Synthesis of oligosiloxane Q2M6 [Q = (SiO4/2)4, M = Me3SiO2/3] from trimethylsilylation of complex silicates

Caudillo, G Martín; Pacheco, Carmen María Sandoval; Cervantes, Jorge

doi:10.1002/aoc.1070

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…Although muscovite was present, the resonance detected at −91.5 ppm was not assigned to this mineral due to the 4 ppm difference in chemical shift, and the lack of a companion resonance in the spectrum . It was believed to be generated, instead, by augite, known to produce a resonance – at −91.8 ppm. In TRSN, authigenic chabazite and phillipsite were the most abundant minerals detected by XPRD, and they were present together with sanidine, aegirine−augite, authigenic analcime, biotite, and leucite.…”

Section: Resultsmentioning

confidence: 99%

¹H, ²⁹Si, and ²⁷Al MAS NMR as a Tool to Characterize Volcanic Tuffs and Assess Their Suitability for Industrial Applications

2010

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The type and quality of the information provided by the direct analysis of volcanic tuffs by 1H, 29Si, and 27Al NMR were investigated. At this aim, five tuffs, characterized by different origin, bonding mechanism, and clast composition, were used as test materials. Results consistent with the different nature of the tuff matrix and mineral composition were obtained. While the relative content of Al in the crystal and amorphous phase was determined by 27Al MAS and 3Q MAS NMR, the prevalent glassy or zeolitic nature of the matrix was assessed by 29Si and 1H MAS NMR. Zeolites present at levels as low as 15% w/w were detected by 29Si MAS NMR, and in some tuffs, identification of their framework type was performed together with the determination of the Si/Al ratio and, for the first time, of their configurational entropy. Data obtained were coherent with those provided by X-ray fluorescence (XRF), X-ray powder diffraction (XPRD), thermogravimetric analysis (TGA), differential thermal gravimetry (DTG), cation exchange capacity (CEC) determinations, and scanning electron microscopy, used in both backscattering imaging mode (SEM) and for elemental analysis (SEM-EDS). Results show that, under favorable conditions, solid state NMR techniques can provide a comprehensive view of the chemical and physicochemical behavior of a tuff. A combined use of these techniques is suitable for characterization of tuffs on a routine basis, and can be particularly useful to decide if a material is suitable for industrial applications.

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Section: Resultsmentioning

confidence: 99%

¹H, ²⁹Si, and ²⁷Al MAS NMR as a Tool to Characterize Volcanic Tuffs and Assess Their Suitability for Industrial Applications

2010

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“…Obtaining MQ copolymers based on cheap natural starting compounds, especially silicates [48,49,50,51,52] and silicic acids and soluble (liquid) glass [53,54,55], which play the role of a tetrafunctional reagent, has been known for a long time and is being developed and used today.…”

Section: Resultsmentioning

confidence: 99%

“…Later study of trimethylsilylation of natural silicates resulted in obtaining Q 2 M 6 oligomer with high selectivity [49,51]. In this case such product was formed using different types of silicates—anorthite, labradorite, augite, different in structure and content of various metals.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and Properties of MQ Copolymers: Current State of Knowledge

2017

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In this review, we discuss currently available studies on the synthesis and properties of MQ copolymers. The data on methods of producing hydrolytic and heterofunctional polycondensation of functional organosilanes as well as the obtaining MQ copolymers based on silicic acids and nature silicates are considered. The ratio of M and Q monomers and the production method determine the structure of MQ copolymers and, accordingly, their physicochemical characteristics. It is shown that the most successful synthetic approach is a polycondensation of organoalkoxysilanes in the medium of anhydrous acetic acid, which reduces the differences in reactivity of M and Q monomers and leads to obtaining a product with uniform composition in all fractions, with full absence of residual alkoxy-groups. The current concept of MQ copolymers is that of organo-inorganic hybrid systems with nanosized crosslinked inorganic regions limited by triorganosilyl groups and containing residual hydroxyl groups. The systems can be considered as a peculiar molecular composites consisting of separate parts that play the role of a polymer matrix, a plasticizer, and a nanosized filler.

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La ruta de trimetilsililación para preparar sílice modificada con grupos mercapto y su empleo como adsorbente de arsénico de fuentes de agua

et al. 2019

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La trimetilsililación (TMS) es una reacción que ha sido empleada, entre otros usos, para la obtención de oligosiloxanos a partir de silicatos naturales. La modificación de las condiciones de reacción puede permitir la obtención de sílice con propiedades texturales interesantes (área superficial, tamaño y volumen de poro) -y lo que ha sido poco explorado y se propone en este estudio-, la obtención de sílice modificada con grupos orgánicos por una ruta relativamente simple en función de los reactivos usados y de las condiciones de la reacción. La sílice a modificar es obtenida in situ y modificada en el mismo medio de reacción, ahorrando varias etapas. En este estudio, se sintetizó sílice modificada con grupos mercapto. La caracterización del material se realizó por FT-IR, resonancia magnética nuclear (RMN) en estado sólido de 29Si y 13C, análisis térmico (DTG/DTA) y fisisorción de nitrógeno. El material se valoró como adsorbente para la remoción de arsénico de soluciones acuosas estándar (hasta de 1 ppm de arsénico), usando un sistema de adsorción por lotes, variando la temperatura en un intervalo entre 20 °C y 30 °C. Se encontró que la mayor capacidad de remoción se favorece a la menor temperatura, logrando hasta un 68% de remoción, valores similares a otros reportados.

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Synthesis of oligosiloxane Q₂M₆ [Q = (SiO_4/2)₄, M = Me₃SiO_2/3] from trimethylsilylation of complex silicates

Cited by 3 publications

References 8 publications

¹H, ²⁹Si, and ²⁷Al MAS NMR as a Tool to Characterize Volcanic Tuffs and Assess Their Suitability for Industrial Applications

¹H, ²⁹Si, and ²⁷Al MAS NMR as a Tool to Characterize Volcanic Tuffs and Assess Their Suitability for Industrial Applications

Synthesis and Properties of MQ Copolymers: Current State of Knowledge

La ruta de trimetilsililación para preparar sílice modificada con grupos mercapto y su empleo como adsorbente de arsénico de fuentes de agua

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Synthesis of oligosiloxane Q2M6 [Q = (SiO4/2)4, M = Me3SiO2/3] from trimethylsilylation of complex silicates

Cited by 3 publications

References 8 publications

1H, 29Si, and 27Al MAS NMR as a Tool to Characterize Volcanic Tuffs and Assess Their Suitability for Industrial Applications

1H, 29Si, and 27Al MAS NMR as a Tool to Characterize Volcanic Tuffs and Assess Their Suitability for Industrial Applications

Synthesis and Properties of MQ Copolymers: Current State of Knowledge

La ruta de trimetilsililación para preparar sílice modificada con grupos mercapto y su empleo como adsorbente de arsénico de fuentes de agua

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Synthesis of oligosiloxane Q₂M₆ [Q = (SiO_4/2)₄, M = Me₃SiO_2/3] from trimethylsilylation of complex silicates

¹H, ²⁹Si, and ²⁷Al MAS NMR as a Tool to Characterize Volcanic Tuffs and Assess Their Suitability for Industrial Applications

¹H, ²⁹Si, and ²⁷Al MAS NMR as a Tool to Characterize Volcanic Tuffs and Assess Their Suitability for Industrial Applications