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Posted in response to synthetic opal synthesis from mike on July 19, 2007 at 15:19:31:

Re: synthetic opal synthesis

Hi Mike,

I happened to be passing through and saw a familiar topic! I did indeed synthesize quite a bit of material using a Stober synthesis. Got to the point of actually making some opal about 3 years ago and then had to divert my time to other research. If all you want is a jar of microspheres to show some color, you might buy some prepared material. Monodisperse spheres are (were) available for about $3-400 per kilogram.

BTW, to get the really spectacular color patches, you have to "recrystalize" the opal by supramolecular crystallization. That is the stage I got stuck on and simply have never had time to go back to that work. Unfortunately, they pay me to teach Earth Science, not make opal!

Henry

From Henry Barwood - July 19, 2007 at 20:26:27

Message: 64645

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Bob Keller