WorldCat Identities

École doctorale Physique et chimie-physique (Strasbourg / 1994-....).

Overview
Works: 359 works in 365 publications in 2 languages and 366 library holdings
Roles: Other, 996
Publication Timeline
.
Most widely held works by École doctorale Physique et chimie-physique (Strasbourg / 1994-....).
Complexes de métaux de transition organisés dans des nanostructures lamellaires hybrides fonctionnelles by Séraphin Eyele-Mezui( Book )

3 editions published between 2011 and 2016 in French and held by 3 WorldCat member libraries worldwide

This PhD work allowed to elaborate new multifunctionnal inorganic/organic hybrid materials. We showed that it was possible to functionalize the interlayer space of Layered Simple Hydroxides by transition metal complexes (phthalocyanine complexes, Schiff bas complexes and ruthenium polypyridine complexes) via an anionic exchange mechanism. We thus developed a new synthetic procedure, called “indirect synthesis”. We have succeeded to overcome the numerous difficulties linked to the insertion grafting of coordination complexes. The insertion of such complexes allowed to precise the mechanism of the magnetic ordering of theses hybrid materials. The insertion of copper phthalocyanine allows to benefit from an internal paramagnetic probe in-between the inorganic layers, and thus to evaluate the internal field resulting from the magnetic ordering of the material. Finally, with this approach, we have been able to obtain new functional magnets, combining magnetism and chirality, or magnetism and luminescence
Étude du bruit de fond induit par les nano-faisceaux de SuperKEKB et préparation de l'analyse de physique de Belle II by Daniel Cuesta( )

2 editions published between 2016 and 2019 in French and held by 2 WorldCat member libraries worldwide

Analysis of dust emission in nearby galaxies : implications of the modeling assumptions by Jérémy Chastenet( )

2 editions published in 2017 in English and held by 2 WorldCat member libraries worldwide

My thesis focused on the implications of dust emission modelisation choices on its derived properties in nearby galaxies. A first approach showed that all models do not fit observations of two nearby galaxies adequately and similarly, although they all managed to fit the Milky Way infrared emission. It also highlighted that the dust composition is not the same between those two galaxies, and also with that of the Milky Way. The choice of the dust grains environment, through the incident radiation field, can significantly impact results like the total dust masses. A second project investigated the systematics errors due to the empirical laws used to describe the radiation field that heats the dust grains. I showed that some parameters can be over- or underestimated, while showing good fits to the observations. These results show that it is important to take into consideration the choices made for modelisation in order to accurately determine dust properties in nearby galaxies
Etude des résines à amplification chimique 193 nm de tonalité positive ou négative pour une application microélectronique sub65 nm by Michael Julian May( )

2 editions published between 2008 and 2017 in French and held by 2 WorldCat member libraries worldwide

This work focuses on the study of photoresists. The fabrication process of integrated circuits requires their use for generating the resist patterns which later serve as a mask during an etch step that transfer the patterns into the substrate. Therefore, we have studied the etch behaviour of negative and positive 193 nm resists when exposed to a chosen oxide etch plasma. The resist analyses have pointed out that the resist deprotection that occurs during the etch is linked to the acrylic monomers that are part of the resist. The evaluation of model polymers and formulations has then permitted to determine wich parameters are relevant to improve the etch resistance of 193 nm resists. We have then also studied the resolution limit of a negative tone resist using an immersion interferometer. This work has enabled to show that, in spite of the progress realized in the negative tone resist development, this tonality is not competitive compared to the common tonality
Synthèse de nanotubes de carbone monofeuillets individuels et composites modèles polymères - nanotubes de carbone : application à l'effet photovoltaïque by Diana Salem( )

1 edition published in 2012 in French and held by 2 WorldCat member libraries worldwide

The aim of this work is to develop composite materials carbon nanotubes/polymers to take advantage of properties of carbon nanotubes at macroscopic scale. To get such materials, homogeneous functionalization between carbon nanotubes and polymers is required, carbon nanotubes must be individual with the same chemical reactivity, therefore the same diameter. Thus, they must be synthesized by CVD from monodispersed and supported catalyst nanoparticles. In the first part, we developed a new universal method for the synthesis of metal oxide supported nanoparticles. We mainly detailed the synthesis of Fe2O3 nanoparticles with size distribution of 1.1 ± 0.3 nm. In the second part, after studying the thermal stability of these nanoparticles, we used them to catalyze the growth of individual single wall carbon nanotubes by CVD. The caracterisation of the obtained nanotubes by Raman show exceptionally narrow diameter distribution of 1.27 ± 0.15 nm. In the third section, we first studied the dispersion of carbon nanotubes by noncovalent functionalization withhydro-soluble polymer POE with pyrene as end group and revealed depletion phenomena that limit the solubilization of nanotubes. Then we developed composite materials carbon nanotubes/rrP3HT by covalent and noncovalent functionalisation and we studied the efficiency of charge separation in both cases of functionalization
Synthèse et caractérisation de matériaux thermoplastiques issus de ressources renouvelables pour l'élaboration d'une membrane d'isolation by Elodie Hablot( Book )

