Synthesis and Textural Characterization of Mesoporous and Meso-/Macroporous Silica Monoliths Obtained by Spinodal Decomposition

Anne Galarneau (1) , Zakaria Abid (1, 2) , Bilel Said (1) , Youcef Did (1) , Katarzyna Szymanska (3) , Andrzej Jarzebski (3, 4) , Franck Tancret (5) , Hadj Hamaizi (5, 2) , Abdelkader Bengueddach (2) , Francesco Di Renzo (1) , Francois Fajula (1)

1 ICGM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
2 Université d'Oran 1, Mat Chem Lab, Oran Es Senia, Algeria
3 Silesian University of Technology
4 Polish Academy of Sciences Institute of ChemicalEngineering
5 IMN - Institut des Matériaux Jean Rouxel

Silica monoliths featuring either mesopores or flow-through macropores and mesopores in their skeleton are prepared by combining spinodal phase separation and sol-gel condensation.The macroporous network is first generated by phase separation in acidic medium in the presence of polyethyleneoxides while mesoporosity is engineered in a second step in alkaline medium, possibly in the presence of alkylammonium cations as surfactants. The mesoporous monoliths, also referred as aerogels, are obtained in the presence of alkylpolyethylene oxides in acidic medium without the use of supercritical drying. The impact of the experimental conditions on pore architecture of the monoliths regarding the shape, the ordering, the size and the connectivity of the mesopores is comprehensively discussed based on a critical appraisal of the different models used for textural analysis.

Mots clés: hierarchical material; silica monolith; aerogel; pressure drop; pore size; pore shape

Domaines: Matériaux

Anne Galarneau, Zakaria Abid, Bilel Said, Youcef Did, Katarzyna Szymanska, et al.. Synthesis and Textural Characterization of Mesoporous and Meso-/Macroporous Silica Monoliths Obtained by Spinodal Decomposition. Inorganics, 2016, 4 (2), pp.9. ⟨10.3390/inorganics4020009⟩. ⟨hal-01318931⟩