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Articoli di riviste sul tema "Silicates"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 25 luglio 2025

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1

Wooden, Diane H. "Cometary Silicates: Interstellar and Nebular Materials." Highlights of Astronomy 13 (2005): 495–97. http://dx.doi.org/10.1017/s1539299600016403.

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AbstractEvidence for interstellar material in comets is deduced from IR spectra, in situ measurements of Comet Halley, and chondritic porous interplanetary dust particles (CP IDPs). IR spectra of comets reveal the spectrally active minerals: amorphous carbon, amorphous silicates, and (in some comets) crystalline silicates. Evidence suggests amorphous silicates are of interstellar origin while crystalline silicates are of nebular origin.10 μm spectra of comets and sub-micron amorphous silicate spherules in CP IDPs have shapes similar to absorption spectra through lines-of-sight in the ISM. Ther
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2

Niciu, H., Dorel Radu, C. Onose, et al. "The Permanently Bonded Glass Decor from Chemical Precursors." Advanced Materials Research 39-40 (April 2008): 579–82. http://dx.doi.org/10.4028/www.scientific.net/amr.39-40.579.

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Abstract (sommario):
Alkaline earth metal silicates as well as many polyvalent metals silicates can be obtained through aqueous solutions reactions between an alkaline silicate solution and the solutions of metal salts. The vitrifiation of the oxide compositions, established by the necessary molar ratios for the projected glass, is realised by calculating the concentration of chemical precursors, through their reaction directly on the substrate. The sodium silicate viscosity in aqueous solution and the viscosity of nitrogenated compounds or oxalates necessary in the silicates synthesis is compatible with the neces
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3

Heckmann, W., F. Ramsteiner, and Ch Mehler. "Morphology of Poly Amide Nanocomposites Characterized by Transmission Electron Microscopy (TEM) and Electron Spectroscopic Imaging (ESI)." Microscopy and Microanalysis 7, S2 (2001): 502–3. http://dx.doi.org/10.1017/s1431927600028580.

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The introduction of organophilic layered silicates into a polyamide matrix significantly improves stiffness and strength [1,2]. Two methods are known to prepare such nanocomposites. For both methods cations such as sodium, potassium, magnesium or calcium, located in the interlayer galleries of the layered silicates must be exchanged by quaternary alkyl ammonium ions containing at least one alkyl chain and so rendering the originally hydrophilic into an organophilic silicate. in the insitu-method monomeric caprolactam is intercalated between the modified silicate interlayers and subsequently po
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4

Kemmitt, T., and NB Milestone. "The Ring Size Influence on 29Si N.M.R. Chemical Shifts of Some Spirocyclic Tetra- and Penta-coordinate Diolato Silicates." Australian Journal of Chemistry 48, no. 1 (1995): 93. http://dx.doi.org/10.1071/ch9950093.

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A series of tetracoordinate spirocyclic silicates has been prepared from the reaction of a range of diols with tetraethoxysilane, Si ( OEt )4. The silicates can be converted into anionic pentacoordinate silicates by reaction with KOBut/18-crown-6 in toluene. Alternatively, the pentacoordinate spirocycles can be prepared directly without prior preparation of a tetracoordinate spiro silicate. 29Si n.m.r. studies have demonstrated that the chemical shifts are sensitive to both coordination number and ring size. Ring contributions to the 29Si chemical shifts are apparent for the five- membered rin
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5

Molster, F. J. "Astromineralogy: Crystalline silicates." Symposium - International Astronomical Union 209 (2003): 291–98. http://dx.doi.org/10.1017/s0074180900208796.

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Silicates are the most abundant dust component in our Universe. For a long time it was generally assumed that around evolved stars only amorphous silicates were present. The infrared space observatory (ISO; Kessler et al. 1996) discovered that the abundance of crystalline silicates can be quite significant. Thanks to ISO it is now for the first time possible to determine the exact chemical composition of the silicates, and in contrast to the amorphous silicates, the crystalline silicates turned out to be very Fe-poor (i.e. forsterite and enstatite). Careful investigations of the spectra of cry
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6

Lii, Kwang-Hwa. "High-T, High-P Hydrothermal Synthesis of Uranium Silicates and Germanates." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C759. http://dx.doi.org/10.1107/s2053273314092407.

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Most uranium minerals can be classified as oxidized species in which U is fully oxidized to U(VI), and reduced species, in which U occurs primarily as U(IV). Uranyl silicates are an important group of uranium(VI) minerals in the altered zones of many uranium deposits [1]. Uranyl silicates have also received attention because they form when spent nuclear fuel interacts with water containing silicon under oxidizing conditions. One naturally occurring uranium(IV) silicate exists, namely coffinite (USiO4), which is the most important ore mineral for uranium after uraninite. Numerous synthetic uran
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7

Liang, Jian-Jie, Alexandra Navrotsky, Thomas Ludwig, Hans J. Seifert, and Fritz Aldinger. "Enthalpy of Formation of Rare-earth Silicates Y2SiO5 and Yb2SiO5 and N-containing Silicate Y10(SiO4)6N2." Journal of Materials Research 14, no. 4 (1999): 1181–85. http://dx.doi.org/10.1557/jmr.1999.0158.

