Towards a better understanding on the mechanism of mesoporous formation via an assembly of Cn(EO)m and TMOS

Nonionic Fluorinated Surfactant: Investigation of Phase Diagram and Preparation of Ordered Mesoporous Materials

“…In particular, materials synthesized with the fluorinated surfactant exhibit a high degree of organization, reflected by the better resolution of the (110) and (200) secondary reflections. For instance, for the C 16 (EO) 10 −TMOS system, only one broad peak is detected on the SAXS pattern, whereas for compounds prepared with 20 wt % of R F 8 (EO) 9 we can unambiguously distinguish the (110) reflection from that of (200) (Figure A, curve d). In this work, keeping the same synthesis conditions, the hexagonal−disordered hexagonal phase transition with increasing temperature from 40 to 80 °C which is reported for the C 16 (EO) 10 , is not observed.…”

“…For example, under the same synthesis conditions, i.e., pH, surfactant/silica molar ratio, hydrothermal temperature,and duration, hexagonal molecular sieves have been obtained with decaoxyethylene cetyl [C 16 (EO) 10 ] and decaoxyethylene oleyl ether [C 18 (EO) 10 ], the surfactant concentration in aqueous solution being in a wide range of around 10−25 wt %. However, if the surfactant concentration is raised higher than 30%, for example from 30 to 60 wt %, both mild acidic or basic media conduct to the formation of wormhole-like structures. , …”

Highly Ordered Mesoporous and Hierarchically Nanostructured Meso-macroporous Materials for Nanotechnology, Biotechnology, Information Technology and Medical Applications

“…A new approach has been proposed on the basis of the use of non-ionic polyoxyethylene alkyl ether templating molecules [29][30][31][32][33][34][35][36][37][38] which are biodegradable and less toxic and can more easily be removed from the inorganic framework than their ionic counterparts [22][23][24][25][26][27][28]. In our laboratory, a large set of syntheses using Cm(EO)n (m = 6-20 and n = 8-24, in particular, C13(EO)6, C13(EO)12, C13(EO)18, C16(EO)10 and C18(EO)10) have been carried out [39][40][41][42][43][44][45]. In our laboratory, a large set of syntheses using Cm(EO)n (m = 6-20 and n = 8-24, in particular, C13(EO)6, C13(EO)12, C13(EO)18, C16(EO)10 and C18(EO)10) have been carried out [39][40][41][42][43][44][45].…”

“…On the basis of a large series of systematic studies, a relationship has been established between the initial morphology of the micelles in solution and the structure of the final materials [40][41][42][43][44][45]. High surfactant concentrations lead to the formation of a hexagonal micellar phase in solution.…”

“…High surfactant concentrations lead to the formation of a hexagonal micellar phase in solution. Due to the originality of the preparation pathway, these materials were called as CMI-1 and 3 (Chimie des Matériaux Inorganiques), depending on the non-ionic surfactant used, decaoxyethylene cetyl ether [C16(EO)10] and decaoxyethylene oleyl ether respectively [C18(EO)10] [40][41][42][43][44][45]. Conversely, diluted micellar solutions containing only isolated spherical and cylindrical micelles in solution lead to highly ordered hexagonal stackings of channels.…”