Synthesis of SiO2@TiO2 Core-Shell Particles with Controlled Shell Thickness for Thermal Management Applications

Titania coating on silica core particles was performed from monodisperse silica spheres with mean diameter of 800 nm using tetrabutyl titanate by Stober method. The thickness of the titania coating layer was varied from 30 nm to 100 nm depending on the concentration of tetrabutyl titanate. After calcining the core-shell particles in air at 550 degrees C for 1 h, anatase titania coating layer was obtained suitable for scattering near infrared radiation. The preparation route is a modification of sol-gel method, i.e. a hydrothermal process is also involved. Additionally, it is a simple route without an added coupling agent or surfactant.