Дисертації з теми "Interface Chimie"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 дисертацій для дослідження на тему "Interface Chimie".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Martin, Sébastien. "Mécanismes de sorption et d'oxydoréduction à l'interface oxyde/solution : couplage chimie / transport." Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S157.
Повний текст джерелаGiven the ubiquity of iron oxides in environmental settings, particularly goethite and hematite, the most stable forms, but also the proliferation of emerging contaminants, such as fluoroquinolones, in the environment, our goal was to study their reactivity and describe mechanisms of sorption and redox at oxide /solution interfaces in static batch) and hydrodynamic conditions (column) by coupling a macroscopic study (LC/MS, LC/UV) with a microscopic/molecular approach (vibrational spectroscopy and XPS) and mechanistic modeling (TPM and CD-MUSIC).. These works highlight the main mechanisms responsible of the transformation of organic molecules on iron oxide surfaces and thus provide valuable information necessary for the understanding of the fate of emerging contaminants in the environment
Lesueur, Cécile. "Contribution à l'étude de la propagation des ultrasons à une interface liquide-solide composite." Aix-Marseille 3, 2004. http://www.theses.fr/2004AIX30014.
Повний текст джерелаTThe influence of unfilled cavities at a liquid-solid interface (composite interface) on the propagation of ultrasounds has been investigated. The case of compression waves in normal incidence is considered. A composite interface between liquid lead and modelled rough silicon substrates has been characterised by wetting experiments using the liquid bridge method. A bibliographic study allows to build a simplified model of ultrasonic waves transmission when the composite interface is considered as defects array in the same plane. Wave propagation through a crenel array of steel samples has been calculated using a finite element code. Experiments validate the results obtained with the simplified model by simulation for a non composite interface. When the interface is composite, the wave transmission drops dramatically. The growth and coalescence of vapour phase contained in the unfilled cavities is suggested to be the origin of the drop
Timounay, Yousra. "Rhéologie d'interface liquide/air chargées de grains : vers la consolidation d'un milieu aéré." Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC1156/document.
Повний текст джерелаLiquid foams are in a metastable state. One way to stabilize them is incorporating solid particles. When hydrophobic, these particles attach to liquid-air interfaces of the particle-laden foam inducing a drastic change in the rheology of the films between bubbles. The aim of this thesis is to study experimentally two elementary components of particle-laden foams, namely soap films and bubbles. The rheology of particulate films is probed through bursting and compression experiments while the resistance of armored bubbles is studied by inner pressure variations. Using high speed photography, we first show that particles bridging both liquid-air interfaces of a liquid film can resist hole opening and that the retraction dynamics for the other configurations can be described by a balance between inertia and capillarity for surface fractions of particles <0.6 approximately. Then studying the retraction dynamics of particulate soap films by Particle Image Velocimetry, we characterized these systems by an effective viscosity that diverges at the jamming transition. Moreover, buckling is observed at high surface fraction of particles indicating a transition from liquid-like to solid-like behavior. Concerning particulate bubbles, we showed the existence of pressure thresholds 10 times greater than Laplace pressure that need to be exceeded in order to observe a deformation in depression and overpressure experiments; the effective tension in the granular shell is thus 10 times greater that the tension in a liquid film. When inflated, a fracture corresponding to the stretching of the liquid film appears on particulate bubbles. Through an elastic approach, Griffith’s criterion gives the right order of magnitude of fracture pressures
Benharbit, Morchadi Meriem. "Interface pierre-mortier. Mécanismes de transfert et d'altération. Procédé de passivation." Montpellier 2, 1994. http://www.theses.fr/1994MON20260.
Повний текст джерелаCelia, Elena. "Study and modification of interface polyethylene-waterborne pressure sensitive adhesive." Nice, 2011. http://www.theses.fr/2011NICE4106.
Повний текст джерелаThe aim of this work was to study of the interface between waterborne pressure sensitive adhesives (PSAs) and polyethylene (PE) in order to understand and improve the adhesion between them. Firstly, we have pointed out that plasma and corona treatments increase wettability and surface energy of polyethylene but are not permanent. Then, we have realized a covalent grafting of acrylic acid inducing a permanent modification of the polyethylene surface. Both plasma treated and acrylic acid grafted surfaces exhibit greater adhesion performance toward PSAs than untreated polyethylene. The study of Zeta potential curves of PSA films and polyethylene seems to show some influence of electrostatic interactions in the adhesion phenomena. Finally, we have modified the polyethylene surface by the covalent grafting of silica nanoparticles. The assembling of silica particles on the surface changes the surface roughness and consequently its wettability and adhesion properties. The surface was afterwards rendered hydrophobic by modification of particles with a semifluorinated compound. This pathway may offer new perspectives in the fabrication of high reactive materials such as catalysts and antimicrobial surfaces
Fradet, Guillaume. "Physico-chimie de l’interface fibres/matrice : applications aux composites Carbone/Carbone." Thesis, Bordeaux 1, 2013. http://www.theses.fr/2013BOR14948/document.
