Hello,
Just wondering why this type of BET isotherm appears? Is it normal? If it is abnormal, what could be the cause and how can I modify it？
Thanks a lot
Regards
-Check whether the instrument is working properly. You may test a previously analysed material.
- Make sure the sample is physically stable and doesn't collapse during the analysis.
- Make sure that the sample doesn't sucked by evacuation.
Hello, The an unfinished isotherm happens, but in this case the desorption branch below the adsorption and the decrease of the amount at p/p0 = 0.5 is strange. During my many years of research, I only dealt with such a situation once. I repeated the tests which did not confirm them. I suggest re-measuring to eliminate the leak.
Dear Zongyuan Zhu ,
You have to check the used instruments. If the instrument is provided correct analysis.
Adsorption desorption of N2 gas onto the investigated materials in the above-mentioned Fig. . This curves revealed that isotherm type IV according to the IUPAC isotherm. I wish this answer will be useful for you.
You better check your Degas conditions. It seems that you have a problem with your desorption curve. Have you ever done a TGA test before you decide on your Degas conditions? Or are you sure that your sample is dry? If you are sure of all these, you should talk with the service provider.
- I just got some people inboxed me about this question. I repeat the experiment and did not get this type of isotherm. I think it is because the BET experiment procedure has some mistakes, e.g. gas leaking.
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