TITLE

Plasma-photocatalyst interaction: Production of oxygen atoms in a low pressure discharge

AUTHOR(S)
Guaitella, O.; Gatilova, L.; Rousseau, A.
PUB. DATE
April 2005
SOURCE
Applied Physics Letters;4/11/2005, Vol. 86 Issue 15, p151502
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A pulsed dc low pressure discharge in air (210 Pa) is used to study the mechanisms of activation of a photocatalytic material (TiO2) under plasma exposure. It is first shown that the presence of TiO2 inside the plasma region leads to a strong increase of the reduced electric field. Time resolved measurement of the atomic oxygen density is performed by actinometry during a 10 ms pulse at a low repetition rate (1 Hz) with and without TiO2 pellets inside the plasma region. The presence of TiO2 pellets strongly increases the O atom density during the first millisecond, but this effect saturates for longer exposure times.
ACCESSION #
17185434

 

Related Articles

  • Detailed model of the afterglow region of a microwave generated oxygen plasma. Chou, Chin-Hao; Wei, Ta-Chin; Phillips, Jonathan // Journal of Applied Physics;8/1/1992, Vol. 72 Issue 3, p870 

    Presents a study that investigated a one-dimensional model of the concentration of oxygen atoms in nonisothermal, low pressure, moderate flow rate, high radical concentration, oxygen afterglow plasma. Importance of afterglow plasma reactors; Use of traditional Langmuir double probe; Measurement...

  • Effect of electric fields and fluctuations on confinement in a bumpy torus. Hiroe, S.; Glowienka, J. C.; Hillis, D. L.; Wilgen, J. B.; Chen, G. L.; Cobble, J. A.; El Nadi, A. M.; Goyer, J. R.; Solensten, L.; Casson, W. H.; Hankins, O. E.; Quon, B. H. // Physics of Fluids (00319171);Mar87, Vol. 30 Issue 3, p847 

    In order to understand the relationships between confinement and space potential (electric field) and between confinement and density fluctuations, plasma parameters in the ELMO Bumpy Toms Scale (EBT-S) [in Plasma Physics and Controlled Nuclear Fusion Research (IAEA, Tokyo, 1974), Vol. 2, p....

  • On existence of the spatial charge layers in plasma with regions of rapid growth of the ionization rate. Lebedev, Yu. A.; Tatarinov, A. V.; Epstein, I. L. // European Physical Journal D -- Atoms, Molecules, Clusters & Opti;Dec2009, Vol. 53 Issue 3, p319 

    1D quasi-static self-consistent model of nonequilibrium nitrogen and oxygen plasma with highly non-uniform spatial distribution of the electric field strength is used for analysis of the correlation of ionization rate profile and charged particles profiles. It is shown that inside a region of...

  • Ionization mechanism in a direct current discharge plasma in an argon-oxygen mixture. Rybkin, V.; Smirnov, S.; Ivanov, A. // High Temperature;Oct2011, Vol. 49 Issue 5, p755 

    We present the results of calculating the charged particle formation and decay rates in a dc discharge positive column in argon-oxygen mixture. The calculations are based on a combined solution to the Boltzmann equation; vibration kinetics equations for the ground state of the O molecule; and...

  • Ionization in strong electric fields and dynamics of nanosecond-pulse plasmas. Macheret, S. O.; Shneider, M. N.; Murray, R. C. // Physics of Plasmas;Feb2006, Vol. 13 Issue 2, p023502 

    The paper describes experimental and computational studies of weakly ionized air plasmas sustained by high repetition rate high-voltage nanosecond pulses. The experimentally determined energy cost per newly produced electron in these diffuse volumetric plasmas is on the order of 100 eV, two...

  • Effect of mixture composition on the electrophysical parameters and emission spectra of HCl-O and HCl-Ar plasma. Pivovarenok, S.; Dunaev, A.; Murin, D.; Efremov, A.; Svettsov, V. // High Temperature;Aug2011, Vol. 49 Issue 4, p491 

    The effect of the composition of a mixture on the electrophysical parameters and emission spectra of HCl-O and HCl-Ar plasma was analyzed. Data on the gas temperature and reduced electric-field intensity are obtained. Based on an analysis of the emission spectra of plasma, the dilution of HCl...

  • Charge screening in a plasma with an external ionization source. Filippov, A. V.; Zagorodny, A. G.; Momot, A. I.; Pal, A. F.; Starostin, A. N. // Journal of Experimental & Theoretical Physics;Jan2007, Vol. 104 Issue 1, p147 

    An asymptotic theory for the screening of the electric field of a dust particle or a spherical probe in a plasma with an external steady and/or internal (proportional to the electron density) gas ionization source has been developed for the first time. It has been established that the screening...

  • Formation of the microscopic structure of high-voltage nanosecond diffuse discharges in sharply nonuniform geometry. Karelin, V. I.; Tren'kin, A. A. // Technical Physics;Sep2008, Vol. 53 Issue 9, p1236 

    The possibility of the development of ionization instability in the avalanche and plasma phases (of the long-wave and short-wave type, respectively) is demonstrated for high-voltage nanosecond discharges in sharply nonuniform geometry. Specific implementation is determined by the electric field...

  • Inhomogeneous extended hollow cathode discharge for raising the current density in a forevacuum plasma source of a ribbon electron beam. Klimov, A.; Burachevsky, Yu.; Burdovitsyn, V.; Oks, E. // Technical Physics;Apr2008, Vol. 53 Issue 4, p432 

    The plasma parameters and the emissivity of a ribbon electron beam source based on a discharge with an inhomogeneous extended hollow cathode are measured. A constriction in the cathode cavity increases the plasma density near the emitting area boundary, which adds to the electron current density...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics