Materials Literature
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Superconductivity can be realized in Eu-containing pnictides by applying chemical (internal) and physical (external) pressure, the intrinsic physical mechanism of which attracts much attention in the studies of pnictide superconductors. Here we present the experimental evidence for the pressure-induced valence change…
A new soft and fast solid state reaction is exploited for the preparation of exchanged layered double hydroxide materials and, in particular, for intercalating bioactive molecules. The characterization of the nanocomposite, carried out by crystallographic and thermogravimetric techniques, revealed that this synthesis…
An in-situ TEM nanowelding process via Joule heating was used to achieve superstrong CNT-carbide-metal contacts, in which all shells of a multiwalled CNT contact the tungsten wire through the intermediate tungsten carbide layer. A remarkably high tensile strength (5–15GPa) and ultralow resistance(<1 kΩ) were documente…
The high level of accumulated expertise by ULIS and CEA/LETI on uncooled microbolometers made from amorphous silicon with 45μm, 35μm and 25μm, enables ULIS to develop VGA and XGA IRFPA formats with 17μm pixel-pitch to fulfill every applications. These detector keeps all the recent innovations developed on the 25μm pix…
We discuss the dynamical current-current correlation function of the hexagonal lattice using a local current operator defined on a continuum-replica model of the original lattice model. In the Dirac approximation, the correlation function can be decomposed into a parallel and perpendicular contribution. We show that t…
It is shown that an electric field applied to $p$-doped graphane generates a dissipationless orbital momentum Hall current. In the clean limit the corresponding Hall conductivity is independent of the concentration of holes. The Hall effect is related to the $2\ensuremath{\pi}$-Berry phase accumulated when heavy and l…
Densification and crystallization behaviors of nonstoichiometric cordierite synthesized from minerals through the glass route are reported in this paper. DTA of glass powder was conducted under isothermal and nonisothermal conditions. The activation energy was calculated from the dilatometry test at constant heating r…
ZnO films on nonseeded substrates with controllable microstructures and crystal orientations were fabricated with a spin-spray method employing trisodium citrate as an additive. The microstructure of the films was made to change from a rod array to a dense film by increasing the trisodium citrate concentration in the…
Isotactic polypropylene (iPP) fibers with diameters between 0.3 and 1.2 μm were successfully produced from high-temperature electrospinning solutions using a jacket-type heat exchanger to maintain the solution temperature, an infrared emitter to control the environmental temperature, and a laser heating device to heat…
Adsorption and desorption of atomic hydrogen on single-walled carbon nanotubes were observed by photoluminescence spectroscopy. A satellite peak appeared at the lower energy side of the E11 photoluminescence emission peak after exposure to atomic hydrogen and then disappeared after annealing at 300 °C in vacuum. The e…
The manipulation of the electron spin degree of freedom is at the core of the spintronics paradigm, which offers the perspective of reduced power consumption, enabled by the decoupling of information processing from net charge transfer. Spintronics also offers the possibility of devising hybrid devices able to perform…
Abstract Doped ceria and ceria based solid oxide solutions show a unique combination of oxygen ion mobility, electronic conductivity, and high catalytic activity for redox reactions. In this work, the minority conductivity of electrons has been measured directly as a function of the composition of ceria–praseodymia ba…
This paper reports a bottom-up solution-phase process for the preparation of pristine and heteroatom (boron, phosphorus, or nitrogen)-substituted carbon scaffolds that show good surface areas and enhanced hydrogen adsorption capacities and binding energies. The synthesis method involves heating chlorine-containing sma…
Wide band-gap oxide strontium titanate $({\text{SrTiO}}_{3})$ is highly recognized as potential thermoelectric material for its large Seebeck coefficient. Recently, several experimental studies emerged on how to improve the thermoelectric transport properties of ${\text{SrTiO}}_{3}$ by doping with La and Nb. To aid th…
The Raman and luminescence spectra of GdVO 4:Eu 3+ microcrystals have been measured in the pressure range from ambient pressure to 16.4 GPa at room temperature by using a diamond anvil cell. The discontinuities on Raman mode and luminescence intensity and the appearance of new Raman bands and luminescence peaks have p…
In this work, we present a performance analysis of field-effect transistors (FETs) based on recently fabricated 100% hydrogenated graphene (the so-called graphane) and theoretically predicted semihydrogenated graphene (i.e., graphone). The approach is based on accurate calculations of the energy bands by means of GW a…
Abstract The effect of water on the flow behavior of glass microspheres dispersed in mineral oil was investigated for various levels of water, particle volume fractions, and particle sizes. The addition of small amounts of water leads to large increases in viscosity due to the formation of water bridges between partic…
Molecular dynamics simulations are presented of coarse-grained, polar, polymer brushes in a good polar solvent at high grafting densities. Chain extension is heavily influenced by temperature, stretching far from the surface at high temperature (350 K) while weak absorption and loop formation is observed at low temper…
Abstract Multicomponent Ni7Co3 alloy–Au nanorings can be facilely synthesized at room temperature using metallic Ni7Co3 alloy nanorings as both reducing agent and sacrificial template in water. These novel alloy–Au hybrid nanorings are well biocompatible due to coating with poly(vinylpyrrolidone) and gold nanoparticle…
Abstract Here multi‐walled carbon nanotubes (MWNT) of different average diameters with ppm level purity were produced by a low temperature C2H4 pyrolysis on Fe‐Co type catalysts combined with forthcoming graphitization at 2200–2800 °C in argon flow. Annealed nanotubes were characterized with X‐ray fluorescent analysis…