Literatura científica selecionada sobre o tema "Dépôt solide de NaCl"
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Artigos de revistas sobre o assunto "Dépôt solide de NaCl"
Bejaoui, J., S. Bouhlel, D. Barca e A. Braham. "Le champ filonien à Zn-(Pb, Cu, As, Hg) du district minier de Fedj Hassène (Nord Ouest de la Tunisie): Minéralogie, Eléments en traces, Isotopes du Soufre et Inclusions Fluides". Estudios Geológicos 67, n.º 1 (30 de junho de 2011): 5. http://dx.doi.org/10.3989/egeol.40214.118.
Texto completo da fonteLEBEAU, J.-P. "RECHERCHE EN PRECARITE ET PRECARITE DE LA RECHERCHE". EXERCER 32, n.º 177 (1 de novembro de 2021): 387. http://dx.doi.org/10.56746/exercer.2021.177.387.
Texto completo da fonteTeses / dissertações sobre o assunto "Dépôt solide de NaCl"
Curnis, Agathe. "Évolution métallurgique et corrosion à haute température de matériaux à gradient de composition élaborés par procédé Laser Metal Deposition - powder". Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://www.theses.fr/2024UBFCK018.
Texto completo da fonteCompositionally graded materials offer numerous advantages, including the ability to locally adjust the material composition to adapt it to service conditions while minimizing the risks of incompatibilities between materials. This thesis work focused on the development of a compositionally graded material system using the Laser Metal Deposition-powder process, starting from a low-alloy steel substrate to alloy 625. As this multi-material system is expected to exhibit good high-temperature corrosion resistance, its behavior in an air atmosphere at 800°C and 650°C, with and without a NaCl solid deposit, was studied.Characterization of the as-built compositionally gradient system revealed various microstructures and phases depending on the regions of the gradient. Metallurgical evolutions were highlighted during aging at 800°C, particularly in alloy 625 with the precipitation of the δ phase.The oxidation resistance of the system was studied in an air atmosphere at 800°C for up to 2 500 h. Parabolic kinetics related to the formation of a protective Cr2O3 layer were highlighted. The presence of a NaCl deposit catastrophically accelerated the degradation of alloy 625. In this case, the corrosion scale was thick, highly cracked or spalled and mainly composed of NiO, Cr2O3, and (Ni,Cr,Fe)3O4. The metal region at the interface with the oxide layer was severely damaged, especially by the formation of an interconnected voids network allowing the rapid diffusion of chlorinated species in the active oxidation mechanism occurring under these conditions. In comparison, at 650°C, material degradation with a NaCl deposit was significantly slowed, with a thinner corrosion scale, and a less damaged substrate. Differences in behavior between the two temperatures can be understood through differences in microstructural characteristics and the volatility of metal chlorides."
Ammar, Rachid. "Etude des réactions atmosphériques photoinduites à l'interface air/solide : application au dépôt urbain". Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00866315.
Texto completo da fonteAmmar, Rachid. "Etude des réactions atmosphériques photoinduites à l’interface air/solide : application au dépôt urbain". Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10028/document.
Texto completo da fonteThe atmosphere contains a wide variety of solid and liquid particles, named Aerosol. These particles can affect the radiatif balance, air quality in urban environment and can change the composition of the atmosphere. The atmospheric gas phase can react with the vegetation and the buildings containing the urban grime. This work is focused on the investigations of the heterogeneous chemistry between atmospheric gas phase and the urban grime. The aim of the present work is to study the effect of the irradiation on the heterogeneous kinetic of NO2 on pur organic films (pyrene, fluoranthene, phenanthrene) and on organic/inorganic films (pyrene/KNO3, pyrene/Fe2O3, pyrene/KNO3/Fe2O3) as a first attempt to simulate the complexity of the urban grime. A coated flow tube reactor coupled with a NOx analyzer is used to study this kinetic. This work demonstrates the effect of solar radiation on the heterogeneous reaction between gasphase NO2 and the urban grime. The uptake coefficient calculated is a function of the initial NO2 concentration, the relative humidity and the irradiation intensity. We identified after this reaction the formation of nitrous acid and nitric oxide, nitrite ions and 1‐nitropyrene.The nitrous acid is an important compound which dissociates to form the hydroxyl radical and can promote the ozone formation. The results discussed herein suggest that PAHcontaining urban grime on windows and buildings may be a key player in urban air pollution
Berthaud, Maxime. "Étude du comportement de l'alliage de titane Ti6242S à haute température sous atmosphères complexes : applications aéronautiques". Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCK035/document.