Повний текст джерелаThis work focuses on the physical chemistry of the fiber/matrix interface applied to composites carbon/carbon. The surface of carbon fibers was modified by various surface treatments. The carbon fibers surface variation was evaluated by inverse gas chromatography at infinite dilution, SEM, AFM, TEM, Raman... After these characterizations, surface treatments were selected for the realization of C/C composites. The mechanical properties of composites at modulated interfaces (fibers/matrix bonding) were evaluated. Finally, a correlation between surface modification of carbon fibers and macroscopic behavior of composite C/C was established
Herbi, Boussad. "Détermination d'interfaces fluide-fluide à partir d'une conjecture sur la notion de mouillabilité avec hystérésis." Vandoeuvre-les-Nancy, INPL, 1991. http://www.theses.fr/1991INPL039N.
Повний текст джерелаCe travail a pour objet de vérifier l'adéquation mathématique de nouveaux paramètres susceptibles de caractériser la notion de mouillabilité avec ou sans hystérésis ; on s'intéresse en fait à la détermination d'interfaces fluide-fluide à partir de la connaissance des nouveaux paramètres. Les approches classiques, tant locales qu'énergétiques, s'appuient sur les données à priori de l'angle de contact ou de la différence des deux tensions interraciales fluides-solide (traduisant les interactions respectives du solide avec les deux fluides en présence). Dans ce travail, à propos du modèle simple d'équilibre d'une goutte symétrique posée, nous examinons de près les approches énergétiques classiques ; nous en précisons les liens avec l'approche locale ainsi que leurs limites communes ; nous montrons enfin que, pour déterminer l'interface goutte-environnement, on peut se passer des données non réalistes mentionnées ci-dessus (angle de contact tensions inter faciales fluides-solide) en s'appuyant sur la conjecture de Benyettou-Lanchon (thèse 3eme cycle INPL 1985 et mesures expérimentales ultérieures)
The purpose of this work is to check the mathematical adaquation of some intrinsic parameters able to characterize the notion of wettability, with or without hysteresis. In fact, we are interested in the possibility to determine any “fluid-fluid” interfaces from the knowledge of these intrinsic parameters. The classical approachs, local or energetical ones, are based under the “a priori”data of, either the contact angle, on the difference between the interfacial tensions “solid-fluids”, these last ones are supposed to characterize the mutual interactions of the solid with the two fluids. In this wordk, we consider the simple situation of a symmetric drop for which we look carefully the energetical approach ; we compare it to the local one, and point out their common limits. We show also, how to compute the “drop surroundings” interface, without knowing a priori the unrealist date mentioned above (contact angle or interfacial tension between solid and fluids) ; this computation leans on the “Benyettou-Lanchon” conjecture
Guenoun, Patrick. "Instabilite des melanges de fluides : influence des forces de pesanteur et de mouillage." Paris 6, 1987. http://www.theses.fr/1987PA066127.
Повний текст джерелаGakis, Giorgos. "Modélisation multi-échelles et analyse expérimentale de l'ALD d'alumine : interactions entre dynamique du procédé, chimie de surface et phénomènes interfaciaux." Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0097.
Повний текст джерелаThe constant shrinking of microelectronic devices requires the production of conformal and uniform nanometric thin films, with a high chemical purity and abrupt interfaces. In this context, Atomic Layer Deposition (ALD) has emerged as a favorable process to produce such films. Drawing its advantages from the self-limiting nature of the surface reactions involved, ALD can yield thickness control down to the monolayer, producing conformal films of high purity. Although ALD has many advantages, drawbacks arise when depositing films of some nanometers. In particular, the initial island growth and the formation of an interfacial oxide layer are two of its main limitations, especially for the case of metal oxide ALD on Si. Moreover, the deposition on large area wafers is not always uniform, and depends on the reactor and process design. These drawbacks need to be suppressed in order to establish ALD as the adequate process for the deposition of high-k gate oxides on Si, essential for the production of field effect transistors of the future. In this thesis, the ALD of Al2O3 from TMA and H2O on Si is thoroughly investigated, in order to tackle the above drawbacks. The investigation consists of a combined multiscale computational and experimental approach. Four different numerical models were developed dealing with different space scales. A complete set of characterization techniques was used, including ellipsometry, XRR, TEM, STEM, EDX, XPS and SIMS. Using this framework, the detailed phenomena involved are illuminated, thus allowing to better understand the process and identify the factors responsible for the drawbacks of ALD. The competition between surface mechanisms, namely desorption and surface reactions, was found to be the limiting factor for deposition at low temperatures, up to 200oC. The concentration of surface reactive sites was found to limit the deposition at higher temperatures up to 300oC. Although ALD is conceived as a process depending only on surface chemistry, the analysis of the transport phenomena inside the ALD chamber showed that the reactor and process design can affect the reactant and temperature distribution inside the ALD reactor. The multiscale approach and the coupling among the different computational models revealed that the interplay between surface mechanisms and transport phenomena affects the film uniformity. Using this computational approach, it was possible to derive optimal process conditions that ensure maximum film uniformity. During the first deposition steps, the film deposition was found to be inhibited, leading to an island growth regime. The integrated analysis showed that 25 cycles are needed in order to deposit a continuous Al2O3 film. During this regime, interfacial oxidation of the Si substrate led to the formation of a ~2 nm interfacial oxide layer, consisting of SiOx, AlOx, and Al-silicates, which degrades the properties and thus the potential applications of the deposited structure. An in situ N2-NH3 plasma pretreatment of the HF-cleaned Si substrate was introduced, leading to a formation of a SixNyH layer on the substrate surface. The pretreatment was found to enhance the surface reactivity, as the inhibition period was restricted and linear ALD growth was obtained even after 5 cycles. Furthermore, interfacial Si oxidation was reduced, as the SixNyH layer was found to serve as an effective barrier for O diffusion and Si oxidation. The work presented in this thesis demonstrates the necessity of such integrated approaches to analyze the detailed phenomena involved in ALD. Such studies help in the thorough understanding of the ALD mechanisms, and consequently in elaborating solutions which restrict the drawbacks arising during the initial deposition steps. This could pave the way for the ALD process to industrially produce uniform and conformal nanometric thin films of high purity and abrupt interfaces, able to answer to the demands of the future electronic industry
Jacquot, Francis. "Contributions expérimentale et théorique à une nouvelle approche de la mouillabilité." Vandoeuvre-les-Nancy, INPL, 1998. http://www.theses.fr/1998INPL056N.
