Colloid and Polymer Science

, Volume 271, Issue 2, pp 162–172 | Cite as

Nucleation from supersaturated water vapors onn-dodecane substrate: A reverse Wilson chamber (RWC) method study

  • A. D. Alexandrov
  • M. Z. Avramov
Original Contributions

Abstract

The reverse Wilson chamber method (RWC), developed for heterogencous nucleation investigation is applied to critical supersaturation measurements and determination of the surface concentration of nuclei (droplets) vs. supersaturation dependence in the case of nucleation from supersaturated water vapors onn-dodecane substrate. The experimental results obtained are interpreted in terms of the classical (Volmer) theory of heterogeneous nucleation as well as in the framework of the theory of barrierless nucleation. The several times lower critical supersaturations measured at four different temperatures, covering the range between 20° and 35° C, are explained by taking into account the effect of the negative line tension of three-phase contact. The temperature dependence of line tension for the three-phase systemn-dodecane/water/water vapor is extracted from the data to fir the theory. The results obtained are in complete disagreement with those ones obtained by Wu and Maa for the same system using jet-tensimeter technique, however, in another temperature interval. This discrepancy is discussed in detail in the text.

Key words

Line tension heterogeneous nucleation reverse Wilson chamber barrierless nucleation temperature dependence of line tension condensation on substrate 

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Copyright information

© Steinkopff-Verlag 1993

Authors and Affiliations

  • A. D. Alexandrov
    • 1
  • M. Z. Avramov
    • 2
  1. 1.Department of Nucleation, Central Laboratory of Mineral ProcessingBulgarian Academy of SciencesSofiaBulgaria
  2. 2.Department of Physical Chemistry, Faculty of ChemistryUniversity of SofiaBulgaria

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