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Abstract (sommario):
The enthalpies of formation of two rare-earth silicates (Y2SiO5 and Yb2SiO5) and a N-containing rare-earth silicate Y10(SiO4)6N2 have been determined using high-temperature drop solution calorimetry. Alkali borate (52 wt% LiBO2·48 wt% NaBO2) solvent was used at 800 °C, and oxygen gas was bubbled through the melt. The nitrogen-containing silicate was oxidized during dissolution. The standard enthalpies of formation are for Y2SiO5, Yb2SiO5, and Y10(SiO4)6N2, respectively, –22868.54 ± 5.34, –22774.75 ± 8.21, and –14145.20 ± 16.48 kJ/mol from elements, and –52.53 ± 4.83, –49.45 6 ± 8.35, and –94.5
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8

P. C. Bennett, J. R. Rogers, W. J. "Silicates, Silicate Weathering, and Microbial Ecology." Geomicrobiology Journal 18, no. 1 (2001): 3–19. http://dx.doi.org/10.1080/01490450151079734.

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9

Iliushchenko, V., L. Kalina, P. Hruby, et al. "The treatment of cementitious surface by selected silicate sealers." Journal of Physics: Conference Series 2341, no. 1 (2022): 012003. http://dx.doi.org/10.1088/1742-6596/2341/1/012003.

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Over the past decades, the efficiency of the silicate-based surface treatment agents, in other words, sealers, in concrete systems has been widely investigated. The surface treatment technology protects the cementitious systems against the penetration of undesirable substances. Nevertheless, understanding of the several aspects concerning silicate-based sealers is not entirely clear. This paper studies the action mechanism of selected silicates such as potassium, sodium, lithium water glasses, and colloidal silica. The effectiveness of used sealers in terms of water absorption reduction, the a
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10

Jakobsen, U. H. "A hydrated barium silicate in unmetamorphosed sedimentary rocks of central North Greenland." Mineralogical Magazine 54, no. 374 (1990): 81–89. http://dx.doi.org/10.1180/minmag.1990.054.374.08.

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AbstractA new occurrence of barium silicates has been found in unmetamorphosed sedimentary rocks of central North Greenland. Two different barium minerals have been identified, the Ba-feldspar hyalophane, and an unknown and hitherto undescribed hydrated Ba-silicate with an anhydrous chemical composition identical to cymrite but with about 4 moles of water in the mineral structure. Both silicates are found in a black organic-rich chert sequence in close association with baryte. No replacement textures are observed between the three Ba-minerals.The hydrated Ba-silicate in the unmetamorphosed roc
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11

Baraček, Jan, Martin Palou, Jiří Másilko, et al. "Application of Sol-Gel Method to Investigate the Influence of P2O5 on the Course of Reactions in CaO-SiO2 System." Materials Science Forum 851 (April 2016): 92–97. http://dx.doi.org/10.4028/www.scientific.net/msf.851.92.

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The effect of P2O5 addition on the calcium silicate phase equilibrium during the sol-gel synthesis of dicalcium silicate was investigated using Scanning electron microscope and X-ray diffraction. It is established that phosphorous oxide can form solid solution with dicalcium silicate, but its causes the formation of phosphatic calcium silicate phases such as Ca14.92 (PO4)2.35(SiO4)5.65 and 5CaO.SiO2.P2O5 also. Local analysis has demonstrated the presence of calcium phosphate epicenters containing silicon oxide and calcium silicate zones with minimum content of phosphorous oxide and intermediar
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12

Shoshin, Evgeniy, Valeria Strokova, Denis Timokhin, and Alexandr Strakhov. "Effect of Calcium Synthetic Hydro Silicate Additives on the Cement Systems’ Technological Characteristics." Materials Science Forum 1011 (September 2020): 59–65. http://dx.doi.org/10.4028/www.scientific.net/msf.1011.59.

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The use of finely dispersed fillers for cement concrete is accompanied not only by the cement binder saving, but also by a change in the technological characteristics of the cement mixtures. Depending on the nature of the additive used, both a positive and a negative water-reducing effect can be observed. The nature of the synthetic calcium silicates additives’ effect obtained by the method of sucrose-modified calcium hydro silicates thermolysis on the technological properties of the cement systems is considered. The independent methods determined the polymodal nature of the calcium silicates
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13

Kozasa, Takashi, and Hisato Sogawa. "Formation of crystalline silicate around oxygen–rich AGB stars." Symposium - International Astronomical Union 191 (1999): 239–44. http://dx.doi.org/10.1017/s0074180900203124.

