If we change different type of materials which are in the range of type 4 isotherm and they have similar pore size do we still need to tweak the dosing pressure for both the materials? Even if the adsorbent gas used is nitrogen for both the cases?
What I am thinking is since both the materials follow Type 4 isotherm and are mesoporous with N2 as their adsorbate then shouldn't the dosing pressure for both of them remain the same for a single point BET test. If not then can you please let me know the other variables that I might have missed in the adsorbate which would force us to change the dosing pressure.
Most standard gas adsorption apparatus should adjust the dosing automatically. It is actually difficult to evaluate porous solid characteristics through a single point too.
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