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Is graphene supposed to have high thermal conductivity of 5300 W/mK, but why does many commercial graphene thermal dissipation inks claim that the thermal conductivity is 5 W/mK or even lower?

The thermal conductivity of 5300 W/mK is the theoretical value for single-layer and free standing graphene sheet. Once the graphene is attached on other substance, the energy/heat transportation amongst graphene would be dampened.
Additionally, the commercial graphene thermal dissipation inks comprise more than graphene powder. Resin, used as matrix and adhesive, is a low thermal conductivity material. Therefore, the overall efficiency would NOT reach the ideal thermal conductivity of 5300 W/mK.

How does Enerage measure the concentration of graphene organic suspension?

The concentration is measured by the ultraviolet/visible spectroscopy. The value of solid content is derived from comparing the absorbency of graphene organic suspension S-ON20 to the absorbency of sample which the solid content is known.

What is the solid content of graphene organic suspension?

The solid content of graphene organic suspension S-ON20 is around 200ppm, which is 40 mg graphene suspended in 200ml solvent.

Which kind of solvent can be homogeneously mixed with graphene organic suspension S-ON20?

N-Methyl-2-Pyrrolidone (NMP) is used as solvent to produce graphene organic suspension S-ON20. NMP is miscible in water, ethanol, acetone, ethyl acetate, chloroform, benzene etc.

What temperature should be reached to remove the solvent in graphene organic suspension S-ON20?

N-Methyl-2-Pyrrolidone (NMP) is used as solvent to produce graphene organic suspension S-ON20. The boiling temperature of NMP is 203℃. The appropriate heating temperature is according to the substrate of cast film and the mixed materials. Based on our experience, most NMP is able to be removed by soft-baking at 100℃ for 30 minutes for spin coated film.

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