Materials Literature
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Although ZrB2 has some excellent performances, it is difficult to prepare the high relative-density ZrB2 ceramics, which limits the application of ZrB2 materials. To obtain higher relative-density ZrB2 ceramics for increasing the good oxidation resistance, YAG/ZrB2 multiphase ceramics is prepared with the spark plasma…
We present an improved version of the Jiles-Atherton model for least square identification. We first use a simplified anhysteretic magnetization model to provide simple estimates of the initial parameters. Then we perform a normalization of sensitivity functions to improve the convergence of the Levenberg-Marquardt al…
We report on electroluminescent P-I-N diodes containing silicon nanocrystals embedded in an amorphous silicon carbon matrix as emitting material. The as-deposited devices mostly contain amorphous Si nanoparticles and emit weakly in the IR. After a forming process consisting of the application of a high current density…
Abstract In this study, poly(ethylene terephthalate) (PET)/attapulgite (AT) nanocomposites were prepared through the in situ polymerization of terephthalic acid, ethylene glycol, and AT, which was not premodified. By means of this new method, PET chains were successfully grafted onto the surface of AT, and this was co…
Selective deposition of nano-β-SiC on non-{100} diamond faces has been observed in a microwave plasma chemical vapor deposition process due to the presence of Si(CH3)4 in the gas phase. The process allows only the growth of diamond starting crystals whose [001] is normal to the film surface and interrupts the growth o…
We have measured the electrical resistivity, heat capacity, and thermal conductivity of (La1−xNdx)0.7Pb0.3MnO3 single crystals. While the increase in x results in the change in crystal symmetry, reduction in the Curie temperature TC, and large enhancement of magnetoresistance, the magnitude of the dip in thermal cond…
The revival of multiferroics is motivated by their exciting physics and their ability to bring novel functionalities to a number of technological fields such as spintronics. The lack of room temperature ferroelectric ferromagnets is a problem and has driven most of the attention thus far to BiFeO$_3$, a ferroelectric…
Abstract In nanoporous alumina, surface pre‐treatment, prior to the anodization process, plays a crucial role in the pore structure formation and organization. In this work we employ different pre‐treatments to determine the best suited for the subsequent anodization process. We observed significative differences in t…
One of the two crystal structures of the arm-dimerization domain determined in the absence of arbinose fails to show the arm, whereas the other structure does show it. The two structures lead to different pictures for the regulatory behavior of the arms. Trypsin digestion, fluorescence anisotropy, and NMR experiments…
Orthogonal alignment patterns of 2×2μm2 size that induce nematic bistability were fabricated over 4×4cm2 by a double exposure process employing a rewritable photoalignment material. Bistable liquid crystal cells with patterned surfaces were fabricated, and reproducible switching between the bistable states driven by o…
We have fabricated carbon nanotube (CNT) field-effect transistors (FETs) by direct growth of single-wall CNTs between the source and drain electrodes, and investigated their device characteristics. The FETs show ambipolar operation. The temperature and bias voltage dependence of device characteristics are consistent w…
CdSe nanocrystals (NCs) have been decorated on single-walled carbon nanotubes (SWCNTs) by combining a method of chemically modified substrate along with gate-bias control. CdSe∕ZnS core/shell quantum dots were negatively charged by adding mercaptoacetic acid. The silicon oxide substrate was decorated by octadecyltrich…
Powders of K0.5Na0.5NbO3 (KNN) were prepared by the Polymerized Complex Method (PC method), based on the Pechini-type reaction route. The crystallization process of KNN during the calcination of an amorphous precursor was observed, using TG-DSC analysis and X-ray powder diffraction. After calcination the powders were…
Low-temperature suppression of nonlinear losses leads to improvement in nanosecond lasing threshold of self-assembled oligophenyl nanofibers by two orders of magnitude. Laser dynamics is revealed by time-resolved photoluminescence excited by femtosecond and nanosecond pulses. Strategies are discussed to extend low-thr…
We investigated the bias polarity dependence of the characteristics of a phase change memory device and found that the device showed higher resistance both at programed and erased states, extended erasing time, and higher threshold voltage (Vth) under negative bias than those under the conventional positive bias. Taki…
Spin-on pure-silica-zeolite or Silicalite films are currently considered as outstanding low-k materials because of their stiffness and ultralow dielectric constant. It is shown that spin-on Silicalite films with low k values unavoidably contain cavities tens of nanometers wide, representing a considerable challenge in…
Abstract In this paper, we report the electrochemical formation of the InP porous nanostructures and their feasibility for the application to the amperometric chemical sensors. Our two step electrochemical process consists of the pore formation on a (001) n‐type InP substrate and the subsequent etching of pore walls c…
This paper demonstrates the effectiveness of polyphosphazene elastomer as compatibilizer on the properties of Nylon 6,6/thermotropic liquid crystalline polymer blends. In situ fibrillation of thermotropic liquid crystalline polymers develops in the shear flow field in presence of thermoplastic matrix. The addition of…
We have measured the dynamic structure factor, $S(Q,E)$, of liquid Se at 523 and 773 K, at the momentum $Q$ and energy $E$ transfer, from 1.9 to $42\text{ }{\text{nm}}^{\ensuremath{-}1}$, and over $\ifmmode\pm\else\textpm\fi{}40\text{ }\text{meV}$, respectively, using a high-resolution inelastic x-ray scattering techn…
The optical characteristics of a silver layer deposited on an antireflection subwavelength-structured surface are investigated. The experimental results of the reflectance and the transmittance of several different thicknesses of silver layer on the subwavelength-structured surface are carried out. A subwavelength str…