Texto completo da fonteThe use of titanium alloys in many applications (transport, energy, chemistry,...) allows significant weight savings in relation to the good mechanical properties/density ratio of these materials. Since titanium alloys are employed at high temperatures (T>500°C), their behavior in such conditions has to be studied in severe conditions in order to understand degradation mechanisms. Moreover, some specific conditions can be met during application, like thermal cycling, water vapour or presence of salts. These parameters are known to influence oxidation behavior of titanium alloys.In this thesis work, oxidation behavior of an aeronautics titanium alloy (Ti6242S) has been studied in air and moist air at 560°C. The effect of solid salt deposits (NaCl and/or Na2SO4) on the oxidation behavior of Ti6242S alloy has also been taken into account. Ti6242S samples were oxidized at 560°C for oxidation times up to 19 000 hours with or without solid salt deposits. NaCl deposit resulted in an important deterioration of Ti6242S alloy behavior at this temperature. Oxygen dissolution in the metal was no longer observed compared to ageing in air, but internal oxidation of the alloy could be evidenced, and cracks were observed deeply into the metallic substrate after oxidation. The corrosion resistance decrease in such conditions was attributed to the presence of chlorine and formation of volatile metallic chlorides due to the presence of NaCl. A degradation mechanism based on active oxidation of Ti6242S alloy exposed to NaCl salt was proposed. The second salt deposit tested consisted in a mixed NaCl/Na2SO4 salt deposit. The harmful effect of this salt deposit on the oxidation behavior of Ti6242S alloy was lower than that of a simple NaCl deposit.Mechanical properties of Ti6242S alloy exposed to solid salt deposits at 560°C were then studied. A simple oxidation in air for 100 hours without salt deposit resulted in an important loss of ductility of the tested samples due to the presence of oxygen solid solution into the metal. The same oxidation time caused an even more important loss of ductility for the samples covered by NaCl deposits. In this case, sample failure occurred at the end of the elastic deformation domain. Elastic modulus and yield strength were also strongly decreased. Mixed NaCl/Na2SO4 deposit exhibited a lower impact on the mechanical properties of the oxidized Ti6242S sample, in accordance with the lower reactivity of Ti6242S alloy with this type of salt deposit. Mechanisms explaining Ti6242S alloy mechanical behavior in such conditions were explained in this thesis work
Mastouri, Wejdene. "Caractérisation croisée de la double couche électrique se développant à l'interface solide/liquide (304L/NaCl) pour différents états de surface". Thesis, Poitiers, 2017. http://www.theses.fr/2017POIT2305/document.
Texto completo da fonteWhen a metal is immersed in an electrolyte, a charge distribution is created at the interface and a potential is set up across the two phases. The separation between charges give rise to what are known as electric double layers (EDL). Compared to the usual solid/liquid interfaces investigated in the literature, this study is dedicated to the EDL at the stainless steel 304L / passive film / NaCl (0.01M) interface by combining electrochemical, electrical and physical methods. First, a methodology has been set up to characterise the EDL by the electrochemical methods: Electrochemical Impedance Spectroscopy (EIS) and cyclic voltammetry (CV). Both the effective capacity and the surface charge density were evaluated. Then, several parameters were investigated such as the electrolyte concentration, the applied potential and the influence on the EDL of the surface preparation. The results showed that the double layer capacitance depends mainly on the concentration of the electrolyte and on the applied potential. The roughness seems to have a poor influence on the measured capacitance. Various physico-chemical analysis were performed in order to characterise the passive films formed at the surface: no significant difference could have been evidence between the surfaces before and after immersion. Finally, the volume charge density was also determined by the liquid flow electrification measurement. Whatever the characterization techniques used (EIS, CV or flow electrification), the same trend was observed with regard to the influence of the concentration on the characteristics of the EDL
Hallot, Maxime. "Micro-batteries tout solide en technologie Li-ion sur substrats Silicium planaires et tridimensionnels pour objets connectés". Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1I115.
Texto completo da fonteMiniaturized sensors for Internet of Things (IoT) application is in expansion since the last 10 years. All solid-state lithium-ion battery is a promising candidate. Nevertheless, in spite of high technological readiness level, planar micro-batteries suffer from a lack of energy density meaning that it is necessary to develop new architectures to fullfill the performances requirements. 3D structures is needed for such application and this work is focused on the synthesis of positives electrodes with high storage capacity and high operating voltage by Atomic layer deposition (ALD). In the frame of this work,we will rely structurals and electrochemicals properties by differents characterisations techniques for batteries materials
Assaf, Bassam. "Etude du dépôt de micro particules par thermophorèse pour un écoulement laminaire entre deux plaques planes parallèles". Nancy 1, 2002. http://www.theses.fr/2002NAN10007.
