From: Merle Hirsh <plasma@frontiernet.net>
Newsgroups: sci.physics.plasma
Subject: Re: cold plasma and PTFE
Organization: Plasma Resources
References: <78i935$22e$1@jupiter.cs.uml.edu>
Reply-To: plasma@frontiernet.net



Michael Attwood wrote:
>
> I am currently in possession of cold plasma oven for which there is little
> technical support available. I am attempting to use the oven to attack a
> polished PTFE surface so that the surface will become wetable.
>
> If you know what i'm talking about here's some detail:
> 15%N2/75%H2/10%O2 at 300mtorr
> 3000Watts,70C start to 90-110C finish
>
> To measure the attack on the PTFE i'm using a 2dm2 PTFE rate panel in the
> oven I expect a weight loss of about 0.0040g. Instead of seeing a weight
> loss i see a weight gain of approximately 0.0040g, even when there is no
> other material deliberately placed in the oven. This gain in weight can be
> removed by gentle washing in water and oven drying, i then see the expected
> weight loss.
> I would be pleased to hear from anyone working on a similar project or
> anyone with a constructive comment.
>
> Mike
Hi, Mike

Do you have to wash the panel off, or can you simply oven dry it to
observe the weight loss? You have H2 and O2 in the gas mix; are you
just depositing some plasma generated H2O on the surface?

Merle Hirsh