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Artykuły w czasopismach na temat "Métaux – Propriétés physico-chimiques"
Ennaciri, Yassine, Mohammed Bettach, Ayoub Cherrat, Ilham Zdah i Hanan El Alaoui-Belghiti. "Synthèse bibliographique : étude des propriétés physico-chimiques du phosphogypse Marocain". Matériaux & Techniques 108, nr 2 (2020): 207. http://dx.doi.org/10.1051/mattech/2020029.
Pełny tekst źródłaNfissi, Samiha, Saida Alikouss, Youssef Zerhouni, Zouhir Baroudi i Mohamed Samir. "Alkaline amendment based of sludge pulp of sweets and clays: application to the tailings of the abandoned kettara mine (Morocco)". Annales de la Société Géologique du Nord, nr 25 (1.12.2018): 75–81. http://dx.doi.org/10.54563/asgn.637.
Pełny tekst źródłaRozprawy doktorskie na temat "Métaux – Propriétés physico-chimiques"
Heck, Romain. "Synthèse et étude des propriétés physico-chimiques de nouvelles métallo-cyclodextrines". Nancy 1, 2003. http://www.theses.fr/2003NAN10165.
Pełny tekst źródłaThis 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
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.
Pełny tekst źródłaThe 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
Pitchon, Véronique. "Influence des alcalins sur les propriétés physicochimiques et catalytiques du palladium supporté sur silice". Lyon 1, 1989. http://www.theses.fr/1989LYO10057.
Pełny tekst źródłaVeys, Delphine. "Évolution des propriétés physico-chimiques de surface des matériaux quasicristallins lors de sollicitations électrochimiques". Vandoeuvre-les-Nancy, INPL, 2004. http://www.theses.fr/2004INPL076N.
Pełny tekst źródłaThe main goal of this study is to understand how the surface properties of quasicrystalline and approximant alloys are modified when submitted to various kinds of electrochemical stress. The alloys are Al-based complex intermetallic phases of the AI-(Cu)-Fe-Cr system, submitted to either corrosion test in aggressive media or simply to oxidation and ageing in ambient conditions. Ln a first part, bulk alloys of the AI-(Cu)-Fe-Cr system were synthesized and their atomic structure was characterised. Then, the corrosion behaviour of these alloys was investigated with a view to identify the role of the chemical composition and of the crystallographic structure on their ability to resist corrosion attack in a medium containing citric acid and chloride anions. This work bas allowed us to âetermine the corrosion mechanisms and to identify some alloy compositions which demonstrate high-resistance against corrosion. The last part focusses on the evolution of surface structure and chemistry as a function of electrochemical stress. The topography, composition and structure of corroded samples were analysed. Ln addition, for AICrFe samples, we have highlighted an ageing phenomenon of the surfaces in ambient conditions. We have proposed a model describing the surface of these materials as a stacking of several layers with different chemistry. The surface ageing is modelled and related to the observed modifications of the chemical reactivity
Bouzziri, Miloudi. "Adhérence et propriétés physico-chimiques des couches de phosphate sur aciers et aciers revêtus de zinc". Lyon 1, 1994. http://www.theses.fr/1994LYO10201.
Pełny tekst źródłaKamgang, Noubissi Jean Omer. "Modification des propriétés physico-chimiques et décontamination des surfaces de matériaux par plasma d'arc glissant d'air humide". Rouen, 2005. http://www.theses.fr/2005ROUES030.
Pełny tekst źródłaIn food industries and hospitals, hygienic problems often results from biofilm formation. These sessile microbial are known to be particularly resistant to antimicrobial compounds. To limit the impact of such unwanted structures, it is possible to prevent bacterial adhesion, or, thereafter, to kill adherent cell. Plasma involve the productions of highly reactive species and can be efficient in both strategies. In that context, we've designed a new operating technique exploiting the properties of humid air produced by gliding arc at atmospheric pressure. Experimentally, a 2. 5 minutes treatment of testing materials induces an increase of their surface hydrophily. By modifying their properties, the “glidarc” treatment also modified the adhesion behavior of Staphilococcus epidermidis. This adhesion increases whatever the material employed. Also, “glidarc” treatment of sessile microbial induces a total destruction of 106 UFC. Cm-2 of attached cells and 107 UFC. Cm-2 of biofilm
Adam, Laure. "Synthèse, caractérisations structurales et physico-chimiques de nouveaux phosphates d'éléments de transition". Caen, 2009. http://www.theses.fr/2009CAEN2057.
