Nanocrystal HZSM-5 zeolite aggregates with different SiO2/Al2O3 molar ratios were prepared under low temperature and were used to catalyze the conversion of methanol to propylene and butene. The coke location, coke content, and coke species deposited on HZSM-5 aggregates were investigated. The near-graphite carbon on the external surface of HZSM-5 zeolite (SiO2/Al2O3 molar ratio = 400) was dist...

An optical fibre long period grating (LPG), modified with a coating of silica gold (SiO2:Au) core/shell nanoparticles (NPs) deposited using the layer-by-layer (LbL) method, was employed for the development of a bio-sensor. The SiO2:Au NPs were electrostatically assembled onto the LPG with the aid of a poly(hydrochloride ammonium) (PAH) polycation layer. The LPG sensor operates at the phase matc...

We developed a new strategy, i.e., a seed-assisted method, to fabricate a three-dimensional (3D) SiO2@Fe3O4 core/shell nanorod array/graphene architecture. The fabrication processes involved deposition of β-FeOOH seeds on the graphene surfaces in the ferric nitrate aqueous solution, subsequent growth of β-FeOOH nanorod arrays on the graphene surfaces in the ferric chloride aqueous solution unde...

The photosensitizer (PS) methylene blue (MB) is confined in the close vicinity of an Au nanorod, by incorporating it into SiO2 during Au-core/SiO2-shell nanoparticle (NP) growth. Upon light irradiation of the Au@(SiO2-MB) NPs, generation of reactive oxygen species and their transport to the cytoplasm are directly responsible for significantly decreased cell viability. We have excluded the indep...

YVO4:Eu ,Bi phosphors have been prepared by the high-temperature solid-state (HT) method and the Pechini-type sol–gel (SG) method. Spherical SiO2 particles have been further coated with YVO4:Eu ,Bi phosphor layers by the Pechini-type SG process, and it leads to the formation of core–shell structured SiO2/YVO4:Eu ,Bi phosphors. Therefore, the phase formations, structures, morphologies, and photo...

We present the fabrication of core-shell-satellite [email protected]2-Pt nanostructures and demonstrate that LSPR excitation core Au nanoparticle can induce plasmon coupling effect to initiate photocatalytic hydrogen generation from decomposition formic acid. Further studies suggest induces a strong local electric field between Pt nanoparticles on SiO2 shell, which enables creation hot electron...

Engineered amorphous silica nanoparticles (SiO2 NPs), due to simple and low cost production, are increasingly used in commercial products and produced on an industrial scale. Despite the potential benefits, there is a concern that exposure to certain types of SiO2 NPs may lead to adverse health effects. As some NPs can cross the blood--brain barrier and may, in addition, reach the central nervo...

The application of novel core-shell nanowires composed of ZnGa2O4/ZnO to improve the sensitivity of NO2 gas sensors is demonstrated in this study. The growth of ZnGa2O4/ZnO core-shell nanowires is performed by reactive evaporation on patterned ZnO:Ga/SiO2/Si templates at 600 °C. This is to form the homogeneous structure of the sensors investigated in this report to assess their sensitivity in t...