Hi,
How the pore size of Mesoporous Silica Nanoparticles can be determined? when you characterize it through the Nitrogen sorption technique by BET and BJH, which gives surface area, pore volume and pore radius.
Please give me detailed description for it.
Thank you so much
Dear Bhaadar,
You can obtain some images using electron microscopy techniques (SEM or TEM) and then the pore size of your material can be determined using some software to measure the pore size or diameter (Image J software, for example). Besides, images obtained by AFM can be helpful too. Of course, you should choose the technique considering the aspects of your sample as well as other analytical aspects as sample preparation.
Regards, André.
Nitrogen sorption technique by BET and BJH is already very well documented in google search
Raheem Bahadar You answered your own question. Use BJH (or DFT) pore size calculations from gas sorption isotherms (usually N2 at 77K) for these materials. Gas sorption covers the entire mesopore range (2-50nm according to IUPAC classification). In fact, the method can go as large as 400-500nm. But if you have pores larger than that (well into the macropore range) you should consider mercury intrusion porosimetry.
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