A New Synthetic Route to Microporous Silica with Well‐Defined Pores by Replication of a Metal–Organic Framework |
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| Authors: | Dr Atsushi Kondo Dr Anthony Shoji Hall Prof Thomas E Mallouk Prof Kazuyuki Maeda |
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| Affiliation: | 1. Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2‐24‐16 Naka‐cho, Koganei, Tokyo 184‐8588 (Japan), Fax: (+81)?42‐388‐7040;2. Department of Chemistry, The Pennsylvania State University, 104 Chemistry Building, University Park, PA 16802 (USA) |
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| Abstract: | Microporous amorphous hydrophobic silica materials with well‐defined pores were synthesized by replication of the metal–organic framework (MOF) Cu3(1,3,5‐benzenetricarboxylate)2] (HKUST‐1). The silica replicas were obtained by using tetramethoxysilane or tetraethoxysilane as silica precursors and have a micro–meso binary pore system. The BET surface area, the micropore volume, and the mesopore volume of the silica replica, obtained by means of hydrothermal treatment at 423 K with tetraethoxysilane, are 620 m2g?1, 0.18 mL g?1, and 0.55 mL g?1, respectively. Interestingly, the silica has micropores with a pore size of 0.55 nm that corresponds to the pore‐wall thickness of the template MOF. The silica replica is hydrophobic, as confirmed by adsorption analyses, although the replica has a certain amount of silanol groups. This hydrophobicity is due to the unique condensation environment of the silica precursors in the template MOF. |
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| Keywords: | adsorption hydrophobic effect microporous materials metal– organic frameworks silica |
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