Trimethylsilyl derivatives for the study of silicate structures. Part I. A direct method of trimethylsilylation

Götz, J.; Masson, C. R.

doi:10.1039/j19700002683

Cited by 70 publications

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“…That result led Herasymenko to formulate the basics of the ionic theory. This finding has been supported by the chromatographic separation of different polymeric silicate anions dissolved in aqueous solutions . According to that theory, liquid slags are composed of: (1) cations such as Ca 2+ and Fe 2+ (2) anions such as O 2− and S 2− , and (3) anion complexes such as SiO 4 4− , AlO 4 5− , and PO 4 3− .…”

Section: Introductionmentioning

confidence: 70%

Analysis of Slag Chemistry by FTIR‐RAS and Raman Spectroscopy: Effect of Water Vapor Content in H₂H₂OCOCO₂ Mixtures Relevant to a Novel Green Ironmaking Technology

Mohassab

Sohn

2014

steel research int.

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In an effort to develop a novel green ironmaking process with the potential of steelmaking in a single continuous process the chemistry of selected slag systems were investigated. The novel process uses gaseous fuels and reductants that help reduce energy consumption and minimize greenhouse gas emissions. Amongst the proposed reductants and fuels are H2, natural gas (NG), and coal gas (CG). In different ironmaking processes, the molten bath (iron–slag bath) is expected to be at equilibrium with gas atmospheres of mainly H2/H2O, and CO/CO2/H2/H2O corresponding to the use of H2 and NG/CG, respectively. CO/CO2 gas mixture was studied for comparison. Based on the FTIR‐RAS (reflection absorption spectroscopy) and Raman analyses, it is expected that H2O stabilizes the more polymerized silicates anions rather than the depolymerized monomers. For the investigated slag compositions, slags under H2 and NG/CG at 1550 °C had values of ψ = (Q0 + Q1)/(Q2 + Q3) (a measure of depolymerization) 75 and 55 less than slags under the CO/CO2 atmosphere. It was concluded that the higher the water content in the gas atmosphere the more polymerized the silicates in the slag. The results of this study will, for the first time, provide new insights into the slag chemistry under H2O containing atmospheres.

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Section: Introductionmentioning

confidence: 70%

Analysis of Slag Chemistry by FTIR‐RAS and Raman Spectroscopy: Effect of Water Vapor Content in H₂H₂OCOCO₂ Mixtures Relevant to a Novel Green Ironmaking Technology

Mohassab

Sohn

2014

steel research int.

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“…In the majority of organic solvents, that is chloroform, toluene, benzene, diethyl ether, etc., the products were organophilic to the extent that they swelled to form gels. For example, 1.OOg of 1/83 swelled in chloroform solvent (25.00 g) to produce a gel (1450 8).…”

Section: Modified Trimeth Ylsilylation Methods (I)mentioning

confidence: 99%

An investigation into the preparation of polyorganosiloxane materials from olivine

Bains

Kendrick

Parsonage

1993

Polymer International

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Modification of the Lentz trimethylsilylation technique was used to synthesize QxMy and QxMy(OH)2 polyorganosiloxanes from olivine (Q = SiO4/2, M = (Me3SiO1/2). The products ranged from viscous mobile liquids to hydrophobic insoluble solids with a molecular weight distribution between 3 × 103 and 400 × 103 depending on the time of addition of silylating agent, hexamethyldisiloxane (MM), to the preformed silicic acids. The stabilisation of the silicic acids leached from olivine was controlled by varying the period of silicic acid condensation‐polymerisation reactions and their solution concentration. The absence of the phase transfer agent propan‐2‐ol from the modified trimethylsilylation reaction resulted in the formation of silica gel. Propan‐2‐ol, by associating with silicic acids leached from olivine, produced a stable pre‐polymer suspension consisting of partially capped silicic acids.

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“…A highly branched slag would presumably be fairly viscous and be readily quenched to a glass. In spite of the failure to achieve a homogeneous glass, a sample of quenched cobalt silicate was analyzed by a gas-liquid partition chromatography technique (15,16). The result is shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

Activities and Ionic Distributions in Cobalt Silicate Melts

Smith¹,

Masson²

1971

Can. J. Chem.