2 editions published in 2009 in French and held by 2 WorldCat member libraries worldwide

Nowadays, replacing petroleum-based raw materials with renewable resources is a major concern in terms of both economical and environmental viewpoints. In this context, the goal of this work was to develop new green isolation materials. Vegetable oils, essentially constituted from triglycerides, were expected to be an ideal alternative chemical feedstock because of their lots of active chemical sites that can be used for polymerization. Two main materials corresponding to the desired properties were developed: one thermoplastic polyamide (DAPA) and one thermoplastic polyurethane (TPU); both issued from dimer fatty acids. Ageing under UV, temperature and water was performed on DAPA in order to evaluate the evolution of structure of the materials under these conditions and validate them for the future application. Moreover, in order to improve the mechanical properties of DAPA, polyamide-based biocomposites were prepared by adding cellulose fibres in the matrix. Studies of mechanical properties, especially by micromecanical modelling were investigated and showed the influence of cellulose fibres on the Young modulus, the yield stress and the elongation at break. Additional experiments showed limited affinity between the fibre and the polyamide matrix. Modification of the cellulose surface energy was thus investigated by chemical modification surface in order to improve the affinity fibres/DAPA. This work has revealed that the grafting of dimer fatty acid on cellulose surface increased significantly the affinity fibre/matrix and the mechanical properties of the resulting biocomposite
Assemblage de films polymères par réaction click électrocontrôlée by Gaulthier Rydzek( )

1 edition published in 2012 in French and held by 1 WorldCat member library worldwide

Polyelectrolyte multilayer films, built by alternated adsorption of polycations and polyanions, face two main challenges: their construction process is tedious and their mechanical stability is poor. We developped a layer-by-layer strategy to improve the film stability by covalent reticulation of the polymers chains by click chemistry. Polymers bearing alkyne and azide functions were reticulated by triggering electrochemically the production of Cu+ catalyst ions. A one pot morphogen driven self-construction strategy was also developped to improve the buildup process of the films.In this case, all the constituants are simultaneously present in solution while the film grows up only at the electrode. Films based on covalent, host-guest and supramolecular interactions were obtained and the possibility of combining different interactions was also demonstrated. Nanoparticles were also included in layer-by-layer and self-constructed films in order to improve the electrode specific area
Polymer multilayers : fundamental aspects and application for biomaterials by Lydie Séon( )

1 edition published in 2014 in English and held by 1 WorldCat member library worldwide

Impact of symmetry of oxygen vacancies on electronic transport in MgO-based magnetic tunnel junctions by Beata Taudul( )

1 edition published in 2017 in French and held by 1 WorldCat member library worldwide

In sprintronics, the study of multilayer heterostructures composed of a ferromagnetic electrodes and a thin insulating layer, i.e. magnetic tunnel junctions (MTJs), is of special importance. The canonical systems are MTJs made of Fe/MgO/Fe where hight tunneling mangetoresistance ratio (TMR) values were measured. The crucial factor defining the junction performance is the structural imperfection appearing in a real devices. In our work we focused in particular on oxygen vacancies in MgO. By means of density functional theory we studied ground state electronic properties of single and double oxygen vacancies, referred as F and M centers, respectively, in bulk MgO. We then switched to full junctions where we investigated the impact of vacancies on the ballistic transport. We demonstrated that M centers played a superior role and proved that coherent transport, preserving electrons spin and symmetry, is possible in presence of paired vacancies
Élaboration de nano-objets magnétiques dendronisés à vocation théranostic by Aurélie Walter( )

1 edition published in 2014 in French and held by 1 WorldCat member library worldwide

This thesis presents the design of dendronized magnetic nano- objects for both diagnostic imaging by MRI and magnetic hyperthermia therapy (HM). In vitro and in vivo validation of these nano-objects properties and the demonstrattion of their effectiveness for specific targeting of tumors are reported. A state of the art on the synthesis of metal oxide NPs, their functionalization and their properties in MRI and HM is presented. The influence of the NPs iron oxide functionalization method and the influence of the molecule architecture on the colloidal stability and relaxivity were studied. NPs of different sizes, morphologies and composition were then synthesized and functionalized with a dendron molecule and the MRI and HM properties were investigated. The specific targeting of melanin in melanoma was demonstrated
Impact of preclinical PET scanner characteristics on the overall image quality by Kajal Aggarwal( )

