On OH production in water containing atmospheric pressure plasmas
- 23 July 2010
- journal article
- Published by IOP Publishing in Plasma Sources Science and Technology
- Vol. 19 (4), 045025
- https://doi.org/10.1088/0963-0252/19/4/045025
Abstract
In this paper radical production in atmospheric pressure water containing plasmas is discussed. As OH is often an important radical in these discharges the paper focuses on OH production. Besides nanosecond pulsed coronas and diffusive glow discharges, several other atmospheric pressure plasmas which are of interest nowadays have a typical electron temperature in the range 1–2 eV and an ionization degree of 10−5–10−4. These properties are quite different from the typical plasma properties known from low pressure gas discharges. In the plasma physics literature OH production is primarily ascribed to be due to electron, metastable induced or thermal dissociation of water, processes which are dominant in (low pressure) gas discharges and in combustion and hot flames. It is shown in this paper that for several atmospheric pressure plasmas also dissociative recombination can be an effective method of OH radical production. Several examples are presented in detail. This paper provides a basic framework for OH production in atmospheric pressure plasmas and shows that accurate knowledge of ne, Te, Tg, the dominant ionic species, radical and neutral species are indispensable to obtain a complete view on the chemical kinetics in these challenging complex atmospheric pressure plasmas. A few relevant plasma diagnostics together with their limitations are also briefly discussed in this context.Keywords
This publication has 51 references indexed in Scilit:
- Water Purification by Plasmas: Which Reactors are Most Energy Efficient?Plasma Chemistry and Plasma Processing, 2009
- Plasma medicine: an introductory reviewNew Journal of Physics, 2009
- Non-thermal plasmas in and in contact with liquidsJournal of Physics D: Applied Physics, 2009
- Repetitively pulsed atmospheric pressure discharge treatment of rough polymer surfaces: I. Humid air dischargesPlasma Sources Science and Technology, 2008
- Low pressure water vapour discharge as a light source: I. Spectroscopic characteristics and efficiencyJournal of Physics D: Applied Physics, 2008
- Corona Above Water Reactor for Systematic Study of Aqueous Phenol DegradationPlasma Chemistry and Plasma Processing, 2006
- Formation of reactive species in gliding arc discharges with liquid waterJournal of Electrostatics, 2006
- Cross Sections for Electron Collisions with Water MoleculesJournal of Physical and Chemical Reference Data, 2005
- Atmospheric-pressure plasma technologyPlasma Physics and Controlled Fusion, 2004
- Laser induced fluorescence spectroscopy in flamesProgress in Energy and Combustion Science, 1997