Contact
    Start Publications Enhanced Structural Control of Soft-Templated Mesoporous ...
    ←  Publication Finder
    QSense

    Enhanced Structural Control of Soft-Templated Mesoporous Inorganic Thin Films by Inert Processing Conditions

    Journal: ACS Appl. Mater. Interfaces, Volume 14, DEC 21, page 56143–56155

    Authors: Fornerod, Maximiliano Jesus Jara; Alvarez-Fernandez, Alberto; Williams, Eric R.; Skoda, Maximilian W. A.; Prieto-Simon, Beatriz; Voelcker, Nicolas H.; Stefik, Morgan; Coppens, Marc-Olivier; Guldin, Stefan

    Organizations: EPSRC New Investigator award [EP/R035105/1]; Henry Royce Institute through the Royce [EP/R00661X/1]; NSF [DMR-1752615]; EPSRC Frontier Engineering: Progression Grant in Nature-Inspired Engineering [EP/S03305X/1]

    Keywords: thin films; mesoporous; calcination; sol-gel; block copolymers

    Mesoporous thin films are widely used for applications in need of high surface area and efficient mass and charge transport properties. A well-established fabrication process involves the supramolecular assembly of organic molecules (e.g., block copolymers and surfactants) with inorganic materials obtained by sol-gel chemistry. Typically, subsequent calcination in air removes the organic template and reveals the porous inorganic network. A significant challenge for such coatings is the anisotropic shrinkage due to the volume contraction related to solvent evaporation, inorganic condensation, and template removal, affecting the final porosity as well as pore shape, size, arrangement, and accessibility. Here, we show that a two-step calcination process, composed of high-temperature treatment in argon followed by air calcination, is an effective fabrication strategy to reduce film contraction and enhance structural control of mesoporous thin films. Crucially, the formation of a transient carbonaceous scaffold enables the inorganic matrix to fully condense before template removal. The resulting mesoporous films retain a higher porosity as well as bigger pores with extended porous order. Such films present favorable characteristics for mass transport of large molecules. This is demonstrated for lysozyme adsorption into the mesoporous thin films as an example of enzyme storage.
    View publication