UC Irvine DIY Plasma Treatment Device (Version 1)
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- เผยแพร่เมื่อ 19 ก.ค. 2013
- Demo of a plasma treatment device for surface modification. This is only a demo, try/use at your own risk. See the updated version of this project: • UC Irvine DIY Plasma T...
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Yes, I have used a manifold and backfilled it with nitrogen. The color of the plasma changes to a deep purple. The manifold was a brass pipe T with 3 ball valves on each side of the T. One side was connected to the vacuum, the other was the chamber, and the third was a regulated nitrogen tank.
Thanks for the video. I set mine up and it's working beautifully. I'm trying to do the same type of treatment to a thin film of mylar (~25um) (PET, polyethylene terepthalate); however, the plastic melts and deforms when I do the treatment (PET melts at 260 C). Is there any robust way to control the power of the plasma / reduce its temperature?
Yes, we use a Variac, the new version of this device solves this issue, will be posting in a couple weeks.
can you help me with some questions? is about get a cheap system to clean some metal surfaces
hey, do you have any report or journal about this experiment? i've tried it but it didn't work, my research wouldn't start without this step. i appreciate if you could help, thanks before
Ever try this with a foodsaver container? Someone else on youtube measured the vacuum pull at 22.5 inHg. The container I have in mind is microwave safe...but I don't necessarily know if that means it's plasma safe. I'm thinking about as much as 20 seconds of treatment.
The container gets hot. We have a new generator made and have demo'ed it using a pyrex bowl and mason jar as the vacuum chambers, will post videos in a couple weeks, stay tuned.
Hi Michael, thanks for the video. I was wondering why you evacuate the chamber in the microwave? Would it be possible to reduce the pressure in a vacuum chamber before putting it in, meaning you don't have to drill through the wall of the microwave?
Cabeleira42 That is possible - in fact you see the same effect if you put a light bulb (incandescent or fluorescent) in a microwave just for a couple of seconds and you will see the same effect. The issue is this, a light bulb is a contained gas system, the material outgasses in a plasma condition but nothing like the polymers that are being treated. So what happens is that the dynamic pressure increases in the plasma condition, and without evacuation, the plasma eventually disappears. You may be able to treat glass parts as you describe.
Nice can you do other plasmas?
What happens if you put metal in the vacuum chamber?
What happen if I put graphite inside the vacuum chamber?
COOL!!!
I want to ask after the treatment, is the temperature high?
Is this a kind of cold plasma?
from before - yes oxygen plasma is possible, but it requires silicone oil (expensive) in the vacuum pump to be safe. So with this oil, it would work. The plasma is a little on the hot side, I believe this is because the microwave energy is too high, I plan on adding a second Microwave oven transformer (for the filament alone) and then add a variac to the main transformer (or possibly a SCR or TRIAC) to reduce the delivered power - it will etch away surfaces with long enough time. After about 5 minutes, the glass bell jar will get too hot to touch.
hey Michael, can it be used to bond 2 PDMS layers? And how about PDMS on glass?
Or is it only good for cleaning glass?
yes, it works
Very cool!
I would like to do this with oxygen.
To avoid the expensive pump and oil, I wonder if using an oil free pump would work well. I have a Rocker 610 and also a Welch vacuum pump I may try this with.
Do you know if an oil free pump can be used safely with oxygen?
How can i design a variac to get continuous output at lower microwave power levels?
Hi, We build the same plasma machine at UCSB. However the chamber floor is made of PVC and is melting when we apply plasma.
what materials that are not glass can you use?t
hanks!
אלכס ט take a look at our second video. In this one we had a glass Bell jar on top of a metal base
I saw that. its not dangerous to put metal in a MW?
אלכס ט no problems with operating the newer version using a metal as. Everything just needs to be grounded at multiple points in the case
great thanks!
Crazy arcing in there! Cool demonstration though! It beats my candle in the microwave for sure.
But you are still going to need to spend some money on a real generator and on replacing the chamber with materials that won't contaminate your project. You can find a better box then a microwave.
besides oxygen plasma
Weakness: gas line, where??
Nice, our lab paid good money for basically the same thing.
Please see the new version of this device our lab built: th-cam.com/video/3S9avsmafKk/w-d-xo.html