%0 Journal Article
%A Sen, T.
%A Tiddy, G. J. T.
%A Casci, J. L.
%A Anderson, M. W.
%D 2004
%T Synthesis and Characterization of Hierarchically
Ordered Porous Silica Materials
%U https://acs.figshare.com/articles/journal_contribution/Synthesis_and_Characterization_of_Hierarchically_Ordered_Porous_Silica_Materials/3337411
%R 10.1021/cm034946u.s001
%2 https://acs.figshare.com/ndownloader/files/5176627
%K material
%K GB
%K pore
%K macrosphere
%K XRD
%K Porous Silica Materials
%K silica composites
%K presence
%K EO 107 PO 70 EO 107
%K hierarchically
%K TEM
%K SEM
%K NMR
%K nm
%K U.K
%K EO 20 PO 70 EO 20
%K triblock copolymers Pluronic F 127
%K molecule
%K N 2 adsorption
%X A series of hierarchically ordered porous silica composites were synthesized using anionic
(SO4-2) polystyrene spheres and triblock copolymers Pluronic F127 (EO107PO70EO107) and
P123 (EO20PO70EO20) as templates in the presence of cosurfactants (n-alcohols) in an acidic
medium. The silica materials were characterized by XRD, SEM, TEM, Hg porosimetry, N2
adsorption, solid-state NMR, and TG-DTA. At least three distinct pore sizes are observed in
these materials. The composites consist of three-dimensional ordered macrospheres (200−800 nm) with interconnecting uniform-sized (70−130 nm) windows. The walls of these
macrospheres consist of mesostructured pores (3−8 nm). Nitrogen adsorption indicates the
presence of microporosity (<2 nm). Here, we report the detailed synthesis and characterization of such hierarchically ordered porous silica composites (Sen et al. U.K. Patent, GB
0201951.1; Angew. Chem., Int. Ed. 2003, 42, 4649) with macro−meso−microporous structure
and a three-dimensional interconnectivity. These materials could be useful as potential
supports for heterogeneous catalysis for bulkier molecules where diffusion of reactant
molecules could be facilitated.
%I ACS Publications