NUCLEATION LABORATORY
EFFECTS
OF BACKGROUND GASES ON THE
HOMOGENEOUS NUCLEATION OF VAPORS III.
J.
Phys. Chem. 100, 9762 (1996)
Anne
Bertelsmann, Ryan Stuczynski, and Richard H. Heist
RESEARCH
SUMMARY
In this paper we report new results
of nucleation measurements carried out in our laboratory at a variety of
constant total pressures for 1-propanol vapor with nitrogen, helium, and
hydrogen as background gases and for 1-butanol vapor with nitrogen, and hydrogen
as background gases. In addition,
we report new results of nucleation experiments carried out at a variety of
constant temperatures for 1-butanol with helium and hydrogen as background
gases.
The
1-butanol constant temperature results compare well with the results of the
1-butanol constant total pressure experiments; and the constant total pressure
data for 1-propanol obtained in this investigation compare well with constant
temperature results obtained from 1-propanol experiments described in the
literature.
The
results of this investigation continue to suggest a significant role of the
background gas in the nucleation process. Our
constant pressure and constant temperature experiments reported here give new
results that reinforce our earlier observations that as the amount of background
gas is increased, the rate of nucleation decreases.
We continue to find that the magnitude of this effect becomes greater as
the molecular weight of the condensable increases.
Similarly, for all of the alcohols we have investigated, this effect
becomes greater as the formula weight of the background gas increases; and the
slope of the dependence of the critical supersaturation on total pressure
increases as the temperature decreases.
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