Letteratura scientifica selezionata sul tema "Titane – Composés – Propriétés physico-chimiques"
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Articoli di riviste sul tema "Titane – Composés – Propriétés physico-chimiques":
Anthoine, G., J. Nasielski, E. Vander Donckt e N. Vanlautem. "Propriétés Physico-Chimiques De Composés À Caractère Aromatique X (). Réduction polarographique de composés monoaza-aromatiques N-oxydés". Bulletin des Sociétés Chimiques Belges 76, n. 3-4 (2 settembre 2010): 230–43. http://dx.doi.org/10.1002/bscb.19670760307.
Anthoine, G., J. Nasielski e B. Wilmet-Devos. "Propriétés physico-chimiques de composés caractère aromatique. potentiels de demi-onde de réduction polarographique d'aldéhydes polycycliques aromatiques". Bulletin des Sociétés Chimiques Belges 78, n. 9-10 (2 settembre 2010): 465–69. http://dx.doi.org/10.1002/bscb.19690780904.
Monties, Bernard. "Composition chimique des bois de chêne: composés phénoliques, relations avec quelques propriétés physiques et chimiques susceptibles d'influencer la qualité des vins et des eaux-de-vie". OENO One 21, n. 3 (30 settembre 1987): 169. http://dx.doi.org/10.20870/oeno-one.1987.21.3.1282.
Anthoine, G., G. Coppens, J. Nasielski e E. Vander Donckt. "Propriétés Physico-Chimiques de Composés À Caractère Aromatique VIII. Potentiels de demi-onde de réduction polarographique de dérivés monoaza-aromatiques". Bulletin des Sociétés Chimiques Belges 73, n. 1-2 (2 settembre 2010): 65–72. http://dx.doi.org/10.1002/bscb.19640730109.
Nasielski, J., e E. Vander Donckt. "Propriétés Physico-Chimiques de Composés à Caractère Aromatique VII Étude par L.C.A.O. de l'intensité et de la position de la transition 1La de composés monoaza-aromatiques(1)". Bulletin des Sociétés Chimiques Belges 72, n. 11-12 (2 settembre 2010): 725–39. http://dx.doi.org/10.1002/bscb.19630721108.
BLEUKX, W. "Production et qualité nutritionnelle des phosphates alimentaires". INRAE Productions Animales 18, n. 3 (15 luglio 2005): 169–73. http://dx.doi.org/10.20870/productions-animales.2005.18.3.3521.
Fan, Bo Tao, F. Simmonet e G. Lapluye. "Études physico-chimiques de propriétés de membrane basale. II. Diffusion de composés organiques — — étudiée par la mesure en continu de la radioactivité". Journal de Chimie Physique 83 (1986): 673–79. http://dx.doi.org/10.1051/jcp/1986830673.
Lespes, G., C. Bancon-Montigny, S. Aguerre e M. Potin-Gautier. "Spéciation des organoétains dans les eaux et sédiments du bassin Adour-Garonne". Revue des sciences de l'eau 18, n. 1 (12 aprile 2005): 47–63. http://dx.doi.org/10.7202/705549ar.
Coppens, G., J. Nasielski e N. Sprecher. "Propriétés physico-chimiques de composés à caractère aromatique VI. Association par lien H entre le méthanol et quelques bases monoazaaromatiques dans le Tétra chlorure de carbone (1)". Bulletin des Sociétés Chimiques Belges 72, n. 9-10 (2 settembre 2010): 626–31. http://dx.doi.org/10.1002/bscb.19630720908.
Ogan, Paul Ezin, Eben-Ezer Ewedje, Kowiou Aboudou, Faustin Yédjanlognon Assongba, Sènan Vodouhe-Egueh, Julien Djego e Mohamed Mansourou Soumanou. "Evaluation de la qualité physicochimique et microbiologique du vinaigre issu de la pulpe de prunier mombin (Spondias mombin L.) produit au Bénin". European Scientific Journal, ESJ 18, n. 40 (31 dicembre 2022): 425. http://dx.doi.org/10.19044/esj.2022.v18n40p425.
Tesi sul tema "Titane – Composés – Propriétés physico-chimiques":
Benyahia-Bentadjine, Sonia. "Mécanismes de formation et propriétés physico-chimiques et mécaniques des interphases epoxy-diamine/métal". Lyon, INSA, 2000. http://www.theses.fr/2000ISAL0025.
