>From Jones Beene * I can't see nickel sputtering making a significant difference in enrichment at all. Is there any real evidence? Jones, I think Thermophoresis and Soret effect may be enhanced due to trajectory motion along a single axis. I also suspect that the molten alloy in motion is still subject to dispersion forces that oppose the formation of Casimir geometry but may somehow contribute to enrichment - [snip] or electrophoresis and diffusiophoresis in colloidal suspensions,[/snip] Fran
Thermophoresis in colloidal suspensions R Piazza1 and A Parola2 http://iopscience.iop.org/0953-8984/20/15/153102/pdf/0953-8984_20_15_153102.pdf 1 Dipartimento di Chimica, Materiali e Ingegneria Chimica, Politecnico di Milano, 20133 Milano, Italy 2 Dipartimento di Fisica e Matematica, Universit`a dell'Insubria, 22100 Como, Italy E-mail: roberto.pia...@polimi.it and alberto.par...@mi.infm.it Received 19 December 2007, in final form 21 February 2008 Published 25 March 2008 Online at stacks.iop.org/JPhysCM/20/153102 Abstract Thermophoresis is particle motion induced by thermal gradients. Akin to other driven transport processes, such as the Soret effect in simple fluid mixtures, or electrophoresis and diffusiophoresis in colloidal suspensions, it is, both experimentally and theoretically, a challenging subject. Rather than being a comprehensive recollection, this review aims to be a critical re-examination of the experimental and theoretical tools used to investigate thermophoresis, and of some recent relevant results that may unravel novel aspects of colloid solvation forces. The perspectives of thermophoresis as a tool for particle manipulation in microfluidics are also emphasized. _____________________________________________ From: Jones Beene [mailto:jone...@pacbell.net] Sent: Monday, January 30, 2012 1:42 PM To: vortex-l@eskimo.com Subject: EXTERNAL: RE: [Vo]:Ni-64 enrichment 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.
