Relevant bibliographies by topics / SiO2

Academic literature on the topic 'SiO2'

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Published: 4 June 2021
Last updated: 25 May 2024

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Journal articles on the topic "SiO2"

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Liu, Peng, Qiang Ma, Yongwei Chen, Shujin Chen, Jie Zhu, Peng He, Xiaojiang Chen, Xiao Jin, and Bin Zheng. "Study on the Effect of “3D-rGO” Buffer Layer on the Microstructure and Properties of SiO2f/SiO2 and TC4 Brazed Joint." Materials 17, no. 6 (March 19, 2024): 1394. http://dx.doi.org/10.3390/ma17061394.

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Brazing a SiO2f/SiO2 composite with metals is often faced with two problems: poor wettability with the brazing alloy and high residual stress in the joint. To overcome these problems, we report a combined method of selective etching and depositing reduced graphene oxide (rGO) on the surface of a SiO2f/SiO2 composite (3D-rGO-SiO2f/SiO2) to assist brazing with TC4. After the combined treatment, a “3D-rGO” buffer layer formed on the surface layer of the SiO2f/SiO2, and the contact angle was reduced from 130° to 38°, which meant the wettability of active brazing alloy on the surface of SiO2f/SiO2 was obviously improved. In addition, the “3D-rGO” buffer layer contributed to fully integrating the brazing alloy and SiO2f/SiO2; then, the infiltration of the brazing alloy into the surface layer of the SiO2f/SiO2 was enhanced and formed the reduced graphene oxide with a pinning structure in the three dimensional (“3D-pinning-rGO”) structure. Moreover, the joining area of the brazing alloy and SiO2f/SiO2 was expanded and the mismatch degree between the SiO2f/SiO2 and TC4 was reduced, which was achieved by the “3D-pinning-rGO” structure. Furthermore, the concentration of the residual stress in the SiO2f/SiO2-TC4 joints transferred from the SiO2f/SiO2 to the braided quartz fibers, and the residual stress reduced from 142 MPa to 85 MPa. Furthermore, the 3D-pinning-rGO layer facilitated the transfer of heat between the substrates during the brazing process. Finally, the shear strength of the SiO2f/SiO2-TC4 joints increased from 12.5 MPa to 43.7 MPa by the selective etching and depositing rGO method.
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Xue, Yu, Letian Qi, Zhaoyun Lin, Guihua Yang, Ming He, and Jiachuan Chen. "High-Strength Regenerated Cellulose Fiber Reinforced with Cellulose Nanofibril and Nanosilica." Nanomaterials 11, no. 10 (October 11, 2021): 2664. http://dx.doi.org/10.3390/nano11102664.

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In this study, a novel type of high-strength regenerated cellulose composite fiber reinforced with cellulose nanofibrils (CNFs) and nanosilica (nano-SiO2) was prepared. Adding 1% CNF and 1% nano-SiO2 to pulp/AMIMCl improved the tensile strength of the composite cellulose by 47.46%. The surface of the regenerated fiber exhibited a scaly structure with pores, which could be reduced by adding CNF and nano-SiO2, resulting in the enhancement of physical strength of regenerated fibers. The cellulose/AMIMCl mixture with or without the addition of nanomaterials performed as shear thinning fluids, also known as “pseudoplastic” fluids. Increasing the temperature lowered the viscosity. The yield stress and viscosity sequences were as follows: RCF-CNF2 > RCF-CNF2-SiO22 > RCF-SiO22 > RCF > RCF-CNF1-SiO21. Under the same oscillation frequency, G’ and G” decreased with the increase of temperature, which indicated a reduction in viscoelasticity. A preferred cellulose/AMIMCl mixture was obtained with the addition of 1% CNF and 1% nano-SiO2, by which the viscosity and shear stress of the adhesive were significantly reduced at 80 °C.
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Kosa, Ladislav, Ivan Nerád, Jozef Strečko, Ivo Proks, and Katarína Adamkovičová. "Differential Enthalpies of Solution of Components in Binary Systems 2 CaO . Al2O3 . SiO2-CaO . Al2O3 . 2 SiO2, CaO . SiO2-CaO . Al2O3 . 2 SiO2 and CaO . SiO2-2 CaO . Al2O3 . SiO2." Collection of Czechoslovak Chemical Communications 58, no. 9 (1993): 1989–96. http://dx.doi.org/10.1135/cccc19931989.

