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Next Subject		 UltrafiltrationRoger2000-09-05Click here to register.
I have a isopropanol solution of small silica particles (10 nm)that contains dissolved organic matter that I need to remove. Would ultrafiltration be an option? If so, what set-up do you recommend?
 
RE: Ultrafiltration
lil stevie2000-09-06Click here to register.
It depends a lot on the volumes you anticipate dealing with and what the size distribution of your silica particles is.

For smaller volumes (several liters or less) you might try gravity or vacuum filtration with a tightly woven Teflon filter (see spectrum chromatography's 124090) or possibly even a very-slow paper filter.

For process volumes you'd probably need some kind of tangential filtration setup and I don't know anything about those.
 
RE: Ultrafiltration
Roger2000-09-11Click here to register.
Thank you for your response Lil Stevie. I am interested in 100 mL-type volumes. I want to clarify that I am trying to dispose of the organic matter and use the silica particle dispersion in IPA. The silica particles size range is about 8-12 nm. What is the smallest volume tangential filter set that Spectrum offers.
 
RE: Ultrafiltration
lil stevie2000-09-14Click here to register.
Roger:

Spectrum's MicroKros filter system may be suitable for what you're tyring to do. They have some small cartridges with polysulfone membranes that will probably stand up to your media.

The person that probably knows most about these is Dave Libby. You can call him from 9 to 4 California time at (800) 630-3300. I haven't got a clue what his extension is (push 0 for the operator and ask for him). You can also email him at dlibby@spectrumlabs.com.

Thanks for visiting.
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