ionic/colloidal silver cell
My wife recently had a tooth ache, local dentist x-ray shows partial root decay with removal of tooth recommended,
she wants to see her own dentist (10,000 km away) so this is short term maintenance,
influenced by my present dabblings in silver chemistry I thought an ionic/colloidal silver mouth rinse may help
so I did some research and lashed up a 'generator'
4x 18650 Lithium cell in series, 57 uA (measured) constant current source
2x 99.9% (advertised) purity 1.5 mm dia silver wire, c120 mm in contact with water
2x pure (eBay Russian) ptfe rod,wire holder/separator rods, 40 mm wire separation.
250 ml distilled water in a 250 ml dropper funnel and 'dosage' measuring cylinder.
Here are my calculations that I would appreciate someone checking for me
just to enhance my safety,
Assumptions;
A) most of the silver leaving the positive wire ends up in the water, not plated onto the negative wire
B) whether ionic or colloidal, one electron flows per silver atom dissolved/suspended
1) Current density, lower for small colloidal particle size (if any)
area= pi.dia.len = pi x 1.5 x 120 = 565.5 mm2 = 5.65 cm2
current density = 57 uA / 5.65 cm2 = approx. 10 uA/cm2 = my target.
2) ppm. by weight target = 15 ppm
250 ml x 15 ppm = 0.00375 g = .00375 / 107.86 (atomic mass) = 34.76 umole
34.76 x 10^-6 x 96 485.3365 (Faraday constant) = 3.35 A.s
3.35 A.s / 57 uA = 58 847 seconds = 16 hr. 20 min. approx.
I started this 'run' to get the above photograph, so replies more than 15 hours from now will not really help 
P.S. this is the third run.
side note: "glass-distilled then polished" water has a very high electrical resistance, but at c14 V in this set up
the resistance plumets within seconds, too fast for me and my meter, maybe I'll data-log or 'scope it next time?
For initial testing I used 30 V dc ... a 9 V battery would work, just a neglibly longer time to get to constant current operation.
P.P.S. in theory hydrogen gas slowly bubbles from the negative wire,
observing this set up intermittently over the runs, it appears as if
hydrogen is (hydronium ions?) dissolved in the water and bubbles appear on any surface, even the ptfe.
the negative wire, being the closest nucleation surface to the concentrated ions makes the most bubbles?
Probably old news but it is a new way of thinking about it to me.
[Edited on 11-4-2015 by Sulaiman]
[Edited on 11-4-2015 by Sulaiman]
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