Facile method to synthesize platelet SBA-15 silica with highly ordered large mesopores

Cao, Liang; Kruk, Michał

doi:10.1016/j.jcis.2011.05.076

Cited by 31 publications

(19 citation statements)

References 47 publications

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“…The initial reaction temperature of hydrolysis must be lower than these critical ones to form highly hexagonally ordered mesostructure. Similar request of low reaction temperature was also found in the synthesis of SBA-15 type mesoporous silica with 1,3,5-triisopropylbenzene (TIPB) as a micelle expander [58]. Cao and Kruk usedhexane as swelling agent and low temperature (15 ∘ C) of initial synthesis condition, similar to that of Sun et al [37], to obtain highly ordered SBA-15 silica materials with pore diameters ranging from 12 to 18 nm [67].…”

Section: Journal Of Chemistrysupporting

confidence: 54%

“…However, the driving force to speciate formation of such novel cubo-like morphology was still indistinct. Actually, the TEM image of this SBA-15 with short channels looks more like the cross section [51] of a platelet-like [58,59] or a short rod-like [60] SBA-15 materials, as short nanochannels (100-300 nm long) could run parallel to the thickness of the nanostructured hexagonal platelet-like or rod-like particles. The high-resolution TEM (HRTEM) image of such SBA-15 sample prepared with a decane/P123 ratio at 5.8 : 1 intensifies such hypothesis [34].…”

Section: Effect Of Alkanes On Morphologymentioning

confidence: 97%

“…With the removal of upper alkane-rich layer prior to the addition of TEOS, only -decane-P123-water system can result in the formation of hexagonally ordered MSM [53]. The -hexane-P123-water system leads to the formation of MCF material, which has typical MCF morphology and mesostructure as that of the MCF materials prepared with TMB [9] or TIPB [41,42,58,67]. However, the pore size of such MCF material prepared with -hexane is around 10 nm, much different from that of the MCF materials prepared with TMB or TIPB.…”

Section: Synthesis With the Separation Of Alkane-rich And Water-richmentioning

confidence: 99%

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Novel Mesoporous Silica Materials with Hierarchically Ordered Nanochannel: Synthesis with the Assistance of Straight-Chain Alkanes and Application

Zhang

2016

Journal of Chemistry

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The straight-chain alkane-assisted synthesis of hierarchical mesoporous silica materials (MSM) results in variable mesostructures and morphologies due to remarkably different self-assembly routes of template agent from those without the assistance of straight-chain alkanes. The textural properties, particularly pore size, channel structure, morphology, and hierarchical structure of those MSM make them demonstrate peculiar effects in the immobilization of homogeneous catalysts.

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Section: Journal Of Chemistrysupporting

confidence: 54%

Section: Effect Of Alkanes On Morphologymentioning

confidence: 97%

Section: Synthesis With the Separation Of Alkane-rich And Water-richmentioning

confidence: 99%

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Novel Mesoporous Silica Materials with Hierarchically Ordered Nanochannel: Synthesis with the Assistance of Straight-Chain Alkanes and Application

Zhang

2016

Journal of Chemistry

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“…Platelets have also been synthesized in a similar system by complete removal of the NH 4 F [158]. It has also been shown that increasing the TEOS to P123 molar ratio in a system including decane makes it possible to form the platelet morphology [91].…”

Section: Plateletsmentioning

confidence: 99%

“…As an alternative to alkanes, 1,3,5-triisopropylbenzene (TIPB) can be used in a similar synthesis, but the temperature needs to be decreased further [21,22,93,158]. Again, the solubility of the swelling agent in the micellar core is the key for forming the large pores.…”

Section: Hydrocarbons At Low Temperaturementioning

confidence: 99%

Mesoporous Building Blocks: Synthesis and Characterization of Mesoporous Silica Particles and Films

