Materials Literature
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We have studied friction and dissipation in single and bilayer graphene films grown epitaxially on SiC. The friction on SiC is greatly reduced by a single layer of graphene and reduced by another factor of 2 on bilayer graphene. The friction contrast between single and bilayer graphene arises from a dramatic differenc…
Weak-coupling approaches to the pairing problem in the iron pnictide superconductors have predicted a wide variety of superconducting ground states. We argue here that this is due both to the inadequacy of certain approximations to the effective low-energy band structure, and to the natural near degeneracy of differen…
The concept of antennas has found renewed interest in near-field optics and the optics of nanometer-structured systems where dimensions are significantly smaller than the wavelength λ. Optical antennas usually consist of a combination of dielectric and metallic materials. Similar concepts are increasingly studied for…
Motional eddy currents are induced in conductors due to a localized vrarrtimesBrarrelectric field. Direct modeling of this term by finite-element-based analysis may lead to nonphysical oscillations. In this paper, two modified magnetic equivalent circuit (MEC) methods to calculate motional eddy currents in highly satu…
We have studied carrier dynamics in In(2)O(3) nanocrystals grown on a quartz substrate using chemical vapor deposition. Transient differential absorption measurements have been employed to investigate the relaxation dynamics of photo-generated carriers in In(2)O(3) nanocrystals. Intensity measurements reveal that Auge…
A rigorous integral equation formulation in conjunction with Green's function theory is used to analyze the scattering phenomena by a periodic dielectric grating slab waveguide. Such a structure is mainly utilized to obtain a frequency selective surface, finding applications both in the microwave and the optical regio…
Upon excitation at 796 nm, Nd(3+)-doped BaCl(2) single crystals show several upconverted fluorescence bands in the visible spectral range, with the most intense bands at 530, 590 and 660 nm, in addition to the typical fluorescence bands in the infrared spectral range. The power dependence of the infrared fluorescence…
Abstract Blends of poly(butadiene‐ co ‐acrylonitrile)‐polyaniline dodecylbenzenesulfonate [NBR‐PAni.DBSA] were successfully prepared using an internal mixer for the first time. Electrical conductivities of all the vulcanized blends (up to 10 −2 S/cm with a conductivity percolation threshold 6.0 wt %/5.4 vol % of PAni.…
The zeroth-order resonant (ZOR) properties of the left-handed material (LHM) unit cells composed of complementary split ring resonators and series gaps are analysed. The method to determine the resonant frequency and susceptance slope parameter is proposed. A bandpass filter (BPF) is designed by connecting the ZORs wi…
Charge transport is studied in conducting composites of polyaniline and cis-1,4-polyisoprene (rubber). Films of different compositions are prepared by the solution route that are easily compressible under low pressure. Electrical conductivity is measured across the film thickness with the applied pressure. The results…
Monte Carlo simulations of cation doping within the ZnO lattice were utilized to evaluate dopant distributions in nanoparticles and thin films. In structures with a high surface-to-volume ratio, dopant distributions deviate significantly from predictions based on probabilistic expressions for infinitely large bulk lat…
The peaks in the reflectivity spectrum of waveguide gratings observed when the incident beam couples to a mode of the structure are promising features for many applications. However their weak angular tolerance and their strong polarization sensitivity, especially under oblique incidence, limit their interest in pract…
In this paper, a two-stage modelling, to ensure a good and fast optimization procedure for microdevices, is presented. This methodology is supported by three noncommercial software. The first one is dedicated to analytical modelling of non ferromagnetic electromagnetic devices, the second one is dedicated to numerical…
Two isotropic vector stop models are compared. One is a superposition of scalar stop models and the other uses a geometrically vectorized stop hysteron. Their simulated rotational hysteresis losses are adjusted to a measured loss. The latter adjusted vector stop model accurately represents the rotational hysteretic pr…
This paper presents an identification procedure for a phenomenological vector hysteresis model, called the Della Torre, Pinzaglia and Cardelli Model, introduced as a general hysteresis vector model for magnetic materials. The identification of the distribution function is approached by using the classical deterministi…
By performing nonequilibrium molecular-dynamics simulations, we found that carbon nanotubes act as phonon waveguides, retaining their excellent thermal conductance even when they are severely bent. We also show that thermal conductance is reduced dramatically when the outer shells of a multi-walled nanotube are partia…
Abstract The syntheses of two perdeuterated ionic liquids (ILs), which have found use as solvents for cellulose derivatization and processing in addition, are described: 1‐ethyl‐3‐methylimidazolium acetate (EMIM‐OAc‐d 14 ) and 1‐butyl–3‐methylimidazolium acetate (BMIM‐OAc‐d 18 ). The targets were obtained from imidazo…
In this study, two biodegradable polymers, poly(trimethylene carbonate) (PTMC) and poly(L-lactide) (PLLA) along with a series of PTMC/PLLA blends, were used as spreading materials to form LB monolayers at the air/water interface to study hydrolytic reaction kinetics of the monolayers with the Langmuir film balance tec…
A novel technique was proposed for evaluating a local heat source in film power capacitors by adopting a minimized analysis model. It is impossible to analyze directly the distributions of heat source in a capacitor element because of tiny scale of aluminum foil and polypropylene film compared to the length of capacit…
We present here a detailed investigation on the structural and magnetic transformations in the Ni 50 Mn 50− x Sb x Heusler alloys with composition x = 12, 13 and 14. The evolution of martensitic to austenitic transformation has been investigated using temperature dependent x-ray diffraction study. A wide region of pha…