Texto completo da fonteThis work is an experimental and theoretical contribution to the study of the deposits of microparticles by thermophoresis for a laminar flow between two parallel flat plates. After a theoretical approach of the phenomenon, we study in experiments the deposit of microparticles of sodium chloride generated by pulverization in air circulates between two flat plates separated by 0,005 m. The thermal gradient between the two plates is 26000 K. M-1. The air flow rate is chooses so that the flow is laminar. We propose three models (two analytical models and a numerical model) to estimate the thermophoretic efficiency of the particles deposit. With our operating conditions, the experimental efficiency is low, the values are compatible with the values estimated by the numerical model which represents better the thermohydraulics of the gas phase in the deposit zone
Dhalluin, Florian. "Nanofils de Silicium : Dépôt chimique en phase vapeur assisté par catalyseurs métalliques et prémices d'intégration". Phd thesis, Grenoble 1, 2009. http://www.theses.fr/2009GRE10066.
Texto completo da fonteMicroelectronics has its back to the wall. One of the possible ways to pursue its development is the “bottomup” approach, whose philosophy can be enounced as follows : “grow the device you want where you want”. The unidimensionnal structures, and more precisely the semiconductor nanowires, belong to this topic. In the present manuscript, we study the growth of silicon nanowires by metallic particles assisted chemical vapor deposition. First of all, we study the growth of silicon nanowires with gold as catalyst and silane as precursor gas, via the vapor-liquid-solid growth mechanism (VLS). We are more particularly interested in the impact of the growth parameters (reactant gas partial pressure, temperature, deposition time, catalyst size) on the nanowires morphology and their growth kinetics. The addition of HCl to the reactant mixture is investigated. In a second time, we focus on the growth of branched nanostructures. First, an experimental approach coupled with a thermodynamic one, has enabled us to determine the necessary condition to the growth of the nanobranches (and nanowires) of small diameters (i. E. < 10 nm), by VLS. Then we present the growth of these branched structures obtained at temperature going down to 100 °C below the macroscopic eutectic of the Au-Si system. Since gold is an undesirable material for many microelectronics applications, due to the fact it induces deep level traps in silicon, we have investigated the growth of Si NWs using CMOS compatible catalysts: metallic silicide particles (platinum, nickel and palladium silicides). In this case, the Si NWs grow via the vapor-solid-solid growth mechanism. Finally, we give some examples of technological integration, with the growth of localized Si NWs fields, and the realization of Si NWs based MOSFET-like devices, which have been electrically caracterized
Dhalluin, Florian. "Nanofils de Silicium : Dépôt chimique en phase vapeur assisté par catalyseurs métalliques et prémices d'intégration". Phd thesis, Université Joseph Fourier (Grenoble), 2009. http://tel.archives-ouvertes.fr/tel-00495316.
Texto completo da fonteQuertite, Khalid. "Silicene growth on insulating ultra-thin film of NaCl". Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS467.
Texto completo da fonteSilicene, the silicon-based analog of graphene which has a two-dimensional (2D) structure. It is expected to have attractive electronic properties such as massless Dirac fermions and high electron mobility. The existence of silicene has been shown recently on noble metal substrates such as Ag and Au. The results present strong interactions between the silicene adlayer and the metallic substrate which destroy the intrinsic electronic properties of silicene. In order to solve this problem, we propose in this work to explore other potential substrates that have weaker interactions with silicene. We studied the growth of a 2D silicon layer on insulating NaCl thin film. Indeed, Alkali metal halides such as NaCl offer a great solution as an alternative surface because they behave as a dielectric layer, allowing characterization of silicene material. We studied the structural and electronic properties of 2D silicon layer grown on a NaCl film deposited over Ag(110) substrate. A combined experimental investigation was performed with a large number of techniques which are used in surface science such as: low energy electron diffraction (LEED), auger electron spectroscopy (AES), scanning tunneling microscopy and spectroscopy (STM/STS), extended x-ray absorption fine structure (EXAFS), x-ray photoelectron spectroscopy (XPS) and angle resolved photoemission spectroscopy (ARPES). The adsorption of silicon atoms on NaCl films reveals the existence of a 2D silicon sheet adlayer with a highly ordered honeycomb-like structure. The silicon ad-layer has weak interactions with the substrate and it mimics the structure of silicene. Finally, preliminary experiments on the growth of silicene on dissociated NaCl films are presented. The effect of electron irradiation on the NaCl film and initial ARPES measurement on the silicone intercalated-Na atoms system are presented