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Differential enthalpies of solution of components in binary systems 2 CaO . Al2O3 . SiO2-CaO . Al2O3 . 2 SiO2, CaO . SiO2-CaO . Al2O3 . 2 SiO2 and CaO . SiO2-2 CaO . Al2O3 . SiO2 as the function of composition and temperature were determined on the base of isothermal composition dependences of enthalpies of mixing and temperature dependences of heats of fusion of their pure components. From the values of the first differential heat of solution of CaO . Al2O3 . 2 SiO2 and 2 CaO . Al2O3 . SiO2 in CaO . SiO2 over temperature range considered we can conclude that the reactions were closed chains of SiO4 tetrahedra in CaO . SiO2 melt break, are exothermic. On the other hand positive values of this quantity for CaO . SiO2 in CaO . Al2O3 . 2 SiO2 and 2 CaO . Al2O3 . SiO2 led us to the conclusion that the progressive breaking originally closed chains in CaO . SiO2 melt has endothermic character.
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Xu, Chang Ming, Shi Wei Wang, Xiao Xian Huang, and Jing Kun Guo. "Influence of Pressure on the Crystallization in SiO2f/SiO2 Composites." Key Engineering Materials 336-338 (April 2007): 1236–38. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.1236.

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The influence of pressure on the crystallization behavior in SiO2f/SiO2 composites hotpressed at 1350°C was studied. The crystalline phase composition analysis on SiO2f/SiO2 composites revealed that the formation of cristobalite was promoted when the hot-pressing pressure ≤ 12 MPa, however suppressed with higher pressure applied. It can be ascribed to the nucleation mechanism change from surface nucleation to bulk nucleation. Analysis on relative density as well as fracture microstructure of SiO2f/SiO2 composites confirmed the conclusion.
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Mao, Huahai, Olga Fabrichnaya, Malin Selleby, and Bo Sundman. "Thermodynamic assessment of the MgO–Al2O3–SiO2 system." Journal of Materials Research 20, no. 4 (April 1, 2005): 975–86. http://dx.doi.org/10.1557/jmr.2005.0123.

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Thermodynamic properties of the phases in the MgO–Al2O3–SiO2 system were assessed, resulting in a set of self-consistent thermodynamic data. The two ternary compounds, cordierite and sapphirine, were optimized from subsolidus reactions. The liquid phase was described by the ionic two-sublattice model with a new species AlO2−1, yielding the formula (Al+3,Mg+2)P(AlO2−1,O−2,SiO4−4,SiO20)Q. Projection of the liquidus surface was calculated. Various isothermal and isoplethal sections were compared with the experimental data.
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Ci, Ji Liang, Feng Dan Cui, Li Li Zhang, Jian Zhang, Yi Lv, Ying Min Zhao, and Hao Zhang. "Study on the Highe-Temperature Mechanical of Al<sub>2</sub>O<sub>3f</sub>/SiO<sub>2</sub> and SiO<sub>2f</sub>/SiO<sub>2</sub> Ceramic Matrix Composites." Solid State Phenomena 330 (April 12, 2022): 91–98. http://dx.doi.org/10.4028/p-6kd5u0.

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Al2O3f/SiO2 and SiO2f/SiO2 ceramic matrix composites were manufactured by silica sol-infiltration-sintering method. The mechanical properties of composites under room temperature to 1200 °C were tested on-line with universal testing machine. It is found that Al2O3f/SiO2 composites present a higher strength than SiO2f/SiO2 at room temperature and 1000 °C. The strength of two composites dramatic decrease with temperature increased to 1200 °C. Also, SEM and XRD methods were adopted to investigate the micro-structure of cross-fraction and crystal phase of composites, indicating a strong interaction between fibers and matrix under high temperature. Finally, the dielectric properties of two composites under room temperature to 1200 °C were discussed.
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Han, Shu Ang, Kai Hui Jiang, and Jun Wu Tang. "Studies on Preparation and Property of 2.5D SiO2f/ SiO2 Composites." Advanced Materials Research 79-82 (August 2009): 1767–70. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1767.

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In this paper, 2.5D SiO2f/SiO2 composites were fabricated via sol-gel process employing 2.5D braided silica fiber fabrics as reinforcements and high pure silicasol as slurry. The process parameters are optimized and the optimal parameters are as follows: the silicasol of 30.8 wt. % as slurry, microwave drying, and sintering at 900 °C. Utilizing the optimal process parameters, the density and the flexural strength of the composites can reach 1.65 g•cm-3 and 80.68 MPa respectively. Dielectric properties of the 2.5D SiO2f/SiO2 composites were also measured, and the real part of the permittivity is 3.40 at 5 GHz. The excellent mechanical and dielectric properties of the 2.5D SiO2f/SiO2 composites can well meet the requirements of radome materials.
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Urakawa, Satoru, Toru Inoue, Takanori Hattori, Asami Sano-Furukawa, Shinji Kohara, Daisuke Wakabayashi, Tomoko Sato, Nobumasa Funamori, and Ken-ichi Funakoshi. "X-ray and Neutron Study on the Structure of Hydrous SiO2 Glass up to 10 GPa." Minerals 10, no. 1 (January 20, 2020): 84. http://dx.doi.org/10.3390/min10010084.

