On close examination you'll see that particle clouds form at both
electrodes under certain conditions and both form a downwards arc.
One side will be a white cloud, the other a golden cloud.....with nothing
visible in between. [Deducing by default...Silver ions ]
Current density being high favors the formation of that golden cloud and
I've never made CS where that cloud became visible that didn't turn out
yellow.
The golden side leaves a black deposit [silver oxide] and the white side
leaves a white deposit [silver hydroxide] as the arc contacts the bottom
surface.
If that "nothing" comes in contact with glass, it will plate out pure
metallic silver like a very hard to remove mirror.
The only way to make "silver" out of ions is to pick up an electron, but
"electrons" don't survive well in water, so, they must be coming from
contact with the glass itself.
Glass can act like a capacitor and with the metallic impurities used in
making glass what it is, it's probably a poor solar cell as well, picking
up cosmic rays and such from the environment. Capacitors work by
collecting excess electrons on one side of a surface.
Harvard experiments mention glass surfaces as a crystal nucleation site.
Ode
At 08:24 AM 7/25/2007 -0500, you wrote:
Ideally, it is probably better to not have the silver touch the glass
since you may get more plating or something, but the instructions were
meant to minimize the less significant details in order to make a simple
set of instructions. I never actually had a setup where the electrodes
touched the glass sides, but I know if the wires are too close to the
bottom, with no stirring, you get residues and sometimes plating on the
bottom of the glass which need to be removed by scrubbing, or with
Hydrogen Peroxide.
I think Ode sent a post quite a while back about the benefits of
stirring that mentions something about this, maybe he would chime in.
Something about Nernst diffusion layers and scavenging oxygen from the
glass, etc, but, you do not need worry about this or even about stirring
in order to make a simple CS that you can use. As you get familiar with
the process you may want to get more elaborate.
You might try some sort of canning jar where the opening is of smaller
diameter than the main container, so you would not have this problem.
If there is no water where the electrodes touch the glass, there
certainly wouldn't be any problem.
Dan
-----Original Message-----
From: Kirsteen Wright [mailto:[email protected]]
Sent: Wednesday, July 25, 2007 3:39 AM
To: [email protected]
Subject: Re: CS>Simple setup and (hopefully) clear instructions for
making Colloidal Silver
On 7/25/07, Dan Nave <[email protected]> wrote:
>
> 4. Hang the two silver wires in the glass so they hang from the edge
> of the glass. The wires should be on opposite sides of the glass.
Is it ok to have the wires touching the glass? I don't know why, but I
thought they shouldn't touch it and I've been going into contortions to
keep them away from the side. This would be much easier
Kirsteen
--
And, while it was regarded as pretty good evidence of criminality to be
living in a slum, for some reason owning a whole street of them merely
got you invited to the very best social occasions.
-- (Terry Pratchett, Feet of Clay)
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