A5069014261- Nonlinear Optical Materials Studies
- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Organic Light-Emitting Diodes Research
- Photochromic and Fluorescence Chemistry
- Microfluidic and Bio-sensing Technologies
- Luminescence and Fluorescent Materials
- Micro and Nano Robotics
- Nanofabrication and Lithography Techniques
- Gold and Silver Nanoparticles Synthesis and Applications
- Nonlinear Optical Materials Research
- Advanced Sensor and Energy Harvesting Materials
- Underwater Acoustics Research
- Porphyrin and Phthalocyanine Chemistry
- Connective tissue disorders research
- Laser Material Processing Techniques
- Surface Modification and Superhydrophobicity
- Acoustic Wave Phenomena Research
- Analytical Chemistry and Sensors
- Optical Coatings and Gratings
- 3D Printing in Biomedical Research
- Polyoxometalates: Synthesis and Applications
- Metamaterials and Metasurfaces Applications
- Plasmonic and Surface Plasmon Research
- Molecular Communication and Nanonetworks
Laboratoire Interdisciplinaire de Physique
2012-2024
Centre National de la Recherche Scientifique
2013-2024
Université Grenoble Alpes
2012-2024
Institut polytechnique de Grenoble
2020
Université Paris-Sud
1999-2019
Laboratoire de physique des Solides
2003-2016
Laboratoire de Spectrométrie Ionique et Moléculaire
2003-2012
Université Joseph Fourier
2001-2011
Université Nangui Abrogoua
2010
Solvay (Belgium)
2008
We have studied the nonlinear absorption spectra and optical limiting properties of 2,2′-(9,9-dihexyl) bifluorene. Measurements were done in chloroform solution, visible range (450–650 nm), for nanosecond time-duration pulses. The two-photon (TPA) spectrum, obtained by up-conversion fluorescence method, shows a resonance at λ=534 nm with cross-section σTPA=60 10−50 cm4⋅s/photon-molecule. Semiempirical quantum chemistry calculation on fluorene bifluorene suggests an enhancement TPA due to...
A new microfabrication technique creates bubble-based acoustic swimmers at the 10-\textmu{}m scale---the size of a red blood cell. The authors use experiments and three-dimensional analytical model to analyze efficient propulsion mechanism these artificial microswimmers. Such active matter could be used transport payload within bloodstream, or mix fluids in lab-on-chip device.
Abstract The goal of this study is to engineer 3D‐microswimmers containing a bubble that can be stimulated and guided with acoustic waves emitted by transducers. By using 3D‐microfabrication techniques, 20 × 26 µm swimmers are designed trapped air pointing toward the substrate, thus mimicking hovercraft. Acoustic vibrations then remotely applied bubble, which generates strong steady flow (0.1–2 mm s −1 ), an effect referred as streaming, resulting in jet below It found motion swimmer relies...
Bubble-based acoustic propulsors are fabricated with 3D micro-printing. They generate collective flows used for fast and efficient mixing in microchannels.
Immediate care of skin wounds and burns is essential to repair this mechanical chemical barrier infections.
We have synthesized and characterized a new fluorene copolymer exhibiting bright yellow luminescence. In order to ensure complete π-stacking of the active layer, 9-fluorenone monomeric unit (FOne) has been used as comonomer in conjunction with more classical 9,9-di-n-nonylfluorene unit. As expected fluorene-based materials, when excited at 370 nm, corresponding dilute solution photoluminescence spectra exhibit main peak centered 450 nm blue part visible spectrum. However, solid state,...
The device performances of light-emitting electrochemical cells are improved by adding a room-temperature molten salt (tetrahexylammonium-bis-trifluoro-methyl-sulfonyl imide) directly into the layer. For poly(9,9-dihexyl-fluorene-2,7-diyl) with an indium-tin-oxide anode and aluminum cathode, power efficiency can be increased more than one order magnitude. An even pronounced effect is observed for poly [2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylenevinylene]. Equally important both luminescent...
Well-defined fluorene oligomers (n = 1 to 6) were prepared step by using Suzuki and Yamamoto couplings, while absorption photoluminescence properties evidenced very large dipolar coupling interactions between moieties.
Abstract Two‐photon polymerization (2PP) allows precise 3D printing at the micrometer scale, and by associating it with magnetic materials, creation of remotely actuatable micro‐structures. Such structures attract a growing interest for biomedical applications, thanks to their size biocompatibility some photoresist materials. Gelatin methacryloyl (Gel‐MA) is one such material, can be used create physiological scaffolds cell culture. Here, physico‐chemical properties two resins are exploited,...
Electron-energy-loss spectroscopy acquired with a subnanometer probe is used to record electron excitation spectra in nanometer-scale layered structure. When applied measure band gap energies $\mathrm{Hf}{\mathrm{O}}_{2}$ layer, we demonstrate that the desired local information obscured by delocalized contributions from interface plasmons, interband transitions, and \ifmmode \check{C}\else \v{C}\fi{}erenkov radiation. Simulations performed within relativistic dielectric formalism,...
Gold microstructures are produced with a femtosecond laser in thin films of polystyrene sulfonate matrix containing gold ions. Two-photon induced metal reduction is obtained by addition 0.1wt% ruthenium(II)tris(bipyridine) the formulation. Laser power reduced to 5mW, thereby limiting thermal effects. Lines typically 150nm heights and 1μm widths fabricated as well freestanding bidimensional structures. An additional electroless plating step produces structures conductivities only ten times...
Cationic polyfluorene colloids are prepared and adsorbed on cellulose to obtain fibers paper sheets with high photoluminescence (see figure). The oxidative pretreatment of allows the tailoring fiber uptake capacity final intensity. Paper sheet strength is not affected by adsorption a sufficient amount colloid.
Silver nanoparticles and silver nanowires have been grown inside mesostructured silica films obtained from block copolymers using two successive reduction steps: the first one involves a sodium borohydride or photoreduction of nitrate contained in film, second consists deposit on primary nanoparticles, carried out by ion solution with hydroxylamine chloride. We demonstrated that F127 copolymer ((PEO)(106)(PPO)(70)(PEO)(106)), "F type", film is suitable "soft" template for fabrication...