Ide, Matthias

Van Der Voort, Pascal

Vercaemst, Carl

English

Ghent University Academic Bibliography

Hierachical and Bimodal Ethenylene PMO Materials Matthias Ide, Carl Vercaemst, Pascal Van Der Voort Department of Inorganic and Physical Chemistry, COMOC (Centre for Ordered Materials, Organometallics and Catalysis), University of Ghent, Krijgslaan 281-S3, 9000 Ghent, Belgium.  This research presents ethenylene bridged PMO materials designed from ordering within the pore wall up to controlling the external morphology of the actual particles.   First the pure E isomere of the ethenylene bridged silica precursor was synthesized using a Grubbs first generation catalyst. Because of this stereo-isomerical pure precursor actual ordering within the pore walls was observed. [1]  On the next level the percentage of E isomer influences the pore ordering from perfectly hexagonal to completely disordered. Secondly the pH of the solution influences the actual pore structure and pore blocking. With lower pH values the pore structure changed from a blocked 3D hexagonal to a non-blocked 2D hexagonal pore system. [1,2] Thirdly the pore size itself is also tuneable. By adding so-called swelling agents the uniform pore diameters of 21 nm could be reached. Even bimodal pore systems with both 8 and 21 nm pores are possible under the correct conditions. [3]  On the last level the particle morphology can be controlled by changing both the co-solvent and the co-solvent/surfactant ratio. In this way spheres, platelets, fibres, cauliflower like structures or intergrown hexagonal structures could be made. [4]  This way ethenylene PMO materials can be tuned hierarchically from within the pore wall up until the particles themselves.   References [1] C. Vercaemst, M. Ide, P.V. Wiper, J.T.A. Jones, Y.Z. Khimyak, F. Verpoort, P. Van Der Voort, Chem. Mater., 2009, 21, 5792 [2] C. Vercaemst, H. Friedrich, P.E. de Jongh, A.V. Neimark, B. Goderis, F. Verpoort, P. Van Der Voort, J. Phys. Chem. C, 2009, 113, 5556 [3] C. Vercaemst, P.E. de Jongh, J.D. Meeldijk, B. Goderis, F. Verpoort, P. Van Der Voort, Chem. Commun., 2009, 4052 [4] C. Vercaemst, M. Ide, H. Friedrich, K.P. de Jong, F. Verpoort, P. Van Der Voort, J. Mater. Chem., 2009, 19, 8839 

Hierachical and bimodal ethenylene PMO materials

https://biblio.ugent.be/publication/1843541/file/1843583

Hierachical and bimodal ethenylene PMO materials

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