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Crystallization of silicate has been investigated within the framework of dust formation in steady state gas outflows around oxygen–rich AGB stars, where silicates are locked not only into homogeneous silicate grains but also into the mantles of heterogeneous grains. Based on the thermal history of dust grains after their formation, the crystallization calculation results in no crystalline silicate for the mass loss rate Ṁ ≤ 2 × 10−5M⊙ yr−1. Only silicate in the mantles of heterogeneous grains can be crystallized for Ṁ ≥ 3 × 10−5M⊙ yr−1, while homogeneous silicate grains remain amorphous. The
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14

Vedyakov, Ivan, Vladimir Vaskalov, Nikolai Maliavski, and Mikhail Vedyakov. "Highly Efficient Glass Ceramic Thermal Insulation." E3S Web of Conferences 263 (2021): 01017. http://dx.doi.org/10.1051/e3sconf/202126301017.

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Alkali-silicate thermal insulation materials (foam silicates) belong to the group of mineral heat insulators. Their main disadvantage is insufficient water resistance, to increase which special water-strengthening additives are introduced into materials. The aim of this work was to obtain and study foam silicates in granular (FGCG) and slab (FGCS) forms using a new production technology characterized by a simple one-stage technological scheme. Natural or technogenic amorphous silica, glassy sodium silicate (with the addition of carbonate or hydroxide) and a carbon-containing foaming agent, wer
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15

Borrmann, Thomas, Anton Dominis, Andrew J. McFarlane, et al. "Immobilisation of Fully Sulfonated Polyaniline on Nanostructured Calcium Silicate." Journal of Nanoscience and Nanotechnology 7, no. 12 (2007): 4303–10. http://dx.doi.org/10.1166/jnn.2007.879.

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Up to 7.4% (w/w) of the sulfonated polyaniline, poly(2-methoxyaniline-5-sulfonic acid) (PMAS) can be absorbed onto nanostructured calcium silicates. Spectroscopic and leaching studies on the novel PMAS-silicate nanocomposites obtained indicate that attachment of the PMAS occurs via electrostatic binding of PMAS sulfonate groups to Ca2+ sites on the silicates. The surface area and pore volume of the nanocomposites are comparable to those of pure silicate and increase the surface area of the PMAS polymer by several orders of magnitude. The PMAS emeraldine salt in the nanocomposites retains its c
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16

Okamoto, Tamami, and Shigeru Ida. "Monte Carlo Simulation of Dust Particles in a Protoplanetary Disk: Crystalline to Amorphous Silicate Ratio in Comets." Astrophysical Journal 928, no. 2 (2022): 171. http://dx.doi.org/10.3847/1538-4357/ac4bc1.

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Abstract The observationally inferred crystalline abundance in silicates in comets, which should have been formed in the outer region of a protoplanetary disk, is relatively high (∼10%–60%), although crystalline silicates would be formed by the annealing of amorphous precursors in the inner disk region. In order to quantitatively address this puzzle, we performed a Monte Carlo simulation of the advection/diffusion of silicate particles in a turbulent disk in a setting based on the pebble accretion model: pebbles consisting of many small amorphous silicates embedded in an icy mantle are formed
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17

DERRIEN, RICHARD, ETHAN MICHAEL SULLIVAN, STEPHEN LIU, ELODIE MOINE, and FRANCIS BRIAND. "Silicate Island Formation in Gas Metal Arc Welding." Welding Journal 100, no. 01 (2021): 13–26. http://dx.doi.org/10.29391/2021.100.002.

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Abstract (sommario):
Because formation of silicate islands during gas metal arc welding is undesirable due to decreased productivity and decreased quality of welds, it is important to understand the mechanism of the formation of these silicate islands to mitigate their presence in the weld. The effects of welding parameters on the silicate formation rate were studied. Results showed that the applied voltage and oxidizing potential of the shielding gas were the parameters that most strongly influenced the amount of silicates formed on the surface of the weld bead. High-speed video was used to observe the formation
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18

Marler, Bernd, Melanie Müller, and Hermann Gies. "Structure and properties of ITQ-8: a hydrous layer silicate with microporous silicate layers." Dalton Transactions 45, no. 25 (2016): 10155–64. http://dx.doi.org/10.1039/c6dt00713a.

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19

Khachatryan, L. A. "Disperse Layered Silicates in Magnesium Silicate Rocks." Glass Physics and Chemistry 30, no. 1 (2004): 67–72. http://dx.doi.org/10.1023/b:gpac.0000016400.42044.5b.

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20

Hawthorne, Frank C., Yulia A. Uvarova, and Elena Sokolova. "A structure hierarchy for silicate minerals: sheet silicates." Mineralogical Magazine 83, no. 1 (2018): 3–55. http://dx.doi.org/10.1180/mgm.2018.152.

