A new example of periodic mesoporous SiCO glasses with cubic symmetry stable at 1000.DEG.C

Pauletti, Alberto; Handjani, Soraya; Fernandez-Martin, Cristina; Gervais, Christel; Babonneau, Florence

doi:10.2109/jcersj2.116.449

Cited by 22 publications

(21 citation statements)

References 33 publications

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“…Pauletti et al have synthesized an ordered mesoporous SiOC starting from periodic mesoporous organosilica (PMO) precursors. 8 In the latter case, the PMO network has been obtained via sol-gel reaction from bis-triethoxysilylethane in the presence of a surfactant. Meso/macroporous silicon oxycarbide glasses have also been reported from pyrolysis of porous hybrid silica xerogels 9-11 and aerogels.…”

Section: Introductionmentioning

confidence: 99%

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Controlled Mesoporosity in SiOC via Chemically Bonded Polymeric “Spacers”

et al. 2013

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Silicon oxycarbides with controlled porosity in the mesopore range have been obtained through high-temperature pyrolysis of newly developed reactive siloxane formulations. The starting gels have been synthesized via Pt catalyzed hydrosilylation reaction between polyhydromethylsiloxane (PHMS) and vinyl-terminated polydimethylsiloxane (PDMS) of different molecular weights in the presence of tetravinyltetramethylcyclotetrasiloxane as a crosslinking enhancer. In our approach, the PDMS serves the double purpose of size-controlling templating agent as well as solvent at the early stages of the synthesis. During the curing step, the vinyl-terminated PDMS is chemically bonded to the preceramic network through the extremely efficient hydrosilylation reaction and "solidify." Accordingly, its removal during pyrolysis occurs through decomposition of a solid phase with retention of the formed porosity. The structural and morphological evolution of the preceramic gels containing the molecular spacers have been investigated as a function of the thermal treatment temperature by N 2 physisorption measurements, thermogravimetry, and SEM analyses. The results show that the pore size distribution of the resulting SiOCs depends on the molecular weight of the PDMS and is directly related to the molecular volume assumimg that the PDMS chains are entangled into spheroidal shapes. The total pore volume is related to the initial amount of templating PDMS assuming its complete decomposition during pyrolysis.

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Section: Introductionmentioning

confidence: 99%

“…Pauletti et al . have synthesized an ordered mesoporous SiOC starting from periodic mesoporous organosilica (PMO) precursors . In the latter case, the PMO network has been obtained via sol–gel reaction from bis‐triethoxysilylethane in the presence of a surfactant.…”

Section: Introductionmentioning

confidence: 99%

Controlled Mesoporosity in SiOC via Chemically Bonded Polymeric “Spacers”

et al. 2013

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“…This lack of accessibility could be due to incompletely removed surfactant (see 13 C NMR). However, in the precipitated sample in which F127 is also partially removed [10], a much higher S BET is observed. Another hypothesis can be proposed based on the observation of a denser layer around the particles on the TEM micrographs.…”

Section: Characterization Of Surfactant-extracted Pmo Particlesmentioning

confidence: 92%

Aerosol-generated mesoporous silicon oxycarbide particles

Pauletti

Moskowitz

Millan

et al. 2009

Pure and Applied Chemistry

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Aerosol-generated mesoporous organosilica submicronic spheres have been converted into porous silicon oxycarbide (SiCO) glasses by pyrolysis at 1000 °C in an inert atmosphere. Spherical mesoporous particles obtained from acidic solutions of 1,2-bis(triethoxysilyl)ethane and Pluronic ® F127 structuring agent were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), N 2 adsorption/desorption, and multi nuclear solid-state magic-angle spinning (MAS) NMR. These particles were then pyrolyzed at 1000 °C and transformed into a SiCO phase as evidenced by 29 Si MAS NMR, while TEM shows preserved mesoporosity, unfortunately difficult to access owing to the presence of an outer layer of dense silica.

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“…Mesoporous materials have regularly ordered mesopore arrangements, a narrow pore-size distribution, and a very high surface area. Various types of mesoporous materials, including films, 2)-3) fibers, particles, 4) and monoliths, 5) have been synthesized and have been used in a wide range of applications such as adsorption systems, sensors, catalyzers, separators, and drug-delivery systems.…”

Section: Introductionmentioning

confidence: 99%

Industrial mass-production of mesoporous silica spherical particles by a spray-drying process: investigation of synthetic conditions

Yamauchi

Gupta

Sato

et al. 2009

J. Ceram. Soc. Japan

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A spray-drying process was applied to the mass-production of mesoporous silica particles. The applied nozzle pressure and amount of solvent in the precursor solution were varied to control the average particle size. The particle-size distribution showed a bell curve with a normal distribution. As the nozzle pressure was increased from 0.05 to 0.20 MPa, the average particle size was decreased proportionally. In addition, as the surfactant concentrations in the precursor solutions were decreased, the average particle size was decreased. Based on the results of low-angle X-ray diffraction measurements, N2 adsorption measurements, and TEM observations, it was proven that well-ordered mesoporous structures were formed inside the particles. It is proved that the spray-drying conditions do not affect the mesoporous structures but do affect the average particle size.

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A new example of periodic mesoporous SiCO glasses with cubic symmetry stable at 1000.DEG.C

Cited by 22 publications

References 33 publications

Controlled Mesoporosity in SiOC via Chemically Bonded Polymeric “Spacers”

Controlled Mesoporosity in SiOC via Chemically Bonded Polymeric “Spacers”

Aerosol-generated mesoporous silicon oxycarbide particles

Industrial mass-production of mesoporous silica spherical particles by a spray-drying process: investigation of synthetic conditions

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