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The structure of hydrous amorphous SiO2 is fundamental in order to investigate the effects of water on the physicochemical properties of oxide glasses and magma. The hydrous SiO2 glass with 13 wt.% D2O was synthesized under high-pressure and high-temperature conditions and its structure was investigated by small angle X-ray scattering, X-ray diffraction, and neutron diffraction experiments at pressures of up to 10 GPa and room temperature. This hydrous glass is separated into two phases: a major phase rich in SiO2 and a minor phase rich in D2O molecules distributed as small domains with dimensions of less than 100 Å. Medium-range order of the hydrous glass shrinks compared to the anhydrous SiO2 glass by disruption of SiO4 linkage due to the formation of Si–OD deuterioxyl, while the response of its structure to pressure is almost the same as that of the anhydrous SiO2 glass. Most of D2O molecules are in the small domains and hardly penetrate into the void space in the ring consisting of SiO4 tetrahedra.
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Radev, Lachezar, Liliana Pavlova, Bisserka Samuneva, Elena Kashchieva, Irena Mihailova, Maria Zaharescu, Barbara Malic, and Luminita Predoana. "Sol-gel synthesis and structure of La2O3-CoO-SiO2 powders." Processing and Application of Ceramics 2, no. 2 (2008): 103–8. http://dx.doi.org/10.2298/pac0802103r.

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LaCoO3 powders are studied because they exhibit interesting electrical, magnetic and catalytic properties. In this paper, new synthesized La2O3-CoO-SiO2 powders with different quantity of silica were prepared via solgel method in aqua media, starting from metal nitrates with different chelating agents. The relation between the reaction in solution, crystallization pathway and morphology were discussed. In LaCoO3-SiO2 powders, depending on the content of SiO2 and the treatment temperature (700-1100?C), different crystalline phases (LaCoO3, Co2 SiO4 and La9.31 (SiO4 )6 O2) were observed with the crystallite sizes ranging from 50 to 100 nm. It was proved that chemical composition and nature of used additives has influence on the phase formation and structure of obtained nanomaterials.
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Jiang, Yun, and Zhen Kai Wan. "Studies on Tensile and Shear Properties of 3D Six-Directional SiO2f/SiO2 Composites." Advanced Materials Research 1048 (October 2014): 436–39. http://dx.doi.org/10.4028/www.scientific.net/amr.1048.436.

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SiO2f/SiO2 composites reinforced with 3D six-directional preform were fabricated by silicasol-infiltration-sintering method. To characterize the mechanical properties of the composites, mechanical testing was carried out under various loading conditions, including tensile and shear loading. All of the testing curves exhibited highly nonlinear behavior. The results indicated that the 3D six-directional braided SiO2f/SiO2 composites exhibited superior tensile properties and good shear resistant. Therefore, the 3D six-directional braided composites developed can well meet the demands of the thermal structure component.
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Dissertations / Theses on the topic "SiO2"

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Jakobsson, Lars Klemet. "Distribution of boron between silicon and CaO-SiO2, MgO-SiO2,CaO-MgO-SiO2 and CaO-Al2O3-SiO2 slags at 1600°C." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for materialteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-24010.