Pełny tekst źródłaThis thesis deals with the study of transition element phosphates, whose mixed frameworks contain cavities able to host cations. The great structural wealth in this family of compounds opens the way to numerous properties. We have chosen to study A-M-P-O(-H) systems in which A is a monovalent cation and M is a transition element (mixed-valent if possible) or post transition element, in order to obtain new materials for catalytic applications. In this context, the study of the A-M-P-O(-H) systems, with A = NH4, Li, Na, K, Rb, Cs and M = Fe, Mn and In has been undertaken. The other aim of this work was a better understanding of the influence of synthesis experimental conditions on the nature of the obtained phases. In spite of the difficulty to synthesize new materials in the considered systems, eleven new phases have been isolated and three of them exhibit original framework. Structural determinations have been performed by single crystal X-ray diffraction combined with powder X-ray diffraction and EDX analysis. The study of catalytic properties for DeNOx reaction via the NH3-SCR have been carried out by “in situ” and “operando” spectroscopy and mass spectroscopy for one iron phosphate. Magnetic properties of four compounds, which are reported in this manuscript, are discussed
Sagou, Sagou Jean-Pierre. "Influence de cations métalliques sur les propriétés physico-chimiques de carboxyméthyl-dextrane fonctionnalisé". Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL072N/document.
Pełny tekst źródłaThe present work focused on the acquisition of experimental and quantitative data on the physico-chemical properties of a linear, flexible and chemically functionalized polysaccharide by carboxymethyl grafting, yielding carboxymethyldextran macromolecules (CMD) and an aqueous electrolyte containing various ions Na+, Ca2+ et Cd2+ with different chemical affinity for these chemical functions. Charge density and complexation – dissociation constants have been evaluated using specific electrodes-based potentiometric titration. The electro-hydrodynamic properties and the conformational transitions were examined through electrical conductivity increment measurements, electrophoresis, dynamic light scattering and viscosimetry. Also, colloidal stability has been investigated by means of turbidimetry and dynamic light scattering. In the presence of monovalent ions, the behaviour of CMD, typically that of a soft microgel particle, is strongly depending on ionic strength and polysaccharide content. For low ionic strengths and in dilute regime, CMD is in situation of good solvent while in concentrated regime, overlapping double layers that develop around macromolecules governs the electro-hydrodynamic features of CMD. For sufficiently high ionic strengths, intermolecular and intramolecular electrostatic interactions are nearly suppressed, and CMD behaves as a polymer in bad solvent upon increase of its concentration in the medium. In the presence of divalent ions, calcium ions and cadmium ions are in competition with hydronium ions to occupy the carboxylic sites, and this situation is concomitantly accompanied by local reorganization of polymer chains. The large size of formed clusters, the high initial aggregation rate and the increased turbidity all suggest that aggregates are generated according to a diffusion limited aggregation (DLA) type of mechanism
Diab, Walaa. "Étude des propriétés physico-chimiques et colloïdales du bassin de la rivière Litani, Liban". Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0063/document.
Pełny tekst źródłaThis thesis is part of one of the focus of research at “MCEMA Laboratory” that concerns the physicochemical study of river water and the evaluation of the possible influence of human activities on the water quality of the Litani River. This work is divided into three principal parts. In the first one, we studied the physicochemical parameters (T, pH, EC, TSS, TDS, ions, etc.) of the water. The second part focuses on the sediment analysis. We studied the sediments of Litani River, their nature, size, composition, physicochemical properties (charge and specific surface area) with the metallic contamination. The third par is devoted the adsorption study of certain pollutants present in water on activated coal in order to anticipate on a future study on the treatment of the water river. The obtained results fall within a broader project on the study of developed methods on the treatment of wastewater
Bouchaala, Nader. "Etude des propriétés structurale et physico-chimique des systèmes Nd-Fe-Co". Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1043/document.
Pełny tekst źródłaIntermetallics based on Rare Earths (R) and Metalloids (M) are of interest in the field of fundamental research to understand the nature of magnetic interactions in the complex case where the localized magnetism of the R elements combines with That of the much less localized transition elements. Moreover, exceptional magnet properties make it possible to use them for technological purposes in the field of permanent magnets or magnetic recording. The magnetism group of the CMTR (ICMPE) UMR7182 CNRS-UPEC (France) specializes in the study of the magnetic properties of intermetallics and the correlation of these properties with structural and microstructural properties. The team of intermetallics, of the Laboratory of Materials and Environment Sciences "MESLab" of the University of Sfax (Tunisia), has acquired a great experience in the determination of the diagrams of binary or ternary phases from the study Of the physico-chemical properties of the synthesized compounds. My research project in these two laboratories will involve studying the structural and physicochemical properties of the R-Fe-M systems (R = rare earth, M = transition metal or metalloids) according to the following steps: 1- Establish a ternary diagram between the R-Fe-M elements. 2- Seek new solid solutions. 3- Structural study of the different phases synthesized by different experimental techniques (RX, MEB, X-ray spectroscopy, ...). 4. Study of the magnetic properties of the different phases. 5- Interpretation of the relationships with the nature of the basic elements used