Dual control of external surface and internal pore structure of small ordered mesoporous silica particles directed by mixed polyion complex micelles

Richard, Jason; Phimphachanh, Anthony; Jamet-Fournier, Alix; Cacciaguerra, Thomas; Dieudonné-George, Philippe; Cot, Didier; Destarac, Mathias; Lacroix‐Desmazes, Patrick; Martin, Ivar; Marcotte, Nathalie; Gérardin, Corine

doi:10.1016/j.micromeso.2022.111915

Cited by 2 publications

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References 66 publications

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“…The strategy relies on the use of a novel structure-directing agent, namely, polyion complex (PIC) assemblies, which incorporate desired functionalities that are masked during the sol–gel process, preventing disruption of the mesostructuring process. As reported, − PIC micelles formed with a weak polyacid-based double-hydrophilic block copolymer (DHBC) and an oppositely charged polyelectrolyte direct the structure of PIC-silica materials with tunable textural and structural properties (2D hexagonal, lamellar, cubic), called MesoPIC materials. In most subsequent studies, the PIC assembly has been completely removed from the organic–inorganic hybrid material.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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Polyacid-functionalized inorganic mesoporous materials have attracted considerable interest as catalysts, permselective molecular sieves, or drug carriers. Despite the great interest, their synthesis into ordered mesostructures incorporating polyacids densely and homogeneously distributed in the mesopores is a challenge. Moreover, their properties as conductors for energy applications remain completely unexplored. Here, we report an efficient, one-shot environmentally friendly synthesis route to prepare ordered mesoporous silica functionalized with strong polyacids, which exhibits excellent proton conductivity. We used polyion electrostatic complex micelles as structure-directing, functionalizing, and pore-generating agents to obtain a material of remarkable textural and functional quality. It presents large and ordered mesopores hosting monodisperse polyacid chains corresponding to a dense and homogeneous functionalization of 1.2 mmol SO3H g SiO2 −1 and a function density of 1 SO 3 H per nm 3 of mesopore volume. Overcoming the performance-limiting inhomogeneities, we designed a superprotonic conductor, while the high value of the conductivity, 0.024 S cm −1 at 363 K/95% relative humidity, was maintained for at least 7 days.

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