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New energy sources are needed for a sustainable future. Solar cells have a huge potential as a sustainable energy source but further development of this technology is needed for solar cells to become cost-competitive with other energy sources. Silicon produced by metallurgical refining methods has the potential of reducing the cost of crystalline silicon solar cells significantly but boron has proven to be hard to remove from silicon by these methods. Slag refining is however a promising refining method for removal of boron from silicon. The aim of this thesis was to determine accurate data for the distribution of boron between silicon and selected slags. All published values of the distribution coefficient of boron have been critically reviewed in this work. The thermodynamic properties and distribution of other major components of the system have also been reviewed. Several experiments with silicon and CaO-SiO2, MgO-SiO2, CaO-MgO-SiO2 and CaO-Al2O3-SiO2 slags have been conducted at 1600 °C under argon atmosphere. A series of experiments with ferrosilicon and CaO-SiO2 slags have also been carried out. Accurate data for the distribution of boron between silicon and CaO-SiO2, MgO-SiO2, CaO-MgO-SiO2 and CaO-Al2O3-SiO2 slags at 1600 °C has been determined. The distribution of other major slag components between slag and silicon has also been found in these slag systems. The distribution of calcium and boron between ferrosilicon and CaO-SiO2 slags at 1600 °C has been determined. Activities of slag forming components have been determined in the CaO-SiO2, MgO-SiO2 and CaO-MgO-SiO2 systems. The activity coefficient of BO1.5 at infinite dilution in these slags has also been determined. Activity coefficients of calcium, magnesium and aluminium at infinite dilution in silicon and the activity coefficient of calcium and boron at infinite dilution in ferrosilicon have been determined. An alternative equation for mass transfer has been derived and the mass transfer coefficient of boron in a 37.9%CaO-62.1%SiO2 slag has been estimated to be ks = 5.2 · 10-7m/s. The refining efficiency of CaO-MgO-SiO2 slags has been found to be approximately the same independently of slag composition with a distribution coefficient of boron between 2 and 2.5. This also includes the binary CaO-SiO2 and MgO-SiO2 systems. The activity coefficient of BO1.5 at infinite dilution in CaO-MgO-SiO2 slags, including the binary CaO-SiO2 and MgO-SiO2 systems, has been found to follow the activity coefficient of SiO2 where  . A linear decrease of the distribution coefficient was found with increasing Al2O3 content in a ternary CaO-Al2O3-SiO2 slag. This has been found to be caused by an increasing activity coefficient of BO1.5 at infinite dilution in slag relative to the activity coefficient of SiO2 where. The distribution coefficient of boron between ferrosilicon and CaO-SiO2 slags was found to be unchanged with iron content in silicon
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Cardoso, William da Silva. "Oxido misto de SiO2/SnO2,SiO2/SnO2/Fosfato : propriedades e aplicações." [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249698.

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Orientador: Yoshitaka Gushikem
Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Quimica
Made available in DSpace on 2018-08-04T23:27:35Z (GMT). No. of bitstreams: 1 Cardoso_WilliamdaSilva_D.pdf: 740346 bytes, checksum: bbae1435b7392cf211b02cc55af7333d (MD5) Previous issue date: 2005
Doutorado
Quimica Inorganica
Doutor em Ciências
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Atik, Mohamed. "La cavitation et ses effets dans la synthèse des matériaux composites (SiO2-SiO2) et (SiO2-SiO2)(B2O3) : étude détaillée du processus du frittage et effets des inclusions rigides." Montpellier 2, 1990. http://www.theses.fr/1990MON20205.

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Synthese des gels composites (sio#2-sio#2) et (sio#2-sio#2) (b#2o#3) a partir des dispersions de teos-aerosil et teos-teb-aerosil par les techniques de sonocatalyse. Mise en forme des materiaux resultants et leur conversion en verre par frittage conventionnel. Le frittage des materiaux composites a ete etudie en detail; notamment l'influence des inclusions sur la cinetique de densification. La croissance des filaments de (nh#4cl) (sio#2) a ete observee au cours du sechage de ces gels composites
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Andrianainarivelo, Mahandrimanana. "Homogénéité d'oxydes mixtes SiO2-ZrO2, SiO2-TiO2, TiO2-ZrO2, Al2O3-TiO2 et Al2O3-SiO2 préparés par sol-gel non hydrolytiques." Montpellier 2, 1996. http://www.theses.fr/1996MON20077.

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Dans ce travail, nous avons prepare des oxydes mixtes: sio#2-zro#2, sio#2-tio#2, tio#2-zro#2, al#2o#3-tio#2 et al#2o#3-sio#2 par un procede sol-gel non hydrolytique base sur la condensation des chlorures metalliques et les alcoxydes metalliques ou entre des chlorures metalliques et des donneurs d'oxygene tels que les ethers. Les rendements en oxydes obtenus apres elimination des groupements organiques residuels sont eleves. Edx et icp nous ont permis de montrer que la composition des oxydes finaux dependait directement de la stoechiometrie des precurseurs. L'homogeneite des gels a ete determinee par leur comportement a la cristallisation et par rmn du #2#9si et ir. Les gels bicomposants obtenus par la voie sol-gel non hydrolytique sont homogenes sauf lorsque le taux de titane est superieur a 8. 5% dans le systeme sio#2/tio#2
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Inagaki, Camila Suemi. "Síntese, caracterização e propriedades fotocatalíticas dos nanocompósitos SiO2/TiO2 e SiO2/TiO2/ZnO." Universidade Estadual de Londrina. Centro de Ciências Exatas. Programa de Pós-Graduação em Química, 2014. http://www.bibliotecadigital.uel.br/document/?code=vtls000193784.

