280 results on '"Epicier, Thierry"'
Search Results
2. Protocrystallinity of Monodispersed Ultrasmall Templated Mesoporous Silica Nanoparticles
3. Modeling the aging kinetics of zirconia ceramics
4. Deep learning detection of nanoparticles and multiple object tracking of their dynamic evolution during in situ ETEM studies
5. Protocrystallinity of Monodispersed Ultra-Small Templated Mesoporous Silica Nanoparticles.
6. Mechanical response of gasoline soot nanoparticles under compression: An in situ TEM study
7. Complex Precipitation Pathways in Multi-Component Alloys
8. Structural and magnetic properties of CoPt mixed clusters
9. An Approach in the Structural and Spectroscopic Analysis of Yb3+-Doped YAG Nano-ceramics by Conjugation of TEM-EDX and Optical Techniques
10. Preparation of Carbon‐Supported Tungsten Carbides: Comparative Determination of Surface Composition and Influence on Cellulose Transformation into Glycols
11. Pd Nanoparticles/Au@SiO2 Core–Shell Nanostructures for Hydrogen Sensing
12. Bifunctional organic/inorganic nanocomposites for energy harvesting, actuation and magnetic sensing applications
13. Networking strategies of the microscopy community for improved utilization of advanced instruments: (2) The national network for transmission electron microscopy and atom probe studies in France (METSA)
14. Environmental electron microscopy: materials in their real live in gas or liquid
15. Study of temperature and radiation induced microstructural changes in Xe-implanted UO2 by TEM, STEM, SIMS and positron spectroscopy
16. A machine Learning pipeline to track dynamics of a population of nanoparticles during in situ Environmental Transmission Electron Microscopy in gases
17. Internalization pathways into cancer cells of gadolinium-based radiosensitizing nanoparticles
18. Operando analysis of a Solid Oxide Fuel Cell in Environmental Transmission Electron Microscopy
19. Synthesis of nanoparticles (NPs) with well controlled characteristics is crucial to better understand the behaviour of the active phase during reaction and to better correlate it with its catalytic performance. Among other self-assembly methods, the di-block copolymer approach is well suited to obtain monodisperse supported NPs which can serve as supported metallic catalysts on both flat (model catalysts) and powder (realistic catalysts) supports. In this approach, an amphiphilic di-block copolymer dissolved in toluene yields a system of inverse micelles of which the core can be charged with metallic precursors to ultimately yield networks with well-controlled characteristics (size, composition, inter-distance). Important questions must be addressed, in particular in the case of bimetallic systems, concerning the formation of unique NPs at the cores from the initially pre-formed bimetallic seeds or the stability of the NPs networks with increasing temperature in presence of reactive gases. We have chosen to work with PS-b-P2VP di-block copolymer micelles that were functionalized with chloro-auric acid and palladium di-acetate precursors. The precursors selectively bind with N-functions in the P2VP cores to form (bi-)metallic seeds within the micelles’ cores as it was previously established in the case of PdAg alloys. We have used an Environmental TEM (Titan ETEM G2, FEI/TFS) operated at 300kV under gas pressures up to 20 mbar to gain insight on their evolution/stability during heating under oxygen and CO (for CO oxidation catalysis). Temperature variation was achieved with a WildFire sample holder with dedicated heating MEMS-microchips (DENS Solutions) capable of reaching temperatures up to 1300°C. Monolayers of controlled AuxPd1-x core-metallized PS-b-P2VP micellar solutions were deposited by spin-coating (2000/4000 rpm) on the microchips. Special care was taken to minimize/prevent any influence of the electron beam on the observed events.The Au-rich system (Au80Pd20) showed that, under oxygen, the (bi-)metallic seeds within the P2VP cores begin to sinter around 350° and unique NPs are eventually formed around 500°C which is consistent with the decomposition temperature range of the PS-b-P2VP copolymer associated with metallic nuclei. Further heating up shows that the NPs network is stable up to 900°C. Approaching the melting temperature of gold (1064°C) the NPs begin to shrink; concomitantly, smaller NPs (that grow even at 1100°C) form around the shrinking NPs. These smaller NPs are formed with Pd atoms from the initial bimetallic NPs.In the case of the Pd-rich system (Au20Pd80), under oxygen, the seeds begin to sinter around 300°C and at 450°C demixing of the NPs is observed leading to Janus NPs (Au-rich/PdO, cf. Figure); the latter are readily reduced and homogeneous NPs reform upon CO exposure (cf. Figure).The stability of the bimetallic NPs seems to be driven by the intrinsic properties of the metals composing them.Thanks are due to the METSA network for supporting this study and to CLYM for the access to the ETEM
