Fabrication of hierarchically porous spherical particles by assembling mesoporous silica nanoparticles via spray drying.
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.
Urata
Chihiro
C
Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan.
Yamauchi
Yusuke
Y
Aoyama
Yuko
Y
Imasu
Junko
J
Todoroki
Shin-ichi
S
Sakka
Yoshio
Y
Inoue
Satoru
S
Kuroda
Kazuyuki
K