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We report herein the preparation of mixed periodic mesoporous organosilica nanoparticles ( E-Pn 75/25  and  90/10 PMO NPs ) by sol-gel co-condensation of  E -1,2-bis(triethoxysilyl)ethylene (( E )-BTSE or  E ) with previously synthesized disilylated  tert -butyl 3,5-dialkoxybenzoates bearing either sulfide (precursor  P1 ) or carbamate (precursor  P2 ) functionalities in the linker. The syntheses were performed with cetyltrimethylammonium bromide (CTAB) as template in the presence of sodium hydroxide in water at 80 °C. The nanomaterials have been characterized by Transmission Electron Microscopy (TEM), nitrogen-sorption measurements (BET), Dynamic Light Scattering (DLS), zeta-potential, Thermogravimetric Analysis (TGA), FTIR,  13 C CP MAS NMR and small angle X-ray diffraction (p-XRD). All the nanomaterials were obtained as mesoporous rodlike-shape nanoparticles. Remarkably,  E-Pn 90/10 PMO NPs  presented high specific surface areas ranging from 700 to 970 m 2 g −1 , comparable or even higher than pure  E PMO  nanorods. Moreover, XRD analyses showed an organized porosity for  E-P1 90/10 PMO NPs  typical for a hexagonal 2D symmetry. The other materials showed a worm-like mesoporosity.

Preparation and Characterization of Novel Mixed Periodic Mesoporous Organosilica Nanoparticles