Percolation transition in the porous structure of latex-templated silica monolithsReport as inadecuate

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1 LPMC - Laboratoire de physique de la matière condensée 2 SVI - Surface du Verre et Interfaces 3 INSP - Institut des Nanosciences de Paris 4 C2P2 - Laboratoire de Chimie, Catalyse, Polymères et Procédés, R 5265

Abstract : Porous sol-gel silica monoliths are prepared using PMMA nanoparticles, 60 nm in diameter, as sacrificial templates. The pore-structure of the calcined pellets is investigated through nitrogen adsorption to assess the evolution of the porosity when varying the amount of porogen. The latex templated monoliths present a well defined spherical extrinsic porosity and an intrinsic microporosity due to preparation process. As a result of a careful analysis of the adsorption hysteresis, we identify a percolation threshold of the spherical porosity around 30% volume fraction. This phenomenon, similar to the percolation previously observed in latex-templated silica films, opens the way to the use of latex-templated porous silica monoliths with a tailorable and reliable pore structure.

Keywords : mesoporous silica monoliths Latex templated silica sol-gel silica Porosity percolation adsorption isotherms

Author: François Guillemot - Aline Brunet-Bruneau - Elodie Bourgeat-Lami - Jean-Pierre Boilot - Etienne Barthel - Thierry Gacoin -



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