Influence of the hydrolysis and condensation time on the preparation of hybrid materials

Abstract

This work describes the hydrolytic sol-gel synthesis of silica particles prepared by a modified Stöber route, using the organofunctionalized alkoxide 3-methacryloxypropyl trimethoxysilane and tetraethylorthosilicate. The silica particles were obtained through basic catalysis from a mixture of precursor alkoxides, water, and isopropyl alcohol. Samples were prepared with change to the pre-hydrolysis and condensation time of tetraethylortosilicate, followed by addition of the organosilane 3-methacryloxypropyl trimethoxysilane. Eu 3+ ions were added to the alkoxides mixture, in order to obtain structural information about the silica particles. The samples were centrifuged, washed with ethanol, and dried at 50 °C. The xerogel was analyzed by thermogravimetric analysis, photoluminescence, transmission electron microscopy, and infrared spectroscopy. The photoluminescence spectra revealed Eu 3+ lines characteristic of the ion 5 D 0 → 7 F J (J = 0, 1, 2, 3, 4) transition. The thermogravimetric curve and infrared spectra confirmed the presence of the alkoxide organic group and water in the materials. Transmission electron microscopy showed spherical particles with varied size. The time of pre-hydrolysis and condensation as well as the addition of 3-methacryloxypropyl trimethoxysilane affect the final shape and size of the materials, so they can be used as control factors.

Growth and Functionalization of Particle-Based Mesoporous Silica Films and Their Usage in Catalysis

“…Such condensation enables larger amounts of hydrolysed MPTMS to bind to the silica particles, compared to when the condensation of particles is completed. This is in good agreement to the results by Nassor et al [35], who showed that it is easy to wash away the MPTMS when it is added at a late stage of the synthesis.…”

Stabilization of CsPbBr3quantum dots for photocatalysis, imaging and optical sensing in water and biological medium: a review

“…96 They also act as protective bags by adsorbing/absorbing CPQDs through the successive ionic layer adsorption and reaction (SILAR). 97 The biggest advantage of silica precursors is that they are compatible with both toluene 98 and water 99 systems.…”

“…96 They also act as protective bags by adsorbing/absorbing CPQDs through the successive ionic layer adsorption and reaction (SILAR). 97 The biggest advantage of silica precursors is that they are compatible with both toluene 98 and water 99 systems. These silica coatings can be implemented through amine linkages (with cations) or by growing perovskite nanocrystals in mesoporous silica templates.…”