kindly help me to interpret that this data follows which type of isotherm. it looks abnormal or if anyone can explain lease provide references.
Thanks in advance
Is something leaking out from the sample? At least the adosrption at low pressures is negative. As Christian Weinberger said, increase mass, do proper degassing and check for leaks in the system. What is the unit for quantity adsorbed?
As both professor. have mentioned, i recommend you to degas your sample at high temperature. Usually high surface area samples with less mass in sample holder results in uplifting of samples during adsorption desoprtion cycle. Take more sample quantity and degas the sample for higher temperature 350 to 400 based on your sample thermal stability.
La pression appliquée à l’échantillon est grande, ce qui ne permet pas à la monochouche de se former correctement sur l’échantillon si les échantillons sont Micropores.
Si les échantillons contiennent des Macropores de plus de 50 nm, il s’agit d’un résultat attendu.
Mettre l'échantillon sous vide à 90°C pendant deux heures avec strating pressure 0.001 et Equilibration 30s
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