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I am studying the graphene as reinforcement phase of electrical conductive polymer composite. But I have some problems about measuring electrical conductivity of graphite powders.

I have read some articles which related to electrical conductivity of graphite and reduced graphite oxide. In these, they use GEM equation (more exactly is derivative GEM equation), as following:

http://img139.imageshack.us/img139/3844/52679070jt5.jpg [Broken]

In this formula, two parameters [tex]\Phi[/tex] and [tex]\Phi[/tex]c relate to the apparent powder density before compression. I don't know how to measure the apparent powder density ??? Can you help me to resolve it ?

In summary, I want to measure electrical conductivity of powders, and I just know one method above. If anyone has studied it, please support me some other methods.

Thanks in advance.

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# How to measure electrical conductivity ?

Can you offer guidance or do you also need help?

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