Повний текст джерелаCourleux, Alice. "Physico-chimie des échanges matrice/renfort dans un matériau composite acier/TiC." Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00642978.
Повний текст джерелаChaumont, Alain. "Microscopic insights into the solvation of hydrophilic and hydrophobic ions in ionic liquids and on the nature of the IL/water interface : A computational study." Université Louis Pasteur (Strasbourg) (1971-2008), 2005. http://www.theses.fr/2005STR13171.
Повний текст джерелаEl, Itawi Hassan. "Crossing of a liquid-liquid interface by a droplet under centrifugal effect for a micro-encapsulation process." Thesis, Toulouse, INPT, 2020. http://www.theses.fr/2020INPT0039.
Повний текст джерелаThe applications concerned by microencapsulation are constantly growing and cover sectors of industrial activities as varied as agriculture, pharmacy, food industry and even cosmetics. This work is a part of the development of a microencapsulation process based on sub-millimeter-sized drops crossing a liquid-liquid (L-L) interface under the influence of an external force, in this case centrifugal force. The objective of this work is to understand the hydrodynamics and interface mechanisms before, during and after the passage of a drop through a L-L interface, and leading to its coating. For this purpose, numerical and experimental approaches have been combined and complemented by theoretical models. A numerical method solves the Navier-Stokes equations for this three-phase flow by a finite volume discretization combined with the Level-Set and ghost-fluid methods to capture the interface dynamics and to deal with the discontinuities at the interfaces; it allows to compute the velocity field around the deformable droplets during the interface crossing. An experimental device for forming aqueous drops of sizes (100-1400 μm) and forcing their passage through a L-L interface using a centrifugal force of magnitude up to ≈ 2500g was designed to observe all stages of the process by a high-speed camera synchronized with the rotation of the encapsulation cell, and to analyze the crossing conditions and the different fluid entrainment regimes. The crossing or the rebound of a droplet at the interface is a result of the competition between interfacial forces, the weight of the drop and its inertial force, and is due to complex phenomena involving non-dimensional numbers. The two approaches made it possible to define the crossing conditions as a function of the relevant non-dimensional numbers: ξ12ξ13 and Bo13, and to develop a scaling law of the maximum length of the column formed during crossing, and the resulting drop coating volume. This work has thus made it possible to determine the optimal conditions, on the scale of a single drop, to encapsulate a liquid droplet by using this process, a necessary step prior to the design of an industrial pilot operating at a continuous production rate
Sahar, Abdallah. "Etude par analyse spectrale de processus aux electrodes fortement aleatoires." Paris 6, 1988. http://www.theses.fr/1988PA066522.
Повний текст джерелаFilhol, Jean-Sébastien. "Solides et interfaces : des outils de modélisation et d'analyse de la complexité en matière condensée." Habilitation à diriger des recherches, Université Montpellier II - Sciences et Techniques du Languedoc, 2010. http://tel.archives-ouvertes.fr/tel-01054331.
Повний текст джерелаPétrélis, Nicolas. "Localisation d'un polymère en interaction avec une interface." Phd thesis, Université de Rouen, 2006. http://tel.archives-ouvertes.fr/tel-00068229.
Повний текст джерелаsolvants (huile-eau). Ces modèles
donnent tous lieu à une transition entre une phase localisée et une phase délocalisée. Nous prouvons tout d'abord
plusieurs résultats de convergence de modèles discrets vers leurs modèles continus associés. Ces convergences
ont lieu dans le cas d'un couplage faible (haute température) et concernent l'énergie libre d'une part, et la pente
de la courbe critique à l'origine d'autre part. Pour cela, nous développons une méthode de
coarse graining
introduite par Bolthausen et den Hollander que nous généralisons au cas d'un copolymère soumis à un potentiel
d'accrochage aléatoire le long de l'interface huile-eau.
Nous prouvons ensuite un résultat trajectoriel, dans le cas d'un
copolymère soumis, en l'une de ses extrémités, à une force qui le tire loin de l'interface.
Nous montrons, en particulier
qu'à l'intérieur de la phase localisée, le polymère ne touche l'interface qu'un nombre fini de fois.
