Proteus Posted August 24, 2009 Share Posted August 24, 2009 How does supercritical drying work? Link to comment Share on other sites More sharing options...
Comandante Posted August 24, 2009 Share Posted August 24, 2009 From what I understand, you pressurise a gas so it becomes liquid. Then use it for whatever you want to use it inside the pressurised vessel and after you finish you reduce the pressure in the vessel, which causes the liquid to change back to gas and evaporate. At least that's how it's used in supercritical extraction of essential oils by liquid carbon dioxide. Liquid CO2 is very good solvent for essential oils, very expensive procedure though. Link to comment Share on other sites More sharing options...
insane_alien Posted August 24, 2009 Share Posted August 24, 2009 in the super critical regime there is no difference between a liquid and a gas. they are no longer seperate phases. Link to comment Share on other sites More sharing options...
UC Posted August 29, 2009 Share Posted August 29, 2009 The wikipedia article does a good job of explaining. If you need something clarified, feel free to ask. http://en.wikipedia.org/wiki/Supercritical_drying Link to comment Share on other sites More sharing options...
Mr Skeptic Posted August 29, 2009 Share Posted August 29, 2009 At high enough pressure and temperature, there it acts like both a liquid and a gas. A cool application is in making aerogels, in which case supercritical drying is vital so that the gel is not crushed by surface tension. Aerogels are fairly strong for their weight, and about as light as air. Link to comment Share on other sites More sharing options...
veldhuiswendy Posted August 29, 2009 Share Posted August 29, 2009 Supercritical resist drying allows the fabrication of high aspect-ratio (AR) resist patterns. The potential of this drying technique to increase the maximum achievable AR and the resolution of the overall lithographic process is analyzed for Hydrogen SilsesQuioxane (HSQ). The maximum achievable AR is doubled compared to conventional nitrogen blow drying. Furthermore, the resolution is improved significantly. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now