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Changing the Resistivity of Bakelite

  1. Oct 30, 2008 #1
    Hey PFers,

    So basically, we have these plates of bakelite that have on the order of 10^10 Ohms surface resistivity, but it is not uniform enough. Part of the reason may be that although these sheets may have some non-trivial non-uniform structure at a small enough scale.

    These sheets of bakelite are used in particle detectors that require a rather large uniform surface charge on these sheets, and the ability to quickly replenish charge when charge is lost on the surface due to electron "avalanches" that occur in close proximity to them via high potential connections.

    So far, linseed oil has been tested and it does a good job of making the surface more uniform and also helps with the rate of charge restoration. One thing that would be great though would be to be able to change the resistivity of this bakelite in a controlled manner. One such possibility is to put a net charge on some metallic salts, and then drop them on the linseed oil coating while it dries on the bakelite, thus spreading it out in a uniform manner.

    So you experts on materials and such tell me, are there other methods to:

    1. Make a more uniform coating on the bakelite with maybe another coating than linseed oil. (tung oil, etc)
    2. Some way to control the resistivity of the surface of the baklite in a uniform manner.

    Thanks for any ideas!

    This is NOT for any commercial interests but purely for research.
     
  2. jcsd
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