Claudie Josse

Centre de Microcaractérisation Raimond Castaing

Mismanaged plastic waste interacts with secondary environmental pollutants, potentially aggravating their impact on ecosystems and human health. Here we characterized the natural and artificial radionuclides in polyethylene terephthalate bottles collected from the industrial littoral discharge of a phosphate fertilizer plant. The activity concentra...

In this study we demonstrate the effect of change of the sputtering power and the deposition pressure on the ignition and the combustion properties of Al/CuO reactive thin films. A reduced sputtering power of Al along with the deposition carried out at a higher-pressure result in a high-quality thin film showing a 200% improvement in the burn rate...

Reactive multilayer films are a high energy dense configuration for energetics widely studied for various pyrotechnic applications. The objective of this study is to investigate the influence of substrate–induced localized stress on the combustion properties of Al/CuO reactive thin films. Square microbumps are patterned on glass substrates to serve...

Application of protective coatings is the most widely used conservation treatment for outdoor bronzes. Eco-friendly and non-hazardous coatings are currently needed for conservation of outdoor bronze monuments. To fulfil this need, the M-ERA.NET European research project B-IMPACT (Bronze-IMproved non-hazardous PAtina CoaTings) aimed at assessing the...

Gilded copper hollow spherical pendants known as gombiky (s. gombik) were examined to identify the technology of gilding and the material chosen as the substrate. The examined ornaments dating from the ninth and tenth centuries AD were recovered from elite graves of two major political, ecclesiastical and economic centres of the Early Medieval peri...

The application of protective coatings for the conservation of outdoor metallic artworks is currently considered the best approach actively employed. This paper focuses on the evaluation of the protectiveness of an optimised fluorosilane (FA-MS) coating with low occupational hazard impact and high inhibition efficiency. FA-MS coating was applied on...

Thermite multilayered films composed of alternating thin layers of metal/oxidizers have various uses in microelectromechanical systems (MEMS), microelectronics and materials bonding applications. Recently, applied research especially on the micro-initiator applications has engendered an urgent need to improve ignitability without changing the layer...

Tremendous efforts have been invested in the development of the internet of things during the past 10 years. Implantable sensors still need embedded miniaturized energy harvesting devices, since commercialized thin films and microbatteries do not provide sufficient power densities and suffer from limited lifetime. Therefore, micro‐supercapacitors a...

Much effort has been put in the past for describing the structure of graphite spheroids and for suggesting a growth mechanism from these observations. Many theories have emerged, but none of them is yet fully established and accepted 70 years after the patent on manufacturing spheroidal graphite cast irons. In the meantime, observations with optica...

A two-year M-ERA.NET project – the Bronze-IMproved non- hazardous PAtina CoaTings project (B-IMPACT) – focused on this conservation issue with the aim of promoting innovative, eco- friendly, and non-hazardous protection treatments for outdoor patinated bronze. Two types of sand-cast bronzes (traditional Cu-Sn-Zn-Pb and modern Cu-Si-Mn foundry alloy...

Differential thermal analyses of an AlSi6Cu4Fe2 alloy at various cooling rates from the liquid state were performed which showed: i) possible discrepancies in the first solidification steps and; ii) solidification ending with multiple peaks at low cooling rate. Metallographic observation of the samples gave hint for understanding the discrepancies...

When attempting to sufficiently protect outdoor bronze monuments from corrosion, searches for an effective solution are usually based on coating applications which have a high anticorrosive efficiency. In order to correctly assess the level of protection provided by such coatings, adherence (practical adhesion) measurements need to be performed for...

Bronze reacts with oxygen, humidity, and pollutants in the atmosphere so that a patina forms. Natural exposure to an outdoor atmosphere can be simulated and accelerated in order to achieve a patina that mimics outdoor ancient patina. In order to avoid the uncontrolled dissolving of either the natural or artificially formed patina, protection of the...

To study the influence of hydrogen on the intergranular corrosion mechanism of a 2024 aluminium alloy, samples were hydrogen precharged by cathodic polarisation and then exposed to a NaCl solution. EBSD analyses and SEM observations showed that hydrogen increased the number of corroded interfaces and led to the embrittlement of low-angle grain boun...

A 3-mercapto-propyl-trimethoxysilane coating (PropS-SH) applied on Cu-Si-Mn bronze, patinated by “liver of sulphur”, was investigated as a non-toxic alternative to Incralac®, usually applied on outdoor artistic bronzes. Electrochemical testing was performed in synthetic acid rain. Exposure to temperature/UV cycles and ac- celerated corrosion test s...

