Materials Literature
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The time evolution of the magnetization of a magnetic molecular crystal is obtained in an external time-dependent magnetic field, with sweep rates in the kT/s range. We present the 'exact numerical' solution of the time dependent Schrödinger equation, and show that the steps in the hysteresis curve can be described as…
The first-order reversal curve (FORC) method for analysis of systems undergoing hysteresis is applied to dynamical models of electrochemical adsorption. In this setting, the method can not only differentiate between discontinuous and continuous phase transitions, but can also quite accurately recover equilibrium behav…
Diffusion and clustering of lattice vacancies in silicon as a function of temperature, concentration, and interaction range are investigated by Kinetic Lattice Monte Carlo simulations. It is found that higher temperatures lead to larger clusters with shorter lifetimes on average, which grow by attracting free vacancie…
The one- and two-orbital double-exchange models for manganites are studied using Monte Carlo computational techniques in the presence of a robust electron-phonon coupling (but neglecting the antiferromagnetic exchange ${J}_{\mathrm{AF}}$ between the localized spins). The focus in this effort is on the analysis of char…
A modified seeded growth process has been used for the controlled synthesis of quasispherical, CTAB-stabilized gold nanoparticles from 12 up to 180 nm with narrow size distributions. The UV-visible spectra of the aqueous colloids show distinct bands corresponding to dipole and quadrupole plasmon modes, for diameters a…
Engineered materials composed of designed inclusions can exhibit exotic and unique electromagnetic properties not inherent in the individual constituent components. These artificially structured composites, known as metamaterials, have the potential to fill critical voids in the electromagnetic spectrum where material…
We report the fabrication of single-walled carbon nanotube (SWNT) DNA sensors and the sensing mechanism. The simple and generic protocol for label-free detection of DNA hybridization is demonstrated with random sequence 15mer and 30mer oligonucleotides. DNA hybridization on gold electrodes, instead of on SWNT sidewall…
Ordered gold (Au) mono- and bilayer structures have been synthesized on a highly reduced titania surface. The Au bilayer exhibits a significantly higher catalytic activity for carbon monoxide oxidation than does the Au monolayer structure. This is the first report of Au completely wetting an oxide surface and demonstr…
Nearly monodisperse hollow gold nanospheres (HGNs) with tunable interior and exterior diameters have been synthesized by sacrificial galvanic replacement of cobalt nanoparticles. It is possible to tune the peak of the surface plasmon band absorption between 550 and 820 nm by carefully controlling particle size and wal…
The Bi3.25La0.75Ti3O12 thin films with a buffer layer of Bi4Ti3O12 thin film are deposited on p-Si(100) substrates by Sol-Gel method. The P-E hysteresis loops and current-voltage curve of the Bi3.25La0.75Ti3O12/Bi4Ti3O12 film system are measured respectively. The results are performed and discussed.
The adoption of ferritic stainless steels for SOFC interconnects is still under intensive evaluation due to the unresolved issues of chromium poisoning, low electrical conductivity, and long-term instability of the oxide scales. Application of manganese-cobalt spinel protection layers on the steel interconnects may be…
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Natural-superlattice-structured Bi2MoO6−Bi4Ti3O12 (BM-BIT) (m = 1–3) thin films have been prepared on Pt/TiO2/SiO2/Si and SrTiO3 (001) single crystal substrates by pulsed laser deposition and show very good ferroelectric properties. The BM-BIT film seems to be almost single phase and its c-lattice constant is estimate…
Nonstoichiometric compositions of ceria were created by heat treatment at 800 C at various oxygen partial pressures. The different oxygen vacancy concentrations created by this heat treatment were conserved to room temperature by fast cooling. Nanoindentation technique was used to study the elastic modulus and hardnes…
Polycrystalline diamond coatings over 100 μm thick are produced on AlN ceramic substrates by microwave-plasma CVD from a CH 4 -H 2 -O 2 mixture. Their Raman spectra indicate good phase purity and a compressive stress as high as about 4 GPa due to the thermal-expansion mismatch between the diamond and the ceramic. Meas…
The crystallization behavior and crystal morphology of the poly(trimethyl terephthalate) (PTT)/poly(butylene terephthalate) (PBT) blends were investigated by means of differential scanning calorimetry (DSC), wide angle X‐ray diffraction (WAXD) and polarized light microscopy (PLM) techniques. It was found that the two…
Austenite stainless steel 349TM has been tested in a simulated polymer electrolyte membrane fuel cell (PEMFC) cathode environment, and a stable passive film was formed within 15 minutes of polarization. X-ray photoelectron spectroscopy (XPS) has been utilized to investigate these surface films on the steel. The surfac…
A newly synthesized aromatic polyaminocarboxylate (NBD-ABEDTA, H(4)L) was applied to precapillary derivatizing capillary electrophoresis as a chelating reagent for lanthanide ions (Ln(3+)). The Ln-L complexes provide both kinetic stability on dissociation due to their methyl-EDTA coordinating structure, and high light…
Nd-doped bismuth titanate, Bi4-xNdxTi3O12 (x = 0.75 ∼ 0.90) ceramics, was prepared by the solid state reaction method, and the effects of Nd doping on dielectric and ferroelectric properties were investigated. With increasing Nd content, the Curie temperature decreased and the dielectric constant peak broadened. In ad…
We propose a scheme for realizing negative refractive index in a four-level atomic system. It is shown that such a system can simultaneously exhibit negative permittivity and negative permeability in an optical frequency range. Furthermore, by analysing the dispersion property of the left-handed material, we find that…