The interfacial reactivity between epoxy (DGEBA) and diamine (IPD) monomers and metallic substrates (titanium, aluminum and gold) has been studied using various analytical techniques. Chemical, physical and mechanical properties of organic coatings were determined as a function of their thickness and compared to bulk values. An interphase having specific properties and quite different to polymer bulks ones was underlined. Interphase properties were found to be affected by the substrate nature, metallic surface treatments, the diamine nature (whether aromatic, aliphatic or cycloaliphatic) and the stoechiometric ratio of epoxy-amine mixture. Reaction mechanisms leading to the interphase formation were determined by studying "modified" monomers by hydrated oxide layer. It was found that the diamine monomer reacts with the metallic surface and induces a chemical etching. Then metallic ions then diffuse through the organic layer to form metal-amine complexes. When a saturation threshold was reached, crystals of modified monomers were observed at room temperature. These complexes induce phase separation during the cure cycle of the epoxydiamine mixture leading to a new network formation. The understanding of these phenomena, allows us to produce bulk materials having the same properties than thin films or interphase
Guillot, Jérôme. "Couches minces d'oxynitrure de titane : la réactivité comme moyen original de caractérisation physico - chimique". Phd thesis, Université de Bourgogne, 2002. http://tel.archives-ouvertes.fr/tel-00101455.
L'objectif de ce travail était la détermination de la composition et de la structure des couches minces de TiNxOy de façon à en comprendre les propriétés électriques. Cependant, cette étude s'est rapidement avérée plus complexe que prévue, les techniques de caractérisation classiques (MEB, DRX, Raman, XPS...) étant insuffisantes pour décrire le système TiNxOy dans sa totalité. En effet, une seule phase cristallisée, isomorphe de TiN, a pu être mise en évidence dans les échantillons élaborés à haute température (T > 550 °C) tandis que des analyses quantitatives ont révélé des proportions d'oxygène relativement importantes dans tous les échantillons. Aussi, cette étude a été élargie à des films de TiN afin de comprendre l'importance de l'oxygène dans cette structure.
Des méthodes de caractérisation originales, basées sur le fait qu'il est possible de relier la structure d'un matériau à sa réactivité, ont alors été mises en œuvre afin de compléter les analyses précédentes. Notamment, l'étude de la réactivité des couches minces vis-à-vis d'une irradiation ionique ou lors de traitements thermiques a permis de qualifier et quantifier les différentes phases des films minces de TiNxOy en réalité constitués d'une phase Ti(N,O) conductrice et d'une phase TiO2 isolante. Un modèle de percolation permettant la simulation des variations de conductivité des films à partir des proportions relatives de chacune de ces deux phases a alors pu être proposé.
Mangold, Lucas. "Étude multi-techniques et multi-échelles de la spéciation du titane(IV) dans l’acide phosphorique concentré". Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0025.
The conventional wet-process of production of phosphoric acid consists of a leaching of phosphate ores with sulfuric acid during which several impurities (metallic, sulfate, chloride are dissolved concomitantly. Phosphoric acid and phosphate salts are used in various applications such as fertilizers, food additives, electronic etching agent or pharmaceutical excipients and must therefore meet appropriate of specifications regarding their purity. As a consequence, the concentration of these impurities must be reduced by performing purification steps. At the industrial scale, the purification of phosphoric acid is performed mainly by liquid-liquid extraction. The operation consists in extracting as selectively as possible the phosphoric acid molecules initially contained in the leaching juice into an appropriate organic phase. However this process is not selective enough and some of the impurities are co-extracted. This leads to the necessity of performing additional purification steps to meet the requested specifications, which increases both the complexity of the global treatment and its cost. The knowledge of the speciation of impurities in concentrated phosphoric acid is essential to understand the physicochemical reasons for their co-extraction and, in fine, to design more selective extraction solvents. For example, the solvents presently used for the purification of H₃PO₄ are not selective enough against titanium(IV). Thus, this PhD thesis work aims at characterizing the speciation of this metal in a large range of phosphoric acid concentration, in order to identify subsequently the equilibria responsible for its co-extraction with H₃PO₄. This thesis is based on an original approach combining the use of spectroscopic and molecular modeling techniques. Synthetic solutions containing both titanium(IV) and phosphoric acid have been characterized using different spectroscopic techniques including UV-Visible, Nuclear Magnetic Resonance (³¹P NMR) and X-Ray Absorption (XAS) spectroscopies. Thus, the structure of the complexes formed in phosphoric acid has been studied by comparing UV-Visible spectra and calculations implementing time-dependent density functional theory (TD-DFT). The nuclearity of these complexes has also been estimated by comparing the values of the self-diffusion coefficients determined experimentally by ³¹P NMR with the values calculated by molecular dynamics for different species of titanium (IV) potentially present in solution. The coordination of titanium (IV) was also studied by analyzing the EXAFS (Extended X-Ray Absorption Fine Structure) spectra using ab-initio molecular dynamics simulations explicitly taking into account the solvation of the complexes.Finally, UV-Visible spectral data have been analyzed by a chemometric approach, based on a principal component analysis (PCA), allowing us to extract quantitative information about the distribution of the complex species identified in concentrated phosphoric acid. From all these results, it was possible to propose for the first time a diagram of speciation of titanium (IV) in phosphoric acid for a range of concentrations between 6 and 13 mol.L⁻¹, underlining the evolutionary presence of three mono- and poly-nuclear titanium (IV) complexes, the predominant species of which is [Ti(OH)(H₃PO₄)₂(H₂PO₄)]²⁺
Termoss, Hussein. "Préparation de revêtements de nitrure de bore (BN) par voie polymère précéramique : étude des paramètres d’élaboration : caractérisations physico-chimiques". Thesis, Lyon 1, 2009. http://www.theses.fr/2009LYO10145/document.