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AbstractThe structure hierarchy hypothesis states that structures may be ordered hierarchically according to the polymerisation of coordination polyhedra of higher bond-valence. A hierarchical structural classification is developed for sheet-silicate minerals based on the connectedness of the two-dimensional polymerisations of (TO4) tetrahedra, where T = Si4+ plus As5+, Al3+, Fe3+, B3+, Be2+, Zn2+ and Mg2+. Two-dimensional nets and oikodoméic operations are used to generate the silicate (sensu lato) structural units of single-layer, double-layer and higher-layer sheet-silicate minerals, and th
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21

Dunn, Pete J. "The lead silicates from Franklin, New Jersey: occurrence and composition." Mineralogical Magazine 49, no. 354 (1985): 721–27. http://dx.doi.org/10.1180/minmag.1985.049.354.12.

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AbstractThe lead silicate minerals from Franklin, New Jersey, occurred in two separate assemblages. One of these is characterized by esperite associated with hardystonite and occasional larsenite. The second assemblage can be considered as two parts: one consists of margarosanite, barysilite, nasonite, and ganomalite; the other contains roeblingite and hancockite, together with a number of highly hydrated phases. Chemical analyses indicate that these species conform to their theoretical compositions. There are no simple lead silicates at Franklin; all are compound silicates of Pb with Mn, Zn,
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22

Payan, François, Albert Issa, Jean-Marc Krafft, et al. "Controlling Magnesium Silicates Coprecipitation Conditions: A Tool to Tune Their Surface Acid–Base Reactivity." Catalysts 13, no. 11 (2023): 1393. http://dx.doi.org/10.3390/catal13111393.

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Magnesium silicates combining acidic and basic surface properties are known to be interesting as heterogeneous catalysts. Nevertheless, their catalytic performances are highly dependent on the synthesis method used. In this study, a series of magnesium silicates was synthesized for the first time using a coprecipitation method with a micromixer. It is first shown that changes in synthesis/precipitation pH led to magnesium silicates with different Mg/Si ratios: the higher the synthesis pH, the higher the Mg/Si ratio. Moreover, prepared silicates with a final Mg/Si ratio greater than 0.7, thus p
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23

Liu, Yongjun, Wenping Luo, Jiali Wu, et al. "Radical addition-polar termination cascade: efficient strategy for photoredox-neutral-catalysed cyclopropanation and Giese-type reactions of alkenyl N-methyliminodiacetyl boronates." Organic Chemistry Frontiers 7, no. 13 (2020): 1588–92. http://dx.doi.org/10.1039/d0qo00349b.

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Silicate meets boronate: efficient cyclopropanation and Giese-type reactions of alkenyl N-methyliminodiacetyl boronates with alkyl silicates have been realized via a photoredox-neutral-catalysed radical-polar crossover process.
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24

Gotlib, Elena, Dilyara Sadykova, Ekaterina Yamaleeva, and Alla Sokolova. "Modification of polyvinylchloride by the silicates on the base of rice husk." E3S Web of Conferences 263 (2021): 01001. http://dx.doi.org/10.1051/e3sconf/202126301001.

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As a modifying additive in PVC-compositions, silicates produced by means of rice husk processing are of practical interest. Rice husk ash obtained by burning at 350°C, along with synthetic and naturally occurring wollastonite, significantly reduce plasticizer’s migration from the PVC-composition due to their porosity. This is due to the fact that the part of hydroxyl components of the plasticizer EDOS has adsorbed on the surface or retained by the silicates pores. Along with that, Miwoll 10-97 ensures a greater decrease in plasticizer’s migration than synthetic calcium silicate on the base of
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25

Plášil, Jakub. "Mineralogy, Crystallography and Structural Complexity of Natural Uranyl Silicates." Minerals 8, no. 12 (2018): 551. http://dx.doi.org/10.3390/min8120551.

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Naturally occurring uranyl silicates are common constituents of the oxidized parts (i.e., supergene zone) of various types of uranium deposits. Their abundance reflects the widespread distribution of Si4+ in the Earth’s crust and, therefore, in groundwaters. Up to date, 16 uranyl silicate minerals are known. Noteworthy is that the natural uranyl silicates are not extremely diverse regarding their crystal structures; it is a result of possible concentrations (activity) of Si4+ in aqueous solutions derived from dissolution of primary Si minerals or the composition of late hydrothermal fluids. Th
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Garbalińska, Halina, Jarosław Strzałkowski, and Agata Stolarska. "Moisture Influence on Compressive Strength of Calcium Silicate Masonry Units–Experimental Assessment and Normative Calculations." Materials 13, no. 17 (2020): 3817. http://dx.doi.org/10.3390/ma13173817.

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This paper primarily assesses the scale of adverse changes to the compressive strength of different types of silicates due to the influence of moisture. The study covers three groups of silicate units of different strength classes—15, 20 and 25—obtained from three different manufacturers. It was demonstrated that in all studied groups, moisture significantly decreased the compressive strength by about 30–40%. In addition, microstructural studies were conducted to analyze the relationship between the specific porosity structure of each group of silicate bricks and their compressive strength. On
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Li, Chao-Feng, Lian-Jun Feng, Xuan-Ce Wang, Simon-A. Wilde, Zhu-Yin Chu, and Jing-Hui Guo. "A low-blank two-column chromatography separation strategy based on a KMnO4 oxidizing reagent for Cr isotope determination in micro-silicate samples by thermal ionization mass spectrometry." Journal of Analytical Atomic Spectrometry 32, no. 10 (2017): 1938–45. http://dx.doi.org/10.1039/c7ja00225d.

