title: Gas permeability of ice-templated, unidirectional porous ceramics.
abstract: We investigate the gas flow behavior of unidirectional porous ceramics processed by ice-templating. The pore volume ranged between 54% and 72% and pore size between 2.9 [Formula: see text]m and 19.1 [Formula: see text]m. The maximum permeability ([Formula: see text] [Formula: see text] m[Formula: see text]) was measured in samples with the highest total pore volume (72%) and pore size (19.1 [Formula: see text]m). However, we demonstrate that it is possible to achieve a similar permeability ([Formula: see text] [Formula: see text] m[Formula: see text]) at 54% pore volume by modification of the pore shape. These results were compared with those reported and measured for isotropic porous materials processed by conventional techniques. In unidirectional porous materials tortuosity ([Formula: see text]) is mainly controlled by pore size, unlike in isotropic porous structures where [Formula: see text] is linked to pore volume. Furthermore, we assessed the applicability of Ergun and capillary model in the prediction of permeability and we found that the capillary model accurately describes the gas flow behavior of unidirectional porous materials. Finally, we combined the permeability data obtained here with strength data for these materials to establish links between strength and permeability of ice-templated materials.
authors.affiliation: Laboratoire de Synthese et Fonctionnalisation des Ceramiques, UMR3080 CNRS/Saint-Gobain , Cavaillon , France .
authors.forename: Jordi
authors.initials: J
authors.lastname: Seuba
authors.affiliation: Laboratoire de Synthese et Fonctionnalisation des Ceramiques, UMR3080 CNRS/Saint-Gobain , Cavaillon , France .
authors.forename: Sylvain
authors.initials: S
authors.lastname: Deville
authors.affiliation: Institut Europeen des Membranes, Universite de Montpellier 2 , Place Eugene Bataillon, Montpellier Cedex 5 , France .
authors.forename: Christian
authors.initials: C
authors.lastname: Guizard
authors.affiliation: Laboratoire de Synthese et Fonctionnalisation des Ceramiques, UMR3080 CNRS/Saint-Gobain , Cavaillon , France .
authors.forename: Adam J
authors.initials: AJ
authors.lastname: Stevenson
keywords: 10 Engineering and Structural materials; 102 Porous / Nanoporous / Nanostructured materials; 107 Glass and ceramic materials; 206 Energy conversion/transport/storage/recovery; Ergun’s equation; Permeability; ice-templating; porous ceramics; tortuosity