Abstract
AbstractUltrastable MCM‐48 silica with Ia3d cubic structure was synthesized by using only the surfactant cetyltrimethylammonium tosylate (CTATos) as template at extremely low surfactant concentration (CTATos/SiO2 = 0.068). Characterization by small‐angle X‐ray diffraction (XRD), nitrogen adsorption, and high‐resolution transmission electron microscopy (HRTEM) clearly shows that the obtained MCM‐48 silica has a highly ordered structure and large surface area (ca. 1281 m2/g) and pore volume (ca. 1.07 cm3/g). The regular cubic arrays were well retained even after this material was calcined at a high temperature of 900 °C for 3 h or heated at reflux in boiling water for 12 h. The Fourier transform infrared (FTIR) spectrum, thermogravimetric analysis (TG), and chemical analysis provide strong evidence that the formation of MCM‐48 is attributed to the retention of tosylate (Tos–) counteranions of the surfactant in the interface between surfactant and silicate. The current synthetic strategy is suitable for routine and large‐scale preparations of mesoporous silica with different topological structures.
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