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The Use of Color Indicators for Plasma Enhanced Chemical Vapor Deposition (PECVD) Films

The Use of Color Indicators for Plasma Enhanced Chemical Vapor Deposition (PECVD) Films. Brian Lopas Physics Teacher Navasota High School, Navasota ISD David Staack, Ph.D. Assistant Professor Department of Mechanical Engineering. Plasma Engineering and Diagnostics Laboratory.

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The Use of Color Indicators for Plasma Enhanced Chemical Vapor Deposition (PECVD) Films

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  1. The Use of Color Indicators for Plasma Enhanced Chemical Vapor Deposition (PECVD) Films Brian Lopas Physics TeacherNavasota High School, Navasota ISDDavid Staack, Ph.D.Assistant Professor Department of Mechanical Engineering

  2. Plasma Engineering and Diagnostics Laboratory Dr. David Staack Tsung-Chan “Cliff” Tsai

  3. What is plasma? • 4th state of matter: ionized gas • Made of freely moving electrons and ions • Electrically charged particles that respond to electric and magnetic fields • Most abundant in the cosmos

  4. Non-Thermal “Cold” Plasma • High temp electrons (20000 °F) • Cold neutral gas – safe to touch Examples: Natural: Aurora borealis Artificial: Fluorescent lamp

  5. Non-Thermal “Cold” Plasma

  6. - - - - - - - - - - - - - - - - - - - + + + + + + + + + + + Power Supply MMA HV Floating substrate Electrode Film (PMMA) Helium Dielectric tube Plasma jet * * * * * * * * * • Characteristics: • Non-thermal plasma • Adhesive to varies surfaces • Sterilizer Plasma Enhanced Chemical Vapor Deposition (PECVD)

  7. Suitable for live tissues • Polymeric bandage on wounds • Sterilizes Applications

  8. What indicator would be suitable to use under PECVD conditions that would produce a colored film? Research Question

  9. Equipment Setup Color Indicator

  10. Bubbler (MMA) Plasma Jet Flow Controllers Power Supply Multimeter Setup Substrate (film produced here)

  11. Solubility of methyl blue on MMA • Stability of methyl blue after plasma ejection • Condition of power supply (i.e. voltage, frequency, etc) • Functionality of methyl blue on PMMA If it works… • Test other color indicators • methyl red • bromothymol blue Experiments

  12. Conditions to incorporate color indicator onto the film • Color indicator solvent/concentration • Voltage • Frequency of electricity • Power • Line spectra • Color indication Data generated

  13. pH sensitivity of the film • Ability to indicate chemical/metabolic changes or re-infection Why a color film?

  14. Use of low temperature plasma to deposit a film • Film is functional band-aid: compatible with live tissues, sterilizes and protects from re-infection • Film could indicate chemical/metabolic changes or re-infection Summary

  15. Dr. David Staack • Tsung-Chan “Cliff” Tsai • Texas A&M University • Mechanical Engineering Department • Plasma Engineering and Diagnostics Laboratory • National Science Foundation (NSF) • Enrichment Experience in Engineering (E3) Acknowledgements

  16. Questions?

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