| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Deubener, Joachim
Clausthal University of Technology
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (26/26 displayed)
- 2024Optical Real-Time Castability Evaluation for High-Throughput Glass Melting
- 2024Non-monotonic dependence of high-temperature stability of stone wool fibres on pre-oxidation time and temperaturecitations
- 2023Viscous Sintering of Acid Leached Glass Powderscitations
- 2023Viscous Sintering of Acid Leached Glass Powders
- 2023Oxidation and coordination states assumed by transition metal dopants in an invert ultrabasic silicate glasscitations
- 2022Determination of cooling rates of glasses over four orders of magnitudecitations
- 2021Re-use potential of carbon fibre fabric recovered from infusible thermoplastic CFRPs in 2nd generation thermosetting-matrix compositescitations
- 2021Reducing the raw material usage for room temperature infusible and polymerisable thermoplastic CFRPs through reuse of recycled waste matrix materialcitations
- 2021A threshold heating rate for single-stage heat treatments in glass-ceramics containing seed formerscitations
- 2021Spray-dried sol-gel glass-ceramic powders based on the tunable thermal expansion of quartz and keatite solid solutionscitations
- 2020Water in Alkali Aluminosilicate Glassescitations
- 2020Spray-dried TiO2(B)-containing photocatalytic glass-ceramic nanobeadscitations
- 2020Inversion of quartz solid solutions at cryogenic temperaturescitations
- 2020Effect of TiO2 and 11 minor elements on the reactivity of ground‐granulated blast‐furnace slag in blended cementscitations
- 2020Automated analysis of slow crack growth in hydrous soda-lime silicate glassescitations
- 2018Kinetics of Decelerated Meltingcitations
- 2016The TTT Curves of the Heterogeneous and Homogeneous Crystallization of Lithium Disilicate - A Stochastic Approach to Crystal Nucleationcitations
- 2016Bulk elastic properties, hardness and fatigue of calcium aluminosilicate glasses in the intermediate-silica rangecitations
- 2014Influence of thermal history on micro-mechanical properties of earth-alkaline aluminosilicate glasses
- 2014Irreversibility of pressure induced boron speciation change in glass
- 2013Environmental effects on fatigue of alkaline earth aluminosilicate glass with varying fictive temperaturecitations
- 2011Towards ultrastrong glassescitations
- 2010Impact of cationic diffusion on properties of iron-bearing glass fibres
- 2009Inward Cationic Diffusion and Formation of Silica-Rich Surface Nanolayer of Glasscitations
- 2008Modification of the glass surface induced by redox reactions and internal diffusion processes
- 2004Relaxation of Anisotropic Glasses
Places of action
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article
Inward Cationic Diffusion and Formation of Silica-Rich Surface Nanolayer of Glass
Abstract
This paper reports a chemical approach for obtaining a silica-rich nanolayer on the surface of a vanadium-bearing silicate glass. The approach involves depletion of earth alkaline ions (Mg<sup>2+</sup> and Ca<sup>2+</sup>) from the glass surface by means of inward diffusion of those ions, i.e., diffusion from the surface to the interior of the glass. The inward diffusion is induced by the reduction of V<sup>5+</sup> to V<sup>4+</sup> ions, when the glass is heat-treated in H<sub>2</sub>/N<sub>2</sub> (1/99 v/v) at the glass transition temperature (<em>T</em><sub>g</sub>) for certain durations (<em>t</em><sub>a</sub>). During the reduction of vanadium by H<sub>2</sub>, structurally bonded hydroxyl groups form and are incorporated into the glass structure. Both the V<sup>4+</sup> and the hydroxyl contents increase with increasing <em>t</em><sub>a</sub> and hydrogen partial pressure. The inward diffusion enhances the hardness of the glass surface. The mechanism of the inward diffusion is suggested on the basis of a model describing the outward diffusion. The new approach provides a possibility to create a silica-rich nanolayer on glass surfaces by means of the inward diffusion process.