The aim of this work was to prepare boron nitride coatings onto different substrates using the Polymers Derived Ceramics (PDCs) approach. In that way, BN coatings were obtained onto graphite, pure silica and metal especially titanium. The first part of this thesis was to study parameters (of the solution used and of the dip-coating process), to obtain the best coatings in terms of morphology, cristallinity and chemical composition. The second part was dedicated to BN coatings obtained onto metal substrates using an alternative thermal treatment allowing the polymer-to-ceramic conversion without any damage for the metal. Actually, annealing by infrared irradiation allows heating only the coating, energy being reflected by the metal
Le, Goff Xavier. "Elaboration et étude des propriétés physico - chimiques de nouveaux composés magnétiques". Phd thesis, Université Sciences et Technologies - Bordeaux I, 2006. http://tel.archives-ouvertes.fr/tel-00811528.
Durand, Morgan. "Propriétés physico-chimiques, fonctionnelles et applicatives des éthers courts d’isosorbide". Thesis, Lille 1, 2010. http://www.theses.fr/2010LIL10196/document.
In the last past years, an increasing awareness of the hazards linked to the use of solvents has strengthened the regulation and forced to optimize their use. This evolution entailed an increasing interest for bio-solvents, i.e. solvents from renewable materials and with good health and environmental properties. In this context, isosorbide, a diol obtained by the double deshydratation of sorbitol, might be valuable synthon for the design of a wide range of molecules and polymers. The short isosorbide diethers (_ 5 carbones per alkyl chain), as they are biosourced and liquid at ambient temperature, are potentialy promising solvents, that is why they have been studied. The monomethyl isosorbides (-endo et -exo forms) have also been evaluated, as they are the main impurities of the commercial dimethyl isosorbide (DMI), the most promising compound of this solvents family. The physicochemical, functional and applicative properties that are necessary to the characterization and the use of new solvents have been assessed : the thermo-physical properties (vapor pressure, vaporization enthalpy), the optical and electrical properties (refractive index, dielectric constant, dipole moment), the functional properties (viscosity, partition coefficient, Kamlet et Taft solvatochromic parameters) have been measured. The environmental, health and safety profile of DMI has been determined and compared to common solvents, allowing the evaluation of its "greenness". As DMI is fully miscible with water, its physicochemical properties in aqueous solutions have been studied as well, and have enlightened a self-aggregation of DMI within a large concentration range.A solvent design process has then been developped in order to estimate the potential use of these new solvents. A novel approach for the classification of solvents has been proposed, based solely on the solvent molecular structure and relying on the "COnductor-like Screening MOdel for Real Solvents" (COSMO-RS) in which solvents are considered in their liquid state. This approach has allowed the classification of 152 solvents into 10 classes without requiring the knowledge of any experimental data. The approach has been applied to DMI and allowed to find some potential applications that have been evaluated, among which the use of DMI as fluxing agent for bitumen composition, coalescing agent for water-borne paints, solvent for paint strippers, solvent for ink removal, or coupling agent for the formulation of liquid detergents
Ramaroson, Jocelyn. "Calcination des sédiments de drapage contaminés : études des propriétés physico-chimiques". Lyon, INSA, 2008. http://theses.insa-lyon.fr/publication/2008ISAL0010/these.pdf.
