Hello,
I saw there is two different morphologies in SEM images of PCN-224, including cubic and spherical. I would appreciate if someone could explain this issue to me.
Dear Naeimeh,
Please check other analyses of these two MOFs such as FT-IR, ...! Are there any differences between them? I think, there is a possibility to have polymorphs in these MOFs.
Good luck
Dear Naeimeh Hassanzadeh Goji, It is not sure if the synthesis conditions are identical for both morphologies. Normally, MOFS morphology depends on the solvent and the growth rate of crystal facets, which is governed by the crystal structure, defects, and crystallization conditions. For instance, ZIF-67 shows 3D dodecahedral morphology in methanol while 2D (leaf-like morphology) in water. Best
Dear Naeimeh,
It is quite normal for the same MOF to have different morphologies and the morphology of the MOF is related to the synthesis conditions such as surfactant, solvent (both solvent type and solvent ratio), reactant ratio (ratio of metal to ligand), temperature, pH, reaction time etc. These conditions affect the arrangement of the crystals and the exposed crystal facets, which are related to the energies of different facets. However, it is pretty difficult to give a general answer to this question. You can try searching the relevant reviews on controlling morphology and you will get your answer.
Some related articles:
https://doi.org/10.1002/advs.202001980
Article Metal–Organic Framework Nanoparticles
All the best :)
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