Enfin, nous étudions le cas d'un homopolymère hydrophobe au voisinage d'une interface (huile-eau) et
soumis également
a un potentiel aléatoire lorsqu'il touche cette interface. Par une méthode consistant à adapter la loi de
chacune des
excusions en dehors de l'interface à son environnement aléatoire local, nous prenons en compte le fait que le polymère
peut viser les sites
où il vient toucher l'interface. Ceci permet d'améliorer de façon quantitative la borne inférieure de la courbe
critique du modèle quenched donnée jusqu'alors par la courbe critique du modèle à potentiel constant.
Leblanc, Yannick. "Etude des mecanismes de la coalescence partielle d'une goutte a une interface liquide-liquide." Paris 7, 1993. http://www.theses.fr/1993PA077176.
Повний текст джерелаYao, N'guessan Alfred. "Contribution a l'etude des jonctions gaas-electrolyte aqueux et non aqueux : formation de l'interface et cinetique de transfert de charges." Paris 7, 1987. http://www.theses.fr/1987PA077174.
Повний текст джерелаJia, Juanjuan. "Self assembly of dithiol molecules and adsorption of chalcogen atoms on metals." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112149.
Повний текст джерелаIn this thesis, the characteristics of SAMs of dithiol molecules adsorption on metals are investigated mainly by HRXPS based on synchrotron radiation, TOF-DRS and LEED. The aim is to characterize self-assembled dithiol monolayers formed by evaporative assembly, to understand the transition of dithiols from a lying down phase to standing up phase, and eventually existence of rearrangement and dissociation processes. We found that on Au(111) a lying down phase of butanedithiol (C4DT) could be substituted by octanethiols to form a mixed standing up phase, and also that standing-up C4DT phase could be formed upon rapid very large exposure to C4DT vapors. This shows that the lying down phase should not impede formation of the standing up one. The adsorption of 1,4-benzenedimethanethiol (BDMT) on Au(111), Ag(111), Au(110), Cu(111), Cu(100) and Pd(111) were investigated in this thesis. The standing up phase could be formed in some cases, when the surface is not very reactive. In case of Cu and Pd dissociation of BDMT was observed and surface sulphide was formed on Pd. Also the interaction between chalcogen atoms (S and Se) and some metals was investigated in relation to the self assembly work. The detailed information about their adsorption characteristics should help in resolving ambiguities in characterization of thiol and sulphide assemblies. The result of Se atoms adsorption on Au surface shows chemisorbed Se and Se₈ features, while for Ag the silver selenide is formed. S atoms adsorption on Cu(111), Cu(100) and Pd(111) surfaces result in metal sulfidation and some interesting structures were observed
Basly, Jean-Philippe. "Caracterisation de inp par des methodes electrochimiques : spectroscopie d'impedance et methodes potentiostatiques." Caen, 1988. http://www.theses.fr/1988CAEN2002.
Повний текст джерелаBouchereau, Stéphane. "Modélisation et simulation numérique de l'électro-mouillage." Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10064.
Повний текст джерелаMarie, Camille. "Influence des paramètres physiques sur l'auto-assemblage bidimensionnel d'une série d'hexa-péri-hexabenzocoronènes par STM à l'interface liquide-solide." Phd thesis, Paris 6, 2009. http://www.theses.fr/2009PA066507.
Повний текст джерелаValantin, Chloé. "Compréhension des mécanismes d'endommagement de l'interface textile-caoutchouc." Thesis, Tours, 2014. http://www.theses.fr/2014TOUR4027.
Повний текст джерелаStudied belts undergo complex mechanical stress and thermal variations up to 160°C. To enhance their service life, the interfacial properties between the PA 4, 6 cord, coated with RFL, and the EPDM matrix must be improved. In this study, fatigue tests on belts were stopped after various numbers of cycles in order to characterize the interface between cord and rubber. Electron Microscopy revealed three different mechanisms for mechanical damage: Degradation of the inner cord structure Propagation of fibrillar microcracks at the RFL/rubber interface Appearance of RFL/polyamide microfiber debondings This damage was associated with interfacial hardenings (nanoindentation), viscoelastic properties variations of the structure (DMA) and a decrease in adhesive values (peeling or pulling out). Physicochemical analyses, mainly by Tof-SIMS, enabled to determine interfacial composition and to link its evolution with observed mechanical damage
Landry, Karine. "Contribution à l'étude du mouillage réactif : étude du système aluminium/carbone." Grenoble INPG, 1995. http://www.theses.fr/1995INPG0043.
Повний текст джерелаMessaykeh, Maya. "A fundamental approach of the wetting at Zn/Al2O3 interface : the effect of a Cr buffer." Electronic Thesis or Diss., Sorbonne université, 2018. http://www.theses.fr/2018SORUS478.