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Mor, Nitu, Prabhjot Kaur, Daljeet Kaur, Jitender Sharma, and Sunita Dalal. "Isolation of silicate solubilising microbes (SSM) from soil and water samples as potential components of bio fertilizers." Research Journal of Chemistry and Environment 28, no. 7 (2024): 94–100. http://dx.doi.org/10.25303/287rjce0940100.

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Silicate solubilizing microbes (SSM) are crop beneficial microbes which facilitate silica uptake via plant roots by way of dissolving silicates and making it available in the form of monomeric silicic acid. Excessive use of synthetic fertilizers may negatively affect overall soil health and the environment. To ensure that crops provide competitive yields while preserving the ecological balance of the soil, it is necessary to develop and use bio-fertilizers. For this, a consortium is required which can solubilise complex form of phosphates, silicates etc. to provide important nutrients to crops
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E. Sangok, Faustina, Sabrina M. Yahaya, Izza Taib Nurul, Siti Zaleha Sa'ad, and Nor Fazila Rasaruddin. "Comparison Study of Amino-Functionalized and Mercaptopropyl-Functionalized Mesoporous Silica MCM-41." Advanced Materials Research 550-553 (July 2012): 1603–6. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.1603.

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The ability to decorate silicate surface with different organoalkoxysilanes creates powerful new capabilities for catalyst, adsorbents and chemical separation. Mesopororus silica, MCM-41 was modified by grafting of amino and mercaptopropyl functional group. The structures of these materials were characterized by using Fourier Transform Infrared Spectroscopy (FT-IR), and X-Ray diffraction (XRD). The samples were found to exhibit structural properties similar to those reported earlier. Significant functional groups of the modified mesoporous silicates were found in the spectrum of FT-IR. Standar
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Malik, Priya, Supriya Sehrawat, Aryan Boora, et al. "Optical and structural properties of Nd2O3-SiO2 nanocomposite as synthesized from sol-gel technique." Zastita materijala 64, no. 4 (2023): 512–18. http://dx.doi.org/10.5937/zasmat2304512m.

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Nd2O3-SiO2 nanocomposite was prepared in the current work utilising the sol-gel technique. After being heated in air, the amorphous phase of silicates transformed to crystalline phase via intermediate phase as oxide. Due to its comparatively small operating temperature and ability to form nanostructures with precise size, sol-gel approach is a compelling alternative. X-ray powder diffraction (XRD), Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR), which verified the structural characteristics of neodymium silicate (Nd2O3-SiO2) nanocomposites, were used to c
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Wagh, Arun S., and Victor E. Douse. "Silicate bonded unsintered ceramics of Bayer process waste." Journal of Materials Research 6, no. 5 (1991): 1094–102. http://dx.doi.org/10.1557/jmr.1991.1094.

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Sodium silicates are investigated to enhance the strengths of Bayer process muds and develop structural ceramics without sintering. With an impregnation of sodium silicate from 2% to 10% concentration in red mud, the fracture toughness is enhanced from 0.2 to 0.9 MPa. Compression strengths of 25.1 MPa (3628 psi) have been attained with red mud at 10% silicate concentration. Similar enhancements by a factor of 4 to 5 have been obtained for modulus of rupture and Brinell hardness number. It is shown that these properties do not deteriorate in acidic and neutral environment in water, implying sta
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Ganter, Markus, Wolfram Gronski, Peter Reichert, and Rolf Mülhaupt. "Rubber Nanocomposites: Morphology and Mechanical Properties of BR and SBR Vulcanizates Reinforced by Organophilic Layered Silicates." Rubber Chemistry and Technology 74, no. 2 (2001): 221–35. http://dx.doi.org/10.5254/1.3544946.

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Abstract Rubber compounds based on butadiene rubber (BR) or styrene—butadiene rubber (SBR) containing organophilic layered silicates were prepared. Organophilic silicates were swollen in a rubber/toluene solution. Matrix—filler reactive bonding was performed by adding bis(triethoxysilylpropyl)-tetrasulfan (TESPT) during swelling. Excellent dispersion of organoclay nanofillers in rubber matrices was demonstrated by transmission electron microscopy (TEM) and atomic force microscopy (AFM) exhibiting intercalated and partially exfoliated silicate layers. Matrix—filler interfacial coupling by TESPT
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Sanghani, Manish N., Luc Lajaunie, Kuljeet Kaur Marhas, et al. "Microstructural and Chemical Investigations of Presolar Silicates from Diverse Stellar Environments." Astrophysical Journal 925, no. 2 (2022): 110. http://dx.doi.org/10.3847/1538-4357/ac3332.

