Academic literature on the topic 'Verre de borosilicate'
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Journal articles on the topic "Verre de borosilicate":
Mai, C., S. Etienne, H. Satha, and J. Perez. "Etude et analyse de la deformation non-elastique autour de la transition vitreuse d'un verre borosilicate." Acta Metallurgica et Materialia 38, no. 2 (February 1990): 337–43. http://dx.doi.org/10.1016/0956-7151(90)90064-n.
Capilla, Xavier, Daniel Coillot, and Eric van Hullebusch. "L’industrie du verre en France." Matériaux & Techniques 110, no. 4 (2022): 401. http://dx.doi.org/10.1051/mattech/2022023.
Frizon, Fabien, Sara Depierre, Frédéric Angeli, and Stéphane Gin. "Altération d’un verre nucléaire borosilicaté en eau cimentaire : effets antagonistes du calcium." Revue Générale Nucléaire, no. 5 (October 2013): 93–98. http://dx.doi.org/10.1051/rgn/20135093.
Muller, P., and M. Schvoerer. "Effet d'une forte irradiation α et d'une recristallisation sur la thermoluminescence d'un verre borosilicaté." Physica Status Solidi (a) 123, no. 2 (February 16, 1991): 369–77. http://dx.doi.org/10.1002/pssa.2211230203.
RIBET, Isabelle, and Nicole GODON. "Altération par l'eau des verres borosilicatés - Exemple des verres nucléaires." Verres et céramiques, December 2014. http://dx.doi.org/10.51257/a-v1-cor450.
Dissertations / Theses on the topic "Verre de borosilicate":
Poirot, Isabelle. "Etude du neptunium dans un verre borosilicate." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb376004621.
Cachia, Jean-Nicolas. "Solubilité d'éléments aux degrés d'oxydation III et IV dans les verres de borosilicate." Montpellier 2, 2005. http://www.theses.fr/2005MON20165.
Bouteille, Barbara. "Séparation de phase dans les couches minces de verre pour la nanostructuration de surface." Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS249.
This work aims at creating nanostrcutures which size can be controlled from a planar glass thin film of 100~nm deposited by reactive magnetron sputtering, thanks to phase separation phenomenon. The model ternary system used is a barium borosilicate because its immicibility domain is large. After demixing the barium rich phase has strong electronic contrast favorable for SEM imaging. Moreover this less polymerized phase can be selectively dissolved to reveal nanostructures. Three different morphologies are finally obtained varying thin films composition : holes, pillars or interconnected roughness. Image processing from SEM and AFM measurements allows quantitative measurements of characteristic lengths such as vertical and horizontal size and lateral correlations. Coarsening kinetics in ultra-confined media are studied for both mechanisms nucleation and growth and spinodal decomposition. Particularly, for droplets assembly with only one object into the thickness, confinement slows down diffusion. This impact is shown experimentally and numerically, it gives a power law slower than classical models. For 2D interconnected network, hydrodynamic growth is quickly interrupted by fragmentation and destabilises the free surface leading to rough samples
Pacaud, Fabien. "Étude des propriétés physicochimiques de verres borosilicatés et de borosilicates de lanthane par dynamique moléculaire à partir d’un champ de force polarisable." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066504/document.
As result of the nuclear waste vitrification, the knowledge and understanding of the dynamic and structural properties of glasses, including the behavior of radionuclides, is important (in liquid and solid phases). It can influence the glass waste properties, the lifetime of the vitrification process and the amount of radionuclides introduced in the glass matrix. Molecular dynamic simulations have been done to study the influence of the glass matrix composition into the structural and dynamic properties of the glass. A simplified glass, with 3 major oxides of the R7T7 glass such as SiO2, B2O3 and Na2O, have been used to simulate the R7T7 industrial nuclear glass (a 30 oxides glass). The inclusion of La2O3 allows us to simulate the impact of fission products and minor actinides into the properties of the glass matrix. Both systems, the SiO2-B2O3-Na2O and SiO2-B2O3-Na2O-La2O3, allow us to study the sodium and lanthanum effect on the properties of the glass. During this work, a polarizable force field has been developed to do these simulations. The results obtained at room temperature let us reproduce the experimental results of the structure, the distribution of BIII/BIV and the density. A study has been done on the viscosity and electrical conductivity of the liquid. The distribution BIV/BIII and the influence of the structural changes on the density along with the temperature have also been observed with thermal quenchings. The current limits of this approach are also described
Bouttes, David. "Micro-tomographie d’un borosilicate de baryum démixé : du mûrissement à la fragmentation." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066302/document.
