Unraveling the "Pressure-Effect" in Nucleation

Details Unraveling the "Pressure-Effect" in Nucleation Unraveling the "Pressure-Effect" in Nucleation

2008-04-09

arxiv.org/abs/0804.1516v3

Phys. Rev. Lett. 101, 125703 (2008)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures. v2: All citations now appear correctly. v3: Updated one point in Fig. 2

Scientific paper

10.1103/PhysRevLett.101.125703

The influence of the pressure of a chemically inert carrier-gas on the nucleation rate is one of the biggest puzzles in the research of gas-liquid nucleation. Different experiments can show a positive effect, a negative effect, or no effect at all. The same experiment may show both trends for the same substance depending on temperature, or for different substances at the same temperature. We show how this ambiguous effect naturally arises from the competition of two contributions: nonisothermal effects and pressure-volume work. Our model clarifies seemingly contradictory experimental results and quantifies the variation of the nucleation ability of a substance in the presence of an ambient gas. Our findings are corroborated by results from molecular dynamics simulation and might have important implications since nucleation in experiments, technical applications, and nature practically always occurs in the presence of an ambient gas.

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