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Abstract We report the structural and chemical investigation of nine presolar silicate grains from the CH3/CBb3 chondrite Isheyevo and CR2 chondrite Northwest Africa (NWA) 801. Five of these grains belong to group 1, likely condensed in low- to intermediate-mass asymptotic giant branch (AGB) stars, super-AGB stars, or core-collapse supernovae, while the remaining four grains belong to group 4 and have a supernova origin. The advanced transmission electron microscopy and associated electron spectroscopy analyses show a diverse range of chemical and structural compositions for presolar silicates
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Champness, P. E., and R. W. Devenish. "Elemental mass loss in silicate minerals during x-ray analysis." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (1990): 804–5. http://dx.doi.org/10.1017/s0424820100177155.

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Abstract (sommario):
It has long been recognised that silicates can suffer extensive beam damage in electron-beam instruments. The predominant damage mechanism is radiolysis. For instance, damage in quartz, SiO2, results in loss of structural order without mass loss whereas feldspars (framework silicates containing Ca, Na, K) suffer loss of structural order with accompanying mass loss. In the latter case, the alkali ions, particularly Na, are found to migrate away from the area of the beam. The aim of the present study was to investigate the loss of various elements from the common silicate structures during elect
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Mishagin, Kirill, Elena Gotlib, Ekaterina Yamaleeva, Alla Sokolova, and Aleksey Khatsrinov. "Comparison of the Properties of Calcium Silicates Derived from Different Raw Materials." E3S Web of Conferences 410 (2023): 01001. http://dx.doi.org/10.1051/e3sconf/202341001001.

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The limited deposits of natural wollastonite in our country and the labor intensity of its extraction and processing, make promising the development of methods of its synthesis based on various types of domestic plant and fossil raw materials, especially industrial waste. The use of rice husk ash and calcium oxide in the solid-phase synthesis of calcium silicates ensures the content of β-wollastonite in their composition at the level of naturally-occurring Miwoll10-97. The obtained results indicate greater efficiency of amorphous silicon dioxide for the synthesis in the solid phase of calcium
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36

Simachev, A. S., T. N. Oskolkova, A. A. Umanskii, and A. V. Golovatenko. "Non-metallic inclusions in different zones of crystallization of E90KhAF rail steel." Izvestiya. Ferrous Metallurgy 64, no. 2 (2021): 135–42. http://dx.doi.org/10.17073/0368-0797-2021-2-135-142.

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Metallographic and X-ray studies of continuously cast billets of E90KhAF rail steel have been carried out. We have established the regularities of non-metallic inclusions distribution over the crystallization zones before and after billets deformation. It was revealed that in crustal zone the main non-metallic inclusions are point oxides, aluminum nitrides, iron silicates (FeO·SiO2) and alumosilicates (Al2O3·SiO2). They were identified in the zone of columnar crystals. In central zone of the billet, manganese sulfides (MnS), manganese silicates (MnO·SiO2), alumosilicates (Al2O3·SiO2), iron sil
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37

Mihailova, Irena, and Dimitar Mehandjiev. "Catalytic activity of Co-åkermanite and Co-pyroxene in oxidation reactions." Canadian Journal of Chemistry 89, no. 8 (2011): 939–47. http://dx.doi.org/10.1139/v11-061.

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Two calcium–cobalt silicates were synthesized in which cobalt occupies different structural positions. The crystal phases belong to two main structural silicate types. In the Co-åkermanite structure (Ca2CoSi2O7), cobalt cations take tetrahedral coordination toward oxygen atoms. In the Co-pyroxene structure of CaCoSi2O6, cobalt displays octahedral coordination. Ca2CoSi2O7 was prepared by solid-phase synthesis and CaCoSi2O6 was prepared by sol–gel method. The synthesis of the phases was confirmed by XRD, FTIR, and EPR data. On the basis of the XPS analysis, it can be concluded that Co2+ cations
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38

Almeida Streitwieser, Daniela, Arturo Arteaga, Alvaro Gallo-Cordova, Alexis Hidrobo, and Sebastian Ponce. "Chemical Recycling of Used Motor Oil by Catalytic Cracking with Metal-Doped Aluminum Silicate Catalysts." Sustainability 15, no. 13 (2023): 10522. http://dx.doi.org/10.3390/su151310522.

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The chemical recycling of used motor oil via catalytic cracking to convert it into secondary diesel-like fuels is a sustainable and technically attractive solution for managing environmental concerns associated with traditional disposal. In this context, this study was conducted to screen basic and acidic-aluminum silicate catalysts doped with different metals, including Mg, Zn, Cu, and Ni. The catalysts were thoroughly characterized using various techniques such as N2 adsorption–desorption isotherms, FT-IR spectroscopy, and TG analysis. The liquid and gaseous products were identified using GC
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39

JIA, FEIFEI, and SHAOXIAN SONG. "EXFOLIATION AND CHARACTERIZATION OF LAYERED SILICATE MINERALS: A REVIEW." Surface Review and Letters 21, no. 02 (2014): 1430001. http://dx.doi.org/10.1142/s0218625x14300019.

