Sintered materials tend to have much larger gaps than their constituent particles.
I am trying to make cavities, most of which are less 20 nm and many less than 10nm and some all the way down to the size of a single atom removed. Plus I want a relatively thick cavity wall--as much as is practical. For LPD, I only need to do this on the surface of one side. For the Relativistic-Cavity thing, we should probably find or make a suitable alloy, freeze it with liquid Nitrogen, crush and grind it into a fine powder then treat it with the leaching agent so there will be a large number of cavities available to soak up the Kr 81 gas.--unless someone has a better way to make nano-particles out of an alloyed metal. (I am actually leary about using Kr 85, just in case this process catalyzes nuclear reactions better than we are expecting.) Scott From: [email protected] To: [email protected] Subject: RE: [Vo]:Need to find Raney-Type Alloy w/low melt-point. Date: Mon, 15 Feb 2010 11:55:21 -0800 > To Group, I need to find two metals to make a Raney-Type porous metal sponge. > Usually this is done with Ni & Al, but they have very high melting points as > do all members of the Ni-Pd group. Why not start with nano-powder – compress it mildly and heat to the level of diffusion bonding, and thereby forget about leaching? When Raney nickel was invented, nanoparticles were unknown as a starting point. Thus the need to leach. There are number of sources for nanoparticles, or you can buy the “black” (micron range) and grind it down by hand. http://www.americanelements.co.uk/pdnp.html I am told by a current practitioner (of Arata/Kitamura type experiments), that mortar-and-pestle hand grinding gives better results in the low nano size range (near 2 nm) – and at far less cost (use a fume hood as anything “nano” can be toxic, like asbestos). Jones _________________________________________________________________ Hotmail: Trusted email with Microsoft’s powerful SPAM protection. http://clk.atdmt.com/GBL/go/201469226/direct/01/