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Activities of COO in COO-SiOZ melts were measured at 145W1500 "C by equilibrating the melts, held in Pt-Rh containers, with atmospheres of known oxygen potential. Activities were calculated by the relationship where ac., the activity of cobalt in the container, was determined in separate experiments.The results were compared with theoretical activity~omposition curves based on the application of polymer theory to silicate melts. The results were in good agreement with theoretical curves calculated on the assumption of linear chains. In contrast, for all other binary silicate melts so far investigated the results are best represented in terms of theory in which all chain configurations are allowed. Ionic distributions and number average and weight average molecular weights were calculated as functions of the silica content from the experimental data. The calculated proportions of monomeric ion, SiOd4-, dimer SiZ076-, and trimer Si3010s-were in reasonable agreement with experimental values based on trimethylsilylation and gas-chromatographic separation of the ionic constituents in quenched melts.On a mesure I'activite de COO dans des melanges fondus COO-SiOZ en Cquilibre avec des atmospheres d'oxygtne de potentiel connu, dans des recipients de Pt-Rh, a 1450-1500 "C. Les activitts ont e t t calculees a I'aide de la relation oh a,,, I'activitk du cobalt dans le recipient, a ete determinee i partir de mesures sCparCes.Les resultats sont compares aux courbes thkoriques activite-composition ttablies en appliquant la theorie des polymeres aux silicates fondus. Ils sont en bon accord avec les courbes thtoriques etablies en supposant que I'on a affaire a des chaines lineaires. Par contre, les resultats obtenus pour tous les autres silicates binaires Ctudies jusqu'a present se montrent en meilleur accord avec les courbes thtoriques Ctablies en supposant toutes les configurations possibles pour les chaines. La distribution des ions ainsi que les masses molCculaires moyennes en nombre et en poids ont e t t calcultes en fonction de la teneur en silice. Les proportions calcultes des monomeres ioniques SiOd4-, dimkres SiZ076-et trimeres Si3010s-presentent un accord raisonnable avec les valeurs experimentales obtenues de la trimethylsilylation et de la separation par chromatographie en phase gazeuse des constituants ioniques dans les silicates trempes.

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Trimethylsilyl derivatives for the study of silicate structures. Part I. A direct method of trimethylsilylation

Cited by 70 publications

References 0 publications

Analysis of Slag Chemistry by FTIR‐RAS and Raman Spectroscopy: Effect of Water Vapor Content in H₂H₂OCOCO₂ Mixtures Relevant to a Novel Green Ironmaking Technology

Analysis of Slag Chemistry by FTIR‐RAS and Raman Spectroscopy: Effect of Water Vapor Content in H₂H₂OCOCO₂ Mixtures Relevant to a Novel Green Ironmaking Technology

An investigation into the preparation of polyorganosiloxane materials from olivine

Activities and Ionic Distributions in Cobalt Silicate Melts

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Trimethylsilyl derivatives for the study of silicate structures. Part I. A direct method of trimethylsilylation

Cited by 70 publications

References 0 publications

Analysis of Slag Chemistry by FTIR‐RAS and Raman Spectroscopy: Effect of Water Vapor Content in H2H2OCOCO2 Mixtures Relevant to a Novel Green Ironmaking Technology

Analysis of Slag Chemistry by FTIR‐RAS and Raman Spectroscopy: Effect of Water Vapor Content in H2H2OCOCO2 Mixtures Relevant to a Novel Green Ironmaking Technology

An investigation into the preparation of polyorganosiloxane materials from olivine

Activities and Ionic Distributions in Cobalt Silicate Melts

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Product

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Analysis of Slag Chemistry by FTIR‐RAS and Raman Spectroscopy: Effect of Water Vapor Content in H₂H₂OCOCO₂ Mixtures Relevant to a Novel Green Ironmaking Technology

Analysis of Slag Chemistry by FTIR‐RAS and Raman Spectroscopy: Effect of Water Vapor Content in H₂H₂OCOCO₂ Mixtures Relevant to a Novel Green Ironmaking Technology