Повний текст джерелаHot-dip galvanization is a common process used to protect steel from corrosion. The requirement of reduction of greenhouse gases by car industry led to an interest in the lighter Advanced High Strength Steels. However, their drawback is the segregation of alloying elements (Al) at surface, during the recrystallization annealing, and the formation of oxides (Al2O3) that imped the adhesion of the Zn protective coating. In this context, this study aims at understanding the impact of a Cr buffer on the adhesion of Zn, through a surface science approach using X-ray Photoemission Spectroscopy (XPS), Surface Differential Reflectivity Spectroscopy (SDRS), Low-Energy Electron Diffraction (LEED), Reflection High-Energy Electron Diffraction (RHEED), Extended X-ray Absorption Fine Structure (EXAFS), Atomic Force Microscopy (AFM), Thermal Programmed Desorption (TPD), in addition to ab initio calculations to tackle questions of interfacial chemistry, growth, wetting, structure, and thermal stability of Cr/Al2O3 and Zn/Cr/Al2O3 systems. At the first interface, XPS results suggested the oxidation of Cr at contact with the bare surface of alumina through a reaction with residual OH- groups, further confirmed by EXAFS supported by ab initio calculations. Furthermore, AFM and SDRS proved a Volmer-Weber growth mode of high aspect ratio metallic Cr particles, while RHEED showed non epitaxial growth. At Zn/Cr/Al2O3 interface, an enhancement of Zn sticking coefficient as a function of Cr thickness was proved. Besides, a close relationship between the wetting of Cr and Zn was pointed out by SDRS and strong Cr-Zn bonds, with a likely alloy formation, were put forward by TPD
Paumel, Kevin. "Contribution à l'étude de la transmission des ultrasons à une interface solide - gaz - liquide : application au contrôle non destructif des réacteurs de quatrième génération refroidis par du sodium liquide." Aix-Marseille 2, 2008. http://theses.univ-amu.fr.lama.univ-amu.fr/2008AIX22054.pdf.
Повний текст джерелаUnder the ultrasonic inspection of the fourth generation of sodium cooled reactors, the goal is to study the conditions for the appearance of a very bad acoustic coupling of the transducer with liquid sodium. Under certain conditions, the non wetting of the surface of the transducer by sodium causes trapping gas pockets in the roughness. A first quasi-static analysis based on the crevice model allows to study the dependence of the stability of these gas pockets on the temperature, the hydrostatic pressure, and the level of dissolved gas saturation of the liquid. In order to develop a parametric study based on the size and gas surface fraction, several samples are made. An ultrasonic experiment using various frequencies can measure the transmission through these samples. Meanwhile, three different models describing the experimental setup are proposed, the latter being based on a description of the dynamic behaviour of a simple gas pocket geometry. The comparison of experimental and analytical results (of the last model) show a similar pattern of the dependence of the transmission on the various parameters
Tong, Yongfeng. "Self-Assembly of Organic Molecules on Reactive Metal Substrates." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS522/document.
Повний текст джерелаIn this thesis, the formation of self-assembled monolayers of different chalcogenide molecules and planer π-conjugated molecules and their electronic and structural characteristics were systematically studied mainly by synchrotron based X-ray photoelectron spectroscopy, scanning tunneling microscopy and low energy electron diffraction. A study of formation of hybrid organic-inorganic self assembled structure was performed by layer by layer assembly of a dithiol on ZnO(0001) with intermediate metal deposition. Additionally as a complement to the study of chalcogen head group molecules the adsorption characteristics of selenium and sulfur were investigated. The high resolution XPS and near edge absorption fine structure spectroscopy allowed to investigate the characteristics of self-assembled monolayers of benzene selenide and selenophene on Cu (100), and dihexyldiselenide on Ni(111) and Pd(111) and showed in particular the existence of Se-C bond breaking processes and existence of different adsorption sites of molecules. These conclusions were supported by the study of atomic selenium adsorption, which also shows existence different adsorption sites for the atomic Se with different chemical environments. These conclusions are mainly based on high resolution XPS study of characteristic Se3d, Se3p spectra, valance band spectrum and LEED imaging. The formation of a 5,5- bis (mercaptomethyl)-2,20- bipyridine (BPD) with SH termination on ZnO(0001) was demonstrated allowing subsequent grafting of Ag and Ni and further assembly of BPD on this metal-dithiol layer. The changes in electronic properties were determined from valence band spectra. The large π-conjugated molecule, NTCDA, was deposited on different metal surfaces and its structure morphology and chemical properties with respect to the metal surface was investigated. The NTCDA molecules displays a lying down structure with two different domains on Ag (110) and Cu(100) but three domain on Cu(111) surface. Compared with the one on the inert Au surface, a strong interface interaction between the molecules and Cu, Ag substrates plays an important role in determining the orientation and bonding state of the organic films
Boufarguine, Majdi. "Etude de la déformation de gouttes à interface et rhéologie complexes." Phd thesis, Université du Maine, 2011. http://tel.archives-ouvertes.fr/tel-00954404.
Повний текст джерелаRezzaki, Mustapha. "Etude de propriétés physico-chimiques de surface et interface par chromatographie gazeuse inverse à dilution infinie application à l'adsorption de poly(méthacrylate) de méthyle (PMMA) sur alumine et silice." Mulhouse, 1998. http://www.theses.fr/1998MULH0534.
Повний текст джерелаKazar, Mendes Munique. "X-ray photoelectron spectroscopy investigations of resistive switching in Te-based CBRAMs." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS285/document.
