Air Water Microwave. C. M. Ferreira, E. Tatarova, J. Henriques, F. M. Dias

Transcription

1 Air Water Microwave C. M. Ferreira, E. Tatarova, J. Henriques, F. M. Dias Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Lisbon, Portugal B. Gordiets Lebedev Institute of Physics, Moscow, Russia

2 Summary Motivation Plasma interaction with living matter on the cutting edge of low-temperature plasma research Microwave discharges driven by surface waves Properties and advantages as sources of reactive species Theoretical model of an air-water microwave plasma source (discharge & afterglow) NO(X) flux in the afterglow plasma jet

3 Motivation

4 Motivation Plasma Medicine Surface Biological

5 Motivation Plasma Medicine Surface Plasma Therapy Biological

6 Motivation Plasma Medicine Surface Plasma Therapy Biological Plasma <===> Living Ma0er

7 Motivation Plasma Medicine Surface Plasma Therapy Biological Plasma <===> Living Ma0er Plasmas can initiate, promote, control and catalyze complex biochemical processes in living matter Plasma biomedical applications need reliable and user-friendly plasma sources.

8 NO - Therapy

9 NO - Therapy Nobel Prize in medicine and biology awarded in 1998 to R. F. Furchgott, L. J. Ignarro, and F. Murad for their work on the function of NO as a signal molecule

10 NO - Therapy Nobel Prize in medicine and biology awarded in 1998 to R. F. Furchgott, L. J. Ignarro, and F. Murad for their work on the function of NO as a signal molecule NO effects on wound healing and inflammatory processes

11 NO - Therapy Nobel Prize in medicine and biology awarded in 1998 to R. F. Furchgott, L. J. Ignarro, and F. Murad for their work on the function of NO as a signal molecule NO effects on wound healing and inflammatory processes Treatment of wound pathologies

12 NO - Therapy Nobel Prize in medicine and biology awarded in 1998 to R. F. Furchgott, L. J. Ignarro, and F. Murad for their work on the function of NO as a signal molecule NO effects on wound healing and inflammatory processes Treatment of wound pathologies Treatment of inflammatory and destructive illnesses:

13 NO - Therapy Nobel Prize in medicine and biology awarded in 1998 to R. F. Furchgott, L. J. Ignarro, and F. Murad for their work on the function of NO as a signal molecule NO effects on wound healing and inflammatory processes Treatment of wound pathologies Treatment of inflammatory and destructive illnesses: pulmonology, phthisiology, traumatology and orthopedics, dentistry, gynecology, maxillofacial surgery, ophthalmology, dermatology, otorhinolaryngology, gastroenterology, etc.

14 Surface Wave Driven Plasma Source Wave to plasma power transfer physical basis of discharges sustained by surface waves Power f = 2.45 GHz SW Ε Launcher Dielectric tube Plasma Advantages: compact, economical electrodeless large power density high concentration of active species follow the geometry of the guiding surface

15 Air Water Plasma Source Flux Exhaust SRS RGA 200 Mass Analyzer f = 2.45 GHz To sewers Control cables High-Voltage Magnetron Circulator H 2 O load Waveguide-Surfatron stubs Quartz tube Plasma Adjustable short-circuit Differential Pumping System High-Voltage Generator And Magnetron Controller Reflected power detector Electric valve Q t Compressed Air Water p = 1 bar [Air (98%) - H 2 O( 2%)] P = W Q = sccm Air Air Q W (Air+Water Vapor) Water Tank Mass Flow Controllers E. Tatarova, F. M. Dias, E. Felizardo, J. Henriques, C. M. Ferreira and B. Gordiets, Plasma Sources Sci. Technol. 17, (2008)

16 1D Self-consistent Model of the Air Water Plasma Torch Maxwell s equations; Dispersion equation for TM surface mode; Continuity equations for vibrationally excited states of ground state N 2 (X) molecules; Continuity equations for excited states of molecules and atoms [N 2 (A), N 2 (B), N 2 (C), N 2 (a ), N( 2 D), N( 2 P), O 2 (a), O 2 (b), O( 1 D), O( 1 S)]; Continuity equations for ions and electrons [N 2+, N 4+, O +, O 2+, O 4+, NO +, NO 2+, H 2 O +, H 3 O +, H 2+, H 3+, HN 2+, NH 3+, NH 4+, O, O 2, O 3, H, OH, NO 2, NO 3 ]; Continuity equations for ground state molecules and atoms [ N, O, O 3, NO, N 2 O, NO 2, NO 3, N 2 O 5, H 2 O, H, H 2, OH, HO 2, H 2 O 2, NH 3, NH 2, NH, HNO, HNO 2, HNO 3 ]; Gas thermal balance equation; Equation of mass conservation for the fluid as a whole. E. Tatarova, F. M. Dias, E. Felizardo, J. Henriques, M. Pinheiro, C. M. Ferreira and B. Gordiets, J. Appl. Phys. 108, (2010)

17 Air Water Plasma Source Gas Temperature Axial Variation

18 Air Water Plasma Source NO(X) axial variation

19 NO(X) generation [NO] vs. microwave power

20 O( 3 P) generation [O( 3 P)] vs. microwave power

21 NO(X) generation [NO] vs. total gas flow Main Source Channels N + O 2 O + NO O + N 2 N + NO τ NO > τ R Main Loss Channels NO + O O 2 + N NO + N N 2 + O

22

23 Conclusions

24 Conclusions Surface wave driven plasma torch is a promising plasma source for biomedical applications; High population density of NO(X) in the afterglow plasma jet (up to ppm) can be achieved; High population density of ground state atoms O( 3 P) can be reached in the discharge zone.

25 Thanks for your attention!