Abstract
FDU-1 silicas with large (∼10 nm) cage-like mesopores were synthesized under acidic conditions using a poly(ethylene oxide)−poly(butylene oxide)−poly(ethylene oxide) triblock copolymer template. Structural changes caused by heating in water at 373 K for different periods of time (from 3 hours to 32 days) and by calcination at 973−1273 K were investigated in order to assess the hydrothermal and thermal stability of FDU-1. It was shown that FDU-1 exhibits a hydrothermal stability unprecedented among ordered mesoporous silicas (OMSs), because it retains its uniform mesopores even after 32 days of heating in water at 373 K, which is by one or two orders of magnitude longer than in the case of typical OMSs and at least two times longer than in the reported cases of the most stable OMSs. This exceptional hydrothermal stability of FDU-1 can be attributed to the combination of its extremely large average wall thickness and the continuous 3-dimensional nature of its thick wall backbone. The boiling water appears t...
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