Directing the Formation of Vinyl-Functionalized Silica to the Hexagonal SBA-15 or Large-Pore Ia3d Structure

Abstract

Vinyl-functionalized ordered mesoporous silica can be prepared by co-condensation of tetraethoxysilane (TEOS) and triethoxyvinylsilane (TEVS) in the presence of the triblock copolymer Pluronic P123 (EO20PO70EO20) and inorganic salts such as NaCl. At low molar percentage of 10% TEVS, the hexagonal structure analogous to SBA-15 is obtained. With 15% TEVS, a less defined material, but probably closer to the cubic Ia3d structure, is formed. 20% TEVS leads to the formation of well-ordered Ia3d materials over a relatively wide range of temperatures and acid concentrations. The concentration of the added inorganic salts has an influence on the formation of a specific structure. The pore system can be made accessible by treatment with sulfuric acid at elevated temperatures, which selectively removes the copolymer template and does not lead to the cleavage of the Si−C bond. With use of the triblock copolymer Pluronic F127 (EO106PO70EO106) as a template, a vinyl-functionalized structure analogous to SBA-16 can be synthesized.

Weakly Ferromagnetic Ordered Mesoporous Co3O4 Synthesized by Nanocasting from Vinyl‐Functionalized Cubic Ia3d Mesoporous Silica

“…Among them, cobalt oxides demonstrated the best electrochemical properties as lithium storage materials in lithiumion cells. Zhao's group has recently been successful in using microwave-digested (MWD) mesoporous silica (specifically, the two-dimensional hexagonal mesoporous silica, SBA-15, and the three-dimensional caged mesoporous silica, SBA-16) to synthesize nanowires and nanospheres of different metal oxides.[6] We show here that it is possible to create cubic Ia3dCo 3 O 4 using vinyl-functionalized, ordered, mesoporous silica [7] as a template, and demonstrate that the bulk antiferromagnet shows weak ferromagnetism at low temperatures. Following the synthesis procedure given in the Experimental section, a mesoscopically ordered array of Co 3 O 4 was obtained.…”

“…Recently, many efforts have been directed towards the growth of SiNWs. [7,8] However, most of these methods give …”

General Synthesis of Ordered Nonsiliceous Mesoporous Materials

“…Except for 2D (p6m) large pore mesoporous silica SBA-15 (3,25), 3D mesostructures (Im3m, la 3d, Fm3m, etc.) have also been prepared under acidic media by using poly(ethylene oxide)-6/ocA-poly(propylene oxide)-W0c&-poly(ethylene oxide) triblock copolymers (PEO-PPO-PEO) as the templates (26)(27)(28)(29)(30)(31)(32). Mesotunnels can be generated on the pore walls of SBA-15 (33).…”

Selective Chemisorption of Carbon Monoxide by Organic–Inorganic Hybrid Materials Incorporating Cobalt(III) Corroles as Sensing Components

“…Mesoporous silicas with uniform large channels and a stable two-dimensional hexagonal [30][31][32] (SBA-15), cubic [33] (SBA-16), or wormlike [34] (HMS, MSU) structure have already been described. To further study the influence of the inorganic matrix on the adsorption properties of the metallocorrole materials, an ordered mesoporous silica of the SBA-15 type was functionalized into the pores by grafting on the silanol functions the mono-and difunctionalized corrole in such a way to ensure easy access to the active sites.…”