Повний текст джерелаConducting bridging resistive random accessmemories (CBRAMs) are one option currently investigated for the next generation of non volatile memories. Data storage is based on switching the resistivity between high (HRS) and low (LRS) resistance states. Under electrical bias,a conductive path is assumed to be created by ions diffusion from the active electrode into the solid electrolyte. Recently, special attention has been drawn to devices containing an elemental semiconductor such as tellurium, operating with reduced currents and less retention failures. In these subquantum CBRAM cells, the filament is thought to contain tellurium , yielding a 1-atomconductance (G₁atom) significantly reduced compared to standard CBRAMs and thus allowing low power operation. In this thesis, we use X-rayphotoelectron spectroscopy (XPS) to learn about electrochemical reactions involved in the switching mechanism of Al₂O₃ based CBRAMswith ZrTe and TiTe alloys as active electrode. Two methods are used: i) non-destructive Hard X-ray photoelectron spectroscopy (HAXPES) to investigate the critical interfaces between the electrolyte (Al₂O₃) and the top and bottom electrodes and ii) Gas Cluster Ion Beams (GCIB), a sputtering technique that leads to lower structure degradation, combined with XPS depth profiling to evaluate chemical depth distributions. To FSIMS measurements are also performed to get complementary in-depth chemical information.The aim of this thesis is to clarify the driving mechanism and understand the chemical changes at both interfaces involved in the forming process under positive and negative polarization as well as the mechanism of the reset operation. For that,we performed a comparison between as-grown state, i.e. the pristine device with a formed state,i.e. the sample after the first transition between HRS and LRS, and reset state, i.e. the sample after the first transition between LRS and HRS.Conducting bridging resistive random access memories (CBRAMs) are one option currently investigated for the next generation of non-volatile memories. Data storage is based on switching the resistivity between high (HRS) and low (LRS) resistance states. Under electrical bias,a conductive path is assumed to be created byions diffusion from the active electrode into the solid electrolyte. Recently, special attention has been drawn to devices containing an elemental semiconductor such as tellurium, operating with reduced currents and less retention failures. In these subquantum CBRAM cells, the filament is thought to contain tellurium , yielding a 1-atom conductance (G₁atom) significantly reduced compared to standard CBRAMs and thus allowing low power operation. In this thesis, we use X-ray photoelectron spectroscopy (XPS) to learn about electrochemical reactions involved in the switching mechanism of Al₂O₃ based CBRAMs with ZrTe and TiTe alloys as active electrode. Twomethods are used: i) non-destructive Hard X-rayphotoelectron spectroscopy (HAXPES) toinvestigate the critical interfaces between the electrolyte (Al₂O₃) and the top and bottom electrodes and ii) Gas Cluster Ion Beams (GCIB), a sputtering technique that leads to lower structure degradation, combined with XPS depth profiling to evaluate chemical depth distributions. To FSIMS measurements are also performed to get complementary in-depth chemical information.The aim of this thesis is to clarify the driving mechanism and understand the chemical changes at both interfaces involved in the forming process under positive and negative polarization as well as the mechanism of the reset operation. For that,we performed a comparison between as-grown state, i.e. the pristine device with a formed state,i.e. the sample after the first transition between HRS and LRS, and reset state, i.e. the sample after the first transition between LRS and HRS
Leclerc, Olivier. "Etude analytique de l'action des dithiocarbonates sur la pyrite : application a la flottation." Paris 6, 1987. http://www.theses.fr/1987PA066474.
Повний текст джерелаBodenes, Lucille. "Etude du vieillissement de batteries lithium-ion fonctionnant à haute température par Spectroscopie Photoélectronique à rayonnement X (XPS)." Thesis, Pau, 2012. http://www.theses.fr/2012PAUU3050/document.
Повний текст джерелаNowadays, lithium-ion batteries occupy a prominent place in the field of energy storage. Phenomena involved in their aging mechanisms are quite well known for operating temperatures close to room temperature. However, their use at high temperatures for applications such as oil drilling, "in situ" sterilization or freight tracking requires some technical issues to be improved: stability of the electrolyte and electrode binders, compatibility electrolyte / separator, aging of active materials and changes of the interfaces. The batteries selected for this thesis consist of a Li(Ni,Mn,Co)O2 lamellar material at the positive electrode and graphite at the negative electrode. To describe aging phenomena related to high temperature, surface analyzes were carried out by X-ray Photoelectron Spectroscopy on the electrodes of batteries cycled at 85 and 120°C. These analyzes reveal the degradation of the positive electrode’s binder, and the changes of electrodes/electrolyte’s interfaces at high temperature compared to ambient temperature
Dague, Etienne Block Jean-Claude. "Physico-chimie des interfaces bactérie - solution aqueuse." [S.l.] : [s.n.], 2006. http://www.scd.uhp-nancy.fr/docnum/SCD_T_2006_0226_DAGUE.pdf.
Повний текст джерелаDague, Etienne. "Physico-chimie des interfaces bactérie - solution aqueuse." Nancy 1, 2006. http://docnum.univ-lorraine.fr/public/SCD_T_2006_0226_DAGUE.pdf.
Повний текст джерелаDague, Etienne. "Physico-chimie des interfaces bactérie - solution aqueuse." Nancy 1, 2006. http://docnum.univ-lorraine.fr/public/SCD_T_2006_0226_DAGUE.pdf.
Повний текст джерелаYounes, Ali. "Exploration de la chimie du polonium." Nantes, 2013. https://archive.bu.univ-nantes.fr/pollux/show/show?id=c66e6849-d62f-47a4-b43f-3ab8c7038d99.
