From: Roarty, Francis X * There was some conjecture that even sputtering can accomplish a crude form of enrichment. I can't see nickel sputtering making a significant difference in enrichment at all. Is there any real evidence? Jones, The discussion was regarding the Soret effect : http://www.mail-archive.com/vortex-l@eskimo.com/msg47143.html
OK- but thermophoresis involves massive amounts of time with materials held at high and nearly molten temperature, in order to effect minuscule changes. With sputtering, the high temperature is over in millisecond. There is simply not enough time to significantly enrich nickel, IMO.
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