Materials Literature
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The capacitance–dc voltage relation has been investigated in the giant dielectric constant material CaCu3Ti4O12. A capacitance drop, rise and even maxima, minima have been found with increasing dc voltage, which could not simply be explained by the back-to-back Schottky barrier theory. A trap charges repositioning bet…
A general method for mapping the equipotential profile surrounding a conductive cylindrically symmetric high aspect ratio structure, such as a carbon nanotube or a Spindt tip, is devised. The surface of the object is replaced by a discrete set of charges located on the symmetry axis. The overall electrostatic potentia…
Multiferroic BiFeO3 (BFO) with the rhombohedral R3c symmetry is characterized by a clockwise-counterclockwise tilting (theta) of the FeO6 octahedron unit along the threefold pseudo-cubic [111](c) direction. A phase transition associated with the disappearance of theta is conceivable at a high temperature as thermal en…
Abstract An investigation on electronic and elastic properties of the ordered Si0.5Ge0.5 alloy under high pressure has been conducted using first‐principles calculations based on density functional theory (DFT) with the plane wave basis set as implemented in the CASTEP code. Our results demonstrate that the sequence o…
We have performed angle-resolved photoemission spectroscopy of layered cobalt oxide Na x CoO 2 for a wide doping range (0.35⩽ x ⩽0.85) with synchrotron radiation, and determined the doping dependence of the Fermi surface and band structure. The two-dimensional (2D) cylindrical a 1g Fermi surface at x =0.35 gradually i…
Abstract: This study reports on the influence of injection molding processing parameters on mechanical properties of oil palm Empty Fruit Bunch (EFB) filled High Density Poly Ethylene (HDPE). The biocomposite pellets were first prepared using an extruder with 20 wt% EFB content before being processed in an injection-m…
Carbon diffusion is observed in single crystal α-Al2 O3 substrates from carbon and Ti2AlC thin films synthesized via pulsed cathodic arc deposition. Diffusion was found to occur at substrate temperatures of 570 °C and above. The diffusion coefficient of carbon in α-Al2 O3 is estimated to be of the order 3×10-13 cm2/s…
Based on the nonlocal elastic theory and variational principle, new Timoshenko beam models and analytical solutions for buckling of carbon nanotubes considering nanoscale size effect and shear deformation are established. New equilibrium equations and higher-order boundary conditions are derived and the buckling behav…
Poly(melamine-urea-formaldehyde) microcapsules containing sulfur were prepared by in-situ polymerization. Several preparation parameters of microcapsules were investigated by analyzing the morphology, particle size and encapsulation efficiency. The morphologies indicated that sodium dodecyl sulfonate (SDS) was a suita…
The objectives of this study were to fabricate cross-linked biodegradable polycarbonate nanofibers and to investigate their biodegradability by different enzymes. Poly(2,3-dihydroxycarbonate) was synthesized from naturally occurring l-tartaric acid. The hydroxyl groups on the functional polycarbonate were converted to…
We have performed magnetization measurements of Gd5Ge4 with little or no ferromagnetic (FM) impurities under a pulsed magnetic field up to 40 T. The results reveal previously undetected transitions between 85 and 105 K, that is, a distinct second-order antiferromagnetic (AFM)-paramagnetic (PM) transition, followed by…
A new critical reflection on the anisotropic constraints of the ferromagnetic particles allow us to analytically describe the behavior of complex ferromagnetic systems. The anisotropic constraints of each individual ferromagnetic particle such as magneto-crystalline, shape, interface, defects, domain wall, or other in…
The energy relaxation of carriers in reduced graphene oxide thin films is studied using optical pump-probe spectroscopy with two probes of different colors. We measure the time difference between peaks of the carrier density at each probing energy by measuring a time-resolved differential transmission and find that th…
We describe a method for accurate calculation of the Relative Local Density of States (RLDOS) as a function of frequency and position in finite sets of coated cylinders. The RLDOS is important, since it describes the interaction between sources and their environment, which controls their ability to radiate electromagn…
An inverse four-domain twisted nematic (IFDTN) liquid crystal (LC) display was fabricated by enhancing the azimuthal anchoring energy of the alignment layers. By stacking a vertical alignment layer onto a planar alignment layer, we increased the azimuthal anchoring energy by approximately 17-fold times compared to tha…
Stärkeres magnetisches Moment mit weniger Elektronen: Der α-Keggin-Einzelmolekülmagnet {Mn13} wurde hergestellt und oxidiert (siehe Bild); die Ein- und Zwei-Elektronen-Oxidationsprodukte konnten isoliert werden. Die Spingrundzustände der stärker oxidierten Verbindungen liegen trotz des Elektronenverlustes höher, was z…
Room temperature ferromagnetic-like behavior in fullerene photopolymerized films treated with monatomic hydrogen is reported. The hydrogen treatment controllably varies the paramagnetic spin concentration and laser induced polymerization transforms the paramagnetic phase to a ferromagnetic-like one. Excess laser irrad…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation J. C. Woicik, C. K. Xie, B. O. Wells; Effect of strain on the local perovskite structure: La0.5Sr…
When solidifying molten silicon in contact with a foreign substrate, the interfacial interaction between silicon and the substrate material can affect the nucleation behavior and therefore the final grain structure. This work illuminates the nucleation properties of different materials using differential scanning calo…
Organic/inorganic hybrid polymer systems based on chitosan/silica have gained much importance due to their application in enzyme immobilization, sensors and as novel biomaterials. The present study involves the preparation, characterization and antimicrobial studies of chitosan/silica hybrid polymers incorporated with…