Print Email Facebook Twitter Metal organic framework synthesis in the presence of surfactants: Towards hierarchical MOFs? Title Metal organic framework synthesis in the presence of surfactants: Towards hierarchical MOFs? Author Seoane, B. Dikhtiarenko, A. Mayoral, A. Tellez, C. Coronas, J. Kapteijn, F. Gascon, J. Faculty Applied Sciences Department Chenical Engineering Date 2015-01-07 Abstract The effect of synthesis pH and H2O/EtOH molar ratio on the textural properties of different aluminium trimesate metal organic frameworks (MOFs) prepared in the presence of the well-known cationic surfactant cetyltrimethylammonium bromide (CTAB) at 120 °C was studied with the purpose of obtaining a MOF with hierarchical pore structure. Depending on the pH and the solvent used, different topologies were obtained (namely, MIL-96, MIL-100 and MIL-110). On the one hand, MIL-110 was obtained at lower temperatures than those commonly reported in the literature and without additives to control the pH; on the other hand, MIL-100 with crystallite sizes as small as 30 ± 10 nm could be easily synthesized in a mixture of H2O and EtOH with a H2O/EtOH molar ratio of 3.4 at pH 2.6 in the presence of CTAB. The resulting material displays a hierarchical porosity that combines the microporosity from the MOF and the non-ordered mesopores defined in between the MOF nanoparticles. Interestingly, the maximum of the pore size distribution could be varied between 3 and 33 nm. Finally, at pH 2.5 and using water as a solvent, platelets of MIL-96, a morphology never observed before for this MOF, were synthesized with a (001) preferential crystal orientation, the (001) plane running parallel to the bipyramidal cages of the MIL-96 topology. Subject Gold for GoldOpen Access To reference this document use: http://resolver.tudelft.nl/uuid:81901c4a-4481-47e9-91ea-118b1df31bd0 DOI https://doi.org/10.1039/C4CE02324B Publisher RSC Publishing ISSN 1466-8033 Source CrystEngComm, 2015,17, 1693-1700 Part of collection Institutional Repository Document type journal article Rights (c) 2015 RSC Files PDF c4ce02324b.pdf 943.91 KB Close viewer /islandora/object/uuid:81901c4a-4481-47e9-91ea-118b1df31bd0/datastream/OBJ/view