Pseudomorphical synthesis of glasses with hierarchical macro- and mesoporosity

• Published in: Microporous and mesoporous materials 2014-10, Vol.197, p.83-91
• Main Authors: Guillot, Marie, El Mourabit, Sabah, Ravaux, Johann, Tokarev, Alexei, Goettmann, Frédéric, Grandjean, Agnès
• Format: Article
• Language: English
• Subjects: Catalysis; Chemical Sciences; Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; Hierarchical porosity; Hybrid materials; Porous materials; Pseudomorph synthesis; Solid phase extraction; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
• ISSN: 1387-1811; 1873-3093
• DOI: 10.1016/j.micromeso.2014.05.034

[Display omitted] •A new synthetic approach is proposed to obtain silica glasses with bimodal porosity.•These hierarchical porous glasses are obtained by pseudomorphical transformation.•The additional surface is available for functionalization by chemical complexes.•The functionalised pseudomorph glasses are good candidate for ionic extraction.•These porous materials could be used for catalysis application. Herein a new synthetic approach, based on pseudomorphical transformation using sodium hydroxide to attack silica matrix during the dissolution/precipitation process, is proposed. Porous silica with the formation of a new mesoporosity inside of glass samples and with the possibility to close its porosity by a thermal treatment is then obtained. Indeed we report on the simple and successful conversion of a purely macroporous glass (obtained via a Vycor® type synthesis) into a macro- and mesoporous solid without modification of the macroscopic shape of the solid. The obtained multi-porous silica was functionalised and further tested as a support for catalysis or solid phase extraction.