Materials Literature
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The microstructure, transformation temperatures, basic tensile properties, shape memory behavior, and work output for two (Ni,Ti)Pt high-temperature shape memory alloys have been characterized. One was a Ni<sub>30</sub>Pt<sub>20</sub>Ti<sub>50</sub> alloy (referred to as 20Pt) with transformation temperatures above 23…
Abstract Polymorphic crystals and complex multiple melting behavior in an aliphatic biodegradable polyester, poly(butylene adipate) (PBA), were thoroughly examined by wide‐angle X‐ray diffraction (WAXD) and differential scanning calorimetry (DSC). Further clarification on mechanisms of multiple melting peaks related t…
Abstract Lung cancer is usually fatal once it becomes metastatic. However, in order to develop metastases, a tumor usually invades the basal membrane and enters the vascular or lymphatic system. In this study, a three‐dimensional artificial membrane using collagen type I, one of the main components of basal membranes,…
Abstract Cellulose nonwoven mats of submicron‐sized fibers (150 nm–500 nm in diameter) were obtained by electrospinning cellulose solutions. A solvent system based on lithium chloride (LiCl) and N, N ‐dimethylacetamide (DMAc) was used, and the effects of (i) temperature of the collector, (ii) type of collector (alumin…
The equilibrium sizes of micro- and nano-domains caused by electric field of atomic force microscope tip in ferroelectric semiconductor crystals have been calculated. The domain was considered as a prolate semi-ellipsoid with rather thin domain walls. For the first time we modified the Landauer model allowing for semi…
The effect of purification on room temperature electronic transport properties of single-wall carbon nanotubes (SWNT) was studied by submerging samples into liquid mercury. The conductance plots of purified SWNTs showed plateaus, indicating weak dependence of the electrical resistance on the length of the tube connect…
The problem of importance of strong correlations for the electronic structure, transport, and magnetic properties of half-metallic ferromagnetic ${\mathrm{CrO}}_{2}$ is addressed by performing density functional electronic structure calculations in the local spin density approximation (LSDA) as well as using the LSDA+…
The contribution to the low frequency internal friction and the thermal conductivity due to optically vibrating edge dislocation dipoles is calculated within the modified Granato-Lucke string model. The results are compared with the recent experiments on plastically deformed samples of Al, Ta and Nb at low temperature…
We report a simple theoretical derivation of the spectrum and damping of spin waves in a cylindrical periodically structured magnetic nanowire (cylindrical magnonic crystal) in the "effective medium" approximation. The dependence of the "effective" magnetic parameters upon the individual layer parameters is shown to b…
The electronic properties of multi-wall carbon nanotubes (MWNTs) have attracted much attention because they could lead to nano-sized electronic devices. Using chemical vapor deposition (CVD), MWNTs are produced in large quantities at a low cost. CVD-produced MWNTs, however, generally contain a considerable amount of s…
Thin films of cadmium stannate was prepared using low cost cadmium acetate and tin (II) chloride precursors by spray pyrolysis technique at three different substrate temperatures of 400, 450 and 5000 C. A novel procedure of simultaneously forming additional layer, introduced for the first time in this work, on the alr…
The static configuration of ferroelectric domain walls was investigated using atomic force microscopy on epitaxial PbZr(0.2)Ti(0.8)O(3) thin films. Measurements of domain wall roughness reveal a power-law growth of the correlation function of relative displacements B(L) alpha L(2zeta) with zeta approximately 0.26 at s…
The crystal structure and electronic and magnetic properties of magnetic molecular conductor (EDTDM) 2 FeBr 4 are investigated. The material undergoes a SDW transition at T MI ∼11 K and an antiferromagnetic transition of Fe 3+ d -spins at T N =3 K. In addition to the appearance of an anomaly in the resistivity around…
Resistivity, thermopower and Hall coefficient have been systematically measured for polycrystalline samples of (Bi 1- x Pb x ) 1.8 Ba 2 Rh 1.9 O y . An upturn of the resistivity and the Hall coefficient below 50 K is ascribed to decrease in the density of states due to a pseudogap formation. The thermopower and Hall c…
The electrical resistivity ρ and thermopower S of Heusler compounds Fe 3- x V x Al have been measured at the temperature range from 1.5 to 300 K at magnetic fields up to 15 T. The measurements of ρ and S in the high temperature range up to 800 K have been performed. ρ and S show a semiconducting behavior at high tempe…
Using homogenization theory, we derive the effective permittivity and permeability of a wire-mesh photonic crystal from first principles. We show that this structure does not lead to a left-handed medium when it is embedded in a matrix with a negative mu, but that resonators in a medium with a negative epsilon do form…
We have investigated the resistivity of an organic Mott insulator, β'-(BEDT-TTF) 2 AuCl 2 , under extremely high pressures of up to 9.9 GPa, using the cubic anvil press, motivated by the fact that a related material, β'-(BEDT-TTF) 2 ICl 2 , shows the highest transition-temperature superconductivity among organics at 8…
The magnetoelectric effect in millimeter size PMN-PT∕Terfenol-D composites is known. In an effort towards miniaturization, we report on the magnetoelectric effect in micrometer-size sputtered composites. Multilayers of TbFe∕FeCo with a thickness of 4μm were sputter deposited on both sides of PMN-PT piezoelectric singl…
Microscopy experiments are employed to characterize the elastic interactions of magnetic nickel nanowires suspended in a nematic liquid crystal. The nematic imposes a torque on an isolated wire that increases linearly with the angle between the wire and the nematic director in a manner quantitatively consistent with p…
Nanowires of the Fe–Ga alloy system, Fe1−xGax (0.1⩽x⩽0.25at.%), were fabricated using electrochemical deposition into nanoporous anodic alumina. Fe–Ga alloys are magnetically soft, mechanically robust, ductile, and have large magnetostriction. High aspect ratio nanowires with varying diameters and lengths were fabrica…