1. Can I measure the BET if my sample is not in powder form?
2. If the sample must be in powder form, is the measured specific surface area is same as the original sample (in foam form)?
1. Yes, as long as your sample fits inside the test chamber of the BET measuring instrument.
2. No. In general, the specific surface area increases with decreasing particle size. Ideally, you should keep the geometry of your test sample as close as possible to that of its final application. Slicing the foam into smaller pieces may be a better alternative than grinding it to a powder form.
Carlos A. Leon Y Leon thank you for your response. I'll take note on that.
Is there any calculation to get the specific surface area after characterize using BET? Can you suggest any related paper for BET that I can refer?
IUPAC recommendations for the calculation of specific surface area by the BET method can be found in the following reference: Thommes et al., Physisorption of gases, with special reference to the evaluation of surface area and pore size distribution (IUPAC Technical Report), Pure Appl. Chem. 87 (2015) 1051-1069:
Article Physisorption of gases, with special reference to the evalua...
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