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Este trabalho relata a preparação dos materiais nanoestruturados SiO2/TiO2 (ST) e SiO2/TiO2/ZnO (STZ) pelo método sol-gel em catálise ácida. Os materiais ST foram preparados em diferentes proporções de Si:Ti e Si:Ti:Zn. A caracterização dos materiais ST e STZ foi realizada por análises químicas e por diversas técnicas como: microscopia eletrônica de varredura, espectroscopia de energia dispersiva, medida da área superficial específica, refletância difusa, microscopia eletrônica de transmissão em alta resolução, difração de raios-X e espectroscopia Raman. Pela caracterização foi possível constatar que os materiais são nanocristalinos com domínios entre 4 e 5 nm e com característica estrutural microporosa. No material ST foi identificado apenas domínios cristalinos da fase anatase (TiO2), enquanto no material STZ as fases nanocristalinas identificadas foram: a anatase e o rutilo (TiO2), a wurtzita (ZnO), o espinélio invertido titanato de zinco (Zn2TiO4) e na superfície do material STZ com maiores quantidades de Ti e Zn a fase α-quartzo. As propriedades fotocatalíticas destes materiais nanocristalinos foram estudadas utilizando-se corantes têxteis catiônicos e a luz solar natural sem a utilização de oxidantes fortes adicionais. O material STZ na maior proporção Ti:Zn apresentou a maior eficiência fotocatalítica, sendo capaz de degradar totalmente o corante azul de metileno após 30 minutos, o corante amarelo ouro GL após 150 minutos e o corante azul royal GRL após 180 minutos de irradiação solar natural. A mineralização total das moléculas orgânicas em solução aquosa foi confirmada pela análise de carbono orgânico total que mostrou resultado negativo no extrato após a irradiação solar. A cinética de fotodegradação dos corantes têxteis segue o modelo matemático de primeira ordem aparente.
This work reports the preparation of the SiO2/ZnO (ST) and SiO2/TiO2/ZnO (STZ) nanocomposites by the sol-gel in acid catalysis method. The ST materials were prepared in different Si:Ti and SI:Ti:Zn proportions. The characterization of the ST and STZ materials was made with chemical analysis and with several techniques such as: scanning electron microscopy, energy-dispersive spectroscopy, measurement of the specific surface area, difuse reflectance, high-resolution transmission electron microscopy, X-ray diffraction and Raman spectroscopy. It was possible with the characterization to verify that the materials are nanocrystalline with domains between 4 and 5 nm and with a microporous structural characteristic. In the ST material only crystalline domains of the anatase phase (TiO2) were identified, while in the STZ material the nanocrystalline phases identified were: anatase and rutile (TiO2), wurtzite (ZnO), the inverted zinc titanate spinel (Zn2TiO4) and in the surface of the STZ material with greater quantities of Ti and Zn in α-quartz phase. The photocatalytical properties of these nanocrystalline materials were studied using cationic textile dyes and natural sunlight without the use of additional strong oxidizers. The STZ material in the greater Ti:Zn proportion presented the greatest photocatalytical efficiency, being capable of completely degrade the methylene blue dye after 30 minutes, the yellow gold GL dye after 150 minutes and the royal blue GRL after 180 minutes of natural sunlight irradiation. The total mineralization of the organic molecules in aqueous solution was confirmed by the total organic carbon analysis which showed negative results in the extract after solar irradiation. The photodegradation kinetics of the textile dyes follows the mathematical model of apparent first order.
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Salvado, Isabel. "Preparação pelo processo "sol-gel" e caracterização de materiais dos sistemas SiO2-ZrO2, SiO2-TiO2 e SiO2-Al2O3. Aplicação como revestimentos protectores." Doctoral thesis, Universidade de Aveiro, 1990. http://hdl.handle.net/10773/15523.

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Stankevič, Marta. "Krūvio pernešimo mechanizmų Al-SiO2-n/Si ir Al-SiO2-n/GaAS dariniuose tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2005. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2005~D_20050616_153138-50492.

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In this work was investigate the charge transport mechanism in Al–SiO2–n/Si and Al–SiO2-n/GaAs formations and compared data of experiment with theory. A lot of works are write about this problem, but the electric current transmit mechanism in this formations is still not clear known. In other works is discrepancy of data witch shows relation between electrics juice and electric field juice or temperature. In this work was carry out an experiment witch could explain what is mechanism in real. The new methods that were used in experiments let us definite get electric field juice in potential barrier and t interaction constant of electron and phonon and density of electrons. The data of real experiment was compared with theoretical data gathered with ‘Mathematica’.
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Rebohle, L. "Lumineszenzeigenschaften ionenimplantierter nanokristalliner SiO2-Schichten." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-30099.

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Rebohle, L. "Lumineszenzeigenschaften ionenimplantierter nanokristalliner SiO2-Schichten." Forschungszentrum Rossendorf, 1999. https://hzdr.qucosa.de/id/qucosa%3A21836.

