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Kinetics of ultrafine coating of SiO 2 nanoparticles, suspended in non-thermal CH 4/C 2H 6 plasma
Journal article   Peer reviewed

Kinetics of ultrafine coating of SiO 2 nanoparticles, suspended in non-thermal CH 4/C 2H 6 plasma

A. Kouprine, F. Gitzhofer, M. Boulos and A. Fridman
Experimental thermal and fluid science, v 31(8), pp 1005-1019
2007
DOI: https://doi.org/10.1016/j.expthermflusci.2006.10.004
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Abstract

Alkanes C:H coating Chemical kinetics Nanopowder Non-thermal plasma Soot
Capacitively coupled RF discharges in methane and ethane (1000–3000 Pa, 5–15 W/cm 3) were used for the in-flight coating of SiO 2 nanopowders (NP) with an a-C:H layer [A. Kouprine, F. Gitzhofer, M. Boulos, A. Fridman, Polymer-like C:H thin film coating of nanopowders in capacitively coupled RF discharge, Plasma Chemistry and Plasma Processing 24 (2) (2004) 189–215]. In this present work a model of the chemical kinetics of this plasma processing has been developed, based on the GRI-Mech 3.0 mechanism [G.P. Smith, D.M. Golden, M. Frenklach, Gas Research Institute, Detailed chemical reaction mechanism. Available from: <http://www.me.berkeley.edu/gri_mech/>], and calculations are performed, using the Chemkin-II code. The model includes the formation of two solid phases: an amorphous C:H coating, deposited on the suspended NP, and soot, incepted in the gas phase. Non-equilibrium plasma effects are taken into account by the rates of radical species’ production, using the reference data on the “ G-value”. The CH 3 and H species appear to have key roles in surface activation and the nanofilm growth. The results demonstrate the competitive character of the formation of the two solid phases: the C:H coating is dominant under T gas < 1400–1600 K, depending on the conditions, and soot commencing to dominate at higher temperatures. This division corresponds to the passage from non-thermal plasma conditions, with the dominance of single-valent radicals and solid phase growth on the substrate only, to the plasma thermalisation with the formation of two-valent radicals and v. inception of the solid phase. The results are validated experimentally by the observation of soot formation as a function of the gas temperature, by the mass spectrograph data on the gas composition after plasma reforming, and by the reference data on coating growth rates and induction times for soot formation.

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Collaboration types
Domestic collaboration
International collaboration
Web of Science research areas
Engineering, Mechanical
Physics, Fluids & Plasmas
Thermodynamics
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