Preparation of mesoporous/macroporous materials in highly concentrated emulsions based on cubic phases by a single-step method |
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Authors: | Esquena Jordi Nestor Jérémie Vílchez Alejandro Aramaki Kenji Solans Conxita |
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Affiliation: | Institute for Advanced Chemistry of Catalonia, Spanish Council for Scientific Research (IQAC-CSIC) , c/Jordi Girona, 18-26, Barcelona, Spain, and CIBER de Bioingeniería, Biomateriales y Nanomedicina ( CIBER-BBN ), Jordi Girona, 18-26, 08034 Barcelona, Spain. |
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Abstract: | A novel and simple single-step method for the preparation of meso/macroporous silica materials is described, which consists in templating in highly concentrated emulsions with a cubic liquid crystal in the continuous phase. Tetraethyl orthosilicate (TEOS) was solubilized in the aqueous continuous phase of highly concentrated emulsions stabilized by C(12)(EO)(8) and a PEO-PPO-PEO block copolymer nonionic surfactant, with a cubic liquid crystalline phase of the Fd3m type. The resulting silica materials were characterized by small-angle X-ray scattering, nitrogen sorption and transmission electron microscopy. The results showed that a dual pore size distribution was obtained, consisting of mesopores in the nanometer range and macropores between 1 and 5 μm. These dual meso/macroporous silicas with bimodal pore size distribution can possess specific surface areas higher than 400 m(2)/g. |
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