Materials Literature
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Dealloying (selective dissolution) of homogeneous metallic alloys such as Ag–Au generates nanoporous metals with intriguing properties. Until now, it has not been possible routinely to prepare such materials in a form in which they would resist mechanical strains, such as might be encountered in applications as membra…
Abstract Nylon‐6,6 nanofibers were electrospun at an elongation rate of the order of 1000 s −1 and a cross‐sectional area reduction of the order of 0.33 × 10 5 . The influence of these process peculiarities on the intrinsic structure and mechanical properties of the electrospun nanofibers is studied in the present wor…
An expression for the electromagnetic field energy density in a dispersive lossy left-handed metamaterial, consisting of an array of split-ring resonators and an array of wires, is derived. An electromagnetic field with general time dependence is considered. The outcome is compared with previously published results. I…
Mats of PVA nanofibres were successfully prepared by the electrospinning process and were developed as carriers of drugs for a transdermal drug delivery system. Four types of non-steroidal anti-inflammatory drug with varying water solubility property, i.e. sodium salicylate (freely soluble in water), diclofenac sodium…
A process is described to produce single sheets of functionalized graphene through thermal exfoliation of graphite oxide. The process yields a wrinkled sheet structure resulting from reaction sites involved in oxidation and reduction processes. The topological features of single sheets, as measured by atomic force mic…
The E′ δ center is one of the most important paramagnetic point defects in amorphous silicon dioxide ( a-SiO 2 ) primarily for applications in the field of electronics. In fact, its appearance in the gate oxide of metal-oxide-semiconductor (MOS) structures seriously affects the proper work of many devices and, often,…
Abstract Summary: The SDSD of binary mixture with short‐range potential is numerically simulated in 3D by cell dynamic system (CDSs), focusing on the phase morphology and dynamics in the parallel cross‐sections. The formation mechanism and growth law of the wetting layer are analyzed taking thermal noise effects into…
Strain development in a single phase polycrystalline B2 RuAl alloy has been studied at the local microstructural scale via a high-resolution surface displacement mapping technique. Significant heterogeneity of straining is observed within individual grains and among neighbouring grains. Strains accumulated in a self-s…
Polypropylene (PP) was reinforced with polystyrene-grafted nanosilica particles. A detailed study on the microstructure of untreated and treated nano-SiO2-particle–reinforced polypropylene composites has been made by using Atomic Force Microscopy (AFM) and Transmission Electron Microscopy (TEM). The observations were…
The physical and mechanical properties of Polypropylene (PP) and Fe-PP polymer composites containing 5, 10, and 15 vol% Fe were investigated experimentally. After preparing PP and Fe–PP polymer composites with a twin screw extruder and injection molding, the following properties were determined: yield and tensile stre…
Success in measuring transverse sound velocity allowed us to determine, for the first time, all six elastic constants of a protein crystal. An ultrasonic pulse-echo method was used to perform sound velocity measurements on tetragonal hen egg-white (HEW) lysozyme crystals that were partially dehydrated at 42% relative…
The magnetotransport behaviors of a series of rare earth manganites with the same A-site cational mean radius and different A-site ionic radii variance (A-site disorder) are investigated. It is found that the system’s ground state transforms from ferromagnetic metal to cluster-glass insulator with increasing A-site di…
Amorphous As2S8 chalcogenide glass is shown to undergo changes in the refractive index upon exposure to ultraviolet light. This phenomenon is employed to fabricate an As2S8 stripe waveguide, which is shown to be an effective guided mode device with a useful switching functionality based on the photo-optical effect.
The dielectric permittivity of Bi7−xLaxTi4NbO21 (x=0–1.75) ceramics at ambient temperature is stable in a wide range of frequencies and can be modulated from 150 to 320 by compositional modification. With increasing La3+ content, both the phase transition temperatures downshift and the phase transition peaks become di…
The goal of this work was to compare the behaviour of a chemical vapour deposited (CVD) diamond sample, grown at the University of Florence using a local procedure, with that of a commercial CVD diamond. The comparison was performed exposing both systems to 25 MV photons and measuring the current response during irrad…
A time-resolved reflection pump-probe method was combined with a surface plasmon resonance technique in Kretschmann geometry for the investigation of ultrafast light-induced processes in thin films. Transient changes in the gold layer's reflectivity were observed when the layer was excited by 3 ps duration pulses with…
Abstract The solvent‐free melt reactions of benzotriazole (BtzH, C 6 H 4 N 2 NH) with rare earth metals result in three different types of benzotriazolate coordination polymers. Early 4f metals yield ∞ 1 [Ln(Btz) 3 (BtzH)] [Ln = Ce ( 1 ), Pr ( 2 )], from neodymium to ytterbium the type ∞ 1 [Ln(Btz) 3 {Ph(NH 2 ) 2 }] i…
The influence of Sn doping in In2O3 thin films on conductance, transmission, and granular structure has been studied. By careful control of the pulsed-laser deposition parameters, films with high optical transmittance (>85%) and low resistivity (ρ=4.1×10−4Ωcm) are grown at room temperature on polyethylene terep…
Dynamic clustering associated with self-assembly in many complex fluids can qualitatively alter the shape of phase boundaries and produce large changes in the scale of critical fluctuations that are difficult to comprehend within the existing framework of theories of critical phenomena for nonassociating fluids. In or…
Population dynamics of ${\mathrm{Ho}}^{3+}$: $^{5}\mathrm{I}_{5}$ levels doped in chalcohalide glasses were investigated through the analysis of energy transfer processes. Excitation migration $(^{5}\mathrm{I}_{5},^{5}\mathrm{I}_{8}\ensuremath{\rightarrow}^{5}\mathrm{I}_{8},^{5}\mathrm{I}_{5})$ predicted from the Dext…