BET Analysis, as the p/p0 value increases, the adsorbed amount goes negative, especially after the value of 0.1. Why?

07 December 2022 1 7K Report

BET Analysis, as the p/p0 value increases, the adsorbed amount goes negative, especially after the value of 0.1. Why? Thanks.

Henrik Romar

Have seen this some times. There are some possible reasons, most important might be inproper degassing. Also leaks in the system could possibly make this, check the O-rings at the top of the tubes and replace them. Make longer degassing/use higher temeprature/use lower pressure or a combination of these.

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