Modified epoxy resin/modified nano-SiO2 composite was prepared employing urethane acrylate to modify epoxy resin E-44 and silane coupling agent for the modification of SiO2 nanoparticles. The obtained materials were characterized by Fourier Transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), mechanical strength test and hardness test. The composite displayed a significantly increased mechanical properties and great application prospects in dental materials.
Bifunctional magnetic-fluorescent Fe 3 O 4 @SiO 2 @ZnS nanocomposites were synthesised by a chemical deposition method. The Fe 3 O 4 magnetic nanoparticles as the core were obtained by means of a solvothermal reaction with SiO 2 as the shell. ZnS particles were linked to Fe 3 O 4 @SiO 2 core-shell nanostructures. The morphology and properties of the resultant Fe 3 O 4 @SiO 2 @ZnS nanocomposites were investigated by X-ray diffraction, field emission scanning electron microscopy, high-resolution transmission electron microscopy, a vibration sample magnetometer and fluorescence microscopy. The results showed that bead-like structures were built from numerous Fe 3 O 4 @SiO 2 @ZnS microspheres with an average size of 250 nm. The saturation magnetisation (M s) value of Fe 3 O 4 @SiO 2 @ZnS nanocomposites was 22.41 emu/g at room temperature. Furthermore, a strong blue light emission was observed from the nanocomposites under UV light irradiation. The combination of magnetic and fluorescent properties may lead to Fe 3 O 4 @SiO 2 @ZnS nanocomposites having a variety of potential applications in the field of biomedicine, such as bioimaging and cell separation.
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