Given their unique textural and structural properties, TiO2 aerogels are interesting choices for development of high performance photocatalysts. Controlled drying avoids shrinkage and pore collapse, preserving the fine pore network structure in the dried material, and thus resulting in a highly porous low density solid. The possibility of utilizing TiO2 based materials in such applications drives great interest and intense research efforts dedicated to the development of titania nanomaterials with tailored properties in order to maximize photocatalytic activity, in particular high surface area, good crystallinity and controlled crystalline phase composition.Īerogels are a class of nanoporous materials prepared by the controlled drying (usually, by supercritical drying) of wet gels formed by sol-gel derived inorganic or organic crosslinked networks. This paper describes a novel method of synthesizing Fe3O4-SiO2-TiO2 functional nanoparticles with the core-shell structure. Some influencing parameters such as surfactant concentration, tetra-n-butyl titanate amount, and glacial acetic acid amount were investigated. The calculated hydrates volumes by thermodynamic modeling also indicated that TiO 2 would result in producing most hydrates of all the pastes, thus contributing to a denser microstructure and a much higher compressive strength development.TiO2 is a widely studied metal oxide metal semiconductor that shows promising performance as a heterogeneous photocatalyst for energy and environmental applications such as organics pollutants photodegradation for air and water purification, photo-assisted removal of toxic heavy metals and production of solar fuels by water splitting and CO2 reduction. These positively charged SiO2/PS hybrid particles were mixed with tetra-n-butyl titanate for sol-gel reaction to directly form SiO2/PS/TiO2 multilayer core-shell hybrid microspheres.
Sio2 tio2 core shell download#
However, nano-TiO 2 was well distributed when TiO 2 was added because of its limiting effect on the agglomeration of nano-TiO 2, further densifying the microstructure. Download scientific diagram EDS spectrum of (a) SiO2TiO2 core-shell particles and (b) 6 wt. Both SEM and mapping analyses showed that obvious agglomeration of nano-TiO 2 could be observed in nano-TiO 2 modified cement paste, which decreased its efficiency in the cement paste. The results showed that the paste with 1 wt% TiO 2 developed a much higher compressive strength than the paste with or without nano-TiO 2 added at each curing age. Specially, thermodynamic modeling was also applied to predict the phase assemblages and calculate the corresponding volumes. The mechanical property and microstructure of the cement pastes were experimentally characterized using compressive strength and scanning electron microscope (SEM), respectively. RAPID MICROWAVE-ASSISTED SYNTHESIS OF Fe3O4/SiO2/TiO2 CORE-SHELL NANOCOMPOSITE // 19th INTERNATIONAL FOUNDRYMEN CONFERENCE, Humans - Valuable Resource for. Both nanoparticles were used to partially replace cement at 1 wt%. This paper presented the contribution of core/shell TiO 2 nanoparticles to the hydration properties of Portland cement and the contribution was compared with that of nano-TiO 2.
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