Dimethyldiethoxysilane/tetraethoxysilane copolymers: precursors for the silicon-carbon-oxygen system

Babonneau, Florence; Thorne, K.; MacKenzie, J. D.

doi:10.1021/cm00005a017

Cited by 166 publications

(72 citation statements)

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“…The sol-gel process is an attractive synthetic approach to produce silicon oxycarbide glasses, as revealed by a number of studies published in this field. [170][171][172] The sol-gel technique can be applied for the synthesis of SiAlCO-precursors as well.…”

Section: Sieco Molecular Precursorsmentioning

confidence: 99%

Silicon-Based Polymer-Derived Ceramics: Synthesis Properties and Applications-A Review

Riedel

Mera

Hauser

et al. 2006

Nippon Seramikkusu Kyokai gakujutsu ronbunshi

408

316

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Section: Sieco Molecular Precursorsmentioning

confidence: 99%

Silicon-Based Polymer-Derived Ceramics: Synthesis Properties and Applications-A Review

Riedel

Mera

Hauser

et al. 2006

Nippon Seramikkusu Kyokai gakujutsu ronbunshi

408

316

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“…The chemical structure of these materials, therefore, contains Si atoms which are simultaneously bonded to carbon and oxygen atoms [1][2][3]. These glasses are best synthesized via a sol-gel process using alkyl-substituted alkoxysilane precursors.…”

Section: Introductionmentioning

confidence: 99%

Surface chemistry and structure of silicon oxycarbide gels and glasses

Singh

Pantano

1997

J Sol-Gel Sci Technol

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Abstract. In this study, the surface chemistry and structure of methyl-substituted silica gels and porous oxycarbide glasses were investigated. FTIR was used to measure the relative concentration of Si--CH3 and Si--OH as a function of the degree of methyl-substitution and the pyrolysis temperature. The gels and glasses were further heated, dehydrated or hydrated, in situ, within the FTIR spectrometer. In the temperature range of 800-850~ high surface area oxycarbide glasses were created with no detectable surface hydroxyl groups. Oxycarbide glasses synthesized in argon at 700~ displayed a weak band for surface hydroxyl groups and reversible physisorption of water, while those synthesized at 850/900~ showed a complete absence of surface hydroxyl groups and the formation of vicinal silanols upon chemisorption of water. Isolated silanols were observed upon heat treatment in vacuum. Formation of aromatic carbon species was found to correlate with the decomposition of the methyl groups. The oxycarbide surface is quite stable to densification (presumably due to elemental carbon on the pore surfaces). In the absence of oxygen, porous silicon oxycarbide glass powders maintain surface areas >200 m2/g at 1200~ However, oxidizing species in the atmosphere deplete the aromatic carbon species, and the glasses lose surface area.

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“…Condensation of organoalkoxysilanes has been reported in sol-gel science because of the wide diversity of properties that the resulting hybrid materials may offer [10][11][12] . They are typically co-condensed with alkoxysilanes to tailor the crosslinking of the resulting silica network [13][14][15][16][17][18] . However, co-condensation of siloxane precursors in the presence of silaffins remains underexplored and is unexplored in the living diatom.…”

mentioning

confidence: 99%

Functionalization of the living diatom Thalassiosira weissflogii with thiol moieties

et al. 2013

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Biomineralization processes identified within diatoms have inspired the design of synthetic silica structures in vitro using alkoxysilane precursors. Here we explore the use of the machinery within the living diatom to fabricate organo-silica constructs using a combination of alkoxysilane and organoalkoxysilane precursors. We report on the incorporation of thiol moieties into the diatom during frustule synthesis. Formation of valves within the parent diatom is monitored using fluorescence microscopy, and the modification of the chemical composition of the diatom is confirmed using energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy and 29 Si-nuclear magnetic resonance spectroscopy. Chemical modification is achieved without loss of the nano-scale architectural features of the frustule. Extension of this work may allow the chemistry of the diatom to be tailored during synthesis.

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Dimethyldiethoxysilane/tetraethoxysilane copolymers: precursors for the silicon-carbon-oxygen system

Cited by 166 publications

References 1 publication

Silicon-Based Polymer-Derived Ceramics: Synthesis Properties and Applications-A Review

Silicon-Based Polymer-Derived Ceramics: Synthesis Properties and Applications-A Review

Surface chemistry and structure of silicon oxycarbide gels and glasses

Functionalization of the living diatom Thalassiosira weissflogii with thiol moieties

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