نتایج جستجو برای: silicate hydrolysis
تعداد نتایج: 48714 فیلتر نتایج به سال:
We describe observations of 9.7 μm silicate features in 97 AGNs, exhibiting a wide range of AGN types and of X-ray extinction toward the central nuclei. We find that the strength of the silicate feature correlates with the HI column density estimated from fitting the X-ray data, such that low HI columns correspond to silicate emission while high columns correspond to silicate absorption. The be...
We present the first Spitzer Infrared Spectrograph 11 observations of the disks around classical T Tauri stars: spectra in the 5.2-30 µm range of six stars. The spectra are dominated by emission features from amorphous silicate dust, and a continuous component from 5 to 8 µm that in most cases comprises an excess above the photosphere throughout our spectral range. There is considerable variati...
Dispersion of the silicate nano-plates of clays within polymers for nanocomposite formation generally involved interactions of the polymers with the plate surfaces. In this paper, we provide preliminary evidence showing dependency of the dispersion on the interactions of the plate lattices with polymers. Experiments have been carried out on the dispersion of the natural clay, montmorillonite (E...
During the past decade, tremendous attention has been given to the development of new electrode materials with high capacity to meet the requirements of electrode materials with high energy density in lithium ion batteries. Very recently, cobalt silicate has been proposed as a new type of high capacity anode material for lithium ion batteries. However, the bulky cobalt silicate demonstrates lim...
This study assesses the quantitative effects of incorporating high-volume fly ash (HVFA) into tricalcium silicate (C₃S) paste on the hydration, degree of silicate polymerization, and Al substitution for Si in calcium silicate hydrate (C-S-H). Thermogravimetric analysis and isothermal conduction calorimetry showed that, although the induction period of C₃S hydration was significantly extended, t...
The structure of weeksite, K1.26Ba0.25Ca0.12[(UO2)2(Si5O13)]H2O, orthorhombic, a 14.209(2), b 14.248(2), c 35.869(4) Å, V 7262(2) Å3, space group Cmmb, has been solved by direct methods using data collected with MoK X-radiation and a CCDbased detector and refined by full-matrix least-squares techniques, on the basis of F2 for all unique reflections, to an agreement factor (R1) of 7.0% and a goo...
The Open University's repository of research publications and other research outputs The production of platinum-coated silicate nanoparti-cle aggregates for use in hypervelocity impact experiments Journal Article (2009). The production of platinum-coated silicate nanoparticle aggregates for use in hypervelocity impact experiments. Copyright and Moral Rights for the articles on this site are ret...
The objective of the present study was to investigate the use of propranolol-magnesium aluminium silicate intercalated complexes as drug reservoirs in hydroxypropylmethylcellulose tablets. The matrix tablets containing the complexes were prepared and characterised with respect to propranolol release and were subsequently compared with those loading propranolol or a propranolol-magnesium alumini...
Field observations were carried out in the East China Sea (ECS) in October 2000, May 2001 and April–May 2002. Biogenic silica (BSi) in core sediments, sediment traps, and suspended particulate matter (SPM) was measured; silicate profiles in pore waters were examined. The concentration of BSi in SPM was high in coastal areas. The content of BSi in ECS sediments is less than 1%, as the result of ...
The present study describes for the first time the synthesis of silica nanoparticles starting from sodium silicate and oleic acid (OLA). The interactions between OLA and sodium silicate require an optimal OLA/OLANa molar ratio able to generate vesicles that can stabilize silica particles obtained by the sol-gel process of sodium silicate. The optimal molar ratio of OLA/OLANa can be ensured by a...
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