Plasma Sterilization and Safety for Space Industry
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Transcript of Plasma Sterilization and Safety for Space Industry
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PLASMA STERILIZATION AND SAFETY FOR SPACE
INDUSTRY
ENGR 4390 Intro to Plasma EngineeringShawn Robinson
10/30/13
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WHAT IS PLASMA Forth state of Matter Gas Breakdown Ions Electrons Reactive Species Neutral Atoms
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PLASMA DESIGN Thermal Vs. Non-Thermal AC/DC Pressure Conditions Neutral Atom Used
Plasma Jet Configuration(above)Corona Discharge (left)
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SPACE BACTERIA Microbes in High Orbit 4.9 x 10(4) cells/ml No Human resistance Need to reduce colony Closely related to pathogenic species
Live cells(green) damaged cells (orange) brought back from high altitude
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SPACE PACKAGING Plasma deposited silicon oxide films are
found to increase the permeation barrier of packaging materials.
Polyethylene terephthalate (PET) is an important polymer for packaging applications and is established for various kinds of packaging solutions like bottles, containers, or foils
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PLASMA CIRCUIT CCP, Microwave power is applied pulsed
within 1 ms ≤ ton ≤ 24 ms volume of up to 6 L Plasma consisting of hydrogen, nitrogen,
and oxygen
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PROCESS SiOx layer Repeated use for sterilization Deposit layers or kill cells
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SPACE COATINGS Shuttles entering and leaving the
atmosphere can collect these microbes To reduce the chances of contamination
protective coating can be applied Plasma sheet coatings
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PLASMA CIRCUIT The thermal spray is atmospheric
microwave plasma that operates at 2.46 GHz
Argon and Nitrogen (primary gas) Hydrogen and Helium (secondary gas)
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PROCESS Deposit layers without damaging parts Deposition rates are very high in
comparison to alternative coating technologies
tungsten (melting point 3400°C) is sprayed onto aluminum (melting point 660°C) without melting the aluminum
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CONCLUSION Plasma has very many applications in
space Save Money Protect Health
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QUESTIONS?