>> 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?
>
> BillW
>   

http://en.wikipedia.org/wiki/SEAgel

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