Aerosol-assisted synthesis of mesoporous organosilica microspheres with controlled organic contents

Abstract

Periodic mesoporous organosilica (PMO) spherical particles with different organic contents were synthesized in one pot by reacting 1,2-bis(triethoxysilyl)ethane (BTSE) with tetraethylorthosilicate (TEOS) using a spray-drying technique. The scanning electron microscopy observation of spray-dried products clearly showed the formation of spherical particles. The 29 Si magic angle spinning nuclear magnetic resonance data revealed that the organic contents due to ethane fragments embedded in the frameworks were controllable and consistent with the BTSE/TEOS molar ratios of precursor solutions. Transmission electron microscopy, small-angle x-ray scattering, and N 2 adsorption data of PMO with controlled organic contents indicated that the ethane fragments were embedded in the frameworks with the formation of ordered mesostructures. PMO with a high organic content (BTSE/TEOS = 0.50) only showed a hydrophobic property. According to the same procedure, benzene groups were also integrated to a similar degree in the frameworks by using 1,4-bis(triethoxysilyl)benzene.

Templated Synthesis for Nanoarchitectured Porous Materials

“…A spray-drying process was also employed to prepare mesoporous organosilica particles with ethane and benzene fragments by using 1,2-bis(triethoxysilyl)ethane or 1,4-bis(triethoxysilyl)benzene in conjunction with TEOS. 226 The organic contents in the frameworks can be tuned by simply controlling the molar ratio of the initial precursor solutions. The synthesis of phenylenebridged mesoporous organosilica with a crystalline framework was also achieved by the hydrolysis and condensation of 1,4-bis(triethoxysilyl)phenylene.…”

Recent progress in mesoporous titania materials: adjusting morphology for innovative applications

“…Spray drying is a facile, reproducible and scalable technology for the fabrication of mesoporous particles [43][44][45][46][47][48][49]. During this process, a precursor solution consisting of inorganic species, surfactants and solvents is sprayed through a nozzle into a hot chamber with the aid of a gas stream.…”

“…The evaporation-induced self-assembly of droplets is the main mechanism to create mesoporous particles. Since its first report in 1999 [43], this process has been used to fabricate mesoporous particles with different sizes, internal structures and compositions, including silica, organosilica, carbon, and metal oxides [44][45][46][47][48][49].…”

Enzyme-Encapsulated Layer-by-Layer Assemblies: Current Status and Challenges Toward Ultimate Nanodevices

“…Such mesoporous materials provide excellent media for LbL assembly in the preparation of hierarchic nanostructures [300][301][302]. Several modifications of the preparation procedures have permitted syntheses of mesoporous silicates with designed pore geometries in various forms including powders and films [303][304][305][306]. Mesoporous materials are known as effective media to adsorb biomaterials such as proteins [307][308][309][310][311][312] and amino acids [313][314][315][316].…”