1 edition published in 2019 in English and held by 1 WorldCat member library worldwide

Positron Emission Tomography (PET) is one of the nuclear imaging techniques, used in the field of oncology, cardiology and neurology as a functional imaging modality. During the last three decades, advancement of PET modality and the development of animal models of human disease have lead to the development of PET technology dedicated to small animals. Due to the size difference between humans and mice, small animal scanners require improved spatial resolution. Due to the improved spatial resolution, the voxel size decreases significantly thereby, reducing the number of signals from a voxel. Higher the detected counts, higher the signal-to-noise ratio (SNR), thus improvement in the detection efficiency also plays an important role. Our objective is to study the impact of PET scanner characteristics on the overall image quality. To achieve this, we have simulated four different scanner designs. The idea behind the selected scanner designs studied in this thesis is to progressively add an extra dimension in the estimated position of interaction of the gamma photon, i.e., going from 2D detection to 3D detection. We demonstrated that it is possible to decouple the spatial resolution and detection efficiency, improving both simultaneously. Further, we characterized that improving spatial resolution results in improved Recovery Coefficient (RC). Detection efficiency impacts the SNR, which further impacts the estimated error in the RC values. However, there are other factors such as image reconstruction approach and normalization corrections that degrade these error values. Thus, it is important to not only improve the performance parameters of the scanners but also to accurately implement the image reconstruction process, so as to correctly quantify the improvement in the image quality
Développement d'un dispositif médical innovant pour la prise en charge prénatale de la hernie de coupole diaphragmatique by Nicolas Sananès( )

1 edition published in 2017 in French and held by 1 WorldCat member library worldwide

We developed a new balloon for Fetal Endoscopic Tracheal Occlusion (FETO) which allows an easy, remotely controlled, and non-invasive reversal occlusion. This "Smart-TO" balloon to overcome issues related to the airway reestablishment. The technology is based on a magnetic valve whose opening is actuated by the fringe field of an MRI scanner. The opeing of the valve induces the deflation of the balloon, which is then washed out by the fluid coming out from the lungs. The impermeability, occlusion and operation tests are promising. A very first experimentation on the monkey model showed appropriate functionality and operation of the "Smart-TO" balloon. Further in vitro and animal tests are planned. A patent has been filed in 2016. Preliminary risk analysis, regulatory routes exploration, and market study have been started but are still ongoing
Développement de capteurs à pixels CMOS pour un détecteur de vertex adapté au collisionneur ILC by Yunan Fu( )

1 edition published in 2012 in English and held by 1 WorldCat member library worldwide

The thesis has been a priority as taking ownership of vertical integration technologies used in the industry to realize a multistage development, and to evaluate the contributions on CMOS pixel sensors (CPS). 3D integration technologies (3DIT) provide a way to mitigate this hampering correlation between speed and resolution, since they allow to staple layers of readout circuitry on top of the sensing layer, which results in a drastic increase of the functionalities located in (the shadow of) each pixel. A multi-layer structure allows for a higher spatial resolution because more and more transistors may be integrated vertically in a relatively small pixel. Moreover, bringing the components of the sensor closer to each other translates in a faster readout, owing to the reduction in the average length of the inner connecting wires. Vertical integration also opens up the possibility of combining different technologies best suited to each of the sensor main functionalities (signal sensing, analog and digital signal processing and transmission). It overcomes the limitations in this way from the foundry manufacturing parameters, which do not allow to fully exploit the potential ofCPS with a single CMOS technology. 3D-CPS are thus expected to overcome most of the limitations of standard 2DCPS, and are therefore suspected to over new perspectives for the innermost layer of the ILC vertex detector
Développement de la spectrométrie gamma in situ pour la cartographie de site by Fabien Panza( )

1 edition published in 2012 in French and held by 1 WorldCat member library worldwide