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Cho, Eun Chel Electrical Engineering UNSW. "Optical transitions in SiO2/crystalline Si/SiO2 quantum wells and nanocrystalline silicon (nc-Si)/SiO2 superlattice fabrication (Restricted for 24 months until Feb. 2006)." Awarded by:University of New South Wales. Electrical Engineering, 2003. http://handle.unsw.edu.au/1959.4/22492.

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Innovation in photovoltaic technology may offer cost competitive options to other energy sources and become a viable solution for the energy and environmental challenges of the 21st century. One proposed innovative technology is based on all-silicon tandem cells, which are constructed using superlattices consisting of environmental friendly Si and its compounds. The well and barrier materials in superlattices are restricted to silicon and silicon oxide during the present study. Single crystalline Si/SiO2 quantum wells (QWs) have been fabricated by thermal oxidation of silicon-on-insulator (SOI) wafers. It is found that oxide properties in QWs are important for SOI wafers prepared by the SIMOX (Separation by Implantation of Oxygen) technique. However, QWs fabricated from SOI wafers prepared by the ELTRAN (Epitaxial Layer TRANsfer) approach show the effect of quantum confinement without evidence of strong oxide interfacial transitions. In these wafers, evidence for an apparently ordered silicon oxide was found with 1.92?atomic fringe spacing along the (110) direction of the Si structure and with the thickness about 17?along the (100) direction of the Si structure. Luminescence wavelength ranges are from 700nm to 918nm depending on the Si thickness. The luminescence measurements on other positions of the sample show peak and shoulder spectra, which are explained by monolayer fluctuations in QW thicknesses, previously observed in III-V QWs and II-VI QWs. Si/SiO2 superlattices are fabricated by RF magnetron sputtering. Si density is the key issue in crystallizing the superlattice. High-density Si layers crystallize either under high temperature furnace annealing or rapid thermal process annealing. However, low density Si would not crystallize even at high temperature. Crystallized nanocrystals in the Si layers are observed by high resolution transmission electron microscopy (HRTEM) when the Si layer is thicker than 3nm. When Si layers are thinner than 3nm, the Si layers are discontinuous and finally deteriorate into small nanocrystals. The suitability of such superlattices for surface passivation and antireflection coatings is reviewed. Initial attempts to fabricate heterojunctions between Si wafers and Si/SiO2 superlattices resulted in open circuit voltage of 252mV. However, it is expected that better results would be obtained if Si/SiO2 superlattices were fully crystallized.
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Books on the topic "SiO2"

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Khoroshavin, L. B. Forsterit 2MgO-SiO2: Forsterite 2MgO-SiO2 / L.B. Khoroshavin. Moskva: "Teplotekhnik,", 2004.

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2

Helms, C. Robert, and Bruce E. Deal, eds. The Physics and Chemistry of SiO2 and the Si-SiO2 Interface. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4899-0774-5.

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SiO2 in Si microdevices. Tokyo: Kodansha, 2002.

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Helms, C. Robert, and Bruce E. Deal, eds. The Physics and Chemistry of SiO2 and the Si-SiO2 Interface 2. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4899-1588-7.

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Devine, Roderick A. B., ed. The Physics and Technology of Amorphous SiO2. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-1031-0.

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Gascoin, F. Co hydrogenation over Ru-Co/SiO2 catalysts. Manchester: UMIST, 1994.

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Moman, A. A. CO hydrogenation over Ru-Cs/SiO2 catalysts. Manchester: UMIST, 1994.

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Tungkamani, S. CO hydrogenation over Ru-Rb/SiO2 catalysts. Manchester: UMIST, 1996.

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Fatolas, K. CO Hydrogenation over Ru - Mn/SiO2 catalysts. Manchester: UMIST, 1996.

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Guinot, C. Martinez. Co Hyrogenation over ru-mn/sio2 catalysts. Manchester: UMIST, 1995.

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Book chapters on the topic "SiO2"

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, N. Melnichenko-Koblyuk, et al. "SiO2." In Structure Types. Part 5: Space Groups (173) P63 - (166) R-3m, 843. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-46933-9_705.

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Pierre, Alain C., and Arnaud Rigacci. "SiO2 Aerogels." In Aerogels Handbook, 21–45. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-7589-8_2.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, V. Kuprysyuk, and I. Savysyuk. "SiO2 α-quartz." In Structure Types. Part 8: Space Groups (156) P3m1 – (148) R-3, 419. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-70892-6_220.

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Villars, P., K. Cenzual, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, V. Kuprysyuk, I. Savysyuk, and R. Zaremba. "SiO2 β-C." In Landolt-Börnstein - Group III Condensed Matter, 134. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-22847-6_84.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, V. Kuprysyuk, and I. Savysyuk. "SiO2 RUB-24." In Structure Types. Part 9: Space Groups (148) R-3 - (141) I41/amd, 821. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02702-4_594.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, V. Kuprysyuk, and I. Savysyuk. "SiO2 Sigma-2." In Structure Types. Part 9: Space Groups (148) R-3 - (141) I41/amd, 842. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02702-4_614.

