Synthesis of large-pore face-centered-cubic periodic mesoporous organosilicas with unsaturated bridging groups

Abstract

Periodic mesoporous organosilicas (PMOs) with ethenylene (-CH=CH-) bridging groups in the framework and large spherical mesopores of tunable size arranged in facecentered-cubic structures (Fm3m symmetry) were synthesized using Pluronic F127 (EO 106 PO 70 EO 106) as a surfactant and xylene (isomer mixture) as a swelling agent at low temperature (7 °C) under moderately acidic conditions (0.1 M HCl). The resulting PMOs were characterized by small-angle X-ray scattering, nitrogen adsorption, transmission electron microscopy and solid-state 29 Si NMR. The unit-cell parameters were enlarged from 31 to 42 nm and the pore diameters increased from 14 nm to as much as 22 nm while increasing the amount of the swelling agent in the reaction mixture, until these two structural parameters reached a plateau. The enlargement was not accompanied by a loss

Stabilization of nanosized MgFe2O4 nanoparticles in phenylene-bridged KIT-6-type ordered mesoporous organosilica (PMO)

“…PMOs are not functionality-limited, so the PMO material could be tailored for the desired application. Therefore, PMOs with more or less hydrophilic surface areas or heteroatom containing ones are possible [19][20][21][22][23][24][25]. PMOs also have a high chemical stability comparable to OMS.…”

Mesoporous Polysilsesquioxanes: Preparation, Properties, and Applications

“…Over the last few decades, a variety of mesoporous architectures have been prepared from an even vaster field of surfactants and polymer templates. The self-assembled surfactants can be lamellar, hexagonal close-packed cylinders (p6mm) (Cho and Char 2004;Park et al 2008), simple cubic (Pm3n) (Sayari et al 2000;Rebbin et al 2012), face-centered cubic (Fm3m) (Liang et al 2005;Manchanda and Kruk 2016), 3D body-centered cubic (Im3m) (Grudzien et al 2006;Cho et al 2012), and bicontinuous cubic, gyroidal networks (Ia3d) (Wang et al 2003;Xia et al 2014) (Fig. 3).…”

Preparation and Characterization of Novel Mixed Periodic Mesoporous Organosilica Nanoparticles

“…Periodic mesoporous organosilica materials, at the bulk (PMO) [1][2][3] and nanoscale (PMO NPs) level, are fundamentally unique because they have several advantages, such as robust porous organic-inorganic framework [4], porous channels [5], tunable pore size organization [6,7], biocompatibility [8], and the highest organic content (nano)materials [9].…”