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Posted in response to Re: Re: Re: Re: synthetic opal synthesis from Mike on July 22, 2007 at 16:38:52:

Re: Re: Re: Re: Re: synthetic opal synthesis

Mike,

It is not too difficult to obtain the chemicals. For instance, concrete waterproofing is mostly tetraethyl orthosilicate (TEOS). You can purchase it in a very pure grade from a chemical supplier. Methanol is used in high octane racing formulations and you can (could) get a 5 gallon container shipped for a reasonable cost. Methanol will work as well as ethanol for Stober synthesis. Ammonium hydroxide is a bit harder to get, but there are two amateur sources: Household ammonia and anhydrous ammonia (befriend a farmer!). The formulas for Stober synthesis are widely published on the internet (or you can look up the original paper at a library).

Here is the biggest problem you may face. If you order Methanol and go looking for anhydrous ammonia, someone from the DEA is going to check and see if you are running a meth lab! The combination fo the two may trigger a carnivore notation to HS. Better to buy some household ammonia and distill off the NH3 to make your own ammonium hydroxide.

Hope this will point you in the right direction.

Henry

From Henry Barwood - July 22, 2007 at 19:32:13

Message: 64673

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