The work presented deals with the NOVOSOL ® process developed by SOL V A Y S. A. Company. This aim to decompose the organics and stabilize heavy metal containing contaminated dredged sediment for beneficiai reuse. This process comprises two stages: chemical treatment (addition of soluble phosphate) and the thermal treatment (calcination). Research presented is focused on the thermal treatment. Our objective is to understand the physicochemical behaviour of the sediment during the calcination. The understanding of the evolution on these properties will help for the beneficial reuse of the treated sediment in various industry such as the civil engineering. The characterization performed was followed by the investigation of the behaviour of heavy metals and the organic compounds during the calcination. The distribution of heavy metals between the solid phase and the gas phase were studied during the calcination and the result obtained showed majority of heavy metals are trapped in the solid. The leaching tests performed showed that heavy metals present in the residue are well stabilized. The degradation of the organic compounds is effective at 400°C. Afterwards, the structural change of the sediment during thermal treatment was investigated at laboratory scale and at pilot scale. An increase in specifie surface is observed until 400°C followed by a signification reduction accompanied by a densification and growing of the particles. The increase in specifie surface observed is the formation of pores observed by due to the decomposition of organics from 400°C to l000°C. The combined evolutions of properties are due to the thermal sintering of the sediments induced by the formation of grain boundary driven by the mass transport at high temperature. The calcination in a rotary kiln showed that the physical properties (the specifie surface, density, particle size) of the sediment depend on the calcination. Parameters such as the residence time, calcination temperature, sediment flow rate were investigated
Salmaoui, Samiha. "Elaboration d'oxydes de tungstène nanostructurés, caractérisation et étude de leurs propriétés physico-chimiques". Paris 7, 2014. http://www.theses.fr/2014PA077198.
Hexagonal WO3 nanorods, hexagonal WO3. 1/3H2O nanofibers and orthohombic WO3. 1/3H2O three-dimensional hierarchical architectures have been synthesized by hydrothermal process using structure-directing templates. The structure, the morphology and the composition of the materials have been examined by different physico-chemical techniques. The effects of experimental conditions such as pH, temperature, reaction time and organic templates have been studied. Cyclic voltammetric characterization of thin films of as-prepared nanomaterials has revealed reversible lithium intercalation/deintercalation into the crystal lattice of nanocristalline tungstene oxides. A correlation between structural, morphological and electrochimical properties has been investigated. Moreover, the Hexagonal WO3 nanorods can be applied as active support for the catalytic bi-metallic Pt-Ru nanoparticles during electro-oxidation of ethanol in acid medium
Orliac, Aurélie. "Synthèse et propriétés physico-chimiques des fluoro-pipéridines XtalFluor-E et synthèse d’amides". Paris 6, 2013. http://www.theses.fr/2013PA066503.
The development of new biologically active molecules with few side effects is an important challenge. Among all the existing strategies to modulate the pharmacokinetics properties of molecules, introducing one or more fluorine atoms is often used by medicinal chemists. As the 3-aminopiperidine motif is frequently encountered in biologically active compounds, we have studied the modulation of the physico-chemical properties induced by the introduction of one or two fluorine atoms on 3-aminopiperidine motif. The synthesis of 3-amino-5-fluoropiperidines and 3-amino-5,5-difluoropiperidines was efficiently performed by ring enlargement of prolinols. The study of the pKa and the lipophilicity (log D and log P) of these fluoropiperidines was useful to quantify the effect of fluorine atom on the physico-chemical properties of 3-aminopiperidines. Besides, the synthesis of fluorinated piperidine heterocycles with biological activities, such as quinolizidines, was realized by ring enlargement induced by DAST. Among the widespread synthetic reactions, the formation of amides is an important step. For our part, we have developed the formation of amides from amines and carboxylic acids activated by XtalFluor-E. Various amines (primary and secondary) as well as various carboxylic acids can be coupled thanks to this agent. Particular conditions were also developed in order to favor the amidification between low nucleophilic amines and various carboxylic acids
Heck, Romain. "Synthèse et étude des propriétés physico-chimiques de nouvelles métallo-cyclodextrines". Nancy 1, 2003. http://www.theses.fr/2003NAN10165.
This work deals with two aspects of the study of new Metallocyclodextrins. First of all, the "phosphine-imide" reaction was generalised to the synthesis of a new family of multichromophoric and multicomplexant supramolecular podands : URFT urei͏̈docyclodextrins (URFT = Upper Rim Fully Tethered) and URFT thiourei͏̈docyclodextrins. Moreover, a new fast and reproducible synthesis of symmetrically trifunctionnalised a-cyclodextrin was developed. Second of all, specific physicochemical properties related to selective metal coordination and complexation and to fluorescence properties of URFT urei͏̈docyclodextrins "rare earth" complexes were investigated. The new systems were found to have very selective and original coordination processes towards transition metals cations. "Rare earth" complexes fluorescence emission was found to be highly sensitive towards the presence of transition metals cations and small organic molecules
Capitoli di libri sul tema "Titane – Composés – Propriétés physico-chimiques":
Stebe, Marie-Jose. "Propriétés physico-chimiques des tensioactifs fluorés: comparaison avec les systèmes hydrogénés". In Formulation des composés siliconés et fluorés, 41–55. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0240-1-004.
Stebe, Marie-Jose. "Propriétés physico-chimiques des tensioactifs fluorés: comparaison avec les systèmes hydrogénés". In Formulation des composés siliconés et fluorés, 41–55. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0240-1.c004.