Повний текст джерелаComplexation chemistry of Po(IV) in aqueous solution. Its chemistry in solution is not well understood due to the absence of a stable isotopes and it availability in extremely small quantities. Po is a highly toxic element and is considered as an important component of natural radiation affecting humans. The project intends to perform polonium’s chemistry studies in aqueous solution in order to contribute to better understand its coordination chemistry. A new methodology for the production and purification of Po-210 was first developed by bombarding Bi-209 foil with a 37 MeV alpha beam. The main challenge was to purify a tracer amount of Po-210 (2. 6 10-13 mole) from macroscopic amount of Bi (2. 8 10-2 mole). Po-210 was purified by employing liquid–liquid extraction method using TBP in pxylene from 7M HCl and back extracted into 9M HNO3. Experimental and theoretical studies to specify the nature of Po species were performed showing the presence of PoCl6 2- as a major species and the extracted Po-TBP species were Po(OH)2Cl2. (TBP)2, PoCl4. (TBP)4 and HPoCl5. (TBP)2. Finally, a novel water soluble “N2S2O2/N4O2” macrocyclic complexing agent was designed and synthesized. It presents a priori the good characteristics for Po complexation, i. E. A platform presenting four soft heteroatoms (N/S) and additional two pendant carboxylic groups to complete the octahedral coordination shell suitable for Po(IV) complexation. Its strong affinity for Po(IV) was verified at pH=7,4 and its potential use as a decorporating agent worth to be studied in a future work
Guille, Emilie. "Approche coupl´ee exp´erience/th´eorie des interfaces ´electrode/´electrolyte dans les microbatteries au lithium : application au syst`eme LixPOyNz/Si." Thesis, Pau, 2014. http://www.theses.fr/2014PAUU3045/document.
Повний текст джерелаIn order to overcome the safety issues induced by the use of liquid electrolytes, Li-ion batteries involving solid electrolytes have been considered, leading to an ‘all-solid’ kind of devices, commonly called microbatteries. For such devices, studies on the limiting processes that take place at electrode/electrolyte interfaces need to be done, to understand the electrochemical phenomenons likely to occur at the atomic scale, similarly to the well-known SEI formation. In this goal, methods of computational chemistry can provide both explanatory and predictive breakthroughs. The present work takes part in those issues by intending a study of electrode/electrolyte interfaces, considering LixPOyNz as the solid electrolyte material. Owing to the amorphous structuration of this system, the first barrier to break consists in the search for a suitable model, able to reproduce its real XPS electronic properties. Modelling of XPS spectra has both lead to propose a model of the electrolyte and highlight the possible existence of a new coordinence for nitrogen atoms, up to now unconsidered experimentally. Complementary calculations of Raman spectra, thermodynamic and kinetic data tend to evidence this coordinence, leading to a refinement of the commonly considered diffusion scheme. Finally, this structural model has been used to simulate an electrode/electrolyte interface (LixPOyNz/Si), with the particular aim of studying its adsorption on the electrode and the Li-ion diffusion through the interface
MASSON, MICHELE. "Etude par spectrometrie raman de films tres minces et d'interfaces." Paris 6, 1988. http://www.theses.fr/1988PA066405.
Повний текст джерелаSchaaf, Pierre. "La technique de reflectometrie : sa mise en oeuvre et son application a l'etude de l'adsorption de macromolecules a une interface solide/solution." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13039.
Повний текст джерелаRydzek, Gaulthier. "Assemblage de films polymères par réaction click électrocontrôlée." Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00756082.
Повний текст джерелаDa, Silva Franck. "Cartographie des interfaces protéine-protéine et recherche de cavités droguables." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAF034/document.
Повний текст джерелаProtein-protein interfaces are involved in many physiological mechanisms of living cells. Their characterization at the molecular level is therefore crucial in drug discovery.We propose here new methods for the analysis protein-protein interfaces of pharmaceutical interest. Our automated protocol detects the biologicaly relevant interfaces within the Protein Data Bank structures, droguables cavities, ligands present at the interface and pharmacophores derived directly from the cavities. Our method enables a state-of- the-art of all available structural information about protein-protein interfaces and predicts potential new targets for drug candidates
Roveretto, Marie. "Formation et vieillissement des aérosols : impact de la photochimie hétérogène." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1346.
Повний текст джерелаInterfaces are ubiquitous in the environment, and in addition many key atmospheric processes, such as gas deposition, aerosol and cloud formation are, at one stage or the other, strongly affected by physical and chemical processes occurring at interfaces. Unfortunately, these heterogeneous reactions are not fully understood to date and limit our ability to simulate and quantify the impact of aerosols due to large uncertainties in their formation and their evolution in the troposphere. This thesis aims to improve our knowledge about photochemical reactions at the air/liquid interfaces, which could be crucial for the assessment of their atmospheric impacts. Firstly, the reactivity of stearic acid at the air/water interface under irradiation was studied in different matrices thanks to a very sensitive tool, the Langmuir trough. We observed that monolayers of stearic acid undergo degradation under irradiation, even in the absence of photosensitizers. Experiments with monolayers in different surface states indicate that surface pressure influences this reactivity. APCI-Orbitrap coupling was used to detect and identify halogenated compounds produced from an irradiated solution containing a photosensitizer, 4-benzoylbenzoic acid. The effects of octanol as a surfactant and citric acid as a proton donor on these photosensitized reactions were also examined. In addition, the formation of secondary aerosols and their aging in the marine environment (at Cape-Verde) were studied in different conditions. The experiments clearly demonstrate the existence of photosensitized processes at the air/sea interface as a source of marine secondary aerosols. Finally, work on the photochemistry of organic matter from phytoplanktons gave information on their reactivity in the liquid phase. Overall, the results obtained during this thesis show that the photochemistry studied here can have a significant impact on the superficial microlayer of the oceans and, by extension, on marine aerosols
André, Loïc. "Synthèse de matériaux composites à base d'oxydes préformés : de la compréhension des mécanismes de déstabilisation de sols multiconstituants à l'étude des propriétés des hétéroagrégats." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00827971.
