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I am using a Micromeretics ASAP2020 machine. The sample is ~25mg of reduced graphene oxide based film.
The problem is I am getting adsorption isotherms showing negative volumes of adsorbate (N2) entering the tube as P/P0 increases.
The sample was degassed prior to testing at 250°C for 3 hours then backfilled with N2. As a side note, TGA says the sample retains >99% mass up to 400°C.
Any ideas kind people?
The problem is I am getting adsorption isotherms showing negative volumes of adsorbate (N2) entering the tube as P/P0 increases.
The sample was degassed prior to testing at 250°C for 3 hours then backfilled with N2. As a side note, TGA says the sample retains >99% mass up to 400°C.
Any ideas kind people?