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Gasparik, Tibor. "System MgO-SiO2." In Phase Diagrams for Geoscientists, 13–31. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-5776-3_2.

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Gasparik, Tibor. "System MgO-SiO2." In Phase Diagrams for Geoscientists, 13–31. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-38352-9_2.

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Jacob, A., A. Gray-Weale, and P. J. Masset. "Molecular Dynamics Simulation of SiO2 and SiO2-CaO Mixtures." In Molten Salts Chemistry and Technology, 171–80. Chichester, UK: John Wiley & Sons, Ltd, 2014. http://dx.doi.org/10.1002/9781118448847.ch3d.

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Young, D. R. "Charge Trapping in SiO2." In The Physics and Chemistry of SiO2 and the Si-SiO2 Interface, 487–96. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4899-0774-5_54.

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Conference papers on the topic "SiO2"

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Katz, E. J., Z. Zhang, H. L. Hughes, K. B. Chung, G. Lucovsky, and L. J. Brillson. "Nanoscale depth-resolved electronic properties of SiO2/SiOx/SiO2 gate dielectrics for radiation-tolerant electronics." In 2009 International Semiconductor Device Research Symposium (ISDRS 2009). IEEE, 2009. http://dx.doi.org/10.1109/isdrs.2009.5378032.

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Mitsuhashi, J., K. Sugimoto, M. Hirayama, S. Sadahiro, and T. Matsukawa. "TDDB Measurements of SiO2 Gate and SiO2/Si3N4/SiO2 Gate Structure." In 1985 Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 1985. http://dx.doi.org/10.7567/ssdm.1985.c-2-2.

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Liao, Zhen-Liang, Ricky W. Chuang*, and Chih-Kai Chang. "Integrated Optical Beam Splitters Employing Symmetric Mode Mixing in SiO2/SiON/SiO2 Multimode Interference (MMI) Waveguides." In 2006 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2006. http://dx.doi.org/10.7567/ssdm.2006.b-8-4l.

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Chovan, Jozef, Daniel Figura, Juraj Chlpík, Dušan Lorenc, Vlastimil Řeháček, and František Uherek. "Design, fabrication and characterization of SiOx/SiON/SiO2/Si structures for passive optical waveguides realization." In Photonics Prague 2017, edited by Petr Páta and Karel Fliegel. SPIE, 2017. http://dx.doi.org/10.1117/12.2295305.

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Dash, Suryadeepta, S. Panda, B. Maji, and A. K. Mukhopadhyay. "Comparative thermal noise analysis of DG MOSFET using SiO2, SiC-SiO2, Si3N4-SiO2, SiO2-Al2O3 as dielectric layer." In 2011 International Conference on Communication and Industrial Application (ICCIA). IEEE, 2011. http://dx.doi.org/10.1109/iccinda.2011.6146690.

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Onanko, A. P., M. P. Kulish, O. V. Lyashenko, G. T. Prodayvoda, S. A. Vyzhva, and Y. A. Onanko. "Inelastic-elastic properties of SiO2, SiO2 + TiO2 + ZrO2." In 2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE). IEEE, 2012. http://dx.doi.org/10.1109/omee.2012.6464790.

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Chu, Jack O., George W. Flynn, Peter D. Brewer, and Richard M. Osgood. "Laser-Initiated Dry Etching of SiO2." In Microphysics of Surfaces, Beams, and Adsorbates. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/msba.1985.tuc5.

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In general photochemical (drying etching) process of thin films based on (UV) laser-initiated chemistry is difficult to investigate both mechanistically and kinetically. Some of the most important questions are concerned with the photo-formation of the reactive species and their (reactive) chemical interaction with the surface. The UV-laser assisted etching of SiO2 from photolysis of CH2 CHF is quite attractive for mechanistic studies of the etching process because of the relative simple (in-situ) application of IR (time-resolved) fluorescence and absorption techniques to monitor both the HF etchant and the SiF4 products within the gas-surface system. The strong oscillator and absorption strength of the HF molecules makes it possible to monitor its photo-production and follow the subsequent etching reaction with the SiO2 surface. Moreover, high resolution and sensitive diode laser absorption probes can be used to investigate the surface products (SiF4, SiF3, SiF2 and SiF) in the gas phase.
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Jäger, C., K. Glock, and B. Thomas. "NMR and IR study of the functionality of electrode glasses." In Bragg Gratings, Photosensitivity, and Poling in Glass Fibers and Waveguides. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/bgppf.1997.jsue.38.

