Abstract
A facile and direct method for synthesizing magnetic periodic mesoporous organosilica nanoparticles from pure organosilane precursors is described. Magnetic ethylene- and phenylene-bridged periodic mesoporous organosilica nanoparticles (PMO NPs) were prepared by nanoemulsification techniques. For fabricating magnetic ethylene- or phenylene-bridged PMO NPs, hydrophobic magnetic nanoparticles in an oil-in-water (o/w) emulsion were prepared, followed by a sol–gel condensation of the incorporated bridged organosilane precursor (1,2 bis(triethoxysilyl)ethane or 1,4 bis(triethoxysilyl)benzene), respectively. The resulting materials were characterized using high-resolution scanning electron microscopy (HR-SEM), high-resolution transmission electron microscopy (HR-TEM), energy-dispersive X-ray (EDX) spectroscopy, powder X-ray diffraction (XRD), solid-state NMR analysis, and nitrogen sorption analysis (N2-BET). The magnetic ethylene-bridged PMO NPs were successfully loaded using a ruthenium oxide catalyst by means of sonication and evaporation under mild conditions. The obtained catalytic system, termed Ru@M-Ethylene-PMO NPS, was applied in a reduction reaction of aromatic compounds. It exhibited very high catalytic behavior with easy separation from the reaction medium by applying an external magnetic field.
Highlights
Since the discovery of periodic mesoporous organosilica (PMO) bulk materials in 1999 by three independent groups [1–3], they have been studied intensively because of their great potential in designing and fabricating new organic–inorganic hybrid materials with unique properties including high surface areas, high thermal stability, as well as facile separation and recovery as solid materials [4–21]
We describe the synthesis of magnetic ethylene- and phenylene-bridged periodic mesoporous organosilica nanoparticles (PMO NPs) that were prepared by a sol–gel process under mild conditions from pure organosilane precursors in the presence of a cetyltrimethylammonium bromide (CTAB) surfactant with the addition of hydrophobic magnetite nanoparticles
Magnetic periodic mesoporous organosilica nanoparticles were synthesized in a sol–gel process under mild conditions
Summary
Since the discovery of periodic mesoporous organosilica (PMO) bulk materials in 1999 by three independent groups [1–3], they have been studied intensively because of their great potential in designing and fabricating new organic–inorganic hybrid materials with unique properties including high surface areas, high thermal stability, as well as facile separation and recovery as solid materials [4–21]. The homogeneous distribution of organic molecules in their frameworks and their uniform mesopores provides them with advantageous properties for hosting metal catalysts or metal nanoparticles within their voids and channels. Because of these features, catalytic transformations mediated by these PMO nanomaterials have been highly studied, developed and utilized [50–53]
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