Please use this identifier to cite or link to this item:
http://hdl.handle.net/10261/12548
Share/Export:
![]() ![]() |
|
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Title: | Formation of mesostructured silica in nonionic fluorinated surfactant systems |
Authors: | Esquena, Jordi CSIC ORCID; Rodríguez-Abreu, Carlos CSIC ORCID; Solans, Conxita CSIC ORCID; Kunieda, Hironobu | Keywords: | Fluorinated surfactant Self-aggregation Mesostructured material Mesoporous Silica |
Issue Date: | 23-Feb-2006 | Publisher: | Elsevier | Citation: | Microporous and Mesoporous Materialas 92(1-3): 212-219 (2006) | Abstract: | The aqueous phase behavior and preparation of mesoporous silica by new fluorinated surfactants C8F17SO2(C3H7)N(C2H4O)nH (abbreviated C8F17(EO)n) is reported here. C8F17(EO)n forms elongated micelles and liquid crystals in water. Mesostructured silica was prepared by the cooperative self-assembly precipitation method and a systematic study was carried out, investigating the influence of surfactant and silica precursor (TEOS) concentrations, pH and the effect of poly(ethylene oxide) chain lengths. The resulting materials were characterized by SAXS, nitrogen sorption and TEM. The pore inner diameters are small (35 Å) and the pore walls are thick (>20 Å). The materials possess high specific surface areas (≈1000 m2/g), which are achieved at very small surfactant concentrations (2 wt.%), producing robust thick walls with no significant microporosity. The specific surface area is preserved during calcination despite a small shrinkage attributed to silica cross-linking. The d-spacing appeared invariable over a wide range of surfactant/SiO2 ratios, between 0.006 and 1 molar ratios. Hexagonal ordered (p6mm) mesopores were formed at HCl concentrations higher than 0.1 M, while disordered worm-like mesopores were obtained at HCl concentrations lower than 0.1 M. The optimum ethylene oxide chain length to obtain well-ordered mesoporous hexagonal silica corresponded to 10 ethylene oxide units. | Description: | 8 pages, 8 figures, 1 table.-- Printed version published Jun 20, 2006. | Publisher version (URL): | http://dx.doi.org/10.1016/j.micromeso.2006.01.003 | URI: | http://hdl.handle.net/10261/12548 | DOI: | 10.1016/j.micromeso.2006.01.003 | ISSN: | 1387-1811 |
Appears in Collections: | (IQAC) Artículos |
Show full item record
Review this work
SCOPUSTM
Citations
38
checked on May 20, 2022
WEB OF SCIENCETM
Citations
36
checked on May 18, 2022
Page view(s)
313
checked on May 21, 2022
Google ScholarTM
Check
Altmetric
Dimensions
WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.