One-pot synthesis of organic polymer functionalized mesoporous silicas

Integrated Process for Structuring and Functionalizing Ordered Mesoporous Silica to Achieve Superprotonic Conductivity

“…More than 99% of PSS chains remained anchored in the material during the PIC dissociation step, demonstrating the high efficiency of the process resulting in an inherently dense and homogeneous distribution of functional polymers along the mesopores. The PSS chains have a known and well-defined DP of 21, which leads to a large amount of acid functions in mesopores: 1.16 mmol per gram of silica, which corresponds to the highest volume density reported so far of 1 SO 3 H function per nm 3 of mesopore volume in mesoporous particles. The success of this direct and integrated strategy can be attributed to (i) the use of PIC micelles as structuring, pore-forming, and functionalizing agents and (ii) the selectivity of the elution process that allows the removal of the oligoamine while keeping the totality of the functional copolymers in the mesopores.…”

“…The process operates under purely aqueous conditions and at room temperature, making it an environmentally friendly and energy-efficient synthesis procedure. The resulting MesoPIC-PSS material obtained has a very high volume density of 1 SO 3 H function per nm 3 of mesopore volume; it also exhibits a superprotonic conductivity, i.e., σ = 2.4 × 10 −2 S cm −1 at 363 K/95% relative humidity (RH), as well as constant performances maintained for 7 days, proving its excellent hydrolytic and chemical stability. These results demonstrate for the first time the interest of mesoporous silica functionalized with polyacids as proton conductors.…”

“…Ordered mesoporous silica (OMS) functionalized by polymers is an emerging class of hybrid materials that combines the singular textural characteristics of inorganic networks with the specific physico-chemical properties of polymers. This gives the materials unique properties that can be attractively triggered by environmental stimuli. − Among OMS, those functionalized with polyacids have proven to be particularly attractive due to their acidic properties, complexation ability, and pH responsiveness, showing excellent performances in many applications, such as heterogeneous catalysts, − permselective mesoporous thin films , and drug carriers, − to name a few. Surprisingly, the proton conduction performance of OMS functionalized with strong polyacids has never been reported, despite the discovery of promising porous materials as proton conductors, e.g., porous sulfonated organic polymers and monosulfonated OMS. − Obviously, the substitution of a monosulfonic acid function with a polysulfonic acid in the porous framework of a stable inorganic backbone is expected to increase the number of labile protons, resulting in a higher density of acid functions for a similar mesopore size.…”

Pushing the limits of nanopore transport performance by polymer functionalization

“…196 Recently, Ngo et al also reported in situ polymer functionalization of mesoporous silica through co-condensation of TEOS and a functional polymer with a triethoxysilane terminal group in the presence of poly(ethylene oxide)- b -polystyrene (PEO- b -PS) used as the pore template. 197 The obtained hybrid material was investigated with respect to its CO 2 gas adsorption capacity with selectivity towards methane and nitrogen.…”

Preparation of Silica Radiation Pore and Its Application as Antimicrobial Carrier

“…Own to the well-developed supramolecular selfassemble and sol-gel chemistry, the mesoporous silicas with varieties of pore architectures and morphologies have been successfully synthesized in the last years. Recently, scientists have focused their research on controlling the pore structure and morphology which directly influence on their applications [1][2][3][4][5][6] .…”