ZnO particle was coated with thin nanoporous silica layers, and hollow nanoporous silica particles were obtained by removing ZnO (core).
ASJC Scopus subject areas
Ogawa, M., Naito, D., & Shimura, N. (2007). Preparation of ZnO-core/nanoporous silica-shell particle and the conversion to hollow nanoporous silica particle. Chemistry Letters, 36(3), 462-463. https://doi.org/10.1246/cl.2007.462