> > Hi Marshall, > > My take on this is that the larger particles found in *some* LVDC > > systems come from the accumulation of metallic silver at the cathode > > finding its way into the solution. It is my view that the silver > > leaves the anode as single ions in all systems, and the process of > > aggregation begins after the power is withdrawn. > > > > Ivan. > > That is certainly possible. What would we expect if this were the case > then? The concentration near the anode would be quite high, which would > cause aggregation until the ions diffused out far enougth to lower the > concentration.
Marshall, yes the concentration would be high at the anode as you say, but the behaviour of the ions would be described as electrophoresis rather than diffusion. That is the particles would be travelling under the influence of the voltage gradient, in the same general direction at the same speed, and so the collisions that could result in aggrigation would be minimal. >The diffusion rate should be proportional to voltage, and > the density proportional to current. Thus I would expect particle size to > be smaller with higher voltages (which is is with HVAC), and larger with > higher currents, which others have reported, and I have seen in HVAC > systems, but feel is due to the additional temperature rise with higher > currents since I can reduce this effect with cooling. My own experiments suggest that cold water results in a clear solution, but then I have also found that an aggressive current limit nets a similar result in hot water. The colder the water the slower the particles travel I guess. > I think the jury is out on this, but it is certainly a possibility. Indeed. > Marshall > Ivan > 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: > [email protected] -or- [email protected] > with the word subscribe or unsubscribe in the SUBJECT line. > > To post, address your message to: [email protected] > Silver-list archive: http://escribe.com/health/thesilverlist/index.html > List maintainer: Mike Devour <[email protected]> >
