Preparation of mesoporous/macroporous materials in highly concentrated emulsions based on cubic phases by a single-step method.
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.
Institute for Advanced Chemistry of Catalonia, Spanish Council for Scientific Research (IQAC-CSIC), Barcelona, Spain. jordi.esquena@iqac.csic.es
Jordi
J
Esquena
Jérémie
J
Nestor
Alejandro
A
Vílchez
Kenji
K
Aramaki
Conxita
C
Solans
D000473:Alkanes / Q000737:chemistry*; D004655:Emulsions; D011095:Polyethylenes / Q000737:chemistry*; D011126:Polypropylenes / Q000737:chemistry*; D016062:Porosity; D053838:Scattering, Small Angle; D012821:Silanes / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction
D000473:Alkanes; D004655:Emulsions; D011095:Polyethylenes; D011126:Polypropylenes; D012821:Silanes; D013501:Surface-Active Agents; D014867:Water; C040733:tetraethoxysilane; D012822:Silicon Dioxide; C078661:UCON 50-HB-5100; C012867:decane