Materials Literature
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Although shape-memory metal alloys have wide use in medicine and other areas, improved properties, particularly easy shaping, high shape stability, and adjustable transition temperature, are realizable only by polymer systems. In this paper, a polymer system of shape-memory polymer networks based on oligo(epsilon-capr…
Nanoparticles of 1-phenyl-3-((dimethylamino)styryl)-5-((dimethylamino)phenyl)-2-pyrazoline (PDDP) ranging from tens to hundreds of nanometers were prepared by using the reprecipitation method. Their excitonic transitions responsible for absorption and emission, as compared with those of dilute solution, have been inve…
BACKGROUND: Based on the observation that ultrasmall superparamagnetic particles of iron oxides (USPIOs) are phagocytosed by cells of the mononuclear phagocytic system, the purpose of this study was to evaluate their use as a marker of atherosclerosis-associated inflammatory changes in the vessel wall before luminal n…
By introducing benzoyl–benzene into a cholesteric liquid crystal, the helix unwinding voltage was reduced. This reduction was roughly proportional to the concentration of the dopant and was present for driving frequencies across the audio spectrum. It is believed that this voltage reduction is primarily due to a pertu…
Amorphous TiO 2 thin films and ZnFe 2 O 4 -doped TiO 2 composite films were deposited by radio frequency magnetron sputtering. The effect of ZnFe 2 O 4 doping on the optical properties of TiO 2 thin films was reported. Our results show that the absorption edge of TiO 2 thin films and composite films exhibits a blueshi…
Ni/γ-Al2O3 catalysts show high catalytic activity for the selective catalytic reduction of NO by C3H6. The microstructures of nickel species were characterized by the spectroscopy of X-ray Absorption Near Edge Structures (XANES) and Extended X-ray Absorption Fine Structures (EXAFS). The results of XANES and EXAFS indi…
A Landau–Ginsburg–Devonshire-type thermodynamic theory is used to describe epitaxial ferroelectric films with dense laminar domain structures, where spontaneous polarizations in both domains are oriented in the film plane. For PbTiO3 films, it is found that, at positive misfit strains, the domain patterning transforms…
Using an oblique-incidence optical reflectivity difference technique, we investigated kinetic processes in SrTiO3 homoepitaxy on SrTiO3(001) under pulsed-laser deposition conditions. Depending upon growth temperature and oxygen ambient pressure, we found that the oxidation of an as-grown SrTiO3 monolayer may take a mu…
We find that a system of particles interacting through a simple isotropic potential with a softened core is able to exhibit a rich phase behavior including: a liquid-liquid transition in the supercooled phase, as has been suggested for water, a gas-liquid-liquid triple point, a freezing line with anomalous reentrant b…
Structural, transport, and magnetic measurements on the system ${\mathrm{Sr}}_{2}{\mathrm{FeMo}}_{1\ensuremath{-}x}{\mathrm{W}}_{x}{\mathrm{O}}_{6}$ $(0<~x<~1)$ have been used to monitor the transition from itinerant-electron ferromagnetism in ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ to localized-electron antifer…
The low-temperature phase coexistence of size-asymmetric primitive model electrolyte solutions has been investigated by means of Monte Carlo simulations. A multidimensional parallel tempering method is employed and results are analyzed by means of histogram reweighting. Coexistence curves and critical constants are de…
We calculate the optical conductivity of one-dimensional Mott insulators at low energies using a field theory description. The square root singularity at the optical gap, characteristic of band insulators, is generally absent and appears only at the Luther-Emery point. We also show that only few particle processes con…
The electronic and structural properties of two different edge terminations in normal graphite layer edges were investigated at atomic resolution using scanning tunneling microscopy (STM) and electronic band structure calculations. An emphasis is placed on distinguishing the electronic structure of [1,1,2̄,0] (“armcha…
The influence of the film–electrode interface on the ac-electric field dependence of the dielectric permittivity in ferroelectric thin-film heterostructures has been studied. The dielectric nonlinearities in epitaxial thin-film heterostructures of ferroelectric PbZr0.65Ti0.35O3 and relaxor ferroelectric (PbMg1/3Nb2/3O…
New tetragonal phases of crystalline carbon nitride (CN) and their atomic structures have been identified using a self-consistent-charge density-functional tight-binding method. A tetragonal rocksalt structure provides theoretical support to recent experimental evidence for a stoichiometric CN phase with tetragonal sy…
LaFe 0.5 Mn 0.5 O 3 solid solution films have been formed on SrTiO3 (111) substrates using a pulsed laser deposition technique and their magnetic properties have been examined. The films showed ferromagnetic (or ferromagnetic) behavior with a Curie temperature of 380 K and the saturation magnetization was estimated to…
Kapton polyimide is known for its high thermal stability, >400 °C. Copper sulfide thin films of 75 and 100 nm thickness were coated on DuPont Kapton HN polyimide foils of 25 µm thickness by floating them on a chemical bath containing copper complexes and thiourea. The coated foils were annealed at 150-400 °C in nitrog…
${\mathrm{CrO}}_{2}$ cold-pressed powder compacts show different electronic transport property than the single crystals. We have analyzed the temperature dependence of the conductance and magnetoresistance (MR) of cold-pressed compacts of ${\mathrm{CrO}}_{2}$ powders. Our results show that there exist two channels of…
Experimental measurements are presented of the hole mobilities of four conjugated discotic systems, forming columnar liquid crystals, as a function of temperature. The measurements cover the crystalline/glassy phase and mesophase of these materials. It is a remarkable fact that the mobility is almost independent of te…
We present a first-principles study of the structure and quantum electronic conductance of junctions consisting of two crossed (5,5) single-walled carbon nanotubes. The structures are determined by constrained minimization of total energy at a given force between the two tubes, simulating the effects of substrate-tube…