Повний текст джерелаHermans, Yannick. "Interface analysis and development of BiVO4 and CuFeO2 heterostructures for photochemical water splitting." Phd thesis, Bordeaux, 2019. http://tuprints.ulb.tu-darmstadt.de/8700/1/Complete_thesis%20-%20German.pdf.
Повний текст джерелаAlonso, Coralie. "Empilements moléculaires bi- et tridimensionnels d'alcools chiraux." Université Joseph Fourier (Grenoble), 1999. http://www.theses.fr/1999GRE10093.
Повний текст джерелаGeyer, d'Orth Arnaud de. "Etude structurale des microemulsions dans un domaine d'inversion : mise en evidence d'une structure bicontinue cubique." Paris 6, 1987. http://www.theses.fr/1987PA066052.
Повний текст джерелаAllongue, Philippe. "Etude de l'interface gaas/electrolyte : apport des mesures de photocapacite et des modifications de surface par depot electrolytique de metaux." Paris 6, 1988. http://www.theses.fr/1988PA066017.
Повний текст джерелаBoyer, Benjamin. "Heligeom : a multiscale approach to studying biomolecular helical assemblies with an application to RecA fillaments." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066579/document.
Повний текст джерелаRecent progress in methods for low resolution structural determination (electron microscopy, small angle neutron or X-ray scattering) and 3D cell imaging reveal the importance of supramolecular assemblies in the cell function. These structures are presently out of the reach of classical molecular modeling methods, which are limited to the study of medium size assemblies. We propose a multi-scale approach called Heligeom, based on the screw representation of movements, which enables linking the atomic scale to the scale of large assemblies. This approach builds on the property of molecular assemblies to self-organize into a large variety of geometric motifs such as helices, rings of linear filaments. Coupled to the exploration of protein-protein assembly modes using docking or Monte Carlo simulations, this approach allows identifying and combining such motifs. Application of Heligeom to study the filaments of RecA, a member of the recombinase protein family, shed new light on the modes of RecA self-association and the diversity of corresponding geometries, as well as the structural consequences of introducing irregularities in these oligomers. The Heligeom suite of computational tools is freely available in the PTools library
Crémoux, Tatiana. "Physico-chimie aux interfaces de systèmes vitreux à charge d'espace." Thesis, Bordeaux 1, 2013. http://www.theses.fr/2013BOR14972/document.
Повний текст джерелаThe purpose of this work is to control physicochemical properties of glasses surfaces using a thermal polarization treatment. For this, the implementation of a space charge layer has been characterized for various silicates and borosilicates glasses. These comparative studies have shown that cations depletion from anode toward cathode induces both an electric field and structural local changes. To go further, we demonstrated that there is a plasma formation between anode and glass surfaces which could be the cause of ionic exchange phenomena leading to the formation of nitrogen NO2/N2O4 entities entrapped inside glass network. Subsequently, physicochemical properties studies of polarized surfaces were performed. Preliminary results concerning the space charge influence on (i) surface wettability, (ii) surface chemistry and (iii) optical responses of adsorbed molecules on poled glass surface have been obtained
Épinat, Chloé. "Morphology development and rheological properties of reactively compatibilized Polyamide 6 / High Density Polyethylene blends." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10317/document.
Повний текст джерелаThe aim of this work is to understand the parameters that control the morphology development mechanisms, and especially, the formation of nanodispersions. This study deals with binary blends of polyamide 6 of different molecular weights and maleic anhydride grafted high density polyethylene, processed by reactive extrusion. The strategic choice of blend components allowed to cover a wide range of viscosity ratio and various copolymer architectures formed at the interface. Mechanisms controlled by classical rheological laws were methodically isolated from mechanisms specific to the compatibilization reaction at the interface by studying, on the one hand, uncompatibilized PA6/HDPE blends, and on the other hand, the effect of the compatibilization reaction in static condition. Different drop break-up mechanisms based on capillary instabilities are proposed depending on viscosity ratios. The observation of ordered microphase separated copolymer domains at the interfaces in static condition attests of the spontaneous interface destabilization, strongly related to the copolymer asymmetry. Blends rheological properties are then studied. The different relaxation mechanisms obtained are discussed, especially those related to the interfaces and interactions between droplets, relatively to blends morphologies. In compatibilized blends, gel-like or solid-elastic behavior (strong elasticity increase at low frequencies) for concentrated blends, suggest the creation of a percolating network of interactions between neighboring droplets. Finally, an efficient model for predicting the phase inversion composition from the rheological behavior is proposed