Aims: This study explored the lateral crest structures of adult cardiomyocytes (CMs) within healthy and diseased cardiac tissue. Methods and results: Using high-resolution electron and atomic force microscopy, we performed an exhaustive quantitative analysis of the three-dimensional (3D) structure of the CM lateral surface in different cardiac c...

There is a miscibility gap in the CoFe2O4-Co3O4 phase diagram. In this miscibility gap, the oxides can be subjected to a spinodal transformation. It has already been observed in oxides consisting of crystals greater than or equal to 100 nm that the spinodal decomposition leads to the formation of two alternating iron-rich and cobalt-rich spinel pha...

Since the establishment of the coastal industrial complex in Gabes city (Gulf of Gabes, SE Tunisia), hundred million tons of untreated phosphogypsum have been discharged in the open sea causing serious environmental problems. To better understand the dynamic and behavior of phosphate/phosphogypsum contaminants from raw ores to marine environment, a...

The corrosion behaviour of AA 1370 in different metallurgical states was studied in chloride-containing sulphate solutions. The microstructures of a rod, a deformed strand and an annealed strand constitutive of wires were examined using scanning electron microscopy, transmission electron microscopy and electron backscattered diffraction. Results of...

Copper and 1 vol% carbon nanotube-copper cylinders with a micrometric copper grain size and either a unimodal or a bimodal grain size distribution were prepared using spark plasma sintering. The cylinders served as starting materials for room temperature wire-drawing, enabling the preparation of conducting wires with ultrafine grains. The tensile s...

In order to bring the treatment of historical bronze monuments in line with proper engineering practice and cultural heritage regulations, the standardisation of artificially aged surfaces that are comparable with natural ones is still to take place. In this aim, this investigation reports a comparative study of corroded quaternary bronze samples p...

Eutectoid transformation in cast irons may proceed in the stable or the metastable systems giving ferrite and graphite for the former and pearlite for the latter. The present work demonstrates that composition profiles across ferrite/pearlite boundaries are smooth and similar to those issued from the solidification step. No trace of long-range diff...

FeNiCr samples (800HT) were exposed at 570 °C, 1 bar to a 47.25CO-47.25H2-5.5H2O atmosphere (ac = 33) flowing at 18 μm/s. Pitting corrosion was observed. Pits showed a flattened morphology and a constant pit diameter growth rate. Corrosion rings appeared successively at the surface during pit growth. A four-step mechanism is proposed which includes...

Carbonated Biomimetic Nanocrystalline Apatite (BNAc) coatings are obtained for the first time by Cold Spray. The coatings are characterized by FTIR, Raman, XRD, and SEM and compared to the powders. No significant chemical and structural changes are detected and the nanostructure features of these very reactive BNAc are preserved in the coating. The...

The microstructure of a high-purity Al-6.5Si-1Fe (wt pct) alloy after solidification at various cooling rates was investigated. In most of the cases, the monoclinic beta-Al9Fe2Si2 phase was observed as long and thin lamellae. However, at a very slow cooling rate, Fe-bearing precipitates with Chinese script morphology appeared together with lamellae...

The influence of a lanthanum sol–gel coating on the oxide scale adherence has been studied during the 330Cb (Fe–35Ni–18Cr–1Nb–2Si) oxidation at 900 °C, in air. The alloy oxidation is performed in order to generate a protective chromia scale acting as a good barrier against carburization. Argon annealing of lanthanum sol–gel coatings have been perfo...

The corrosion behaviour of AA2050-T8 was studied after polishing and after laser shock processing (LSP) treatment using the electrochemical microcell technique and the SVET. After polishing, pitting at constituent particles and intergranular corrosion were observed. By contrast, no intergranular corrosion developed after LSP. Microcell measurements...

The Inconel 601 alloy oxidation was performed in air, in the temperature range 1000–1150 °C, during 90 h. Kinetic results show that the parabolic behavior is always followed in this temperature range. The Arrhenius plot of the kp values shows two different activation energies. Between 1000 and 1050 °C the activation energy is Ea1 = 160 ± 10 kJ/mol....

In the present paper, juvenile and adult shells of the green ormer Haliotis tuberculata ('Oreille de Saint-Pierre') were perforated in a zone close to the shell edge and the shell repair process was followed at two levels: (1) by observing the histology of the calcifying mantle in the repair zone and (2) by analyzing with SEM the microstructure of...