The high-resolution gamma spectrometry currently provides a powerful analytical tool for performing environmental measurements. In the context of radiological characterization of a site (natural or artificial radioactivity) and for the dismantling of nuclear installations, mapping of radionuclides is an important asset. The idea is to move a HPGe spectrometer to study the site and from nuclear and position data, to identify, to locate and to quantify the radionuclides present in the soil. The development of this tool follows an intercomparaison (ISIS 2007) where an intervention / crisis exercise showed the limits of current tools. The main part of this research project has focused on mapping of nuclear data. Knowledge of the parameters of an in situ spectrum helped to create a simulator modeling the response of a spectrometer moving over contaminated soil. The simulator itself helped to develop algorithms for mapping and to test them in extreme situations and not realizable. A large part of this research leads to the creation of a viable prototype providing real-time information concerning the identity and locality as possible radionuclides. The work performed on the deconvolution of data can make in post processing a map of the activity of radionuclide soil but also an indication of the depth distribution of the source. The prototype named OSCAR was tested on contaminated sites (Switzerland and Japan) and the results are in agreement with reference measurements
Propriétés magnétiques de matériaux hybrides lamellaires incluant des phthalocyanines métallées : essais en vue d'un couplage entre le magnétisme et la conductivité by Riadh Bourzami( )

1 edition published in 2014 in French and held by 1 WorldCat member library worldwide

This PhD work focus on hybrid layered organic-inorganic materials, with general formulation Mx(OH)2x-ny(Xn-)y (M(II)=Co, Cu; X- = metal phthalocyanine sulfate MPcTs). Two leading ideas founded this PhD work: i) the investigation of the possible interplay between the magnetic properties of the LSH hosts and possible charge transport through phthalocyanine guests ii) the experimental evidence of the underlying mechanism for magnetic ordering in LSH. Synthesis of new molecules was required, as LiPcTs and Zn LSH. The yield of the synthesis of LiPcTs was not high to allow for subsequent insertion. The next route under investigation considered the anions and cations issued from the reduction and oxidation of CuPc and CoPc. Those revealed much too instable to be inserted into lamellar hosts. The investigations of the magnetic properties by SQUID magnetometry showed that all copper hydroxide-based compounds behave similarly, presenting an overall antiferromagnetic behaviour without magnetic ordering. The cobalt HSL compound presents a ferrimagnetic ordering around 6K, whatever the nature of the metal phthalocyanine. This points to the solely dipolar interactions between the inorganic layers. Using the inserted CuPc as a fine paramagnetic probe, X-band and Q-band EPR spectroscopy allowed to assess the amplitude of the dipolar field Bdipolar≈30mT. These measurements validate the theoretical model of M. Drillon and al on the role of dipolar interactions in layered ferromagnets. The formation of EPR silent aggregates of inserted CoPc discards it as a suitable probe for similar experiments. Preliminary results show that these hybrids catalyze the reduction of O2
Chiral complexes in catalysis and non-linear optics : study of non-linear effects in asymmetric catalysis and of sum-frequency generation by Yannick Geiger( )

1 edition published in 2019 in English and held by 1 WorldCat member library worldwide

Un effet non-linéaire (NLE) hyperpositif a été observé dans l'addition énantiosélective de dialkylzincs sur du benzaldéhyde catalysée par un ligand chiral éphédrine N-benzylé. Ceci est la première preuve expérimentale d'un NLE hyperpositif, où le ee de produit maximal n'est pas obtenu avec un catalyseur énantiopur mais scalémique. L'origine de ce NLE hyperpositif a été identifiée comme venant d'un double système catalytique où des catalyseurs monomériques mais aussi dimériques homochiraux catalysent la réaction, avec des énantiosélectivités différentes. Avec un ligand scalémique, la précipitation d'un aggrégat hétérochiral diminue la quantité de catalyseur homochiral actif et en solution, déplaçant ainsi l'équilibre du catalyseur agrégé vers son homologue monomérique et plus énantiosélectif. Le système catalytique a été étudié en variant la concentration de catalyseur et la température, en déterminant l'état d'agrégation du catalyseur par RMN 1H DOSY, par des études cinétiques et des courbes de Hammett. Une version ditopique du ligand a également été étudiée pour ces effets non-linéaires en catalyse, qui se sont avérés être en partie hyperpositifs. De nouveaux métallopolymères constitués d'un ligand ditopique chiral et d'un métal ont été développé pour l'application en génération de somme de fréquence (SFG). Les ligands sont préparés par la double addition d'un aminoalcool ou d'une diamine chirale sur du terephtaldehyde pour obtenir des bis-imine-1,4-phenylènes absorbant vers 300 nm. Certains de ces complexes montrent une très forte activité en SFG mais s'avèrent être sensible à l'humidité et donc être difficile à manipuler. Une variante plus stable à base d'une 2-aminoaniline chirale a été développée par la suite et ces propriétés en spectroscopie UV-visible ont été étudiées
Etude par les techniques avancées de microscopie électronique en transmission de matériaux fragiles by Dris Ihiawakrim( )

1 edition published in 2019 in French and held by 1 WorldCat member library worldwide

