Materials Literature
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Abstract In casting heavy ingots of high‐chromium high‐carbon cold work steels, macrosegregation develops in the center of the ingot, causing difficulties during subsequent hot working. Heat transfer and solidification of an industrial scale high‐carbon high‐chromium steel ingot was simulated and thereafter a laborato…
Abstract A study on the efficiency of natural antioxidants from agri‐food industry wastes as long‐term antioxidants for polypropylene (PP) is reported. Special attention is paid to the usage of vegetal wastes as a source of natural antioxidants such as alternatives to synthetic long‐term antioxidants. The potential of…
Abstract This is a comparison study of the effects of various colloids on polydimethylsiloxane (PDMS) nanocomposites. Mica of layered structure and silica of nanospherical shape were both used with different content. Silane coupling agent was used for surface modification of mica to improve its dispersion. Wide X‐ray…
We have investigated the diameter-selective separation of carbon nanotubes by one-pass gel chromatography with a gradient of surfactant concentration. The formation of surfactant gradient in a column was successfully measured and is explained by a simple diffusion process even in the gel. We found that the diameter of…
The method of optical conformal mapping is used to design two isotropic devices through which light travels in a unidirectional manner. The first device is a directional emitter. By setting a line current source in a properly tuned refractive index profile, fields can be radiated in only one direction or its opposite…
We report on the strong interaction between graphene and intercalated cobalt revealed by scanning tunneling spectroscopy (STS). A significant difference between pristine graphene and Co-intercalated graphene is identified at high bias voltages in the regime of field emission. For MLg/Co/Pt a resonance is observed at 3…
There is a great deal of interest in finding new synthetic routes to prepare nano-crystallites. This paper reports in situ preparation of CdSe nanoparticles using poly (vinyl alcohol) [PVA] as matrix by using chemical route. XRD analysis revealed that CdSe-PVA nano- composite with a small size and narrow size distribu…
Abstract A novel method for producing graphene/hydroxypropyl cellulose (HPC) composite with a fine dispersion of graphene is established. The thermoresponsive HPC, with low a critical solution temperature (LCST) behavior, becomes self‐associated into nanospheres when its homogeneous solution is heated to a temperature…
Zinc oxide thin films were grown on quartz substrates by RF magnetron sputtering technique in an Argon atmosphere with sputtering power of 50W and sputtering pressure of 2x10-2 Torr and studied the effect of annealing on the structural and optical properties. Crystalline properties of ZnO films as a function of anneal…
SUMMARY A computational model for micropolar hyperelastic‐based finite elastoplasticity that incorporates isotropic hardening is developed. The basic concepts of the non‐linear micropolar kinematic framework are reviewed, and a thermodynamically consistent constitutive model that features Neo‐Hooke‐type elasticity and…
We report specific heat capacity measurements on a LiFeAs single crystal at temperatures down to 400 mK and magnetic fields up to 9 T. A small specific heat jump at ${T}_{c}$ and finite residual density of states at $T=0$ K in the superconducting (SC) state indicate that there are strong unitary scatterers that lead t…
Abstract Preceramic foams with a variety of profiles and morphologies were fabricated by a continuous foam extrusion process based on a single‐screw extruder. A methyl silicone resin was used as the preceramic polymer and carbon dioxide as the foaming agent. Variations of the foam morphology were achieved by changing…
In this work, the controlled fabrication of highly ordered ZnO nanowire (NW) arrays on silicon substrates is reported. Si NWs fabricated by a combination of phase shift lithography and etching are used as a template and are subsequently substituted by ZnO NWs with a dry-etching technique and atomic layer deposition. T…
Vertically aligned ZnO nanowires have been synthesized by a hydrothermal method. After being irradiated by a short laser pulse, the tips of the as-synthesized ZnO nanowires can be tailored into a spherical shape. Transmission electron microscopy revealed that the spherical tip is a single-crystalline piece connected t…
We have measured the temperature dependence of the absolute value of the magnetic penetration depth $\ensuremath{\lambda}(T)$ in a Ca${}_{10}$(Pt${}_{3}$As${}_{8}$)[(Fe${}_{1\ensuremath{-}x}$Pt${}_{x}$)${}_{2}$As${}_{2}$]${}_{5}$ ($x=0.097$) single crystal using a low-temperature magnetic force microscope (MFM). We ob…
Lead zirconate titanate ( PZT ) is one of the most commonly used piezoelectric ceramics. The major causes of its electrical fatigue are suggested to be domain pinning and cracking. However, their contributions to fatigue have never been quantitatively compared. This study focuses on the electrical fatigue‐induced micr…
New unconventional T-shaped non-symmetrical dimeric liquid crystalline compounds have been synthesised and their thermotropic properties studied on the hot-stage of a polarising microscope. These compounds consist of an azo-ester mesogenic unit with a range of terminal substituents (–CH3, –OCH3, –NO2 or –Cl) at one en…
Fluorescent α,α'-diamide substituted bi- and terthiophene derivatives were prepared by Stille and Suzuki couplings. Their one-pot deprotection and coupling with 2-thiophene carboxaldehyde led to stable conjugated azomethines. These exhibited electrochromic properties, and they were used to fabricate a working electroc…
Abstract The secondary antioxidants Irganox 168 and 242 and dilaurylthiodipropionate (didodecyl‐3,3′‐thiodipropionate) (DLTP) were chosen to be combined with the primary phenol antioxidants Irganox 300, 1010, 1035, and 1076, and the effects of the binary combined systems of antioxidants on the peroxide curing reaction…
A model for two-dimensional colloids confined laterally by "structured boundaries" (i.e., ones that impose a periodicity along the slit) is studied by Monte Carlo simulations. When the distance D between the confining walls is reduced at constant particle number from an initial value D(0), for which a crystalline stru…