The aim of this communication is to investigate the color evolution of silica‐coated hematite nanoparticles versus treating temperature. The silica‐coated hematite nanoparticles were prepared by first suspending commercial hematite nanoparticles in an ammonia–water–2‐propanol system, and then depositing amorphous nano‐SiO2 onto the surface of hematite nanoparticles using the Stöber method. The silica‐coated nanoparticles were dripped onto biscuits and heat treated at various temperatures. The color changes of heat treated samples were determined by the CIE L*a*b* parameters, and the possible mechanism of color evolution was discussed.
This research aims to enhance the thermal stability of CdS nano-particles by a hydrothermally-formed glassy encapsulation structure of SiO2-CeO2. The crystalline phase, thermal effect and microstructure of the encapsulated CdS nanoparticles were investigated by the XRD, DSC-TG and TEM analysis. The results showed that most of the CdS nanoparticles had been encapsulated in the glassy phase of SiO2-CeO2 by a hydrothermal treatment at 200°C. This structure was stable up to more than 900°C, and it was destructed by the crystallization of crystalline CeO2 and SiO2 at a higher temperature. Protected by the glassy phase, the encapsulted CdS nanoparticles was thermally stable up to more than 900°C, which was gradually oxidized and sublimated at the temperature range of 1000-1200°C.
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