What sort of experiments can be doen with Graphite ?

  1. What sort of experiments can be doen with Graphite ??

    I need experiments that can be done for the research of graphite.. GOt any ideas??
     
  2. jcsd
  3. Philip Wood

    Philip Wood 1,088
    Gold Member

    Re: What sort of experiments can be doen with Graphite ??

    Variation of resistance with temperature.

    Carbon microphone.

    Different resistances across different pairs of opposite faces in a graphite cube. [I've never tried this, and it might be difficult to do, owing to problems making contact in a standard and reproducible way with the faces. Area of contact (metal to graphite) and pressure applied would need to be the same.]
     
  4. Bobbywhy

    Bobbywhy 1,908
    Gold Member

    Re: What sort of experiments can be doen with Graphite ??

    th3whit3fang, Welcome to Physics Forums!

    If I had that assignment I would start with the Wikipedia page "Graphite" to stimulate ideas for experiments.

    http://en.wikipedia.org/wiki/Graphite

    Check the sections "Occurrence, Properties, Uses". Don’ t forget these final sections, they can lead to far more information and ideas for your project:

    "See also"
    "References"
    "Further reading"
    "External links"

    Cheers,
    Bobbywhy
     
  5. Re: What sort of experiments can be doen with Graphite ??

    Thanks for your advises !!!

    Can you explain how it could be done with graphite.. i searched for it and i got an experiment but it isn't so clear what was being done in the video..

    http://www.youtube.com/watch?v=BhDzyK3-RSU
     
    Last edited by a moderator: Jan 15, 2014
  6. Philip Wood

    Philip Wood 1,088
    Gold Member

    Re: What sort of experiments can be doen with Graphite ??

    One way to make a carbon microphone is to rest a piece of pencil 'lead' (that is graphite + a binding material) a few centimetres long on the edges of two razor blades. The set-up is [itex]\pi[/itex] shaped, with the razor blades forming the uprights, and the pencil 'lead' forming the bridge across the top. The 'terminals' of the microphone are the razor blades.

    Connect the microphone in series with a battery (6 V, perhaps) and a resistor (100 [itex]\Omega[/itex], perhaps. Connect the y-amplifier input terminals of an oscilloscope across the resistor. Speak loudly near the pencil lead and you should see a corresponding trace on the oscilloscope, when you've adjusted the time-base and the y-gain.

    It works - if it does work! - by the pressure variations in air due to the sound waves pushing the 'lead' more and less firmly on to the blades, changing the contact resistance between blades and lead. The series resistor completes a potential divider circuit.

    Until quite recently carbon microphones (using carbon granules) were the standard microphone in telephone handsets. The quality of reproduction was never good.
     
    Last edited: Feb 3, 2013
  7. Re: What sort of experiments can be doen with Graphite ??

    Thanks man !!!
     
  8. Philip Wood

    Philip Wood 1,088
    Gold Member

    Re: What sort of experiments can be doen with Graphite ??

    Please post if you try it.
     
  9. Re: What sort of experiments can be doen with Graphite ??

    How about diamagnetic levitation?
     
    Last edited by a moderator: Sep 25, 2014
  10. Re: What sort of experiments can be doen with Graphite ??

    They are different but does carbon fibre count as graphite in this context?
     
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