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To: Scumbria who wrote (21399)	12/3/2000 12:01:06 PM
From: Björn	Respond to of 275872

Oh, really? I was busy picking my nose during those classes. (: barjo

To: Scumbria who wrote (21399)	12/3/2000 12:32:35 PM
From: RDM	Read Replies (1) \| Respond to of 275872

"This is impossible. My high school chemistry teacher taught me that isotopes were chemically identical. ;^)" Isotopically pure carbon(diamond) and silicon crystals do have different thermal conductivities than their impure counterparts. The phenomena varies significantly over temperature as well. You high school teacher did not mean to include this phenomena in his isotopes chemical properties scope or he was wrong if he did. There is some controversy over what the mechanisms are creating the phenomena. Much of the early work was done at Princeton and the phenomena has been confirmed in many other labratories. All of this work has been with the last 20 years.

To: Scumbria who wrote (21399)	12/3/2000 1:31:24 PM
From: Daniel Schuh	Read Replies (1) \| Respond to of 275872

Scumbria, on the one hand, it was high school chemistry, but on the other hand, it was high school chemistry at Los Alamos. You'd figure that they'd be careful about saying stuff like that there, if nowhere else. A quick web search didn't turn up a suitable overview, so I resorted to my, er, old Org text. Isotope effects Different isotopes of the same element have, by definition, the same electronic configuration, and hence similar chemical properties. . . . Yet different isotopes have, also by definition, different masses, and because of this their chemical properties are not identical; the same reactions can occur but at somewhat different rates. A difference in rate (or position of equilibrium) due to a difference in the isotope present in the reaction system is called an isotope effect That from Morrison and Boyd, Organic Chemistry, let's just say a vintage edition and leave it at that. That particular discussion was in the context of reaction kinetics, but thermal effects are, um, somewhat related in physical mechanisms. The thing I wonder about is producing pure Si28 economically. Si28 is 92% natural abundance, the rest is mostly Si29. An easier separation than U238/U235, but still a bit tricky. Isonics seems to be counting on ex-Soviet facilities, which might be cheap, but reliability questions come to mind. Cheers, Dan.

To: Scumbria who wrote (21399)	12/3/2000 10:06:43 PM
From: Bill Jackson	Read Replies (1) \| Respond to of 275872

Scumbria, The gross chemical properties are the same, however the atoms differ just a little bit in mass. This means they will have different properties, esp to those that want those atoms to move around a little bit or ring as it were. On the web site for this company they mention phonons. It seems these are sound energy carriers and if they have a perfect wave guide they can tunnel heat along in a more rapid way. mix the isotopes and you get some kind of discord in the song of the spheres and phonon heat condution falls off. I would buy stock in that company. they have a basic patent that works and all will have to beat path to door. they will get a fee from every one that makes high heat parts. Yes, buy their stock now Subject 18941 They are takeover bait. bill