Journal ArticleDOI
Effect of surfactant/silica molar ratios on the formation of mesoporous molecular sieves : inorganic mimicry of surfactant liquid-crystal phases and mechanistic implications
James C. Vartuli,Kirk D. Schmitt,Charles T. Kresge,Wieslaw J. Roth,M. E. Leonowicz,S. B. McCullen,S. D. Hellring,Jeffrey S. Beck,J. L. Schlenker +8 more
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TLDR
The influence of surfactant/silica molar ratio (Sur/Si) in the synthesis of mesoporous molecular sieve materials (M41S) was studied in a simple ternary synthesis system containing tetraethylorthosilicate (TEOS), water, and the cetyltrimethylammonium (CTMA) cation at 100{degrees}C as discussed by the authors.Abstract:
The influence of surfactant/silica molar ratio (Sur/Si) in the synthesis of mesoporous molecular sieve materials (M41S) was studied in a simple ternary synthesis system containing tetraethylorthosilicate (TEOS), water, and the cetyltrimethylammonium (CTMA) cation at 100{degrees}C. The resulting silicate materials were characterized by X-ray diffraction, {sup 29}Si NMR, and FTIR. As the Sur/Si molar ratio increased from 0.5 to 2, the siliceous products obtained could be classified into four separate groups: MCM-41 (hexagonal), MCM-48 (cubic), thermally unstable M41S, and a molecular species, the cubic octamer [(CTMA)SiO{sub 2.5}]{sub 8}. One of the thermally unstable structures has been identified as a lamellar phase. These results are consistent with known micellar phase transformations that occur at various surfactant concentrations and reinforce the concept that liquid-crystal structures serve as templating agents for the formation of M41S type materials. 48 refs., 13 figs., 5 tabs.read more
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Gas adsorption characterization of ordered organic-inorganic nanocomposite materials
Michal Kruk,Mietek Jaroniec +1 more
TL;DR: A critical review of adsorption methods that are currently used in the characterization of ordered organic−inorganic nanocomposite materials is presented in this paper, where the authors compare and evaluate the available methods for mesopore size analysis.
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Ordered mesoporous materials in catalysis
Akira Taguchi,Ferdi Schüth +1 more
TL;DR: In this paper, a review of the preparation of ordered mesoporous catalysts is presented, and the essential properties of the resulting materials are described in the first part of this review.
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TL;DR: In this article, the molecular shapes of covalent organosilanes, quaternary ammonium surfactants, and mixed surfactant in various reaction conditions can be used to synthesize silica-based mesophase configurations.
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A Review: Fundamental Aspects of Silicate Mesoporous Materials
TL;DR: Silicate mesoporous materials have received widespread interest because of their potential applications as supports for catalysis, separation, selective adsorption, novel functional materials, and use as hosts to confine guest molecules, due to their extremely high surface areas combined with large and uniform pore sizes.
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Ordered Mesoporous Materials for Bioadsorption and Biocatalysis
TL;DR: A growing field of amino acids, vitamins, enzymes, and whole cells adsorbed (immobilized) onto ordered mesoporous silica and carbon molecular sieves has attracted considerable attention over the past few years as discussed by the authors.