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Sabina MazaCorpus Christi ISDDr. David Staack
Assistant Professor Department of Mechanical Engineering
THE INCORPORATION OF COLOR INTO PLASMA ENHANCED
CHEMICAL VAPOR DEPOSITION FILMS
4th state of matter: ionized gas
Most abundant in the cosmos Made of electrons and ions Electrically charged particles that respond to electric
and magnetic fields
What is plasma?
High temp electrons (20000 °F)
Cold neutral gas –safe to touch
Examples:
LOW-TEMP PLASMA
Natural Aurorae borealis
Artificial Fluorescent lamp
Plasma in action
Plasma Enhanced Chemical Vapor Deposition (PECVD)
MMA
Floating substrate
HV
Power Supply
Helium
+-
--
-- -
- - -- -
- --
++
+ + ++ +
+++- - -
-
-
Electrode
Dielectric tube Plasma jet
* **
* *
*
**
*
Film
Characteristics• Non-thermal plasma• Adhesive to varies surfaces• Sterilizer
Experiments
Solubility of dye in MMA
In solutionSublimed
Stability of dye after plasma
ejection
Optimal conditions of power supply
Properties on PMMA
Select new dyes
1
4
3
26
5
Data Generated Conditions to incorporate color indicator onto the
filmColor indicator solvent and concentrationSublimation temperature and gas flowPower supply
○ Voltage○ Frequency of electricity○ Line spectra○ Power
Color changes on film (spectral analysis)
Sensitive to changes in pH or temperature
Could signal chemical and/or metabolic changesmicrobial activity
WHY A COLOR FILM?
Summary
Use of low temperature plasma to deposit a film
Film is functional band-aid: compatible with life tissues, sterilizers and protects from re-infection
Film could indicate chemical/metabolic changes or microbial activity
Relatedness to Class Concepts
Matter
Physical and Chemical Changes
Atom and Atomic Theory
Ions
Bonding
Chemical Reactions
Solutions
pH
Acknowledgements
Enrichment Experience in Engineering (E3)
Dr. David Staack Tsung-Chan “Cliff” Tsai Texas A&M University Mechanical Engineering Department National Science Foundation (NSF)