The present manuscript shows the importance of methodological and technical development to identify and to unblock locks preventing the analysis of hybrid and complex materials that undergo degradation under electron beam irradiation. We have shown that beam-induced damage to the sample only appears above some specific threshold of current density. Such a threshold depends on the nature of the material and on its morphological and structural characteristics. These developments in synergy with the use of Cryo-EM, allowed us to expose the architecture of carbon-based hybrid materials, measure the variation of the lamellar distance in a perovskite according to the molecular spacer and to the positioning of the metal, identify the interactions at the interface between two molecular crystals, and the 3D quantification of the functionalization within a MOF. Lastly, we brought to light the processes of nucleation and growth of iron oxide by in-situ liquid phase TEM
Modifications photo-induites de membranes modèles by Georges Weber( )

1 edition published in 2012 in English and held by 1 WorldCat member library worldwide

Our contribution to research in the area of lipid oxidation in eukariotic cells is based on the central intuition that progress can only be achieved in new biomimetic membrane systems where the spatial localization of the oxidation events might be controlled and monitored. Accordingly, we have developed new photosensitizer agents that can be anchored in Giant Unilamelar Vesicles (GUVs). It is important to stress that progress in the control of the spatial distribution of oxidation allows for a selection of the oxidation pathways, as we show in this study for the particular case of hydroperoxidation, and therefore constrains anti-oxidant strategies. In association with new tools for the quantification of the oxidation events, these new models have provided a complete scenario for the hydroperoxidation mechanisms, from the production of the oxidant species (1O2) to the final chemical and physical modifications induced on the self-assembled bilayers. We report that GUVsare able to survive full hydroperoxidation, showing that membrane integrity can be preserved under these oxidation conditions. Our experimental setup allows to measure the relative area increase produced upon peroxidation, the associated change in mechanical properties of the membrane and also the hydroperoxidation efficiency, all of them with good precisions. Further insights into the molecular modifications under oxidation have been studied at the air -water interface, using lipid monolayers
Design and advanced characterization of PMMA-coated Ti surfaces for biomedical applications by Melania Reggente( )

1 edition published in 2017 in English and held by 1 WorldCat member library worldwide

Des matériaux sandwichs fabriqués sans colle époxy on été conçu pour réduire les contraintes mécaniques, ou “stress shielding”, entre l'os environnant et l'implant. Le titane (Ti) et le polyméthacrylate de méthyle (PMMA) sont les matériaux les plus utilisés dans les applications biomédicales, et on été choisi comme composants de base. Pour cela, on a élaboré des interfaces Ti/polymère dans lesquelles le métal et le polymère sont liés par une liaison covalente; cette couche de polymère permettra ultérieurement l'adhésion entre le métal et une feuille de polymère qui constituera le cœur du sandwich. Dans ce but, une stratégie en trois étapes permettant d'obtenir une fonctionnalisation de la surface du titane a été développé. Tout d'abord, la surface du Ti a été activée chimiquement; ensuite un initiateur de polymérisation y a été greffé de façon covalente. Enfin, la croissance des chaines polymères a été obtenue en utilisant une polymérisation par transfert d'atomes à partir de l'initiateur (SI-ATRP). Les sandwichs ont été préparés en insérant une feuille de polymère entre les deux feuilles de Ti recouvertes de polymère greffé et en pressant les trois composants à une température supérieure à celle de la transition vitreuse du polymère
Studying the interfacial exchange coupling within ferrite based magnetic nanoparticles prepared following to a succession of thermal decomposition synthesis by Kevin Sartori( )

1 edition published in 2019 in English and held by 1 WorldCat member library worldwide

The use of rare earths in data storage devices is expensive and polluting. Their replacement with iron oxide would make it possible to avoid this. Below a size of 20 nm, iron oxide nanoparticles cannot be considered as permanent magnet. An alternative is to combine them with another magnetic phase to enhance their magnetic anisotropy via interfacial exchange coupling within [email protected] nanoparticles. However, the magnetic stability of the latter remains insufficient. The scope of this thesis is to design a new type of magnetic nanoparticles of [email protected]@shell structure with a Fe3-dO4 core and CoFe2O4, CoO or NiO as shells which has further enhance the magnetic properties while maintaining a size below 18 nm. The in-depth study of their structure-properties relationship was carried out using a wide set of analytical techniques
 
moreShow More Titles
fewerShow Fewer Titles
Audience Level
0
Audience Level
1
  General Special  
Audience level: 0.00 (from 0.00 for Complexes ... to 0.00 for Complexes ...)

Alternative Names
École doctorale 182

ED 182

ED182

PCP

Languages
French (17)

English (9)