I have samples with micropores and I am using BJH polt but it didn't show pores diameter smaller than 2.43nm but I believe the sample has more pores smaller than 2.43nm and also adsorption-desorption isotherm curve showed so, as try I checked in MP plot and it shows 0.7nm dia. but I don't how reliable it is and how does it work, please suggest to me.
Thank you.
When the C parameter of the BET model is very high, you likely have micropores. The t-plot or alfa S plot are simple methods to discriminate between micro and meso-pores.
Hysteresis in the isotherms due to micropores should occur below x=0.4 and in general this is difficult to detect. Hysteresis beyond x=0.4 is due to mesopores (or intra-particle pores).
The BJH method is a simplistic model to describe mesopore filling, and gives not a reliable estimate of micropores, because the standard isotherm for the non-porous surface is based on isotherm data for higher relative pressures than where micropores fill.
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