David AuBuchon wrote:
I was under the impression that the particles in EIS are basically
metallic silver that was "stripped" off of the anode along with silver
ions coming off. If I understand correctly, Mesosilver particles are
metallic silver.
No, the only thing that comes off the anode are silver and hydrogen
ions. They collide and become particles near the anode where the ppm is
too high for solubility.
I read elsewhere that while silver ions are coming off the anode,
hydroxide ions are also coming off of the cathode.
OK.
Then the two combine into silverhydroxide.
That is pretty well correct for the ionic part.
Then molecules of silverhydroxide agglomerate to form particles. Is
this true?
Well, the sequence is questionable. In the layer near the anode, there
is a lacking of hydroxide ions, and THAT is what I believe causes the
aggregation of silver into particles. Once out into the solution where
they can pair up, the conversion stops or at least slows considerably.
I believe that over the following 48 hours, excess silver hydroxide is
converted to silver oxide, and that silver oxide then aggregates to
continue with the conversion over time for higher ppm EIS. That is why
if you add H2O2 too soon, you get a silver oxide precipitate, it exceeds
saturation and there is insufficient time for any of it to convert to
colloidal silver.
If so, where is the hydroxide coming from?
Water, which is Hydrogen hydroxide.
Or is there only metallic particles? Or are there both metallic
particles as well as silverhydroxide particles?
There is a combination of water, silver particles, silver hydroxide, and
silver oxide which silver hydroxide spontaneously changes into over
time. When in solution there are no silver hydroxide particles in the
classical sense, there are really disassociated silver ions and
hydroxide ions that balance each other's charge.
Marshall
Thanks,
~David A.
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