modal value of dimension of
all the crystals measured in 80 fields of view of the microscope at a
seeding temperature is also presented in the same figure. The crystal
count and modal value of dimension have significant consistency with
the variation of seeding temperature. Like the previous experiment, the
seeding temperature was varied from
22.0
◦
Cto0
◦
C. The most dominant
distinction between the two experiments is in the count of crystals. The
crystal count has gone up many folds particularly at the peak values,
though the crystal dimension remained almost unaltered. The highest peak
in the crystal count occurred at
−
21.0
◦
C, which is the eutectic temperature
of DMSO and water combine. The second highest peak in crystal count
occurred at
−
18.2
◦
C, which is the eutectic temperature of Ammonium
−
Fig. 4. Variation of crystal count and modal value of crystal dimension with seeding
temperature in case of DMSO-coated Ammonium Sulfate.
