Silicon Compounds, Silanes

Arkles, Barry

doi:10.1002/0471238961.1909120101181112.a01

Cited by 77 publications

(110 citation statements)

References 95 publications

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“…Next, we extend our study to the family of the larger hexahydrides of formula E 2 H 6 (E = C – Pb). Ethane, disilane and digermane have been synthesized and characterized as gases at room temperature . Distannane and diplumbane are hypothetical molecules that have been theoretically studied .…”

Section: Computational Analysismentioning

confidence: 99%

Intermolecular interactions in group 14 hydrides: Beyond CH···HC contacts

2017

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In line with previous work in which we established the factors that enhance attractive CH···HC dihydrogen interactions in alkanes, an extended theoretical analysis of noncovalent intermolecular interactions in group 14 hydrides is presented here. Remarkably, these weak interactions may play a major role in determining the crystal structures adopted by several families of molecules. A combined structural and computational analysis at the MP2 level allowed us to identify and characterize different interactions of the type EH···HE and E···HE (E = Si, Ge, Sn, and Pb), and to find also the most suitable scenario for the establishment of each particular type. The nature of the interactions has been analyzed in terms of natural charges of the atoms involved and a topological analysis of the electron density of several dimers confirms the existence of H···H and H···E attractive contacts. We have observed that the interaction strength increases when descending down the periodic group and that silicon has a marked tendency to establish Si···HSi interactions. A size‐dependent backbone effect that reinforces H···H dihydrogen interactions in polyhedral systems has also been found.

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Section: Computational Analysismentioning

confidence: 99%

Intermolecular interactions in group 14 hydrides: Beyond CH···HC contacts

2017

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“…80°C 8 mmHg, flashpoint 83°C), bis-(3-trimethoxysilyl)propyletylenediamine (BPEA from ABCR, Karlsruhe, Germany, 62% in methanol, flashpoint 11°C), and tris-(3-trimethoxysilylpropyl)isocyanurate (TPCY from ABCR, Karlsruhe, Germany, purum 95%, flashpoint 102°C) 30 were used without further purification. The silane amount was measured and rapidly moved to 25-ml polyethylene bottles, followed by the addition of 50 vol.% ethanol (Ethanol Anhydricum, Primalco, Helsinki, Finland, >99.5%) solution with deionized grade I water of electrical resistivity 18.6 M Ð cm.…”

Section: Experimental Aminosilanesmentioning

confidence: 99%

Characterization of siloxane films on titanium substrate derived from three aminosilanes

Matinlinna

Areva

Lassila

et al. 2004

Surface & Interface Analysis

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The aim of this investigation was to study the siloxane, -Si-O-Si-, film formation on Ti substrate by using mono-, bis-and tris-aminosilanes. The ultimate goal was to obtain a smooth, well-organized and stable siloxane film with suitable surface energy. Such films are expected to perform well in adhering resins to dental metal alloys when the films contain reactive functional groups. Aminosilanes were prepared as 0.5 vol.% solutions in dilute ethanol (50 vol.% ethanol in deionized water), with their natural pH of ∼9. The substrates were silanized in two ways: silane was allowed to react at room temperature or was cured for 1 h at 110• C. The surface characterization was carried out by reflectance-absorbance Fourier transform infrared spectroscopy (RA-FTIR), x-ray photoelectron spectroscopy (XPS), contact angle measurement and atomic force microscopy (AFM). Siloxane film thickness measurements were not made. According to spectral analysis, all silanes indicated covalent bond formation with titanium. Si-O-Ti and Si-O-Si bonds were clearly seen in the spectra, suggesting that chemical retention had taken place. After curing at elevated temperature, the spectral bands seemed to be stronger than those on samples cured at room temperature. Curing of hydrolyzed silanes at elevated temperature seemed to enhance the siloxane layer formation, derived from aminosilanes, on the Ti substrate. This might have an influence on the hydrolytic stability of organosilane-promoted adhesion between Ti and dental resins.

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“…Based on the chemical bonding theory, the synthetic functionalized ionic liquids contain two different chemical functional groups, of which one can react with silanol groups on the surface of the inorganic material (such as metal oxides, inorganic salts, glass fibers, silicates) and the other can further participate in other reactions, so that the two kinds of materials with very different properties can be ''coupled'' together. Based on Arkles theory, the process consisted of a four-step reaction (Arkles 1977). The specific reaction mechanism is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Abrasion properties of self-suspended hairy titanium dioxide nanomaterials

et al. 2017

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Considering the excellent solubility of pyrrolidone ring organic compounds, the synthesized N-(trimethoxysilyl) propyl-N-methyl-2-pyrrolidone chlorides was tethered onto titanium dioxide (TiO 2 ) nanoparticles to improve dispersion of TiO 2 , and then polyethylene oxide (PEO) oligomer through ion exchange embraced the tethered TiO 2 to obtain a novel self-suspended hairy TiO 2 nanomaterials without any solvent. A variety of techniques were carried out to illustrate the structure and properties of the self-suspended hairy TiO 2 nanomaterials. It was found that TiO 2 nanoparticles embody monodispersity in the hybrid system though the ''false reunion'' phenomenon occurring due to nonpermanent weak physical cross-linking. Remarkably, self-suspended hairy TiO 2 nanomaterials exhibit lower viscosity, facilitating maneuverable and outstanding antifriction and wear resistance properties, due to the synergistic lubricating effect between spontaneously forming lubricating film and nano-lubrication of TiO 2 cores, overcoming the deficiency of both solid and liquid lubricants. This make them promising candidates for the micro-electromechanic/nano-electromechanic systems (MEMS/NEMS).

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Silicon Compounds, Silanes

Cited by 77 publications

References 95 publications

Intermolecular interactions in group 14 hydrides: Beyond CH···HC contacts

Intermolecular interactions in group 14 hydrides: Beyond CH···HC contacts

Characterization of siloxane films on titanium substrate derived from three aminosilanes

Abrasion properties of self-suspended hairy titanium dioxide nanomaterials

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