Experimental study of homogeneous nucleation from the bismuth supersaturated vapor: Evaluation of the surface tension of critical nucleus (Articolo in rivista)

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  • Experimental study of homogeneous nucleation from the bismuth supersaturated vapor: Evaluation of the surface tension of critical nucleus (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1063/1.4725535 (literal)
Alternative label
  • A. A. Onischuk; S. V. Vosel; O. V. Borovkova; A. M. Baklanov; V. V. Karasev; S. di Stasio (2012)
    Experimental study of homogeneous nucleation from the bismuth supersaturated vapor: Evaluation of the surface tension of critical nucleus
    in THE JOURNAL OF CHEMICAL PHYSICS; AIP, American institute of physics, Melville, NY (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • A. A. Onischuk; S. V. Vosel; O. V. Borovkova; A. M. Baklanov; V. V. Karasev; S. di Stasio (literal)
Pagina inizio
  • 1 (literal)
Pagina fine
  • 8 (literal)
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  • http://biblioproxy.cnr.it:2455/resource/1/jcpsa6/v136/i22/p224506_s1 (literal)
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  • 136 (literal)
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  • 8 (literal)
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  • 224506 (literal)
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  • A. A. Onischuk; S. V. Vosel; O. V. Borovkova; A. M. Baklanov; V. V. Karasev: INSTITUTE of CHEMICAL KINETICS and COMBUSTION -RAS Novosibirsk S. di Stasio: Istituto Motori CNR (literal)
Titolo
  • Experimental study of homogeneous nucleation from the bismuth supersaturated vapor: Evaluation of the surface tension of critical nucleus (literal)
Abstract
  • The homogeneous nucleation of bismuth supersaturated vapor is studied in a laminar flow quartz tube nucleation chamber. The concentration, size, and morphology of outcoming aerosol particles are analyzed by a transmission electron microscope (TEM) and an automatic diffusion battery (ADB). The wall deposit morphology is studied by scanning electron microscopy. The rate of wall deposition is measured by the light absorption technique and direct weighting of the wall deposits. The confines of the nucleation region are determined in the \"supersaturation cut-off\" measurements inserting a metal grid into the nucleation zone and monitoring the outlet aerosol concentration response. Using the above experimental techniques, the nucleation rate, supersaturation, and nucleation temperature are measured. The surface tension of the critical nucleus and the radius of the surface of tension are determined from the measured nucleation parameters. To this aim an analytical formula for the nucleation rate is used, derived from author's previous papers based on the Gibbs formula for the work of formation of critical nucleus and the translation-rotation correction. A more accurate approach is also applied to determine the surface tension of critical drop from the experimentally measured bismuth mass flow, temperature profiles, ADB, and TEM data solving an inverse problem by numerical simulation. The simulation of the vapor to particles conversion is carried out in the framework of the explicit finite difference scheme accounting the nucleation, vapor to particles and vapor to wall deposition, and particle to wall deposition, coagulation. The nucleation rate is determined from simulations to be in the range of 109-1011 cm-3 s-1 for the supersaturation of Bi2 dimers being 1017-107 and the nucleation temperature 330-570 K, respectively. The surface tension ?S of the bismuth critical nucleus is found to be in the range of 455-487 mN/m for the radius of the surface of tension from 0.36 to 0.48 nm. The function ?S changes weakly with the radius of critical nucleus. The value of ?S is from 14% to 24% higher than the surface tension of a flat surface (literal)
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