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Exfoliated silicate minerals have attracted great attentions because of the dramatic improvement in properties. This paper highlights the preparation of exfoliated silicate minerals, including physical, chemical, mixed physical and chemical methods. The mechanisms by which silicates are exfoliated and the important influential factors are also summarized. Finally, the instrumental techniques to characterize the exfoliated structure and exfoliation degree are presented.
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40

Morard, Guillaume, Jean-Alexis Hernandez, Marco Guarguaglini, et al. "In situ X-ray diffraction of silicate liquids and glasses under dynamic and static compression to megabar pressures." Proceedings of the National Academy of Sciences 117, no. 22 (2020): 11981–86. http://dx.doi.org/10.1073/pnas.1920470117.

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Properties of liquid silicates under high-pressure and high-temperature conditions are critical for modeling the dynamics and solidification mechanisms of the magma ocean in the early Earth, as well as for constraining entrainment of melts in the mantle and in the present-day core–mantle boundary. Here we present in situ structural measurements by X-ray diffraction of selected amorphous silicates compressed statically in diamond anvil cells (up to 157 GPa at room temperature) or dynamically by laser-generated shock compression (up to 130 GPa and 6,000 K along the MgSiO3glass Hugoniot). The X-r
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41

Krüger, Hannes, Peter Tropper, Udo Haefeker, et al. "Innsbruckite, Mn33(Si2O5)14(OH)38 – a new mineral from the Tyrol, Austria." Mineralogical Magazine 78, no. 7 (2014): 1613–27. http://dx.doi.org/10.1180/minmag.2014.078.7.06.

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AbstractA description of the new mineral innsbruckite, Mn33(Si2O5)14(OH)38, a hydrous manganese phyllosilicate found in Tyrol, Austria is given. The crystal structure was determined by singlecrystal synchrotron radiation diffraction experiments at the X06DA beamline at the Swiss Light Source (Paul Scherrer Institute, Villigen, Switzerland). The space group is Cm and lattice parameters are a = 17.2760(19), b = 35.957(5), c = 7.2560(8) Å , β = 91.359(7)º, V = 4506.1(10) Å3, Z = 2. Innsbruckite belongs to the group of modulated 1:1 layer silicates and is chemically and structurally quite closely
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42

Tang, Tao, Huo Gen Huang, and De Li Luo. "Solid-State Reaction Synthesis and Mechanism of Lithium Silicates." Materials Science Forum 654-656 (June 2010): 2006–9. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.2006.

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Lithium-based ceramics have been recognized as promising tritium breeding-materials for D-T fusion reactor blankets. Lithium silicates, Li4SiO4 and Li2SiO3, are recommended by many ITER research teams as the first selection for the solid tritium breeder. The solid-state reaction method is the most important way to synthesize lithium silicates. In present study, the processes of solid-sate reaction between amorphous silica and Li2CO3 powders was investigaed by TGA/DSC; the lithium silicate powders were synthesized at 700~900°C with different Li:Si molar ratio using solid-state reaction method.
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43

Esteban Benito, Heriberto, Ricardo García Alamilla, Juan Manuel Hernández Enríquez, Francisco Paraguay Delgado, Daniel Lardizabal Gutiérrez, and Pedro García. "Porous Silicates Modified with Zirconium Oxide and Sulfate Ions for Alcohol Dehydration Reactions." Advances in Materials Science and Engineering 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/325463.

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Abstract (sommario):
Porous silicates were synthesized by a nonhydrothermal method, using sodium silicate as a source of silica and cetyltrimethylammonium bromide as a template agent. Catalysts were characterized using thermogravimetric analysis, N2physisorption, X-ray diffraction, FTIR spectroscopy, pyridine adsorption, potentiometric titration withn-butylamine, scanning electronic microscopy, and transmission electronic microscopy. The surface area of the materials synthesized was greater than 800 m2/g. The introduction of zirconium atoms within the porous silicates increased their acid strength from −42 to 115
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44

Vereshchagin, V. I., and T. S. Petrovskaya. "TRADITIONS AND PERSPECTIVES OF THE TECHNOLOGY OF SILICATES AND NANOMATERIALS DEPARTMENT." Steklo i Keramika, no. 13 (January 2023): 47–50. http://dx.doi.org/10.14489/glc.2023.01.pp.047-050.

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The article provides a brief historical outline of the activities of the Technology of Silicates and Nanomaterials Department of the National Research Tomsk Polytechnic University which is the first technical university in the Asian part of Russia. Initially, the Laboratory of Chemical Technology of Mineral Substances, since 1929 the Silicate Technology Department, since 2007 the Technology of Silicates and Nanomaterials Department, nowdays it is one of the leading scientific and educational centers of the country for the study of silicate raw materials, the development of advanced technologie
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45

Mennella, Vito, and Tushar Suhasaria. "H2 formation on Mg-rich amorphous silicates." Proceedings of the International Astronomical Union 15, S350 (2019): 109–13. http://dx.doi.org/10.1017/s1743921319008834.

