A5030910623- Ion-surface interactions and analysis
- Polymer Nanocomposite Synthesis and Irradiation
- Nanopore and Nanochannel Transport Studies
- Integrated Circuits and Semiconductor Failure Analysis
- Nuclear materials and radiation effects
- Fuel Cells and Related Materials
- Radiation Effects in Electronics
- Mass Spectrometry Techniques and Applications
- Glass properties and applications
- Microfluidic and Capillary Electrophoresis Applications
- Nuclear Physics and Applications
- Fusion materials and technologies
- Diamond and Carbon-based Materials Research
- High-pressure geophysics and materials
- Metal and Thin Film Mechanics
- Radioactive element chemistry and processing
- Semiconductor materials and devices
- X-ray Spectroscopy and Fluorescence Analysis
- Metallic Glasses and Amorphous Alloys
- Luminescence Properties of Advanced Materials
- Advanced biosensing and bioanalysis techniques
- GaN-based semiconductor devices and materials
- Astro and Planetary Science
- Electrostatics and Colloid Interactions
- Membrane-based Ion Separation Techniques
Centre de Recherche sur les Ions, les Matériaux et la Photonique
2014-2025
École Nationale Supérieure d'Ingénieurs de Caen
2013-2023
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2013-2023
Centre National de la Recherche Scientifique
2013-2023
Normandie Université
2020-2023
Centre de Calcul de l’Institut National de Physique Nucléaire et de Physique des Particules
2023
Université Claude Bernard Lyon 1
2023
Université de Caen Normandie
1989-2023
Institut de Physique
2023
Laboratoire Matériaux Optiques, Photonique et Systèmes
2015-2018
For the first time, latent tracks induced by swift Kr ions have been directly observed in mica. These are imaged atomic-force microscopy as hollows which associated with softer areas mica surface. The track core is formed disordered mean diameter of increases electronic stopping power ions. shape along ion path deduced from analysis both number per unit area and their distribution. observations images nanometric changes elastic properties.
The salinity gradient between brine and fresh water is an abundant source of power which can be harvested by two major membrane methods: pressure-retarded osmosis reversed electrodialysis. Nowadays, the latter technology close to real application, but it still suffers from low yield. Low selectivity complex fabrication are main limiting factors. To improve that, we design a couple ion-selective membranes based on track-etched polymer nanopore functionalized highly charged hydrogels. Two...
Abstract Poly(vinylidene difluoride) (PVDF) films were irradiated by means of heavy ions (in the electronic stopping‐power range) and electrons. Both types ionizing radiation induce in polymer film ionizations excitations, but swift a huge density excitations along ion path. Dose‐range goes from 0.3 to 40 MGy. Irradiations performed with Kr presence helium, hydrogen, deuterium, oxygen. Fourier transform infrared (FTIR) transmission measurements show differences nature created defects. Triple...
Amorphous metallic Fe85B15 alloy has been irradiated at low temperature with Ar, Kr and Xe ions of initial energies 1.8, 2.7 3.0 GeV, respectively. Electrical resistance was measured in situ on samples piled up along the beam direction. It is shown that above a given electronic stopping power threshold losses play crucial role radiation-induced damage.
Crystalline ${\mathrm{Ni}}_{3}$B ribbons have been irradiated at low temperature with GeV heavy ions (Kr,Xe,U) in order to study the disordering process induced this material by ion electronic energy loss. The atomic rearrangements produced irradiation were monitored situ via electrical resistance measurements and characterized after annealing room electron diffraction. results show a huge resistivity increase above an electronic-energy-loss threshold, which can be ascribed partial...
Thin platelets of LiF crystals have been bombarded on the side with Ne (40 MeV/amu), Ar (60 Kr (42 and Xe (27 MeV/amu) ions at room temperature in dose range from ${10}^{8}$ to ${10}^{13}$ ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}2}$. Taking into account large penetration depths these high-energy (\ensuremath{\simeq}1.4, 1.8, 0.6, 0.2 mm for Ne, Ar, Kr, Xe, respectively), it was possible measure depth distribution profiles primary point defects (F centers) aggregated (${\mathit{F}}_{2}$ using...
Deep inside dense molecular clouds and protostellar disks, interstellar ices are protected from stellar energetic UV photons. However, X-rays cosmic rays can penetrate these regions triggering chemical reactions, dissociation, evaporation processes. We present experimental studies of the interaction heavy, highly charged, ions (46 MeV <sup>58<sup/>Ni<sup>13+<sup/>) with ammonia-containing H<sub>2<sub/>O:NH<sub>3<sub/> (1:0.5) H<sub>2<sub/>O:NH<sub>3<sub/>:CO (1:0.6:0.4) in an attempt to...
The present study demonstrated the possibility to form a secondary system of parallel macropores in zeolite crystals. pore formation was predetermined by creation defect zones ZSM-5 A high energy (238)U ion beam employed latent tracks crystals, which were further subjected attack with diluted HF solution and thus developed uniformally sized macropores. selective extraction material from due higher etching velocity highly agitated created heavy bombardment. combination complementary methods...
We report the formation of a hybrid biological/artificial nanopore by direct insertion non-modified α-hemolysin at entrance high aspect ratio (length/diameter) biomimetic nanopore. In this robust system, protein exhibits same polynucleotide discrimination properties as in biological membrane and dwell time is strongly increased. This very promising for DNA sequencing applications where translocation velocity fragility support are main bottlenecks.
Here we propose a new approach to tailor nanopores, which combines both pH gating and sensing properties.
Fundamental understanding of ionic transport at the nanoscale is essential for developing biosensors based on nanopore technology and new generation high-performance nanofiltration membranes separation purification applications. We study here through single putatively neutral hydrophobic nanopores with high aspect ratio (of length L = 6 μm diameters ranging from 1 to 10 nm) a well controlled cylindrical geometry. develop detailed hybrid mesoscopic theoretical approach electrolyte...
Biological channels have served as inspiration to design stimuli-response artificial nanopores. Here we propose an original approach a pH-gate nanopore based on polyethylenimine and chondroitin-4-sulfate (ChS) layer-by-layer self-assembly. This is interesting because it rapid permits monitoring in real time of functionalization. The study ionic transport through these single nanopores reveals selectivity anions properties at low salt concentration. It open pH below 4 or 5 depending These are...
Amyloid fibrils are involved in several neurodegenerative diseases. However, because of their polymorphism and low concentration, they challenging to assess real-time with conventional techniques. Here, we present a new approach for the characterization intermediates: protofibrils "end-off" aggregates which produced during amyloid formation. To do so, have fashioned conical track-etched nanopores that functionalized prevent fouling. Using these nanopores, followed kinetic growth discriminate...
The electrical resistance of amorphous metallic Fe85B15 ribbons irradiated with 3 GeV Xe ions at different tilting angles respect to the incident ion beam has been measured in situ 77 K. results show that irradiation induces large sample growth due electronic-energy loss effects. existence a new mechanism leading damage creation alloys by electronic excitation alone is also demonstrated.