20. Windowless wet Environmental TEM: a dedicated approach for water condensation / evaporation experiments
21. Pd Nanoparticles/Au@SiO2 Core–Shell Nanostructures for Hydrogen Sensing.
22. Integrated analysis of non-linear loss mechanisms in Yb:YAG ceramics for laser applications
23. Unifying natural and laboratory chemical weathering with interfacial dissolution–reprecipitation: A study based on the nanometer-scale chemistry of fluid–silicate interfaces
24. Morphology and topology assessment in hierarchical zeolite materials: adsorption hysteresis, scanning behavior, and domain theory
25. Polycrystalline Yb3+–Er3+-co-doped YAG: Fabrication, TEM-EDX characterization, spectroscopic properties, and comparison with the single crystal
26. Simulation of EDS Spectra Using X-RES Software
27. In-situ annealing transmission electron microscopy of plasmonic thin films composed of bimetallic Au–Ag nanoparticles dispersed in a TiO2 matrix
28. Formation of Bimetallic Nanoparticle Arrays and Evidence for their Stability at High Temperature under Gas Pressure in the Environmental TEM
29. Windowless in situ Water Condensation on NaCl nanocubes in Environmental TEM. - VIRTUEL
30. Formation of Bimetallic Nanoparticle Arrays and Evidence for their Stability at High Temperature under Gas Pressure in the Environmental TEM - VIRTUAL
31. Behaviour of macro-synthetic fibers reinforced concrete: Experimental, numerical and design code investigations
32. A Machine Learning pipeline to track the dynamics of a population of nanoparticles during in situ Environmental Transmission Electron Microscopy in gases
33. Synthesis and Characterization of Cubic Silicon Carbide (β-SiC) and Trigonal Silicon Nitride (α-Si3N4) Nanowires
34. An Approach in the Structural and Spectroscopic Analysis of Yb3+-Doped YAG Nano-ceramics by Conjugation of TEM-EDX and Optical Techniques
35. Very Fast Acquisition of Tilt series in Environmental TEM Tomography: Tips and Tricks
36. Correlative STEM-HAADF and STEM-EDX tomography for the 3D morphological and chemical analysis of semiconductor devices
37. 2D and Fast 3D in situ study of the calcination and reduction of Pd nanocatalysts supported on Alumina in Environmental Transmission Electron Microscopy (ETEM)
38. Interplay between local structure and magnetic properties of graded exchange-coupled Co@FePt nanocomposite films
39. Correlation of optical and photoluminescence properties in amorphous SiN x:H thin films deposited by PECVD or UVCVD
40. Synthesis and Characterization of Cubic Silicon Carbide (β-SiC) and Trigonal Silicon Nitride (α-Si3N4) Nanowires
41. Precipitation of Niobium Carbonitrides: Chemical Composition Measurements and Modeling
42. Highly ductile amorphous oxide at room temperature and high strain rate
43. Apports de la MET et de la microscopie électronique avancée environnementale à l'étude de nanoparticules (multi-)fonctionnelles
44. Characterisation of Niobium Carbide and Carbonitride Evolution within Ferrite: Contribution of Transmission Electron Microscopy and Advanced Associated Techniques
45. Vanadium Carbide Dissolution during Austenitisation of a Model Microalloyed FeCV Steel
46. Towards the Investigation of Thermal Properties of Nano-Objects in a Transmission Electron Microscope
47. Contribution of local analysis techniques for the characterization of iron and alloying elements in nitrides: consequences on the precipitation process in Fe–Si and Fe–Cr nitrided alloys
48. Silicon content in transparent YAG ceramics, analysis of the production process
49. Migration and Growth of Silver Nanoparticles in Zeolite Socony Mobil 5 (ZSM-5) Observed by Environmental Electron Microscopy: Implications for Heterogeneous Catalysis
50. Investigation of the Oxidation Reaction of LiFePO4 Cathode Material using Environmental TEM
Catalog
Books, media, physical & digital resources
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.