Contribution to the study of the formation mechanism of mesoporous silica type SBA-3

Mesa, Mónica; Sierra, Ligia; Guth, J.L.

doi:10.1016/j.micromeso.2006.12.009

Cited by 16 publications

(15 citation statements)

References 38 publications

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“…DLS: dynamic light scattering is seldom used to follow evolution of overall micellar size during self-assembly process, as ref. 16 and references therein put in evidence. Time-scale of DLS measures must be considered in the minute range (from 1 to 5) to obtain exploitable significant results.…”

Section: Insertmentioning

confidence: 99%

Time-Resolved in Situ Raman and Small-Angle X-ray Diffraction Experiments: From Silica-Precursor Hydrolysis to Development of Mesoscopic Order in SBA-3 Surfactant-Templated Silica

et al. 2007

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Time-resolved in situ Raman spectroscopy and small-angle X-ray diffraction have been combined in order to characterize the formation of hexagonal mesostructured SBA-3 silica. Experiments were performed under identical synthesis conditions in order to correlate the molecular and mesoscopic scales. Cetyltrimethylammonium bromide (CTAB) was used as the structuring agent with tetraethoxysilane (TEOS) as the silica precursor at a constant CTAB/TEOS molar ratio under highly acidic conditions and for various dilutions. Raman spectra allowed quantification of the release of ethanol that was produced solely by hydrolysis of TEOS under the experimental conditions used. The hydrolysis kinetics of TEOS was greatly enhanced in the presence of the surfactant as a result of micellar solubilization and surfactant stabilization of emulsion droplets. At the time of precipitation, the degree of TEOS hydrolysis depended strongly on the TEOS/CTAB concentration, decreasing with increasing concentration. The time evolution of the d-spacing and the full width at half-maximum of the (10) main reflection in the XRD pattern showed two distinct stages that were also strongly dependent on the sol composition. There seemed to be a coexistence of an ordered phase and a disordered one for a longer time in SBA-3 compared with MCM-41, clearly indicating that the ordering process is slower for SBA-3.

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Section: Insertmentioning

confidence: 99%

Time-Resolved in Situ Raman and Small-Angle X-ray Diffraction Experiments: From Silica-Precursor Hydrolysis to Development of Mesoscopic Order in SBA-3 Surfactant-Templated Silica

et al. 2007

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“…As a result, a hybrid material is obtained, its organic component can be extracted with solvents otherwise can be calcined to give rise to a solid structure based on an irregular arrangement or irregular channels with silica walls. 1,2 Ionic liquids (IL) are a synthetic group of chemicals with a growing interest due to their unique properties including melting points below 100°C, negligible vapor pressures, high thermal stabilities, high viscosities, and the great number of anions and cations available 3 that allow tailoring the ionic liquids based on the applications. Due to all these properties, there is a broad field of potential applications; our interest is as an extracting media.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of 1-Methyl-3-Methoxysilyl Propyl Imidazolium Chloride – Mesoporous Silica Composite as Adsorbent for Dehydration in Industrial Processes

Liévano

Díaz

2016

Mat. Res.

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“…[58][59] Cetyltrimethylammonium bromide (CTAB) and tetraethyl orthosilicate (TEOS) were used as surfactant and silica source, respectively. An aqueous solution of 37 % HCl was used to adjust the pH value of the reaction.…”

Section: Introductionmentioning

confidence: 99%

Solid‐State NMR Characterization of Wilkinson’s Catalyst Immobilized in Mesoporous SBA‐3 Silica

Grünberg

Breitzke

et al. 2010

Chemistry A European J

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The Wilkinson's catalyst [RhCl(PPh(3))(3)] has been immobilized inside the pores of amine functionalized mesoporous silica material SBA-3 and The structure of the modified silica surface and the immobilized rhodium complex was determined by a combination of different solid-state NMR methods. The successful modification of the silica surface was confirmed by (29)Si CP-MAS NMR experiments. The presence of the T(n) peaks confirms the successful functionalization of the support and shows the way of binding the organic groups to the surface of the mesopores. (31)P-(31)P J-resolved 2D MAS NMR experiments were conducted in order to characterize the binding of the immobilized catalyst to the amine groups of the linkers attached to the silica surface. The pure catalyst exhibits a considerable (31)P-(31)P J-coupling, well resolvable in 2D MAS NMR experiments. This J-coupling was utilized to determine the binding mode of the catalyst to the linkers on the silica surface and the number of triphenylphosphine ligands that are replaced by coordination bonds to the amine groups. From the absence of any resolvable (31)P-(31)P J-coupling in off-magic-angle-spinning experiments, as well as slow-spinning MAS experiments, it is concluded, that two triphenylphosphine ligands are replaced and that the catalyst is bonded to the silica surface through two linker molecules.

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Contribution to the study of the formation mechanism of mesoporous silica type SBA-3

Cited by 16 publications

References 38 publications

Time-Resolved in Situ Raman and Small-Angle X-ray Diffraction Experiments: From Silica-Precursor Hydrolysis to Development of Mesoscopic Order in SBA-3 Surfactant-Templated Silica

Time-Resolved in Situ Raman and Small-Angle X-ray Diffraction Experiments: From Silica-Precursor Hydrolysis to Development of Mesoscopic Order in SBA-3 Surfactant-Templated Silica

Synthesis and Characterization of 1-Methyl-3-Methoxysilyl Propyl Imidazolium Chloride – Mesoporous Silica Composite as Adsorbent for Dehydration in Industrial Processes

Solid‐State NMR Characterization of Wilkinson’s Catalyst Immobilized in Mesoporous SBA‐3 Silica

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