On Sun, 16 Mar 2008, William "Chops" Westfield wrote:

> 
> On Mar 16, 2008, at 3:41 PM, Jake Anderson wrote:
> 
> > I'm interested as silica gel is the feed stock for aerogel otherwise
> > I'll have to try the agar based version.
> 
> You need to start with soluble silica forms to get to aerogels, as  
> far as I know.  "Silica gel" (or even "fumed silica") is much too far  
> along the way to a traditional solid.  Usually tetraethoxysilane,  
> apparently (see <http://www.chemicalforums.com/index.php? 
> op=Articles;article=21>)
> What is this "agar based version" you speak of?
> 

for water soluble, lookup "water glass"

Regards
Sergio
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