Björk¹

2013

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On the cover, the structure of SBA-15 is illustrated. Inside the pores SEM micrographs have been inserted showing (clockwise from the top): rods, fibers, a film consisting of rods grown on a substrate, a film consisting of platelets grafted on a substrate, short rods, and platelets. In the center the sheet morphology is presented.© Emma Björk, unless otherwise stated.ISBN: 978-91-7519-516-2 ISSN: 0345-7524 Printed by LiU-tryck, Linköping, Sweden, 2013 Research is formalized curiosity. It is poking and prying with a purposeZora Neale Hurston (1903Hurston ( -1960 i ABSTRACTCatalyst supports, drug delivery systems, hosts for nanoparticles, and solar cells are just some examples of the wide range of exciting applications for mesoporous silica. In order to optimize the performance of a specific application, controlling the material's morphology and pore size is crucial. For example, short and separated particles are beneficial for drug delivery systems, while for molecular sieves, the pore size is the key parameter.In this thesis, mesoporous silica building blocks, crystallites, with hexagonally ordered cylindrical pores were synthesized, with the aim to understand how the synthesis parameters affect the particle morphology and pore size. The synthesis of the particles is performed using a sol-gel process, and in order to increase the pore size, a combination of low temperature, and additions of heptane and NH 4 F was used. By variations in the amounts of reagents, as well as other synthesis conditions, the particle morphology and pore size could be altered. Separated particles were also grown on or attached to substrates to form films. Also, a material with spherical pore structure was synthesized, for the first time using this method.It was found that a variation in the heptane concentration, in combination with a long stirring time, yields a transition between fiber and sheet morphologies. Both morphologies consist of crystallites, which for the fibers are joined end to end, while for the sheets they are attached side by side such that the pores are accessible from the sheet surface. The crystallites can be separated to a rod morphology by decreasing the stirring time and tuning the HCl concentration, and it was seen that these rods are formed within 5 min of static time, even though the pore size and unit cell parameters were evolving for another 30 min. Further studies of the effects of heptane showed that the shape and mesoscopic parameters of the rods are affected by the heptane concentration, up to a value where the micelles are fully saturated with heptane. It was also observed that the particle width increases with decreasing NH 4 F concentration, independent of heptane amount, and a platelet morphology can be formed. The formation time of the particles decrease with decreasing NH 4 F, and the growth mechanism for platelets was further studied. The pore sizes for various morphologies were altered by e.g. variations in the hydrothermal treatment conditions, or the method for removing the surfactants.ii T...

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Transition from 2D to 3D SBA‐15 by High‐Temperature Fluoride Addition and its Impact on the Surface Reactivity Probed by Isopropanol Conversion

Lamoth

Gries

Girgsdies

et al. 2020

Chemistry A European J

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A systematic variation of the SBA‐15 synthesis conditions and their impact on the structural and chemical characteristics are reported. An incremental alteration of the hydrothermal aging temperature and time was used to induce changes of the highly ordered SBA‐15 structure. Any effects on the total surface area, mesopores size, micropore contributions, and pore connectivity are amplified by a combined incremental increase of the NH4F concentration. Based on changes of the unit‐cell parameter as a function of the mesopore size, and a feature in the low‐angle XRD pattern, useful descriptors for the disorder of the corresponding SBA‐15 are identified. An additional analysis of the Brunauer–Emmett–Teller (BET) surface area and pore size distributions enables investigations of the structural integrity of the material. This systematic approach allows the identification of coherencies between the evolution of physical SBA‐15 properties. The obtained correlations of the surface and structural characteristics allow the discrimination between highly ordered 2D SBA‐15, disordered 3D SBA‐15, and highly nonuniform silica fractions with mainly amorphous character. The fluoride‐induced disintegration of the silica structure under hydrothermal conditions was also verified by TEM. A direct influence of the structural adaption on the chemical properties of the surface was demonstrated by isopropanol conversion and H/D exchange monitored by FTIR analysis as sensitive probes for acid and redox active surface sites.

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Facile method to synthesize platelet SBA-15 silica with highly ordered large mesopores

Cited by 31 publications

References 47 publications

Novel Mesoporous Silica Materials with Hierarchically Ordered Nanochannel: Synthesis with the Assistance of Straight-Chain Alkanes and Application

Novel Mesoporous Silica Materials with Hierarchically Ordered Nanochannel: Synthesis with the Assistance of Straight-Chain Alkanes and Application

Mesoporous Building Blocks: Synthesis and Characterization of Mesoporous Silica Particles and Films

Transition from 2D to 3D SBA‐15 by High‐Temperature Fluoride Addition and its Impact on the Surface Reactivity Probed by Isopropanol Conversion

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