A little hard to answer without more information… For example - is this plain glass (and surface properties morphology controlled) or has the surface been modified (silanized, for example)?

but in either case, if your plasma treatment changes wetting properties - you should modify the type of plasma (N2 for O2, dry for wet, etc) and energetics of plasma (power, duration) to see if less reactive treatments maintain wetting properties while achieving the other goals of the plasma treatment

I agree with James E Hanson.

If you want to have hydrophilicity, then promote dangling bonds on the surface by creating oxygen vacancies. For hydrophobicity, maintaining oxygen bonds or filling the oxygen vacancies with will help.

If you want to have hydrophilicity, then promote dangling bonds on the surface by creating oxygen vacancies. For hydrophobicity, maintaining oxygen bonds or filling the oxygen vacancies with will help.

Dear Celine,

my experience is mainly referring to float glass as for mikroscope use. After an oxygen plasma, I found some loss of weight and also some change in the alkali ion concentration by ESCA depth profiling. The weight loss was recovering quickly while on the balance, so I assume that it was water. The contact angle after the plasma was not measurable as the droplet was spreading immediately. I could not really conserve his property in the lab for longer than a few minutes and I cannot recommend to try it. Nearly any surface leaving an oxygen plasma has a very high energy and will pick up any dirt from athmosphere. This is a general finding from all my trials for plasma cleaning. A monolayer of hydrocarbons in the air/nitrogen/vacuum is enough to spoil the cleaning effect. If important, please send me an e-mail to my company (surface chemistry)

Best wishes, Heinrich