We use a barium borosilicate glass as a model system to study phase separation in liquids. We consider here the coarsening process in the viscous hydrodynamical regime, where the characteristic length scale grows linearly with time : ∼ (γ/η)t, with η the viscosity and γ the interfacial tension. The system is initially bicontinuous, which is mandatory for this growth regime.X-ray microtomography experiments are performed in situ at the ID19 beamline of the European Synchrotron Radiation Facility (ESRF) in order to obtain the morphology of the domains. We developed dedicated image processing routines for the analysis of the 3D images. We computed the volumes and surface areas of the domains, chord-length distributions, the Euler characteristic as well as local mean and Gaussian curvatures. Dynamic scaling hypothesis predicts a self-similar growth, which served as a basis for the discussion of these measurements. The glass separates in two phases with a very high viscosity contrast (several orders of magnitude). The main control parameter in our experiments is then the volume fraction of the less viscous phase. When this low-viscosity phase is the minority one, it undergoes a gradual fragmentation that eventually stops the coarsening. This fragmentation process bears self-similar features, which result in a wide distribution of domains sizes. We indeed predict a power-law distribution. More generally, we observed that the coarsening process follows the dynamic scaling hypothesis as long as fragmentation remains insignificant
Pablo, Hélène. "Diffusion chimique dans les verres borosilicates d'intérêt nucléaire." Thesis, Paris, Muséum national d'histoire naturelle, 2017. http://www.theses.fr/2017MNHN0014/document.
Chemical diffusion is a key-phenomenon during nuclear glass synthesis. At high temperature, diffusion leads to homogenization of the melt contributing to the transformation of heterogeneous waste and frit precursors to a homogeneous glass after cooling. In contrast, in the supercooled liquid, diffusion is a critical factor affecting phase separation and/or crystallization processes that must be avoided when producing a high quality final product.In this manuscript, the impact of chemical diffusion on crystallization and liquid homogenization is studied for a simplified sodium borosilicate glass between its glass transition temperature and its synthesis temperature. For this kind of system, qualified as multicomponent, the description of diffusive phenomena requires the calculation of a diffusion matrix that takes into account diffusive couplings between species. These couplings can be written in the form of diffusive mechanisms or “diffusive exchanges” that are invariant with temperature. The activation energies associated with these exchanges are close to the activation energy of shear viscosity which suggests that viscous flow and chemical diffusion are driven by a single mechanism related to the frequency of Si-O and B-O bond breaking. It is also highlighted that in the supercooled liquid, the principal diffusive exchange (SiO2-Na2O) and the secondary diffusive exchange (SiO2-B2O3) play a significant role on the kinetics and direction of growth of crystalline phases which are formed in our system. These results are used to rationalise the evolution of compositional gradients in the vicinity and far from crystals. In the last part of this work, a complexification of the glasses was initiated by adding lanthanum to simulate one of the main lanthanides of the R7T7 nuclear glass composition. The data collected reveal diffusive couplings between lanthanum and silicon. These couplings, combined with the other results explain the formation of a lanthanum borosilicate phase (LaBSiO5)
Lizzi, Federico. "Phase separated borosilicate glasses for dental applications : mixture design in relation with the ion release in acid condition and microstructure." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1076/document.
The research for efficient dental materials has been a constant throughout the history of dentistry. As better materials emerged, the development of ever more innovative materials has been pushed forward. Moreover the combination of different sciences such as chemistry, biology, physics and engineering has provided better knowledge to the demanding requirements of the dental restorations. The BIODENSOL project is a European commission funded mobility research project managed by the University of Lyon and LUCIDEON Ltd, Stoke-on-Trent, UK. The project is designed to help building relations between academic and commercial research to enhance medical innovations and associates solid state chemists and hospital practicioners in direct contact with the patients with dental problems. This project proposes three PhD studies to address the problems of caries and enamel erosion by acidic foods (leading to sensitive teeth) encouraging re-mineralization to help avoid these problems. The researches independently evolved in three different routes investigating three different materials that could provide potential solutions. The main objective of this thesis concerns the study of Borosilicate phase separated glass powders for glass ionomer cements. As silicate bioglasses developed by Hench in 1969, regarding their bioactivity and antimicrobial properties, borosilicates glasses are promising materials and have been widely studied for biomedical applications for scaffolds in soft tissues and for bone repair and could be of interest in dentistry. The glass system studied here is a borosilicate glass (SiO2-K2O-B2O3-CaO-Al2O3) with a strong tendency to phase separate. The objective of this work is to characterize a series of the novel borosilicate formulations and to understand the mechanism and kinetic of dissolution related to their microstructure and composition. The use of thermal treatment to promote phase separation as a means of influencing the rate of ion leaching was especially studied. The dissolution process of borosilicates in neutral body solution (simulating body