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AbstractWe present the results of an experimental study on the interaction of D atoms with Mg-rich amorphous silicates. The effects of D irradiation have been analyzed by infrared spectroscopy. The results indicate that HD forms by abstraction of hydrogen atoms chemisorbed in the hydroxyl groups of silicate grains. The formation process occurs for grain and atom temperatures relevant to photodissociation regions.
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46

Shchipalkina, Nadezhda V., Igor V. Pekov, Natalia N. Koshlyakova, et al. "Unusual silicate mineralization in fumarolic sublimates of the Tolbachik volcano, Kamchatka, Russia – Part 2: Tectosilicates." European Journal of Mineralogy 32, no. 1 (2020): 121–36. http://dx.doi.org/10.5194/ejm-32-121-2020.

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Abstract. This second of two companion articles devoted to silicate mineralization in fumaroles of the Tolbachik volcano (Kamchatka, Russia) reports data on chemistry, crystal chemistry and occurrence of tectosilicates: sanidine, anorthoclase, ferrisanidine, albite, anorthite, barium feldspar, leucite, nepheline, kalsilite, sodalite and hauyne. Chemical and genetic features of fumarolic silicates are also summarized and discussed. These minerals are typically enriched with “ore” elements (As, Cu, Zn, Sn, Mo, W). Significant admixture of As5+ (up to 36 wt % As2O5 in sanidine) substituting Si is
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47

Ghio, A. J., T. P. Kennedy, A. R. Whorton, A. L. Crumbliss, G. E. Hatch, and J. R. Hoidal. "Role of surface complexed iron in oxidant generation and lung inflammation induced by silicates." American Journal of Physiology-Lung Cellular and Molecular Physiology 263, no. 5 (1992): L511—L518. http://dx.doi.org/10.1152/ajplung.1992.263.5.l511.

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Abstract (sommario):
Inhalation of silicates induces a variety of lung diseases in humans. The molecular mechanism(s) by which these dusts cause disease is not known. Because several naturally occurring mineral oxides have large amounts of transition metal ions on their surfaces, we tested the hypothesis that surface complexation of iron may be an important determinant of their ability to induce disease. Silica, crocidolite, kaolinite, and talc complexed considerable concentrations of Fe3+ onto their surfaces from both in vitro and in vivo sources. The potential biological importance of iron complexation was asses
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48

Zulputra, Zulputra, and Nelvia Nelvia. "KETERSEDIAAN P, SERAPAN P DAN SI OLEH TANAMAN PADI GOGO (Oryza sativa. L) PADA LAHAN ULTISOL YANG DIAPLIKASIKAN SILIKAT DAN PUPUK FOSFAT." JURNAL AGROTEKNOLOGI 8, no. 2 (2018): 9. http://dx.doi.org/10.24014/ja.v8i2.3351.

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The research was conducted from August 2014 to Januari 2015 in the Ultisol Land, Pematang Berangan Village, Rokan Hulu Regency, Riau Province. The study aims to determine the availability of P, P and Si uptake by upland rice plants granting silicate and phosphate fertilizer on Ultisol land. The form of this research is experimental factorial completely randomized design consist of two factors. The first factor is silicate consists of four levels (0, 50, 75, and 100 kg SiO2/ha), while the second factor is phosphate fertilizer consists of four levels (0, 36, 54, and 72 kg P2O5/ha), each combinat
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49

Ramamurthy, Sundar, Brian C. Hebert, and C. Barry Carter. "Olivine-MgO interfaces produced by crystallization of glass fulms on single-crystal MgO substrates." Proceedings, annual meeting, Electron Microscopy Society of America 53 (August 13, 1995): 342–43. http://dx.doi.org/10.1017/s0424820100138087.

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Glassy silicates are present at grain boundaries in almost all liquid-phase sintered ceramic oxides. In many cases, the amorphous-crystalline interfaces in the sintered microstructure can be modified by inducing crystallization of the glassy phase. The intergranular phases in polycrystalline MgO are typically silicates with cations of calcium, magnesium and iron in the silicate network. A systematic approach to study the crystallization behavior of glass-MgO interfaces has been attempted in the present study. Following the work by Mallamaci in which crystallization of a silicate glass in conta
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50

Manakova, N. K., and O. V. Suvorova. "Obtaining of heat-insulating materials based on silica-containing waste with the addition of dolomite." Вестник гражданских инженеров 17, no. 6 (2020): 149–55. http://dx.doi.org/10.23968/1999-5571-2020-17-6-149-155.

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The paper presents the results of the study of feasibility of obtaining high-quality foamed thermal insulation materials based on a silicate matrix with addition of dolomite. It has been found out that the preliminary activation of a suspension based on a silica-containing component at a temperature of 90°C for 5-7 minutes allows accelerating the coagulation of silica fume and the synthesis of sodium silicates. Optimal foaming conditions for the charge frothing are 650-700°C for 25 minutes. There have been obtained foam silicates with a relatively uniform finely porous structure and stable phy
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