Sabina MazaCorpus Christi ISDDr. David Staack

Assistant Professor Department of Mechanical Engineering

THE INCORPORATION OF COLOR INTO PLASMA ENHANCED

CHEMICAL VAPOR DEPOSITION FILMS

Tsung-Chan “Cliff” TsaiDr. David Staack

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

MMA Polymerization

Applications

Suitable for live tissuesPolymeric bandage on woundsSterilizes

Research Objective

To add a dye under PECVD conditions in order to produce a

colored film.

Method

CI

+ CI

Setup

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)

Thank you!