How much sample is required for BET measurement?
Please tell me the minimum quantity that we must use.
A rule is to have at least of 1m^2 in your cell if you want to have both specific area and pore size distribution. So it's matter of surface area and not mass. You can find from tables different specific areas for silica and then try different amounts to see what's the minimum for your sample. When using little amount better use the smallest available cell with a rod inside to minimize the dead volume.
As Mr. Pappas said, you must have a minimum specific area. I recommend you to take a look at your instrument manual to check basic informations on that. Anyway, if you are performing full isotherm measurements (area + pore size), anything between 10 and 15 square meters should work fine. If You know the approximate size and shape of your nanoparticles you may roughly estimate the mass you should use.
For the Quantachrome NOVA 2200e sorption analyzer, the sample to be analyzed must be sufficient for 2–50 m2 total area.
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