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  •  Silver reacts to air. (11+ / 0-)

    That's why you have to constantly polish silverware.

    Aluminum can corrode under some conditions but is far more stable.  Just look at a soda can that's been left out for years.

    GOP Motto: The rich don't have nearly enough and the poor have way too much.

    by DawnG on Fri Dec 07, 2012 at 07:00:10 AM PST

    [ Parent ]

    •  But it is a noble metal. (23+ / 0-)

      Generally, silver oxidizes to several molecular layers in the presence of airborne sulfur as a catalyst but is not particularly prone to corrosion (in fact, it is insoluble in aqua regia which cannot be said for Au or Pt) and in the galvanic series defined by immersion in the saline solutions used for standard corrosion tests it is just one step below gold in corrosion resistance.

      There are several definitions of nobility and the common grouping is noted in my response to the original question, but if we use the most strict and basic definition generally accepted in physics (verses, say, electrochemistry) it is that the d-band is filled, which restricts the list to only copper, silver and gold.

      By the way, silver is not the only noble metal that tarnishes readily, Pt and Pd also do although it is less visually apparent since the oxides are limited a mono layer so essentially invisible to the naked eye.

      What about my Daughter's future?

      by koNko on Fri Dec 07, 2012 at 08:17:41 AM PST

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      •  Excellent explanation! (4+ / 0-)

        I didn't know that Pt would also oxidise.  But I guess the fact that the oxidation is limited to a monolayer will let me sleep at night. :-)

        -7.38, -5.38 (that's a surprise)

        I lie to myself because I'm the only one who continues to believe me. - Vermin

        by 84thProblem on Fri Dec 07, 2012 at 09:59:35 AM PST

        [ Parent ]

      •  Yes but... (0+ / 0-)

        ...does the loss of reflectivity affect its ability to function in the nano mesh?

        GOP Motto: The rich don't have nearly enough and the poor have way too much.

        by DawnG on Fri Dec 07, 2012 at 11:59:07 AM PST

        [ Parent ]

      •  From black and white photography (2+ / 0-)
        Recommended by:
        FarWestGirl, ozsea1

        you can use either selenium or gold chloride to permanently tone photos. Silver and selenium create a non-reactive (inert for all purposes) compound for conservation purposes...properly stored b&w photos will last as long as their paper base exists, about 3,000 years in the best case scenario.

        Although I never used gold chloride, allegedly it has similar properties. However, i have no idea if these are workable with regards to the solar cell. The reaction time to create these are only a few minutes in the immersed liquid, so they could be bathed in process relatively easily.


        The truth is we are tortured by the truth.

        by walkshills on Fri Dec 07, 2012 at 12:43:31 PM PST

        [ Parent ]

    •  silver (3+ / 0-)
      Recommended by:
      FarWestGirl, kurt, indie17

      oxidizes but fortunately the surface oxidation product Ag2O is still conductive while aluminum oxide is an insulator. Ag is used as the top contact of every Si solar panel made for a reason.

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