Materials Literature
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In recent years there have been reports of anomalous electrical resistivity and the presence of superconductivity in semiconducting InN layers. By a careful correlation of the temperature dependence of resistivity and magnetic susceptibility with structural information from highresolution x-ray diffraction measurement…
Pressure-induced phase transitions of spin-crossover materials are studied in a microscopic model taking into account the elastic interaction among distortions of lattice due to the difference of the molecular sizes between the high-spin state and the low-spin state. We perform Monte Carlo simulations in the constant…
We report the observation of channel-width dependent enhancement in nanoscale field effect transistors containing lithographically-patterned silicon nanowires as the conduction channel. These devices behave as conventional metal-oxide-semiconductor field-effect transistors in reverse source drain bias. Reduction of na…
Pinning interaction between a screw dislocation and a void in fcc copper is investigated by means of molecular dynamics simulation. A screw dislocation bows out to undergo depinning on the original glide plane at low temperatures, where the behavior of the depinning stress is consistent with that obtained by a continu…
Abstract The use of multi‐walled carbon nanotubes (MWCNT) as reinforcing material for thermoplastic polymer matrices, polymethyl methacrylate (PMMA), and polystyrene (PS) has been studied. MWCNT were synthesized by chemical vapor deposition (CVD) technique using ferrocene‐toluene mixture. As‐prepared nanotubes were ul…
Biostable polyurethanes (PURs) have been incorporated in biomedical devices since the 1960s. The mechanisms of degradation and compositions with improved in vivo biostability have been investigated extensively. In recent years, biodegradable PURs have been investigated for applications in regenerative medicine. In con…
We introduce a simple one-step method to synthesize MnO 2 /poly(3,4-ethylenedioxythiophene) (PEDOT) coaxial nanowires by coelectrodeposition in a porous alumina template. Constant potential (typically 0.75 V vs Ag/AgCl) is applied on the bottom electrodes in the pores of the alumina template in aqueous solution contai…
Feasibility of density functional theory (DFT) to predict dielectric properties such as polarizability of saturated polymers is investigated. Small saturated molecules, methane and propane, which is a monomer of polypropylene chain, are used in testing the methods. Results for polarizabilities based on several density…
Abstract This study aims at analysing the tribochemical mechanisms of lubrication during the process of form tapping and consequently optimising the formulation of the lubricant. In order to correlate the tribochemical reactions with the performance of a lubricant, we measure the alteration of the tapping torque accor…
The spectroscopic properties of Ce 3+ activated YBa 3 B 9 O 18 , prepared by a solid-state reaction technique at high temperature, were investigated in the vacuum ultraviolet–ultraviolet range. Though Y–O polyhedra were characterized with regular octahedra in the host YBa 3 B 9 O 18 , five 5d absorption bands were obs…
Multiwalled carbon nanotubes (MWCNTs) were grafted by chitosan (CS); the product could disperse well in poly(vinyl alcohol) (PVA) aqueous solution with 2% (v/v) acetic acid solution. Because this product has potential in several biological fields, it was electrospun so as to enlarge the surface area. Raman spectra ind…
Abstract Changes in the amount of the rigid, semi‐rigid and soft fractions, molecular mobility and domain thickness of uniaxially stretched iPP were investigated as a function of temperature, draw ratio, drawing temperature and drawing rate. Correlations are established between the thicknesses of rigid domains and the…
In this study, the EGSnrc (Electron Gamma Shower) Monte Carlo radiation transport code is used to simulate the energy spectra and the angular distributions of charged particles backscattered from solid targets. The study covers the energy range 10–70 keV, which is of interest to applied physics fields such as scanning…
Amphiphilic glycopolymers, polylactide-grafted dextran copolymers (Dex-g-PLA), were synthesized with a well-controlled architecture obtained through a three-step procedure: partial silylation of the dextran hydroxyl groups, ring-opening polymerization of D,L-lactide initiated from remaining hydroxyl groups, silylether…
Effects of Co content on the magnetic properties and microstructure of melt-spun [(Fe1−xCox)0.675Pt0.325]84B16 (x=0–0.5) and [(Fe1−yCoy)0.725Pt0.275]85B15 (y=0 and 0.3) nanocomposite ribbons have been investigated. The substitution of Co for Fe in [(Fe1−xCox)0.675Pt0.325]84B16 ribbons enhances the coercivity (Hci) fro…
The self-assembly of nanoparticle–copolymer films confined between two polymer-grafted surfaces is studied by using self-consistent field and density functional theories. With increasing particle concentration, the film undergoes a series of transitions including hexagonal, lamellar, hexagonal-lamellar, double-core he…
Abstract Two series of peripherally functionalised dendrimers were synthesised based on poly(ethyleneimine) and poly(amidoamine) (PAMAM) dendrimers by reaction of ( R )‐6‐ N ‐[(γ‐carboxyl)butanoyl]‐aminomethyl‐2,2′‐bis(diphenylphosphino)‐1,1′‐binaphthyl (“Glutaroyl‐Aminap”) with first to fifth generation PPI and zerot…
Nonsymmetrical coordination favored: The structure of BeB2C2 (see picture; Be white, B dark gray, C light gray) has been solved using near-edge fine-structure analysis of electron energy loss spectra and high-resolution powder diffractometry. It exhibits the unusual features of graphite-analogous B/C layers and a nons…
Abstract One of the main challenges in the ongoing development of thin film crystalline silicon solar cells on a supporting silicon substrate is the implementation of a long‐wavelength reflector at the interface between the epitaxial layer and the substrate. IMEC has developed such a reflector based on electrochemical…
Two routes for the de novo biosynthesis of pyridoxal-5'-phosphate (PLP) have been discovered and reconstituted in vitro. The most common pathway that organisms use is dependent upon the activity of just two enzymes, known as Pdx1 (YaaD) and Pdx2 (YaaE) in bacteria. Pdx2 has been shown to have glutaminase activity and…