Ode Coyote wrote: > At last, someone with a clue came along and put it all into one string on > the same page. > ..now to go fish my boot out of the mud hole I was standing in. :-) > > Together with previous post, it expains why only the fresh CS that hasn't > formed all its particles yet reacts violently with the peroxide. > The water gets very milky looking with a quick release of oxygen making an > unstable emulsion that outgasses and clears up some as only the silver > particles are left suspended and ionic conductivity goes down due to there > being fewer ions in solution. > > Now if you could touch on what's going on when peroxide clears the color > out of CS that already formed its particles, I think we'd have a fairly > complete story. [I believe the particles get broken up...just not sure how]
I believe that initially they form silver oxide Ag2O, which will dissolve up to a limit of 13 ppm (that is 13 ppm of silver oxide, not silver metal. About 12 ppm of actual silver by weight). If you exceed this then you will get a silver oxide precipitate that will make it milky, and will precipitate out as a light brown or tan powder after a few hours. Then over time, the H2O2 reacts with the Ag2O and forms 2Ag, pairs of metallic atoms, a colloid again, which is why you end up with a faint TE. However I see no reason why the 2Ag will not convert back to silver oxide again (unless it has low affinity for the H2O2 breaking down), and so forth as long as there is H2O2 available, so the ratio between the two will likely be set by the conversion rates of the two reactions. But the bottom line is that large particles end up as small Ag2 particles, the smallest particle possible that is not an ion. That is perhaps the reason why H2O2 is reported to enhance EIS effedtiveness. The milkiness you see may well be the initial production of Ag2O which exceeds 12 ppm of silver from the rapid reaction of the silver ions with the H2O2. Then at a slightly slower rate, the Ag2O converts to pairs of silver atoms, so that which precipitated can then dissolve back into solution before having time to precipitate. Or as you say it could be released oxygen. If you watch the milkiness and see if it precipitates (excessive silver oxide, or any amount of silver peroxide AgO), simply dissipates (silver oxide dissolving back into solution as that which is in solution forms silver atom pairs), or rises (released oxygen), it should be easy to tell which it is. Of coure it could also be a combination of silver oxide and oxygen bubbles as well could could make it more difficult to observe what is happening. Marshall > > > So far as making huge shiny metalflakes when using peroxide during the > 'process'... I think maybe I won't do that anymore. > Why they turned into black oxide balls after sitting on a South facing > windowsill for a year...could be that UV light for a whole lot of time. > [right?] > > Ode > > >The effect of hydrogen peroxide is quite complicated, I think all the > following > >occur, at different rates: > > > >2(Ag+ OH-) + H2O2 -> Ag2O + H2O2 + H2O IE. H2O2 is a catalyst and > unchanged by > >this since the two OH radicals combine and replace the original molecule > >Ag + H2O2 -> Ag2O + H2O Metal converts to silver oxide > >Ag2O + H2O2 -> 2Ag + H2O + O2 silver oxide converts to metalic pairs of > silver > >atoms. > > > >And there could be others that involve AgO a less abundant silver oxide as > >well. > > > >Marshall > > > >> > >> Ode > >> > >> -- > >> The Silver List is a moderated forum for discussing Colloidal Silver. > >> > >> Instructions for unsubscribing are posted at: http://silverlist.org > >> > >> To post, address your message to: [email protected] > >> Silver List archive: http://escribe.com/health/thesilverlist/index.html > >> > >> Address Off-Topic messages to: [email protected] > >> OT Archive: http://escribe.com/health/silverofftopiclist/index.html > >> > >> List maintainer: Mike Devour <[email protected]> > > > > > >
