Synthesis and characterization of hierarchically ordered porous silica materials
Chemistry of Materials, cilt.16, sa.11, ss.2044-2054, 2004 (Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 16 Sayı: 11
- Basım Tarihi: 2004
- Doi Numarası: 10.1021/cm034946u
- Dergi Adı: Chemistry of Materials
- Derginin Tarandığı İndeksler: Scopus
- Sayfa Sayıları: ss.2044-2054
- Atatürk Üniversitesi Adresli: Hayır
Özet
A series of hierarchically ordered porous silica composites were synthesized using anionic (SO4-2) polystyrene spheres and triblock copolymers Pluronic F127 (EO107PO70EO 107) 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, N 2 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.