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The procedure consisted in refluxing 1 g (16 mmol SiO2) of each calcined and dehydrated material in 25 ml of dry toluene containing 1.6 mmol of APTES (TEOS/APTES ratio = 1/10) under vigorous stirring at 383 k for 10 h. The functionalized materials were collected by filtration, washed several times with isopropanol and finally dried at 373 K. |
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