title: Fabrication of hierarchically porous spherical particles by assembling mesoporous silica nanoparticles via spray drying.
abstract: A new type of hierarchically porous materials is fabricated by assembling mesoporous nanoparticles via spray drying. Well-dispersed mesostructured silica nanoparticles (MSN), whose particle size distribution was narrow in the range of 20 nm and 50 nm, were prepared by a thermal deposition method. By spray drying a MSN suspension, MSN were assembled into spherical secondary particles. After calcination, the spherical particles have two types of mesopores, mesopores of 3 nm in size inside of calcined MSN and larger inter-nanoparticle mesopores of about 15-20 nm. This hierarchical pore system should provide nanospaces for efficient mass transport of guest species with different sizes.
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan.
authors.forename: Chihiro
authors.initials: C
authors.lastname: Urata
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Yamauchi
authors.forename: Yuko
authors.initials: Y
authors.lastname: Aoyama
authors.forename: Junko
authors.initials: J
authors.lastname: Imasu
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Todoroki
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Sakka
authors.forename: Satoru
authors.initials: S
authors.lastname: Inoue
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Kuroda