Abstract
Silicas with large (about 10 nm in diameter), uniform, cage-like pores were synthesized from sodium silicate and poly(ethylene oxide)−poly(butylene oxide)−poly(ethylene oxide) B50-6600 triblock copolymer template (EO39BO47EO39) under acidic conditions. The synthesis procedure was analogous to that reported by others for FDU-1 silica with highly ordered cubic Im3m structure, but in our study, an expensive tetraethyl orthosilicate (TEOS) was successfully replaced by cost-efficient sodium silicate. Adsorption and thermogravimetric properties of the silicas synthesized from sodium silicate were found to closely resemble those of FDU-1 silicas synthesized from TEOS, but the pore volumes and specific surface areas of the former were found to be lower in most cases. The uniform cage-like structures assembled from sodium silicate formed at room temperature and 318 K, but no ordered structure was obtained at 333 K, whereas in the case of TEOS, an ordered structure formed also at 333 K. The sample synthesized at ro...
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