We present in this poster the preliminary results of the TiO2 nanostructures growth on the silicium substratum. We have utilized two different methods: VLS/MOCVD method and MOCVD in the catalyst presence. In the case of VLS/MOCVD method, the growth is catalyzed by metallic clusters layer or metallic oxides. In the case of MOCVD method, the catalyst...

The growth of paratellurite single crystals by the vertical-gradient freezing technique is reported for the first time. Boules of 120mm long and 25mm in diameter were obtained under a temperature gradient of 10°Ccm−1 and translation rates lower than 0.6mmh−1. The spatial distribution of defects along the growth axis reveals a continuous evolution o...

This study is concerned with the growth and characterization of metallic gallium 3D structures, obtained with a single growth step, by the LP-MOCVD technique on various substrates. Commercial organo-metallic is used as gallium precursor and nitrogen as carrier gas. The growth temperature and the reactor pressure are ranking between 500 and 700 °C,...

GaAs (1 0 0) substrates have been heat-treated in a metal-organic chemical vapor deposition reactor under flows of NH3 and an oxygen organo-metallic precursor at temperatures between 650°C and 750°C. Yellowish films formed at the surface of all the samples. Gallium, nitrogen and oxygen were detected by EDX analysis of the films. The oxygen content...

A numerical method is described for determining the surface stress distribution under straining conditions from the real microstructure of materials containing local heterogeneities. The method is applied to resulfurized steels with a high density of MnS and oxide inclusions. The results are compared to those obtained from surface observations.

The NbAl3 intermetallic compound was prepared two different ways:first, by the classical induction-melting technique; the end product is acoarse-grain massive compound, including cracks and pores. Second, bymechanically activated annealing process (M2AP); the end product is afine-grain, powder of submicron crystallites. The oxidation behavior in ai...

A study of the interactions between carbon and manganese impurities and yttrium has been performed during the oxidation of iron base specimens under an oxygen partial pressure of 0·04 Pa and at a temperature of 700°C. It was found that yttrium coated specimens always exhibit better oxidation behaviour than uncoated specimens. For a manganese contai...

Pure iron and various steel samples were yttrium implanted using the ion-implantation technique. Sample compositions and structures were investigated before and after yttrium implantation to determine the yttrium distributions and the main compounds formed after the ion implantation. Yttrium-implantation effects were characterized using analytical...

The mechanically activated self-propagating high-temperature synthesis (MASHS) technique was used to produce a NbAl3 intermetallic compound. This process results from the combination of two steps: a mechanical activation of the Nb+3Al powder mixture which is followed by a self-propagating high-temperature synthesis (SHS) reaction, induced by the ex...

The influence of yttrium introduced by ion implantation or by sol-gel coatings on the oxidation of pure iron has been studied at 973 K under p(O{sub 2}) = 0.04 Pa. The oxide scales were examined using a wide range of analytical techniques. The addition of yttrium by ion implantation or by sol-gel coatings significantly improved the oxidation resist...

Pure electrolytic iron samples were yttrium implanted using ion implantation method. Composition and structure studies were carried out before and after yttrium implantations by several analytical and structural techniques such as Rutherford backscattering spectrometry (RBS), secondary ion mass spectrometry (SIMS), reflection high energy electron d...

The mechanically activated self-propagating high-temperature synthesis (MASHS) technique and the mechanically activated annealing process (M2AP) were used to produce NbAl3 intermetallic compound. The MASHS process results from the combination of two steps: first, a mechanical activation of the Nb+3Al powders mixture; second, a self-propagating high...

Extra low carbon steel and pure electrolytic iron samples were yttrium implanted using ion implantation technique. Compositions and structures of pure iron and steel samples were investigated before and after yttrium implantation by several analytical and structural techniques (RBS, SIMS, RHEED and XRD) to observe the yttrium implantation depth pro...

Hydrogen promotes the decarburization of carbon containing alloys. However, our results show that manganese partially retains carbon in the substrate probably due to the formation of stable manganese containing carbides. The decarburization rate also depends upon the metallic structure : between 600 and 900°C, a two phase metal (ferrite + perlite o...

Pure electrolytic iron samples were implanted with yttrium using ion implantation technique. Compositions and structures of pure iron samples before and after yttrium implantations were investigated to determine the effect of ionic implantation. The aim of this paper is to show the correlation between composition and structural studies in order to...

Novel three dimensional (3D) gallium structures are presented by using commercial organometallics and conventional metal−organic vapour phase epitaxy system (MOVPE). These 3D structures grow up naturally on GaAs substrates and their shapes depend on the growth conditions and principally on the growth temperature. Introduction The (Ga, Al, In)N syst...