Materials Literature
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The phase transitions of a Ge2Sb2Te5 cell with a volume of 20×20×0.1μm3 were carried out by applying a reset pulse (10V and 50ns) and a subsequent set pulse (5V and 300ns) using a homemade W heater tip fabricated by focused ion beam lithography. The phase transformation from a crystalline state to an amorphous state w…
Plastic deformation reduces the local stress concentration and changes the interface coherency in a coherent microstructure. Therefore, it may affect the morphology and evolution kinetics of a microstructure. In this work, a very efficient method has been proposed to obtain the elastic-plastic solution in an elastical…
The authors demonstrate herein that by lowering of a growth temperature they can obtain ZnMnO layers with homogeneous Mn distribution, which are free of Mn accumulations and inclusions of foreign phases due to other Mn oxides. These layers (with low Mn content fractions) show paramagnetic phase in room temperature mag…
Abstract D , L ‐Lactide with a yield of about 36% was synthesized from D , L ‐lactic acid by the addition of SnCl 2 and Cat‐A as catalyst under continuous microwave irradiation in less than 1 h. In order to gain a higher yield, the viscosity‐average molecular weight of the oligomer was preferably over 3 000 g · mol −1…
A ferroelectriclike hysteresis loop was obtained at room temperature for CaCu3Ti4O12 (CCTO) ceramic. The remnant polarization and coercive field for 1100°C∕5h sintered CaCu3Ti4O12 ceramics were 0.063μC∕cm2 and 195V∕cm, respectively. Remnant polarization increased while the coercive field decreased with increase in sin…
The Pb(Zr1−xTix)O3 multilayered films consisting of Pb(Zr0.8Ti0.2)O3 and Pb(Zr0.2Ti0.8)O3 layers were deposited on LaNiO3(110)∕Pt∕Ti∕SiO2∕Si substrates by rf magnetron sputtering. All films comprise five periodicities, the layer thicknesses of rhombohedral (dR) and tetragonal (dT) phases in one periodicity are varied.…
Magnetism can be induced in polymers by embedding thiol-capped Au nanoparticles (NPs). The capped NPs (see figure) induce an alteration in the electronic properties of Au, giving rise to ferromagnetic behavior despite the diamagnetic character of bulk Au. When the capped NPs are embedded into a polymeric matrix the ma…
Bowled over: Calix[3]dipyrrins were synthesized from pyrrole and aryl aldehyde precursors by the Lindsey protocol, modified by the presence of a small amount of water. These bowl-shaped macrocycles can accommodate three metal (M) ions such as NiII and CuII in a hexagonal M3O3 manner (see structure; Cu green, N blue, O…
The authors demonstrate a compact system for the detection of the peak wavelength value emitted by a light source. The system is composed of only two components, a graded-wavelength guided-mode resonance filter placed before a charge-coupled device sensor array. The filter provides a spatially resolved transmission mi…
The elastic stability of five hexagonal boron nitride (h-BN) stacking sequences is investigated with density functional theory. All components of the elasticity tensor are computed and used to evaluate the Born stability criteria. Phonon spectra are computed for one elastically stable and one elastically unstable h-BN…
The 1∕f noise in carbon nanotube random network films has been experimentally and theoretically investigated. The authors have established that the percolation process is the primary physical mechanism influencing the noise level in such films. Using percolation theory, the authors give an expression for the 1∕f noise…
A one-step procedure to assemble nanoscale electrospun poly(methylmetacrylate) (PMMA) and multiwall carbon nanotube (MWCNT) reinforced PMMA fibers into twisted continuous ropes is presented. A post-treatment procedure following rope assembly is essential to maximize the mechanical properties of the ropes. A comparison…
Electrical transport of Bi–ZnO nanowires shows n-type semiconducting behavior with a carrier concentration of ∼3.5×108cm−1 (2.7×1019cm−3) and an electron mobility of 1.5cm2∕Vs. The carrier concentration is one order of magnitude larger than that of undoped ZnO nanowires, indicating that Bi acts as donor rather than th…
Red, blue, and green: A red NiIIAuI complex with a low-spin square-planar NiN2S2 configuration can be converted into a green high-spin octahedral NiO3S3 complex by lowering the pH (see scheme; pH change: red arrows). Increasing the Ni/Au ratio (Ni/Au change: blue arrows) gives a light blue octahedral NiN2O2S2 complex;…
Abstract Poly( L ‐lactide)‐ block ‐poly(ethylene glycol)‐ block ‐poly( L ‐lactide) (PLLA‐PEG‐PLLA) triblock copolymers were synthesized effectively by poly(ethylene glycol) initiated ring‐opening polymerization (ROP) of L ‐lactide under microwave irradiation. The products were characterized by 1 H NMR, GPC, and DSC. T…
Abstract This paper describes how gradient hardening can, in a thermodynamically consistent fashion, be included into a crystal plasticity model. By assuming that the inelastic part of the free energy includes contributions from the gradient of hardening along each slip direction, a hardening stress due to the second…
Dual-band negative-index metamaterial designs in the near-infrared frequency range are presented and their performance is analyzed using a full-wave numerical electromagnetic scattering method. Negative effective permittivity is provided by a thin layer of metallic film. Negative effective permeabilities are supplied…
We report a structure with 4 thin film layers composed of pure metal and dielectric materials and prepared by sputtering. The reflectance and transmittance are lower than 5% with the absorption to be achieved higher than 95% in the 400-1000nm wavelength region as match to the solar radiance spectrum. The thermal emitt…
Micropatterned growth of ZnO nanorod arrays on silicon substrates using a low temperature aqueous method is demonstrated. ZnO nanocrystals were used as seeds for producing well-aligned, wurtzite ZnO nanorod arrays with spin coating. The shape of the ZnO nanorods was sensitive to the orientation of substrate as well as…
Mn-doped ZnO nanorods are prepared by a chemical vapor deposition method using zinc and MnO2 powders as source materials of Zn and Mn, respectively. Cathodoluminescence (CL) characterization indicates that the Mn-doped ZnO nanorods grown at different growth temperatures have different oxygen vacancy concentrations. Ro…