Functions of SiO<sub>2</sub>-Shells in Core-Shell Structured Particles

Coating a particle with another material to form a core-shell structured composite is often used in powder technology. Silica has widely been selected as the shell material due to its ease of fabrication, versatile surface functionality, physical and chemical stability. In this artilce, the proctective and modifying roles of silica shells in core-shell particles have been briefly reviewed.