Facile synthesis of monodisperse polymer/SiO2/polymer/TiO2 tetra-layer microspheres and the corresponding double-walled hollow SiO2/TiO2 microspheres

Monodisperse P(EGDMA-co-MAA)/SiO2/P(EGDMA-co-MAA)/TiO2 tetra-layer microspheres and the corresponding hollow SiO2/TiO2 double-walled microspheres were synthesized by the combination of distillation precipitation polymerization and controlled sol-gel process and further calcination in air.