Frank Key wrote: > Marhall wrote: > > > A 2 nm silver particle can contain up to about 8,000 atoms of silver (if it > > is cubic) and somewhat less if it is spherical. I would assume you could > > make an educated guess that 350,000 would remove particles > > down to 8,000/3.5 = 2285 atoms. That works out to be particles of about > > 1.3 nm cubic. (This works out for spherical as well, since pi and 4/3 drop > > out of the equation for the ratio). > > > > So I am still not convinced that the centrifuge will remove small particles > > of .2 to 1 nm for example. > > You may be correct, but what difference does it make? What magnitude of error > would be introduced? > > We know that a 0.2 nm particles cannot exist because a single silver atom is > 0.288 nm in diameter.
Where did you get that number from? I show it at .144 nm for an atom of silver and .126 nm for a +1 ion of silver. (General Chemistry, Ninth edition, Holtzclaw, Robinson and Odom, 1991 DC Heath and Co.) We also know that the van der Waals' force exceeds 100,000 G forces for particles that small, and there is no counter force of repulsion that is strong enough to keep such small particles from aggregating to form larger particles. That almost pales in comprison to the 250,000 G you are applying already. So we have 450,000 G's. I will have to pull out my electronic texts to compute the repulsion between particles if they have an OH absorbed onto them, and see how that compares with the G force for a couple of atoms. I suspect that the electrostatic repulsion will be higher though, a couple of silver atoms are pretty light. Marshall -- The silver-list is a moderated forum for discussion of colloidal silver. To join or quit silver-list or silver-digest send an e-mail message to: silver-list-requ...@eskimo.com -or- silver-digest-requ...@eskimo.com with the word subscribe or unsubscribe in the SUBJECT line. To post, address your message to: silver-list@eskimo.com Silver-list archive: http://escribe.com/health/thesilverlist/index.html List maintainer: Mike Devour <mdev...@eskimo.com>