fluid) or in acid solution (simulating scenarios where bacteria or acid foods are present) provides information regarding the type and concentration of species released by the glass. Different compositions have been investigated in which SiO2 and K2O are fixed while the other elements are varied in order to assess the effect on the phase separation. As the novel borosilicates produced with the meltquenching technique is immersed in an aqueous environment, B-, Si-, Ca-, K- and Al- species are released to different degrees as a function of the time. Ion leaching trends can be related to the glass chemistry and microstructure. It has been shown that the amorphous phase separation (APS) causes an initially homogeneous single phase to separate into two or more phases of different compositions. The degree of interconnectivity of the two glass phases depend on the nature of the phase separation mechanism. This process can occur by a nucleation and growth process which gives isolated spherical particles or by spinodal decomposition where an interconnected structure is obtained. It is significant that before a heat-treatment the glasses are optically clear, but turn opalescent to different degrees following a heat treatment depending on the wt% of the elements in the composition. The pattern of the ion release implies that one of the phases is more reactive and susceptible to acid attack and will be leached out from the glass earlier. The other phase will remain in the cement improving the mechanical properties of the dental restorative material. Moreover, the mixing of the glass powder with a commercial poly(acrylic acid) has shown interesting mechanical and bioactive properties. This work showed how the ions leaching are influenced by the glass composition and the heat-treatment... [etc]
Jouglard, Dylan. "Propriétés électriques de verres d'intérêt nucléaire." Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE2036/document.
The vitrification of high-level nuclear waste is an important step to master in order to ensure their immobilization. Since 2010, a cold crucible induction melter is used in the La Hague plant due to its advantages. This process is based on electromagnetic currents directly induced on the load of the crucible whose walls are water-cooled. Thanks to the thermal gradient established between these cooled walls and the molten glass, a solid glass layer called self-crucible is created which protects the crucible from corrosion effects and acts as an electrical insulator. Due to their complex composition and microstructure, the study of electrical and dielectric properties of nuclear glasses and the understanding of the related phenomena are necessary in order to efficiently master the cold crucible process and the associated thermo-hydraulic simulations.This study is dealing with the description of the electric charge motion phenomena involving the electrical and dielectric properties of the nuclear borosilicate glasses. Relationships between these properties, the composition and the microstructure are also given. These issues are firstly broached through the investigation of two industrial inactive glasses of complex composition thanks to microstructure characterizations and complex impedance measurements in the solid-state. A more detailed description of the phenomena is performed thanks to the characterization of simplified glasses containing 5 oxides (SiO2-B2O3-Na2O-CaO -RuO2 or -MoO3) allowing a better understanding of the charge motion according to the electrical field frequency, the temperature, the composition and the microstructure of the material
Diallo, Babacar. "Etude structurale des phénomènes de séparation de phases dans des verres d'oxydes aluminosilicatés et borosilicatés : application à la synthèse de vitrocéramiques." Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE3014.
Phase separation phenomena in glasses correspond to the formation of heterogeneities during melting,quenching, or any other heat treatment. These heterogeneities modifies the homogeneity and thephysicochemical properties of glasses in the liquid state and can affect shaping operation of glasses. Thus,phase separation study is particularly interesting in the context of glasses formulation and glass-ceramicssynthesis. Indeed, the microstructures induced by the phase separation often lead to regularly distributedvitreous domains in a vitreous matrix, which can be crystallized under an appropriate heat treatment. So, thestructural modifications generated by the phase separation in ternary lanthanum aluminosilicate LaAS,lanthanum borosilicate LaBS and barium borosilicate BaBS is studied by using high resolution solid state NMRto understand the structural changes caused by the phase separation for glass ceramics synthesis
Hongisto, Mikko. "Développement de verres et vitrocéramiques dopés ytterbium pour l'optique et réponses sous différents types de traitements." Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0040.
This thesis studies the modification of the properties of glass compounds doped with Yb3+ ions, through variations in composition, thermal or radiation treatments as well as by immersion in aqueous medium. New Yb3+ doped oxyfluorophosphate glass/glass-ceramics have been developed and characterized to obtain fundamental information on crystallization. The study also proposes the development of cylindrical and rectangular bioactive fibers based on doped and non-doped borosilicate glass constituting the core and the clad of the fiber respectively. The stability of these fibers in aqueous medium is monitored according to the geometry. This study also provides information on resistance to defects depending on the nature of the network and on the development of new bioactive fibers, the emission of which could be used to follow the dissolution of the fiber in aqueous medium. This study contributes to a better fundamental understanding of how composition changes and thermal/radiation processes can modulate the performance parameters of glass materials doped by Yb3+ ions