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During conditioning of glass electrodes in aqueous solutions a hydrated layer is formed, which is responsible for the pNa+ sensitivity. For a detailed understanding of this effect the structure of the bulk glass as well as of the hydrated layer is of particular importance. 27Al and 11B MAS NMR were used to investigate Na2O-Al2O3-SiO2 and Na2O-B2O3-SiO2 glasses. The 27Al MAS spectra can be interpreted in terms of two different structural units. We can distinguish between AlO4 tetrahedra connected to Q4 groups only and AlO4 tetrahedra linked to Q3m groups. In a similar way two BO4 units can be detected which are linked to SiO4 units or BO3. In both cases only one of the two structural units is removed during the reaction in hydrous solution which can easily be concluded from the changes of the 11B and 27Al MAS lineshape. In summary criteria for a good pNa+ sensitivity could formulate in terms of certain structural units which must be present in the bulk glass. Also, the swelling layer must contain a large content of Q4 and the H2O/SiOH ratio must be sufficiently high.
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KURODA, Shigeki, Kenji NISHI, and Jun UEDA. "Dry Oxidation Study on CVD-SiO2/Thermal-SiO2/Si Structure." In 1989 Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 1989. http://dx.doi.org/10.7567/ssdm.1989.a-4-1.

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Watanabe, T., N. Goto, N. Yasuhisa, T. Yanase, T. Tanaka, and S. Shinozaki. "Highly Reliable Trench Capacitor With SiO2/Si3N4/SiO2 Stacked Film." In 25th International Reliability Physics Symposium. IEEE, 1987. http://dx.doi.org/10.1109/irps.1987.362154.

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Reports on the topic "SiO2"

1

Дядына, Г. А., В. Г. Карпов, and Володимир Миколайович Соловйов. Низкоэнергетические возбуждения в α-SiO2. ФТИ им. А.Ф.Иоффе, 1990. http://dx.doi.org/10.31812/0564/1015.

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Проведено моделирование мягких атомных потенциалов в a-SiO2. Выявлены параметры, определяющие форму атомного потенциала. Изучены микроскопическая структура мягких атомных потенциалов, характерные значения их параметров и картина атомных движений. Установлено, что движение атома кислорода по мягкой моде сопровождается когерентными перемещениями других атомов. Характер движений близок к результатам, установленным по данным нейтронного рассеяния. Когерентные перемещения атомов приводят к возрастанию эффективной массы атомной частицы и плотности колебательных возбуждений (бозонного типа) в мягких одноямных потенциалах.
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Liu, Q., and E. A. Irene. Si/SiO2 Interfere Studies by Immersion Ellipsometry. Fort Belvoir, VA: Defense Technical Information Center, May 1993. http://dx.doi.org/10.21236/ada265151.

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Cochrane, Kyle. Critical point calculations of BSE and SiO2. Office of Scientific and Technical Information (OSTI), November 2016. http://dx.doi.org/10.2172/1733251.

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Ohta, Taisuke. graphene/SiO2/Si wafer PEEM summary sample#01. Office of Scientific and Technical Information (OSTI), March 2017. http://dx.doi.org/10.2172/1346337.

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Chizmeshya, A., A. Demkov, T. Lenosky, and O. Sankey. Energetics of crystalline silicon dioxide-silicon (SiO2/Si) interfaces. Office of Scientific and Technical Information (OSTI), July 1999. http://dx.doi.org/10.2172/13850.

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Vinci, R., T. Delph, and R. Jaccodine. Determination of SiO2 Mechanical Behavior Via High Temperature Microtensile Testing. Fort Belvoir, VA: Defense Technical Information Center, January 2001. http://dx.doi.org/10.21236/ada413920.

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Hay, Randall S. Growth Stress in SiO2 during Oxidation of SiC Fibers (Preprint). Fort Belvoir, VA: Defense Technical Information Center, November 2011. http://dx.doi.org/10.21236/ada553603.

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Yakovlev, V. A., and E. A. Irene. An Interface Enhanced Spectroscopic Ellipsometry Technique: Application to Si-SiO2. Fort Belvoir, VA: Defense Technical Information Center, November 1991. http://dx.doi.org/10.21236/ada242867.

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Hudspeth, Matthew, Joe Olles, James Williams, Anirban Mandal, Seth Root, and Seth Vogler. Strength of porous alpha-SiO2 in a shock loaded environment. Office of Scientific and Technical Information (OSTI), August 2019. http://dx.doi.org/10.2172/1762993.

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Stepacheva, Antonina, Mariia Markova, Oleg Manaenkov, and Mikhail Sulman. Lignin valorisation in the presence of SiO2@Polymer supported catalysts. Peeref, June 2023. http://dx.doi.org/10.54985/peeref.2306p1863432.

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