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Homogeneous nucleation in supercritical fluids
Author(s) -
Debenedetti Pablo G.
Publication year - 1990
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690360902
Subject(s) - nucleation , supersaturation , supercritical fluid , thermodynamics , surface tension , chemistry , supercritical carbon dioxide , homogeneous , materials science , physics
When a supercritical solution is rapidly expanded, large solute supersaturations can be attained, and small particles are formed. The evolution of the homogeneous nucleation rate, work of nucleus formation, and critical nucleus size along different expansion paths is investigated here for the model system phenanthrene‐carbon dioxide. Nucleation rates are the result of the competition among solvent expansion, cooling due to depressurization, and high supersaturation. Although supersaturations can reach very high values (> 10 6 ), relatively flat nucleation rate profiles result due to cooling and expansion. For an interfacial tension of 0.02 N/m, computed nucleation rates never exceed 10 4 s −1 · cm −3 . A substantial fraction of the maximum nucleation rate is attained with partial decompression to pressures above 1 bar.